Cooling Fan Bearing Fault Identification Using Vibration Measurement
|
|
- Lewis Chapman
- 6 years ago
- Views:
Transcription
1 Cooling Fan Bearing Fault Identification Uing Vibration Meaurement Qiang Miao * School of Mechanical, Electronic and Indutrial Engineering Univerity of Electronic Science and Technology of China Chengdu, Sichuan 673, China mqiang@uetc.edu.cn Michael Azarian, Michael Pecht Center for Advanced Life Cycle Engineering (CALCE) Univerity of Maryland College Park, MD 74, USA mazarian@calce.umd.edu pecht@calce.umd.edu Abtract A a commonly ued aembly in computer cooling ytem, the normal operation of a cooling fan i critical for guaranteeing ytem tability and reducing damage to electronic component. Reliability analye have hown that fan bearing failure i a maor failure mode. Therefore, it i neceary to conduct reearch on fault detection of cooling fan bearing. In thi paper we propoe vibration-baed fan bearing fault detection through the wavelet tranform and the Hilbert tranform. An experiment on fan bearing wa conducted to collect vibration data for the validation of our propoed method. The analyi reult how that the propoed method can identify different bearing fault. Keyword cooling fan bearing; fault identification; dicrete wavelet tranform; Hilbert tranform I. INTRODUCTION Nowaday, computer are ued in many different area, uch a telecommunication, education, manufacturing, marketing, health care, etc. Computer ytem failure may bring inconvenience in our daily live, or even caue evere economic loe and catatrophic accident under certain condition. The requirement of high operational reliability ha driven the reearch on diagnoi and failure analyi of computer ytem. However, it ha been a challenging tak due to the complicated interaction of ytem performance parameter and application environment (e.g., temperature, moiture, and vibration) and their effect on ytem degradation and failure []. A a commonly ued aembly in a computer cooling ytem, the mechanical part of a cooling fan include bearing, haft, fan blade, and fan houing. A fan i ued to move heated air away from the component in the cae. According to [], fan failure i a maor problem for many electronic ytem. Bearing failure i the top contributor to fan failure. The normal operation of a cooling fan impact a computer ytem by preventing intability, malfunction, and damage to electronic component caued by overheating. Therefore, it i neceary to conduct reearch on cooling fan bearing fault detection o a to guarantee the normal operation of a fan. The maor type of bearing ued in cooling fan i ball bearing, mainly becaue it ha a longer lifepan at higher temperature (63, hour at o C) compared to leeve bearing (4, hour at o C) [3]. Ball bearing are the fundamental rotating part in mechanical ytem, and much reearch ha been conducted in bearing fault diagnoi [4-8]. However, the literature on computer cooling fan bearing reliability i very limited [, 9, ]. It i a challenge to identify ball bearing fault ignature baed on vibration ignal becaue the bearing component, including inner race, outer race, cage, and roller, complicate the bearing vibration ignal. When a local fault exit in a ball bearing, the urface i locally affected and the vibration ignal exhibit modulation []. Therefore, it i neceary to implement filtering and demodulation o a to obtain faultenitive feature from the raw ignal. At preent, the Hilbert tranform ha been widely ued a a demodulation method in vibration-baed fault diagnoi [, 3]. It ha a quick algorithm and can extract the envelope of the vibration ignal. In addition, the wavelet analyi i able to decompoe a ignal into different cale correponding to different frequency bandwidth [, 4, ], which can be treated a band-pa filter. The purpoe of thi tudy wa to invetigate fan bearing fault identification method uing vibration meaurement that can be ued for cooling fan degradation aement and prognotic. A tet rig with a cooling fan wa etablihed, with no lubricant in the ball bearing o a to accelerate the experiment. To identify the type of bearing failure from the vibration meaurement at the end of experiment, a new method wa propoed baed on the wavelet and the Hilbert tranform. Thi paper i organized a follow. In Section, a brief introduction to the wavelet and Hilbert tranform i given. Section 3 preent our propoed method for fan bearing fault identification uing the vibration ignal. A cae tudy on fan bearing i preented in Section 4, including a decription of the experiment and validation of the propoed method. Our concluion are ummarized in Section. II. THEORETICAL BACKGROUND A. Wavelet Tranform The wavelet tranform i the time-frequency decompoition of a ignal into a et of wavelet bai function. It poee flexibility in both the time and frequency domain, and it ha * Correponding author. mqiang@uetc.edu.cn. Phone: //$6. IEEE
2 been widely ued in machinery fault diagnoi. The continuou wavelet tranform (CWT) of a finite energy time domain ignal x ( with the wavelet ψ ( i defined a [4]: + t b W ( a, = ψ ( ) dt () a a where denote the complex conugation, a R ; b R ; and a and b are the cale and tranlation parameter, repectively. A een in (), the wavelet coefficient W ( a, i defined on the a b plane. A mall cale parameter a correpond to a high-frequency component, and the tranlation parameter b repreent the location of the wavelet bai in the time domain. W ( a, i a meaure of imilarity between the ignal x ( and the wavelet ψ ( at different frequencie determined by the cale parameter a and different time location determined by the tranlation parameter b. Although the CWT offer the poibility of a detailed analyi of tranient with an arbitrary fine frequency cale, it i not computationally efficient and it reult in high redundancy. The dicrete wavelet tranform (DWT) i derived from the CWT through dicretization of the wavelet, and the mot common dicretization of the wavelet i baed on a power of (i.e., dyadic cale and poition [6]). That i, a =, b = k,, k Z () Therefore, the dicrete wavelet function and caling function can be defined a follow:, k k ψ ( = ψ ( t ) (3), k k φ ( = φ( t ) (4) Mallat [6] propoed a fat wavelet decompoition and recontruction method, which i a claical ignal proceing cheme, known a a two-channel ub-band coding. In the decompoition proce, the ignal i convolved with a low-pa filter and a high-pa filter, repectively. It produce two piece of decompoed ignal, namely, the approximation ignal and the detail ignal. For example, let x ( t ) = A ( t ) ; the