Study of Electronic Direct Digital Control (DDC) Panel using Mechanical Vibration Exciter

Transcription

1 Study of Electronic Direct Digital Control (DDC) Panel uing Mechanical Vibration Exciter Kiran G. Shinde 1, Ahih R. Pawar 1, Hemant P. Kadam 1 1Department of Mechanical Engineering, D. Y. Patil College of Engineering, Akurdi, Pune-44, Savitribai Phule Pune Univerity, INDIA *** Abtract - Main purpoe of thi paper wa to tudy the deigned. Fixture wa deign on the bai of natural effect of vibration on electronic Direct Digital Control (DDC) frequency of DDC panel o that no reonance occur in panel. During tranportation thee panel get damaged due to it during teting. Uing modal analyi in ANSYS vibration. So under thi work a vibration exciter wa deign Workbench 16.0 natural frequencie were found. It to vibrate the electronic DDC panel with different frequencie. value hould be more than the teting object. After Mechanical vibration exciter i ued to generate thee manufacturing the tet wa conducted and reult were vibration. The maximum dimenion of panel wa 400 x 210 x obtained a amplitude of tet object at natural 180 mm. For finding the natural frequencie of panel modal analyi wa done in ANSYS WORKBENCH After that frequencie. A in cae of it working, the natural Fixture wa deign which wa ued to mount the DDC on it for frequency hould be in lower range for the proper teting. Natural frequency of fixture hould be greater than excitation which the project need to achieve o a to DDC panel o that reonance doen t occur in it. The force ue it for mall part. required to produce vibration wa depend on ma of DDC panel and fixture o ma of fixture hould be optimized. After 1.1Failure Mode of Electronic Device the deign vibration table wa manufactured and tet were taken. Variable Frequency Drive (VFD) wa ued to control peed of vibratory motor. After teting the location of damage found out and appropriate remedie were found to minimize it damage. Key Word: Mechanical Vibration Exciter, DDC panel, Fixture, Modal analyi, VFD. 1. INTRODUCTION A vibration exciter i a machine which produce mechanical vibration which are ued in our cae to tet the object. The vibration exciter i being deigned to produce a required range of harmonic or time dependent excitation force and diplacement through a given range of frequencie. Thi machine or a ytem can be mechanical, electro hydraulic or electrodynamic in nature. Different type of vibration exciter are available in the market which wa too cotly for mall cale application, o there wa a need to deign a relatively low cot exciter which can be ued for low frequency range and fulfil the need of project. Thi can be ued for experimentation purpoe and teting product at different frequencie to achieve the goal of project. During tranportation of DDC panel ome damage occur in the panel due to vibration in tranport vehicle. In order to find out location and frequency at which damage occur a mechanical vibration exciter i Fig. 1- Failure percentage of electronic component Electronic device which are ued in control, guidance and communication ytem are one of the mot important part of modern control ytem. Electronic ytem are compoed of many different material and interface which make ytem very complex. In addition to complexity, ytem are ubjected to variou environmental condition during torage, handling, tranportation and operation. Therefore, variou failure mode uch a mechanical, thermal and electrical are encountered in electronic ytem. Fig1.1 how the percentage of failure of electronic control ytem. 2016, IRJET Impact Factor value: 4.45 ISO 9001:2008 Certified Journal Page 2754

