Experimental Research Regarding the Dynamic Behaviour of the Classical Guitar
|
|
- Magnus Robbins
- 6 years ago
- Views:
Transcription
1 Experimental Research Regarding the Dynamic Behaviour of the Classical Guitar IOAN CURTU, MARIANA D. STANCIU Department of Strength of Materials and Mechanical Vibrations Transilvania University of Braşov, Adress: B-dul Eroilor nr. 29, Braşov ROMANIA RAIMOND GRIMBERG, ADRIANA SAVIN National Institute of Research& Development for Technical Physics of Iasi Address: B-dul D. Mangeron nr. 47, Iaşi, , ROMANIA Abstract: This paper presents the results of some experimental work regarding the dynamic behaviour of the classical guitar manufactured by SC Hora SA Reghin Romania. From the different types of guitars made by the Romanian factory, the guitar with 5 radial braces was the one analyzed. To establish the influence of the neck on the guitar stiffness and its dynamic response, the acoustic box (without the neck and the bridge) and the guitar body (with the neck) were investigated. Chladni figures, frequency responses, power spectrum density and dynamic mass were collected and compared in both cases. This research is useful to improve the acoustic quality of a guitar from the point of view of construction optimization. Key-Words: Chladni figures, frequency response, guitar body, stiffness, power spectral density 1 Introduction The acoustic quality of a guitar depends on the physical, mechanical (elastic) and dynamic characteristics of the wood species used in the construction of the different components of the guitar, namely: the geometry and the sizes of the elements, the density, the moisture content, the Young s modulus, the stiffness modulus, the shear resistance, the bending strength, the sound velocity in wood, the acoustic impedance, the acoustic radiation, the quality factor [3], [5], [9], [11]. Between the component parts of guitars (the neck, the plates from the acoustic box, the bridge, the strings) there exists a power connection which assures the static, the dynamic and the acoustic equilibrium of the musical instrument as it shown in Fig. 1. Fig. 1. The mechanical structure of the guitar [4] During the guitar s manufacturing, each added element can change the stiffness and, implicitly, the dynamic behaviour of the instrument [10], [12]. These structural modifications can improve or not the guitar s tone. 2 Previous work Many theoretical and experimental studies on different types of guitars were investigated from numerous points of view: physical, psychoacoustical, mechanical, mathematical, musical, and the problems are still open. Due to the complexity of the phenomena of stringed instruments, each researcher dealt with the aspects which he considered relevant to him. Some of them, like Elejabarrieta, Ezcurra and Santamaria (2004, 2007), performed the modal analysis and the vibration behaviour on the classical guitar in its different construction stages using FEM [7], [8]. Others Bernard Richardson, Howard Wright with some colleagues from Cardiff University and Ra Inta from University of New South Wales tried to establish the influence of the individual components, monitoring the quantitative and qualitative contributions [10], [20], [13], [14]. Paul M. Shaheen (2004) focused on the ISSN: ISBN:
2 sensitivity analyses of the folk guitar simulating the building process [15]. Serghei Vladimirovici (2006) researched the influence of the Russian strutting system on the dynamic behaviour of the plates and managed to improve the quality of the sound of the guitar according to the design and the dimensions of the fan bracing [19]. For Becache, Chaigne, Derveaux and Joly (2004) the simulation coupling between the inner fluid and the structure represented one of the theoretical studies [2]. Stanciu, Curtu, Itu (2008) focused on the modelling of the different types of classical guitar manufactured in their country and on analysing the dynamic behaviour of the plates as free structures and as parts of the guitar body [6], [16], [17], [18]. Bader (2005) brought into focus the physical sounds of the instruments from a musicological point of view. He approached the difference between continual and discrete mechanics, elaborating an interesting theory about impedance of second order to solve the problem of overtones [1]. 