decompoition proce can be repeated a follow: A ( = A ( + D ( () where A ( and D ( are the approximation ignal and detail ignal at the th decompoition level, repectively. In recontruction, a pair of low-pa and high-pa recontruction filter are convolved with A ( and (, repectively. The decompoition of a ignal uing dyadic orthogonal wavelet i a quadratic ub-band filtering. Suppoe a ignal i collected at a ampling frequency F. The information obtained by DWT on each cale correpond to a frequency bandwidth F +. The frequency band of the approximation A i expreed a f [, A F And the frequency band of the detail D + ] D i + (6) f D + [ F, F ] (7) Thi mean that the approximation and detail are the narrowbanded ub-ignal of the original ignal. B. Hilbert Tranform From a ignal proceing perpective, the Hilbert tranform can be interpreted a a filtering operation in which the amplitude of the frequency component i unchanged, while the phae i hifted by 9 o. It i a time-domain convolution that map one real-valued time-hitory into another. Given a time domain ignal x (, it Hilbert tranform H [ i defined a: + τ ) H[ = dτ (8) π t τ where t and τ are the time and tranlation parameter, repectively. In machinery fault detection, modulation caued by local fault i inevitable in collected ignal. In order to identify fault-related ignature, demodulation i a neceary tep, and it can be accomplihed by forming a complex-valued timedomain analytic ignal A [ with x ( and H [. That i, iϕ( A[ = + ih[ = a( e (9) H[ where a ( = x ( + H [, ϕ ( t ) = arctan, and i = ; a ( i the envelope of A [, which repreent an etimate of the modulation in the ignal. III. THE PROPOSED METHOD FOR FAN BEARING FAULT IDENTIFICATION A. Fan Bearing Failure Behavior The cooling fan bearing tudied in thi paper are typical of thoe ued in many computer. Therefore, it i neceary to undertand it failure behavior in order to conduct reearch on fan bearing fault detection. Typical failure of ball bearing include local fault on the inner race, outer race, cage, and roller. If there i a local fault on a certain part of a ball bearing, the correponding fault-related characteritic frequency and it harmonic can be identified through pectral analyi in the frequency domain [7]. The formulae for the variou characteritic frequencie are a follow: Ball pin frequency (BSF): D d BSF = = [ ( co β ) ] () d D Ball pa frequency, inner race (BPFI): n d BPFI = I = ( + co β ) () D Ball pa frequency, outer race (BPFO): n d BPFO = O = ( co β ) () D Fundamental train frequency (FTF): d FTF = C = ( co β ) (3) D
3 Here, i the rotating peed of the bearing haft (Hz), n i the number oolling element, d i the mean diameter of the rolling element (mm), D i the pitch diameter of the bearing (mm), and β i the contact angle ( o ). B. The Propoed Method The function of fan bearing i to reduce friction and allow a fan to operate at high peed with lower noie. In cae where noie can be heard, eriou fault may have developed on different part of the bearing, complicating the vibration meaurement. In addition, fan bearing ued in computer cooling fan are mall ( 8 mm in pitch diameter), which make it almot impoible to place everal enor on different poition around the bearing for data collection. The DWT i a quadratic ub-band filtering technique that can decompoe the original ignal into different band, and the Hilbert tranform provide a mean of ignal demodulation. Therefore, thee two technique are ued in fan bearing vibration analyi for the identification of fault. A flow chart of the fan bearing fault identification method baed on the wavelet and the Hilbert tranform i hown in Fig.. Hilbert tranform. To identify the exitence of characteritic frequency component (uch a BSF, BPFI, BPFO, FTF) of the bearing, perform the pectrum analyi of a ( by + πfti ES ( f ) = a ( e dt () Here, ES ( f ) denote the abolute value of the Fourier tranform amplitude of the th envelope a (. IV. CASE STUDY A. Decription of Experiment The normal lifepan of a cooling fan can be everal year, and it i unrealitic to conduct an experiment for uch a long time. For a bearing to have it nominal lifepan at it nominal maximum load, lubrication ha a critical impact on the lifepan of the bearing. Therefore, it i reaonable to accelerate the fan bearing experiment through the reduction of the lubrication level. Auming that the nominal amount of lubricant i at the % level, then a certain lubrication level p% decribe the percentage of lubricant being added in the bearing. In thi tudy, an experiment wa conducted to validate the propoed method for fan bearing fault identification. To accelerate the experiment, the lubrication level wa %, which mean that no lubricant wa in the bearing. Figure how the cooling fan with bearing teted in thi experiment. Figure. Flow chart of the propoed method. Given a piece of ignal x (, a pre-proceing tep i neceary to reduce the trend and the DC component in the ignal. That i, x y( = (4) σ where y ( i the pre-proceed ignal, x i the mean value of x (, and σ i the tandard deviation of x (. In order to obtain ub-ignal correponding to different frequency band, the DWT with the Daubechie wavelet i utilized, and the decompoition level i J. Therefore, a erie of detail ignal D ( with =,,..., J can be obtained, and the frequency range of D ( i decribed in (7). When a local fault exit in the bearing, there i modulation in the ignal. To reduce the impact of modulation, the Hilbert tranform wa performed on all of the detail ignal uing (8) and (9), and the correponding analytical ignal and their envelope, a ( ( =,,..., J ), can be obtained. Here, a ( i the envelope ignal of the th detail ignal D ( after the Figure. The cooling fan with bearing being teted in thi experiment. The pecification of the fan bearing in our experiment are given in Table. The cooling fan ued in thi experiment wa in it brand new tate with ungreaed ball bearing before the experiment. At the beginning, the vibration ignal of the fan wa collected at a ampling frequency of.4 khz with - econd period under an ambient environment. The fan peed wa 4, rpm. After that, the cooling fan wa treed in a chamber at a high temperature (7 o C). After 7 hour of running at it maximum peed of 48 rpm, the vibration ignal of the fan wa collected at a ampling frequency of.4 khz with -econd period under an ambient environment. The fan peed wa 4, rpm. Therefore, the rotation peed of the bearing during data collection wa = Hz. Uing () (3), the variou fault characteritic frequencie were determined, a lited in Table.