2 1.2 The Objective of Preent Work The Vibration Exciter hould Work between the deign frequency zone. Generated forced vibration frequency hould not match with Natural frequency of fixture. To develop phyically maller, impler, more reliable and le cotly. It fulfill the requirement of company. So that to focu on the DDC panel remedie. for controlling peed of vibration motor. Firt operating frequency hould be low (15 Hz). Then increae by tep by tep (up to 26 Hz). Diplacement and velocity meaure by Magnetic Senor Vibrometer. 2. EXPERIMENTAL SETUP Fig. 4 Actual Tet Setup Fig. 2 Schematic diagram of vibration exciter Direct Digital Control (DDC) panel in control ytem of Dynamometer tet rig i how the different parameter value like Torque, Speed, Temperature, and Power. It ha number of PCB attach for functioning it. There i Soldering on thee PCB during tranportation due to vibration thee oldering get damage or looe contact occur. So in order to find thi problem vibration tet i done.ddc panel and Tet Setup i hown in below figure. 2.1 Fixture Fixture i ued a intermediate between teting part and vibration exciter. It hould be tiff o it natural frequency more than natural frequency of teting part. It hould be o trong to take weight of teting part and other mounting. Alo it weight will be a low a poible. Fig. 5 - Fixture Fig. 3 DDC panel (Tet Object) For teting Firt of all on main witch then by preing puh button increae the frequency of Variable Frequency Drive (VFD) by operating knob. VFD i ue 2.2 Calculation Deign of Fixture Main Plate According to Rayleigh-Ritz Criteria (From Bruel and Kjaer) ɷ 2 = 4 x D/b 4 xρxh) x λ 2 Where h = Thickne of plate 2016, IRJET Impact Factor value: 4.45 ISO 9001:2008 Certified Journal Page 2755

3 λ = Mode cont. = ( x (b/l) x (b/l) 4 ) 1/2 By implifying the equation F =23.5x10^4x (h/b 2 ) x λ 1) OR F =23.5x10^4x (h/l 2 ) x λ {h, l = Dimenion in cm.} F min Max (b,l) For deign of fixture we take afe natural frequency a 1000 Hz. h = (F xl 2 )/(4x23.5x10^4x λ) 2) = (1000x ) / (4x23.5x10^4x1.31) = 3.11 ~ 3.5 mm. By conidering Manufacturing Allowance h = 6 mm Side brace (mall ide) (b/l) = 50/50 = 1 λ = 1.31 By putting thi value in equation 1 we get h 1 = 0.81 ~ 1 mm. By conidering Manufacturing Allowance h = 3 mm Side brace (large ide) (b/l) = 190/50 = 3.8 λ = 5.88 h 2 = 2.48 ~ 2.5mm. By conidering Manufacturing Allowance h = 3mm Deign of Helical Spring Total Weight = 40 kg = 400 N. Total No of Spring = Therefore force on each pring = 100 N τ max=0.3x S ut {Harden and Tempered (C65) Grade1 S ut=1050 Mpa and C=8} (From deign data book by PSG) = 03x1050 = 315 Mpa τ max = K x (8xpxc/πxd 2 ) Where, P = load in N K = Wahl factor C = Spring Index 4xc k 4xc 4 c 4x k 4x8 4 8 k = = (1.226x8x100x8)/(πxd 2 ) d =2.81~3.2mm D = C x d = 8x3.2 =25.6 mm ~ 25 mm Now aume maximum deflection will be conidered a 15 mm. Therefore, K= P/δ = 100/15 = 6.67N/mm ~ 6.7 N/mm. No of coil turn δ = (8xpxD 3 xn)/ (Gxd 4 ) Where G = Torional Rigidity G = N/mm 2 15 = (8x100x32 3 xn)/(81370x4 4 ) N = =12.23 ~ 12 mm. Solid Length = N x d = 12x3.2 = 38.4 mm Total Length = Solid Length+ δ = = 55 mm Pitch of pring Pitch = (L- 3xd)/N = (55-3x3.2)/10.23 = 4.44 mm. 2.3 Vibratory Motor Vibratory motor ue for generating the vibration and VFD i ued for controlling the peed of motor. Below Table how the Characteritic of motor. Table 1 Specification of vibratory Motor Power 0.16 Kw Centrifugal Force 1940 N Weight 11.8 Kg RPM 1440 Fig. 6 - Vibratory Motor 2.4 Experimental Reult By taking tet on DDC panel the amplitude and velocity occur at different frequency and RPM a given in Table , IRJET Impact Factor value: 4.45 ISO 9001:2008 Certified Journal Page 2756