4 TABLE I. FAN BEARING SPECIFICATIONS Number oolling element n 6 Diameter oolling element d Pitch diameter of bearing D Contact angle β TABLE II..9 mm.mm.4 o CHARACTERISTIC FREQUENCIES OF FAN BEARING Ball pin frequency ( ).96 Hz Ball pa frequency, inner race ( I ) 6.87 Hz Ball pa frequency, outer race ( O ) 43.3 Hz Fundamental train frequency ( C ) 3.8 Hz B. Experimental Reult To validate the propoed method, the vibration ignal collected before and after the 7-hour treing experiment were ued to conduct the following analyi. The Daubechie wavelet db wa ued for ignal decompoition; the decompoition level wa J =6. The Hilbert tranform wa applied to demodulate the detail D ( with =,,..., 6. x - ()Spectral of D ignal x -6 ()Spectral of D ignal x -6 (3)Spectral of D3 ignal 3 8 Figure 3. Analyi reult of the fan bearing before the treing experiment x -6 ()Spectral of D ignal x - (4)Spectral of D4 ignal x -4 (6)Spectral of D6 ignal 3 8 The analyi reult of the fan bearing before the treing experiment are hown in Fig. 3. Since the ball bearing wa in a brand new tate at the beginning, no fault-related frequency component were found from the pectra of the detail ignal. Fig. 4 how the analyi reult of the fan bearing after the 7-hour treing experiment. From the pectra of detail ignal D (,..., D6 (, many fault-related characteritic frequencie and their harmonic were identified, which indicated that there were everal local fault at different part of the fan bearing. In fact, noie coming from the fan wa heard at the end of the experiment. C x -3 3 C. ()Spectral of D ignal x -4 ()Spectral of D ignal x -4 (3)Spectral of D3 ignal x -4 Figure 4. Analyi reult of the fan bearing after 7-hour treing experiment. V. CONCLUSIONS Cooling fan bearing failure i a maor failure mode in computer cooling ytem. Cooling fan bearing failure can reult in ytem intability, malfunction, and damage to the computer ytem. In thi paper, a fan bearing fault identification method baed on the dicrete wavelet tranform and the Hilbert tranform i propoed. In order to validate the propoed method, an experiment with ungreaed fan bearing wa conducted to obtain the vibration ignal before and after failure. The analyi reult howed that the propoed method O O (4)Spectral of D4 ignal x -4 ()Spectral of D ignal x -3 (6)Spectral of D6 ignal. 4 fro 3
5 can identify the fault-related characteritic frequencie of the fan bearing. The work decribed in thi paper provide a promiing way to etablih potential metric for the decription of bearing health degradation. Therefore, it i deirable to develop a condition monitoring ytem baed on the propoed method and realize on-line health evaluation of cooling fan. With uch a function, the critical failure of cooling ytem can be avoided, and the reliability and availability of electronic ytem can be guaranteed. ACKNOWLEDGMENT Thi reearch wa partially upported by National Natural Science Foundation of China (Grant No. 98), Fundamental Reearch Fund for the Central Univeritie (Grant No. ZYGX9X). We would like to thank Mr. Hyuneok Oh at CALCE PHM Group, Univerity of Maryland, for hi work on the experiment and dicuion on the improvement of thi reearch. REFERENCES [] M. Pecht, Prognotic and Health Management of Electronic. London: Wiley-Intercience, 8. [] X. Tian, Cooling fan reliability: failure criteria, accelerated life teting, modeling and qualification, Proceeding of 6 Reliability and Maintainability Sympoium, 6, pp [3] M. William, Ball v. leeve: a comparion in bearing performance, Technical Paper from NMB Technologie Corp. [4] N. Tandon, and A. Choudhury, A review of vibration and acoutic meaurement method for the detection of defect in rolling element bearing, Tribology International, Vol.3, No.8, 999, pp [] W. He, Z.N. Jiang, and K. Feng, Bearing fault detection baed on optimal wavelet filter and pare code hrinkage, Meaurement, Vol.4, No.7, 9,pp. 9-. [6] V.K. Rai, and A.R. Mohanty, Bearing fault diagnoi uing FFT of intrinic mode function in Hilbert-Huang tranform, Mechanical Sytem and Signal Proceing, Vol., No.6, 7, pp [7] H. Qiu, J. Lee, J. Lin, and G. Yu, Wavelet filter-baed weak ignature detection method and it application on rolling element bearing prognotic, Journal of Sound and Vibration, Vol.89, No.4-, 6, pp [8] R.B. Randall, and J. Antoni, Rolling element bearing diagnotic A tutorial, Mechanical Sytem and Signal Proceing, Vol., No.,, pp [9] H. Oh, M. H. Azarian, M. Pecht, C. H. White, R. C. Sohaney, and E. Rhem, Phyic-of-failure approach for fan PHM in electronic application, Proceeding of the IEEE Prognotic and Sytem Health Management Conference,, pp. -6. [] H. Oh, T. Shibutani, and M. Pecht, Precuror monitoring approach for reliability aement of cooling fan, Journal of Intelligent Manufacturing, 9, DOI.7/ [] J. Antoni, and R.B. Randall, Differential diagnoi of gear and bearing fault, Journal of Vibration and Acoutic, Vol.4, No.,, pp [] D. Wang, Q. Miao, X. Fan, and H.Z. Huang, Rolling element bearing fault detection uing an improved combination of Hilbert and Wavelet tranform. Journal of Mechanical Science and Technology, Vol.3, No., 9, pp [3] Y. Qin, S. Qin, and Y. Mao, Reearch on iterated Hilbert tranform and it application in mechanical fault diagnoi, Mechanical Sytem and Signal Proceing, Vol., No.8, 8, pp [4] D. Wang, Q. Miao, and R. Kang, Robut health evaluation of gearbox ubect to tooth failure with wavelet decompoition, Journal of Sound and Vibration, Vol.34, No.3-, 9, pp [] G. Niu, A. Widodo, J.D. Son, B.S. Yang, D.H. Hwang, and D.S. Kang, Deciion-level fuion baed on wavelet decompoition for induction motor fault diagnoi uing tranient current ignal, Expert Sytem with Application, Vol.3, No.3, 8, pp [6] S.G. Mallat, A theory for multireolution ignal decompoition: the wavelet repreentation, IEEE Tranaction on Pattern Analyi and Machine Intelligence, Vol., No.7, 989, pp [7] Q. Miao, D. Wang, and H.Z. Huang, Identification of characteritic component in frequency domain from ignal ingularitie, Review of Scientific Intrument, Vol.8, No.3,, 33.
Basic Study of Radial Distributions of Electromagnetic Vibration and Noise in Three-Phase Squirrel-Cage Induction Motor under Load Conditions
http://dx.doi.org/0.42/jicem.203.2.2.54 54 Journal of International Conference on Electrical Machine and Sytem Vol. 2, No. 2, pp. 54 ~58, 203 Baic Study of Radial Ditribution of Electromagnetic Vibration
More informationFrequency Calibration of A/D Converter in Software GPS Receivers
Frequency Calibration of A/D Converter in Software GPS Receiver L. L. Liou, D. M. Lin, J. B. Tui J. Schamu Senor Directorate Air Force Reearch Laboratory Abtract--- Thi paper preent a oftware-baed method
More informationActive vibration isolation for a 6 degree of freedom scale model of a high precision machine
Active vibration iolation for a 6 degree of freedom cale model of a high preciion machine W.B.A. Boomma Supervior Report nr : Prof. Dr. Ir. M. Steinbuch : DCT 8. Eindhoven Univerity of Technology Department
More informationDIAGNOSIS OF ROLLING ELEMENT BEARING FAULT IN BEARING-GEARBOX UNION SYSTEM USING WAVELET PACKET CORRELATION ANALYSIS
DIAGNOSIS OF ROLLING ELEMENT BEARING FAULT IN BEARING-GEARBOX UNION SYSTEM USING WAVELET PACKET CORRELATION ANALYSIS Jing Tian and Michael Pecht Prognostics and Health Management Group Center for Advanced
More informationDesign, Realization, and Analysis of PIFA for an RFID Mini-Reader
Deign, Realization, and Analyi of PIFA for an RFID Mini-Reader SUNG-FEI YANG ; TROY-CHI CHIU ; CHIN-CHUNG NIEN Indutrial Technology Reearch Intitute (ITRI) Rm. 5, Bldg. 5, 95, Sec., Chung Hing Rd., Chutung,
More informationA Faster and Accurate Method for Spectral Testing Applicable to Noncoherent Data
A Fater and Accurate ethod for Spectral Teting Applicable to Noncoherent Data inhun Wu 1,2, Degang Chen 2, Guican Chen 1 1 School of Electronic and Information Engineering Xi an Jiaotong Univerity, Xi
More informationAN EVALUATION OF DIGILTAL ANTI-ALIASING FILTER FOR SPACE TELEMETRY SYSTEMS
AN EVALUATION OF DIGILTAL ANTI-ALIASING FILTER FOR SPACE TELEMETRY SYSTEMS Alion de Oliveira Morae (1), Joé Antonio Azevedo Duarte (1), Sergio Fugivara (1) (1) Comando-Geral de Tecnologia Aeroepacial,
More informationAnalysis. Control of a dierential-wheeled robot. Part I. 1 Dierential Wheeled Robots. Ond ej Stan k
Control of a dierential-wheeled robot Ond ej Stan k 2013-07-17 www.otan.cz SRH Hochchule Heidelberg, Mater IT, Advanced Control Engineering project Abtract Thi project for the Advanced Control Engineering
More informationA COMPARISON OF METHODS FOR EVALUATING THE TEST ZONE PERFORMANCE OF ANECHOIC CHAMBERS DESIGNED FOR TESTING WIRELESS DEVICES
A COMPARISON OF METHODS FOR EVALUATING THE TEST ZONE PERFORMANCE OF ANECHOIC CHAMBERS DESIGNED FOR TESTING WIRELESS DEVICES Jame D. Huff John C. Mantovani Carl W. Sirle The Howland Company, Inc. 4540 Atwater
More informationPower Quality Disturbance Data Compression Using Wavelets Transform
Internional Conference on Computer, Sytem and Electronic Engineering (ICSCEE') April 6, Johanneburg (South Africa) Power Quality Diturbance Da Compreion Uing Wavelet Tranform S. Mohammadzadeh, S. Gh. Seifoad,
More informationThe Low-frequency Compensation of the Vibration Sensor s Amplitude-frequency Characteristics
Senor & Tranducer, Vol. 8, Iue, October 4, pp. -7 Senor & Tranducer 4 by IFSA Publihing, S. L. http://www.enorportal.com The Low-frequency Compenation of the Vibration Senor Amplitude-frequency Characteritic
More informationAvailable online at ScienceDirect. Procedia Technology 21 (2015 ) SMART GRID Technologies, August 6-8, 2015
Available online at www.ciencedirect.com ScienceDirect Procedia Technology 1 (15 ) 589 595 SMART GRID Technologie, Augut 6-8, 15 An Optimization Algorithm for Voltage Flicer Analyi Athira S a*, Hariumar
More informationOperation of the Discrete Wavelet Transform: basic overview with examples
Operation o the Dicrete Wavelet Tranorm: baic overview with example Surname, name Antonino Daviu, Joe Alono (joanda@die.upv.e) Department Centre Ecuela Técnica Superior de Ingeniero Indutriale Departamento
More informationIdentification of Image Noise Sources in Digital Scanner Evaluation
Identification of Image Noie Source in Digital Scanner Evaluation Peter D. Burn and Don William Eatman Kodak Company, ocheter, NY USA 4650-95 ABSTACT For digital image acquiition ytem, analyi of image
More informationBearing fault detection of wind turbine using vibration and SPM
Bearing fault detection of wind turbine using vibration and SPM Ruifeng Yang 1, Jianshe Kang 2 Mechanical Engineering College, Shijiazhuang, China 1 Corresponding author E-mail: 1 rfyangphm@163.com, 2
More informationREAL-TIME IMPLEMENTATION OF A NEURO-AVR FOR SYNCHRONOUS GENERATOR. M. M. Salem** A. M. Zaki** O. P. Malik*
Copyright 2002 IFAC 5th Triennial World Congre, Barcelona, Spain REAL-TIME IMPLEMENTATION OF A NEURO- FOR SYNCHRONOUS GENERATOR M. M. Salem** A. M. Zaki** O. P. Malik* *The Univerity of Calgary, Canada
More informationRotating Machinery Fault Diagnosis Techniques Envelope and Cepstrum Analyses
Rotating Machinery Fault Diagnosis Techniques Envelope and Cepstrum Analyses Spectra Quest, Inc. 8205 Hermitage Road, Richmond, VA 23228, USA Tel: (804) 261-3300 www.spectraquest.com October 2006 ABSTRACT
More informationSINGLE-PHASE ACTIVE FILTER FOR HIGH ORDER HARMONICS COMPENSATION
.jee.ro SINGLE-PHASE ACTIVE FILTER FOR HIGH ORDER HARMONICS COMPENSATION Kyo-Beum Lee Diviion of Electrical and Computer Engineering, Ajou Univerity San5, Woncheon-dong, Yeontong-gu, Suon 44-749, Korea
More informationInfluence of Sea Surface Roughness on the Electromagnetic Wave Propagation in the Duct Environment
RADIOENGINEERING, VOL. 19, NO. 4, DECEMBER 1 61 Influence of Sea Surface Roughne on the Electromagnetic Wave Propagation in the Duct Environment Xiaofeng ZHAO, Sixun HUANG Intitute of Meteorology, PLA
More informationA CALIBRATION SYSTEM FOR LASER VIBROMETERS AT NIMT
XX IMEKO World Congre Metrology for Green Growth September 9 14, 2012, Buan, Republic of Korea A CALIBRATION SYSTEM FOR LASER VIBROMETERS AT NIMT C. Hirunyapruk, P. Rattanangkul, B. Thummawut, V. Plangangma
More informationTime-Domain Coupling to a Device on Printed Circuit Board Inside a Cavity. Chatrpol Lertsirimit, David R. Jackson and Donald R.