4 Table 2- Experimental Analyi Frequency and Sr. No. Speed (RPM) Frequenc y(hz) Amplitud e(mm) Velocity( mm/) NUMERICAL METHOD 3.1 Modal Analyi Modal analyi wa done in ANSYS WORKBENCH 16.0 to find out natural frequency of Fixture a well a DDC panel o it eay to undertand the range of natural frequency to avoid reonance in fixture. Table 4 Natural frequency and amplitude of tet object (DDC). Mode Shape No. Frequency (Hz) Maximum (mm) Harmonic Repone Analyi Harmonic repone analyi require boundary condition a Frequency range and load a force, diplacement, acceleration. Thi give output a tre, train, diplacement, and phae. Boundary condition Frequency range 10 to 200 Hz. Load a force 1940 N. Table 5- Harmonic Analyi Frequency and Sr. No. Frequency(Hz) (mm) Fig. 7 Modal analyi of fixture Table 3 Natural frequency and amplitude of fixture Mode Frequency(Hz) (mm) Shape no Fig. 8 Modal analyi of Tet object (DDC) RESULTS AND DISCUSSION Table 6- Comparion between Harmonic analyi V/. Experimental Analyi Sr. No. Harmonic Analyi Frequency Experimental Analyi Frequency A the frequency or peed increae the amplitude of vibration alo increae. A at high frequency more amplitude of vibration produce o initial it keep at low frequency then increae it lowly. The deviation occur in reult due to meaurement of amplitude on vibrometer during teting. 2016, IRJET Impact Factor value: 4.45 ISO 9001:2008 Certified Journal Page 2757

5 5. CONCLUSIONS From Table 3 it eem that, the natural frequency of fixture i more than DDC panel. After teting DDC panel at different peed, next tep wa to check the DDC panel for proper working. Then proper remedie are found to olve thi problem, like increae in the tiffne or trong the oldering on PCB. Mechanical unbalanced vibration exciter i ued a low frequency vibration exciter. Maximum frequency obtained i 50 Hz. So it i ued for mall part and low frequency range. Banu Aytekin Vibration analyi of PCB and electronic component, April Bruel and Kjaer Fixture for B and K vibration, October Book Deign of Machine Element by V. B. Bhandari. Deign Data Book by PSG. Internet ACKNOWLEDGEMENT I would like to expre my gratitude to Prof. Suhant S. Pande and Dr. Tapobrata Dey (P.G. Coordinator) for their valuable guidance and encouragement in carrying out the project work. The round of dicuion with them gave fruitful direction to thi work. It i privilege to expre my deep ene of gratitude Vikrant Jagtap (Executive Director) whoe word of expertie provided me the valuable help for the ame. I alo extend my appreciation toward valuable guidance from Raviraj Kumbhar for howing the right way for the execution of project work. REFERENCES Paper from Journal 1. Siwanto Waluyo Adi, Ibrahim Mohd Norihan, Madlan Mohd Amran, and Mohamad Siti Mariah Shaker Table Deign for Electronic Device Vibration Tet Sytem Vol. 3, No. 6, (December 2011). 2. Reddy T. Sriniva and Reddy K. Vijaya Kumar Deign and analyi of vibration tet bed fixture for pace launch vehicle. Vol. 3 No. 5 (May 2010). 3. G. Phani Sowjanya, P. Divakara Rao, Dr. C.Udaya Kiran Finite Element Analyi of Vibration Fixture Made of Aluminum and Magneium Alloy. Vol. 2 Iue 1 January Anekar Nitinkumar, Ruiwale V.V., Nimbalkar Shrikant, Rao Pramod Deign and teting of unbalanced ma Mechanical vibration exciter. Volume: 03 (Auget-2014). Report Kara Buckley Lee Chiang Deign and analyi of vibration tet fixture for payload, October , IRJET Impact Factor value: 4.45 ISO 9001:2008 Certified Journal Page 2758