Time-Domain Coupling to a Device on Printed Circuit Board Inide a Cavity Chatrpol Lertirimit, David R. Jackon and Donald R. Wilton Applied Electromagnetic Laboratory Department of Electrical Engineering,
More informationROTOR BROKEN BAR DIAGNOSIS IN ASD USING INSTANTANEOUS POWER SPECTRUM AND MEAN ABSOLUTE DIFFERENCE APPROACH A COMBINED TECHNIQUE
ROTOR BROKEN BAR DIAGNOSIS IN ASD USING INSTANTANEOUS POWER SPECTRUM AND MEAN ABSOLUTE DIFFERENCE APPROACH A COMBINED TECHNIQUE H.H. Hanafy A. M. Huien E. A. El-Zahab Electrical Power and Machine Department,
More informationAn Improved Method for Bearing Faults diagnosis
An Improved Method for Bearing Faults diagnosis Adel.boudiaf, S.Taleb, D.Idiou,S.Ziani,R. Boulkroune Welding and NDT Research, Centre (CSC) BP64 CHERAGA-ALGERIA Email: a.boudiaf@csc.dz A.k.Moussaoui,Z
More informationDESIGN OF SECOND ORDER SIGMA-DELTA MODULATOR FOR AUDIO APPLICATIONS
DESIGN OF SECOND ORDER SIGMA-DELTA MODULATOR FOR AUDIO APPLICATIONS 1 DHANABAL R, 2 BHARATHI V, 3 NAAMATHEERTHAM R SAMHITHA, 4 G.SRI CHANDRAKIRAN, 5 SAI PRAMOD KOLLI 1 Aitant Profeor (Senior Grade), VLSI
More informationChapter Introduction
Chapter-6 Performance Analyi of Cuk Converter uing Optimal Controller 6.1 Introduction In thi chapter two control trategie Proportional Integral controller and Linear Quadratic Regulator for a non-iolated
More informationRobust Control of an Active Suspension System Using H 2 & H Control Methods. Fatemeh Jamshidi 1, Afshin Shaabany 1
Journal of American Science, 11;(5) Robut Control of an Active Supenion Sytem Uing H & H Control Method Fatemeh Jamhidi 1, Afhin Shaabany 1 1 Ilamic Azad Univerity, Far Science and Reearch Branch, Shiraz,
More informationA Real-Time Wireless Channel Emulator For MIMO Systems
A eal-time Wirele Channel Emulator For MIMO Sytem Hamid Elami, Ahmed M. Eltawil {helami,aeltawil}@uci.edu Abtract: The improvement in channel capacity hailed by MIMO ytem i directly related to intricate
More informationControl of Electromechanical Systems using Sliding Mode Techniques
Proceeding of the 44th IEEE Conference on Deciion and Control, and the European Control Conference 25 Seville, Spain, December 2-5, 25 MoC7. Control of Electromechanical Sytem uing Sliding Mode Technique
More informationA Feasibility Study on Frequency Domain ADC for Impulse-UWB Receivers
A Feaibility Study on Frequency Domain ADC for Impule-UWB Receiver Rajeh hirugnanam and Dong Sam Ha VV (Virginia ech VLSI for elecommunication Lab Department of Electrical and Computer Engineering Virginia
More informationPhase-Locked Loops (PLL)
Phae-Locked Loop (PLL) Recommended Text: Gray, P.R. & Meyer. R.G., Analyi and Deign of Analog Integrated Circuit (3 rd Edition), Wiley (992) pp. 68-698 Introduction The phae-locked loop concept wa firt
More informationEFFECT OF THE FEEDER CABLE AND TRANSFORMER IMPEDANCE ON THE MECHANICAL OUTPUT CHARACTERISTIC OF THE INDUCTION MOTOR
Intenive Programme Renewable Energy Source May 2011, Železná Ruda-Špičák, Univerity of Wet Bohemia, Czech Republic EFFECT OF THE FEEDER CABLE AND TRANSFORMER IMPEDANCE ON THE MECHANICAL OUTPUT CHARACTERISTIC
More informationAdaptive Groundroll filtering
Adaptive Groundroll filtering David Le Meur (CGGVerita), Nigel Benjamin (CGGVerita), Rupert Cole (Petroleum Development Oman) and Mohammed Al Harthy (Petroleum Development Oman) SUMMARY The attenuation
More informationCHAPTER 2 WOUND ROTOR INDUCTION MOTOR WITH PID CONTROLLER
16 CHAPTER 2 WOUND ROTOR INDUCTION MOTOR WITH PID CONTROLLER 2.1 INTRODUCTION Indutrial application have created a greater demand for the accurate dynamic control of motor. The control of DC machine are
More informationMAX3610 Synthesizer-Based Crystal Oscillator Enables Low-Cost, High-Performance Clock Sources
Deign Note: HFDN-31.0 Rev.1; 04/08 MAX3610 Syntheizer-Baed Crytal Ocillator Enable Low-Cot, High-Performance Clock Source MAX3610 Syntheizer-Baed Crytal Ocillator Enable Low-Cot, High-Performance Clock
More informationIJSRD - International Journal for Scientific Research & Development Vol. 3, Issue 11, 2016 ISSN (online):
IJSRD - International Journal for Scientific Reearch & Development Vol. 3, Iue 11, 2016 ISSN (online): 2321-0613 Deign and Analyi of IIR Peak & Notch Ravi Choudhary 1 Pankaj Rai 2 1 M.Tech. Student 2 Aociate
More informationProduced in cooperation with. Revision: May 26, Overview
Lab Aignment 6: Tranfer Function Analyi Reviion: May 6, 007 Produced in cooperation with www.digilentinc.com Overview In thi lab, we will employ tranfer function to determine the frequency repone and tranient
More informationA moving sound source localization method based on TDOA
A moving ound ource localization method baed on TDOA Feng MIAO; Diange YANG ; Ruia WANG; Junie WEN; Ziteng WANG; Xiaomin LIAN Tinghua Univerity, China ABSTRACT The Time Difference of Arrival (TDOA) method
More informationMethod to Improve Range and Velocity Error Using De-interleaving and Frequency Interpolation for Automotive FMCW Radars
International Journal o Signal Proceing, Image Proceing and Pattern Recognition Vol. 2, No. 2, June 2009 Method to Improve Range and Velocity Error Uing De-interleaving and Frequency Interpolation or Automotive
More informationResonant amplifier L A B O R A T O R Y O F L I N E A R C I R C U I T S. Marek Wójcikowski English version prepared by Wiesław Kordalski
A B O R A T O R Y O F I N E A R I R U I T S Reonant amplifier 3 Marek Wójcikowki Englih verion prepared by Wieław Kordalki. Introduction Thi lab allow you to explore the baic characteritic of the reonant
More informationThe industry s Lowest Noise 10 V/G Seismic IEPE Accelerometer
The indutry Lowet Noie 10 V/G Seimic IEPE Accelerometer Felix A. Levinzon Endevco/Meggitt Corp. 30700 Rancho Viejo Road San Juan Capitrano, CA 9675 Robert D. Drullinger Lambda Tech LLC 998 Saratoga CT,
More informationThe Performance Analysis of MIMO OFDM System with Different M-QAM Modulation and Convolution Channel Coding
The Performance Analyi of MIMO OFDM Sytem with Different M-QAM Modulation and Convolution Channel Coding H. S. Shwetha M.tech, Digital Communication Engineering Siddaganga Intitute of Technology Tumakuru,
More informationIntegral Control AGC of Interconnected Power Systems Using Area Control Errors Based On Tie Line Power Biasing
ISSN (Online) 232 24 ISSN (Print) 232 5526 Vol. 2, Iue 4, April 24 Integral Control AGC of Interconnected Power Sytem Uing Area Control Error Baed On Tie Line Power Biaing Charudatta B. Bangal Profeor,
More informationProceedings of the ASME 2013 Rail Transportation Division Fall Technical Conference RTDF2013 October 15-17, 2013, Altoona, Pennsylvania, USA
Proceeding of the ASME 0 Rail Tranportation Diviion Fall Technical Conference RTDF0 October 5-7, 0, Altoona, Pennylvania, USA RTDF0-4705 Toward a Better Undertanding of the Rail Grinding Mechanim Shaodan
More informationVoltage Analysis of Distribution Systems with DFIG Wind Turbines
1 Voltage Analyi of Ditribution Sytem with DFIG Wind Turbine Baohua Dong, Sohrab Agarpoor, and Wei Qiao Department of Electrical Engineering Univerity of Nebraka Lincoln Lincoln, Nebraka 68588-0511, USA
More informationResearch on Direct Torque Control of Induction Motor Based on TMS320LF2407A
Available online at www.ciencedirect.com Phyic Procedia 5 ( ) 53 59 International Conference on Solid State Device and Material Science Reearch on Direct Torque Control of Induction Motor Baed on TMS3LF47A
More informationCommunication Systems, 5e
Communication Sytem, 5e Chapter 6: Sampling and pule modulation A. Bruce Carlon Paul B. Crilly 00 The McGraw-Hill Companie Chapter 6: Sampling and pule modulation Sampling theory and practice Pule-amplitude
More informationTechniques for Implementing a Model Simulated on a Physical Drive Vector Control
3 rd International Sympoium on Electrical Engineering and Energy er September 24-25, 2009, Suceava Technique for Implementing a Model Simulated on a Phyical Drive Vector Control Ciprian AFANASOV "Stefan
More informationFast Thermal Cycling Stress and Degradation in Multilayer Interconnects
Fat Thermal Cycling Stre and Degradation in Multilayer Interconnect H.V. Nguyen 1, C. Salm 1, J. Vroemen 2, J. Voet 2, B. Krabbenborg 2 J. Bichop 2, A. J. Mouthaan 1 and F. G. Kuper 1,2 1 Univerity of
More informationHIGH VOLTAGE DC-DC CONVERTER USING A SERIES STACKED TOPOLOGY
HIGH VOLTAGE DC-DC CONVERTER USING A SERIES STACKED TOPOLOGY Author: P.D. van Rhyn, Co Author: Prof. H. du T. Mouton Power Electronic Group (PEG) Univerity of the Stellenboch Tel / Fax: 21 88-322 e-mail:
More information2D FINITE-ELEMENT NUMERICAL SIMULATION OF SONIC MEASUREMENTS ACQUIRED IN THE PRESENCE OF A MANDREL TOOL
D FINITE-ELEMENT NUMERICAL SIMULATION OF SONIC MEASUREMENTS ACQUIRED IN THE PRESENCE OF A MANDREL TOOL Paweł J. Matuzyk 1, Lezek Demkowicz 1, David Pardo, Jun Ma 1, and Carlo Torre-Verdín 1, 1 The Univerity
More informationMIMO Systems: Multiple Antenna Techniques
ADVANCED MIMO SYSTEMS MIMO Sytem: Multiple Antenna Technique Yiqing ZOU, Zhengang PAN, Kai-Kit WONG Dr, Senior Member of IEEE, Aociate Editor, IEEE TWirele, IEEE CL, and JoC (AP), Senior Lecturer, Department
More information/09/$ IEEE 472
Bai Puruit for Robut Paive Acoutic Beamforming Ben Shapo and Chri Kreucher Integrity Application Incorporated 900 Victor Way, Suite 220 Ann Arbor, MI 48108 bhapo@integrity-app.com, ckreuche@umich.edu Abtract
More informationSelf-Programmable PID Compensator for Digitally Controlled SMPS
6 IEEE COMPEL Workhop, Renelaer Polytechnic Intitute, Troy, NY, USA, July 16-19, 6 Self-Programmable PID Compenator for Digitally Controlled SMPS Zhenyu Zhao and Alekandar Prodi Univerity of Toronto Toronto,
More informationRESEARCH ON NEAR FIELD PASSIVE LOCALIZATION BASED ON PHASE MEASUREMENT TECHNOLOGY BY TWO TIMES FREQUENCY DIFFERENCE
RESEARCH ON NEAR FIED PASSIVE OCAIZATION BASED ON PHASE MEASUREMENT TECHNOOGY BY TWO TIMES FREQUENCY DIFFERENCE Xuezhi Yan, Shuxun Wang, Zhongheng Ma and Yukuan Ma College of Communication Engineering
More informationSIMULATION OF TWO CONTINUOUS DTC SCHEMES FOR THE INDUCTION MOTOR
SIMULATION OF TWO CONTINUOUS DTC SCHEMES FOR THE INDUCTION MOTOR Sergiu Ivanov Faculty of Engineering in Electromechanic, Environment and Indutrial Informatic Univerity of Craiova RO-200440, Craiova, Romania
More informationDigital Control of Boost PFC AC-DC Converters with Predictive Control
Proceeding of the th International Middle Eat Power Sytem Conference (MEPCON ), Cairo Univerity, Egypt, December 9-,, Paper ID 7. Digital Control of Boot PFC AC-DC Converter with Predictive Control H.Z.Azazi
More informationDynamic Induction Machine Model Accounting for Stator and Rotor Slotting
1 Dynamic Induction Machine Model Accounting for Stator and Rotor Slotting Gojko Jokimović, Jakša Riger, Thoma Wolbank, Nedjeljko Perić, Mario Vašak, Goran Stojčić, Vinko Lešić Abtract A method for dynamic
More informationInstantaneous Cycle-Slip Detection and Repair of GPS Data Based on Doppler Measurement
Intantaneou Cycle-Slip Detection and Repair of GPS Data Baed on Doppler Meaurement Zhoufeng Ren, Liyan Li, Jie Zhong, and Minjian Zhao Abtract In GPS receiver, carrier phae meaurement can be ued to improve
More informationDesign of Centralized PID Controllers for TITO Processes*
6th International Sympoium on Advanced Control of Indutrial Procee (AdCONIP) May 8-3, 07. Taipei, Taiwan Deign of Centralized PID Controller for TITO Procee* Byeong Eon Park, Su Whan Sung, In-Beum Lee
More informationImplementation and Validation of the Nordic Test System in DIgSILENT PowerFactory
07 IEEE. Peronal ue of thi material i permitted. Permiion from IEEE mut be obtained for all other ue, in any current or future media, including reprinting/republihing thi material for advertiing or promotional
More informationAmit Panwar 1, Prof. Sunita Chahar 2
International Journal of Advanced Engineering Reearch and Science (IJAERS) Vol3, Iue, Jan 06] ISSN: 3496495 Automatic Load Frequency Control of Multi Area ower Sytem uing Fuzzy Logic Amit anwar, rof. Sunita
More informationElectrical Motor Current Signal Analysis using a Modulation Signal Bispectrum for the Fault Diagnosis of a Gearbox Downstream
Journal o Phyic: Conerence Serie Electrical Motor Current Signal Analyi uing a Modulation Signal Bipectrum or the ault Diagnoi o a Gearbox Downtream To cite thi article: M Haram et al J. Phy.: Con. Ser.
More informationKalman Filtering Based Object Tracking in Surveillance Video System
(669 -- 917) Proceeding of the 3rd (2011) CUSE International Conference Kalman Filtering Baed Object racking in Surveillance Video Sytem W.L. Khong, W.Y. Kow, H.. an, H.P. Yoong, K..K. eo Modelling, Simulation
More informationA New Technique to TEC Regional Modeling using a Neural Network.
A New Technique to TEC Regional Modeling uing a Neural Network. Rodrigo F. Leandro Geodetic Reearch Laboratory, Department of Geodey and Geomatic Engineering, Univerity of New Brunwick, Fredericton, Canada
More informationA Multi-Machine Power System Stabilizer Using Fuzzy Logic Controller
A Multi-Machine Power Sytem Stabilizer Uing Fuzzy Logic Controller Dr. A. Taifour Ali, 2 Dr. Eia Bahier M Tayeb, 3 M. Kawthar A. Adam,2 College of Engineering; Sudan Univerity of Science & Technology;
More informationPrevious lecture. Lecture 5 Control of DVD reader. TheDVD-reader tracking problem. Can you see the laser spot?
Lecture 5 Control of DVD reader Previou lecture Focu control Radial control (Track following) Lecture 4: Specification in frequency domain Loop haping deign Problem formulation Modeling Specification Focu
More informationSCK LAB MANUAL SAMPLE
SCK LAB MANUAL SAMPLE VERSION 1.2 THIS SAMPLE INCLUDES: TABLE OF CONTENTS TWO SELECTED LABS FULL VERSION IS PROVIDED FREE WITH KITS Phone: +92 51 8356095, Fax: +92 51 8311056 Email: info@renzym.com, URL:www.renzym.com
More informationReview of D-STATCOM for Stability Analysis
IOSR Journal of Electrical and Electronic Engineering (IOSRJEEE) ISSN : 78-676 Volume, Iue (May-June 0), PP 0-09 Review of D-STATCOM for Stability Analyi Pradeep Kumar, Niranjan Kumar & A.K.Akella 3 3
More informationA Flexible OFDM System Simulation Model. with BER Performance Test
Contemporary Engineering Science, Vol. 5, 2012, no. 8, 365-374 A Flexible OFDM Sytem Simulation Model with BER Performance Tet Aladdin Amro Al-Huein Bin Talal Univerity, Jordan Department of Communication
More informationSTRUCTURAL SEMI-ACTIVE CONTROL DEVICE
STRUCTURAL SEMI-ACTIVE CONTROL DEVICE Ming-Hiang SHIH SUMMARY Method for vibration reduction of tructure under dynamic excitation uch a wind and earthquake were generally claified into active control and
More informationSpeed Control of FSTP Inverter Fed Induction Motor Drive with a Neural Network Control
IOSR Journal of Electrical and Electronic Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 2320-3331, Volume 10, Iue 1 Ver. IV (Jan Feb. 2015), PP 14-22 www.iorjournal.org Speed Control of FSTP Inverter
More informationUNIVERSITY OF SASKATCHEWAN EE456: Digital Communications FINAL EXAM, 9:00AM 12:00PM, December 9, 2010 (open-book) Examiner: Ha H.
Name: Page 1 UNIVERSIY OF SASKACHEWAN EE456: Digital Communication FINAL EXAM, 9:00AM 1:00PM, December 9, 010 (open-book) Examiner: Ha H. Nguyen Permitted Material: Only textbook and calculator here are
More informationew approach to measuring vibration parameters of the remote objects with the ZigBee technique Borowik Bohdan
16 th IMEKO TC4 Sympoium Exploring New Frontier of Intrumentation and Method for Electrical and Electronic Meaurement Sept. -4, 8, Florence, Italy ew approach to meauring vibration parameter of the remote
More informationHARMONIC COMPENSATION ANALYSIS USING UNIFIED SERIES SHUNT COMPENSATOR IN DISTRIBUTION SYSTEM
HARMONIC COMPENSATION ANAYSIS USING UNIFIED SERIES SHUNT COMPENSATOR IN DISTRIBUTION SYSTEM * Montazeri M. 1, Abai Garavand S. 1 and Azadbakht B. 2 1 Department of Electrical Engineering, College of Engineering,
More informationRenewable Energy 36 (2011) 2508e2514. Contents lists available at ScienceDirect. Renewable Energy. journal homepage:
Renewable Energy 36 (2011) 2508e2514 Content lit available at ScienceDirect Renewable Energy journal homepage: www.elevier.com/locate/renene Implementation of photovoltaic array MPPT through fixed tep
More informationStudies on Novel Anti-jamming Technique of Unmanned Aerial Vehicle Data Link
Chinee Journal of Aeronautic 1(008) 141-148 Chinee Journal of Aeronautic www.elevier.com/locate/cja Studie on ovel Anti-jamming Technique of Unmanned Aerial Vehicle Data Link Huang enzhun a, *, ang Yongheng
More informationPublished in: Proceedings of 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)
Aalborg Univeritet A Synchronization Method for Grid Converter with Enhanced Small-Signal and Tranient Dynamic Steinkohl, Joachim; Taul, Mad Graungaard; Wang, Xiongfei; Blåbjerg, Frede; Haler, Jean- Philippe
More informationGemini. The errors from the servo system are considered as the superposition of three things:
Gemini Mount Control Sytem Report Prediction Of Servo Error Uing Simulink Model Gemini 9 July 1996 MCSJDW (Iue 3) - Decribe the proce of etimating the performance of the main axi ervo uing the non-linear
More informationModified 2D Finite-Difference Time-Domain Based Tunnel Path Loss Prediction for Wireless Sensor Network Applications
214 JOURNAL OF COMMUNICATIONS, VOL. 4, NO. 4, MAY 2009 Modified 2D Finite-Difference Time-Domain Baed Tunnel Path Lo Prediction for Wirele Senor Network Application Yan Wu Computer Laboratory, Univerity
More informationWavelet based demodulation of vibration signals generated by defects in rolling element bearings
Shock and Vibration 9 (2002) 293 306 293 IOS Press Wavelet based demodulation of vibration signals generated by defects in rolling element bearings C.T. Yiakopoulos and I.A. Antoniadis National Technical
More informationBefore the beginning of the Q wave At the top of the R wave After the end of the S wave
334 AcqKnowledge 4 Software Guide Detect and Claify Heartbeat Thi robut QRS detector i tuned for human ECG Lead II ignal. It attempt to locate QRS complexe and place an event near the center of each QRS
More informationA 77 GHz 3-Stage Low Noise Amplifier with Cascode Structure Utilizing Positive Feedback Network using 0.13 μm CMOS Process
JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, OL.8, NO.4, DECEMBER, 8 89 A 77 GHz 3-Stage Low Noie Amplifier with Cacode Structure Utilizing Poitive Feedback Network uing.13 μm CMOS Proce Choonghee
More informationAsymptotic Diversity Analysis of Alamouti Transmit Diversity with Quasi-ML Decoding Algorithm in Time-Selective Fading Channels
International Journal of Software Engineering and It Application Vol. 9, No. 1 (015), pp. 381-388 http://dx.doi.org/10.1457/ijeia.015.9.1.34 Aymptotic Diverity Analyi of Alamouti Tranmit Diverity with
More informationWavelet Transform for Bearing Faults Diagnosis
Wavelet Transform for Bearing Faults Diagnosis H. Bendjama and S. Bouhouche Welding and NDT research centre (CSC) Cheraga, Algeria hocine_bendjama@yahoo.fr A.k. Moussaoui Laboratory of electrical engineering
More informationDSP-Based Control of Boost PFC AC-DC Converters Using Predictive Control
DSP-Baed Control of Boot PFC AC-DC Converter Uing Predictive Control H.Z.Azazi*, E. E. E-Kholy**, S.A.Mahmoud* and S.S.Shokralla* * Electrical Engineering Department, Faculty of Engineering, Menoufiya
More informationSubcarrier exclusion techniques
Subcarrier excluion technique for coded OFDM ytem Kai-Uwe Schmidt, Jochen Ertel, Michael Benedix, and Adolf Finger Communication Laboratory, Dreden Univerity of Technology, 62 Dreden, Germany email: {chmidtk,
More informationOptimal Control for Single-Phase Brushless DC Motor with Hall Sensor
Reearch Journal of Applied Science, Engineering and Technology 5(4): 87-92, 23 ISSN: 24-7459; e-issn: 24-7467 Maxwell Scientific Organization, 23 Submitted: June 22, 22 Accepted: Augut 7, 22 Publihed:
More informationDesign and Performance Comparison of PI and PID Controllers For Half Bridge DC-DC Converter
International Journal of Advanced Reearch in Electrical and Electronic Engineering Volume: 2 Iue: 1 08-Mar-2014,ISSN_NO: 2321-4775 Deign and Performance Comparion of PI and PID Controller For Half Bridge
More informationDesign of hybrid continuous-time discrete-time delta-sigma modulators. Kwan, HK; Lui, SH; Lei, CU; Liu, Y; Wong, N; Ho, KL
Title Deign of hybrid continuou-time dicrete-time delta-igma modulator Author() Kwan, HK; Lui, SH; Lei, CU; Liu, Y; Wong, N; Ho, KL Citation Proceeding - Ieee International Sympoium On Circuit And Sytem,
More informationInternational Journal of Engineering Research & Technology (IJERT) ISSN: Vol. 1 Issue 6, August
ISSN: 2278-08 Vol. Iue 6, Augut - 202 The Turbo Code and an Efficient Decoder Implementation uing MAP Algorithm for Software Defined Radio Mr Rupeh Singh (Principal), Dr. Nidhi Singh (Aociate Profeor)
More informationGPS signal Rician fading model for precise navigation in urban environment
Indian Journal of Radio & Space Phyic Vol 42, June 203, pp 92-96 GPS ignal Rician fading model for precie navigation in urban environment G Sai Bhuhana Rao, G Sateeh Kumar $,* & M N V S S Kumar Department
More informationDistribution Transformer Due to Non-linear Loads
RESEARCH ARTICLE Derating of OPEN ACCESS Ditribution Tranformer Due to Non-linear Load Vihakha L. Mehram 1, Mr. S. V. Umredkar 2 Department of Electrical EngineeringShri Ramdeobaba College of Engineering
More informationDesign of buck-type current source inverter fed brushless DC motor drive and its application to position sensorless control with square-wave current
Publihed in IET Electric Power Application Received on 4th January 2013 Revied on 17th February 2013 Accepted on 4th March 2013 ISSN 1751-8660 Deign of buck-type current ource inverter fed bruhle DC motor
More informationFast & Accurate Algorithm for Jitter Test with a Single Frequency Test Signal
Fat & Accurate Algorithm for Jitter Tet ith a Single Frequency Tet Signal Minhun Wu 1,2, Degang Chen 2, Jingbo Duan 2 1 Xi an Jiaotong Univerity, Xi an,. R. China 2 Ioa State Univerity, Ame, IA, USA Abtract
More informationA SIMULATED ANNEALING BASED HYDROTHERMAL SYSTEM WITH THYRISTOR CONTROLLED PHASE SHIFTER UNDER OPEN MARKET SYSTEM
VOL., NO. 3, JUNE 007 ISSN 896608 006007 Aian Reearch Publihing Network (ARPN). All right reerved. A SIMULATED ANNEALING BASED HYDROTHERMAL SYSTEM WITH THYRISTOR CONTROLLED PHASE SHIFTER UNDER OPEN MARKET
More informationA Programmable Compensation Circuit for System-on- Chip Application
http://dx.doi.org/0.5573/jsts.0..3.98 JOURAL OF SEMICODUCTOR TECHOLOGY AD SCIECE, VOL., O.3, SEPTEMBER, 0 A Programmable Compenation Circuit for Sytem-on- Chip Application Woo-Chang Choi* and Jee-Youl
More informationComparison Study in Various Controllers in Single-Phase Inverters
Proceeding of 2010 IEEE Student Conference on Reearch and Development (SCOReD 2010), 13-14 Dec 2010, Putrajaya, Malayia Comparion Study in ariou Controller in Single-Phae Inverter Shamul Aizam Zulkifli
More informationUniversity of Huddersfield Repository
University of Huddersfield Repository Ball, Andrew, Wang, Tian T., Tian, X. and Gu, Fengshou A robust detector for rolling element bearing condition monitoring based on the modulation signal bispectrum,
More informationExperiment 8: Active Filters October 31, 2005
Experiment 8: Active Filter October 3, In power circuit filter are implemented with ductor and capacitor to obta the deired filter characteritic. In tegrated electronic circuit, however, it ha not been
More informationComparative Study of PLL, DDS and DDS-based PLL Synthesis Techniques for Communication System
International Journal of Electronic Engineering, 2(1), 2010, pp. 35-40 Comparative Study of PLL, DDS and DDS-baed PLL Synthei Technique for Communication Sytem Govind Singh Patel 1 & Sanjay Sharma 2 1
More information