3 Experimental Analyses The present paper deals with the scientific study of music. The work aims to analyze the influence of the guitar neck on the frequency response of the acoustic box. 1-frequency generator 2-amplifier 3-vibration mass 4-force transducer 5-sample/structure 6 -accelerometers 7 spring support 8 conditioner 9 DAQ 10 personal computer to displaying and processing data Fig.3. The block diagram representation The signal capture and display were achieved through the program developed in LabVIEW, and the data obtained under a numerical form were processed using Microcal Origin [12]. To determine the Chladni figures, the top plate of the guitar body was covered with a thin uniform layer of sand having a grit size Case 1 Case 2 Fig. 2. The investigated structures Firstly, the guitar body without its neck was investigated (Fig. 2. and, secondly, the entire guitar (Fig. 2.. In both cases the bridge was neglected. Under analysis was the classical guitar with 5 radial braces on the top plate. The method used was performed under standardized conditions. An artificial simulation of a string vibration was created by means of the B&K 8210 mini-shaker. The experimental stand was built according to the scheme in Fig. 2 and for each sample. The captured signals were amplified and filtered through a conditioner (8), then were sent to the acquisition device (DAQ) (9) which was connected to the computer (10). c) Fig. 4. The accelerometers layout 3 Results and Discussion 3.1. Chladni patterns The Chladni figures in both cases of the structures were obtained for each exciting frequency as shown in Table 1. It can be noticed that nodal lines formed on the top plate are different from the ones formed on the back plate, regardless of the analyzed structure. This is due to several factors: the plate material (the top plate made of spruce, the back plate made of maple), the strutting system (the soundboard with 5 radial braces and the bottom plate with 3 transversal ribs), the presence of the sound hole on the top versus the full back plate, the contact between the ISSN: ISBN:
3 excitation source and the soundboard. Comparing the simple acoustic box with the guitar body, it can be remarked that the Chladni figures of the top plates differ, in spite of the similar conditions of the test (boundary conditions, materials, value of the periodical force, frequency). The neck attached to the guitar body, in the second case, is the only different element. The increased stiffness of the structure due to the presence of the neck leads to the increase of the frequency that produced the same modal shape (from 110 Hz, in first case, to 246 Hz, in the second case). The presence of the neck produced a different dynamic behaviour of the back plate. Table 1. Chladni figures of the simple acoustic box and of the guitar body - selection C A S E 1 compared to the dynamic behaviour of the guitar body without its neck. Fig. 5. The vibrations plot of the top plate of the guitar Fig. 6 a and b display the time histories of the soundboard ( and of the back plate ( for both of the analyzed cases. Under the same input conditions, the structures responded differently. The amplitudes of the guitar plates are higher than the magnitude of the acoustic box. In both cases the nonlinearities are not present. C A S E The Fourier analyses The main results of Fourier analyses are represented in Figs Fig. 5 shows the time evolution of the guitar soundboard captured at different points: A 1, A 2, A 3 A 7. For the present plot, the lower amplitude was recorded by the A 3 and A 7 accelerometers placed near the impedance head (A 3 ) and on the fret (A 7 ). The highest amplitudes of the soundboard were obtained in the area between the bridge and the sound hole. The same fact was noticed using the finite elements method in our previous studies [6], [16]. As symmetrical standpoints, the measurements from the A 2 and A 4 points revealed the same values of amplitudes of symmetrical areas, but opposite-phase movements. The modifications of the system dynamic behaviour due to the presence of the neck were Fig. 6 Comparison between the vibration output of the considered structures In Fig. 7 a and b the frequency responses of the top plates at 196 Hz, for cases 1 and 2, are illustrated. In ISSN: ISBN:
4 case of the acoustic box without its neck, overtones appear. Contrary, with the increasing of the structure rigidity, the guitar body resonates at excitation frequency, amplifying that frequency. The capacity of the top plate to filter and amplify the desired frequency represents one of the criteria for the acoustic quality of a guitar. In accordance with some luthiers, the harmonics are given by the back plate and by the coupling between the solid parts and the inner fluid of the guitar body. In Fig. 7 c, the frequency response of the points around the sound hole was analyzed. Numerous overtones could be noticed. The internal fluid vibrates, produces and absorbs all resonance frequencies and harmonics. The effect of this phenomenon is noticed mainly around the sound hole. Another analysis of the frequency response is the power spectral density displayed in Fig. 8 a, b, c and d. c) c) Fig. 7 The frequency spectrum d) Fig. 8 The power spectral density ISSN: ISBN:
5 Comparing the plot of energy dissipation in cases of different stiffness (Fig. 8 a free plate with 5 radial braces, b acoustic box of the guitar with 5 fan bars on the top plate, c guitar body with neck), a various dynamic behaviour of the structures can be remarked due to numerous factors. One of them is the increasing of rigidity as a result of added elements. In the case 2 - the guitar, the nonlinearities of energy distribution lack or are minimal. The back plate (Fig.8. d) has a similarly curve of energy dissipation like soundboard, with mention that it vibrates in opposite phase (Fig. 8 d). 4 Comparison with FEM Results In previous research, the dynamic behaviour of the plates and of certain structures made of plates was analyzed using the finite element method (FEM). structures, boundary conditions, strutting system). The numerical results regarding the vibrations of the classical guitar neck are presented in Fig. 9. Due to the difficulty of measuring the vibration modes of the neck, modal analyses were performed, using the FEM. As a result of the experimental and numerical investigations, it could be noticed that, due to its dimensions, its shape and its stiffness, the neck of the guitar vibrates at low frequencies (under 80 Hz). From a musical point of view, the neck influences the acoustics of the sounds at low and medium frequencies. From a mechanical point of view, the guitar, as a complex structure, is exposed, during vibrations, to complex stimuli (bending, traction, torsion). These aspects could be emphasized mainly by the finite elements method, usage being made of the field of tensions, deformations and displacements. 5 Conclusion The paper wanted to establish the way in which the increase of the general stiffness of the guitar (due to the presence of the neck) influences the dynamic behaviour of the acoustic box. Under analysis were only particular guitar structures / plates and for this, the results cannot be generalized. The contributions of this study aim at finding the manufacturing and technological solutions for the improvement in the acoustics of the musical instrument made by SC Hora SA Reghin. [21]. Being a complex structure, both as shape, materials and from the point of view of the mechanical phenomena, by making use of the experimental method, the simplification of the real conditions was sought, which lead to obtaining some particular results. The experimental results widely validate the theoretical ones. The combination of the two methods allowed the outlining of several more phenomena specific to vibrations. At present, the acoustic quality of a guitar in its real functioning conditions is under investigation. Fig. 9 Modal shapes of the guitar obtained with FEM Similar conditions were simulated (materials, density, Young modulus, thickness, types of 6 Acknowledgments This work was accomplished under the following grants: PNII /2007 project manager: Prof. Dr. Grimberg Raimond, INCDFT Iasi, scientific responsible P3 Prof. Dr. Eng. Curtu Ioan, Transilvania University of Brasov and TD cod 182, no. 222/2007, project responsible: Ph.D. Eng. Stanciu Mariana Domnica. ISSN: ISBN:
6 We are also grateful to the Technical Staff of S.C. HORA S.A. Reghin Romania for the logistic support. References: [1] Bader, R., Computational Mechanics of the Classical Guitar,Springer-Verlag Berlin Heidelberg N.Y., ISBN , in Netherland, [2] Bécache, E., Chaigne, A., Derveaux, G., Joly, P., Numerical simulation of a guitar. Computers and Structures, Vol 83, 2005, pp [3] Bucur, V., Acoustic of Wood. Springer-Verlag Berlin Heidelberg New York, 2006 [4] Curtu, I., Stanciu, Mariana, Itu, C., Grimberg, R., Numerical Modeling of the Acoustic Plates as Constituents of Stringed Instruments, in Proc. of the 6 th International Conference of DAAAM Baltic Industrial Engineering, ISBN , Tallinn, Estonia th April 2008, p [5] Curtu, I., Stanciu, M. D., Grimberg, R., Correlations between the Plate s Vibrations from Guitar s Structure and Physical, Mechanical and Ellastically Characteristics of the Composite Materials, Proceeding of the 9 th WSEAS Int. Conf. on Acoustic & Music: Theory and Applications (AMTA 08), ISBN Bucharest Romania June 2008, pp [6] Curtu I., Stanciu M. D., Savin A., The propagation of forced vibrations in coupled plates of guitars, Proceeding of the 19 th International DAAAM Symposium "Intelligent Manufacturing & Automation: Focus on Next Generation of Intelligent Systems and Solutions" ISSN , Trnava, Slovacia Octombrie 2008, pp [7] Ezcurra, Amaya 1, Elejabarrieta, M Jesús Santamaría, C., Internal Fluid Influence on the Dynamic Behavior of the Resonance box of the Guitar, [8] Elejabarrieta María Jesús, Ezcurra Amaia; Santamaría Carlos, Resonance Box of the Guitar Structure-Fluid Interaction, Proceeding of 19th International Congress on Acoustics Madrid, 2-7 september 2007, [9] Haines, D., The essential mechanical properties of wood prepared for musical instruments. Catgut Acoustic Society Journal, 2000, Vol 4(2): [10] Inta Ra, The acoustics of the steel string guitar, PhD Thesis, The University of New South Wales, Australia, September, [11] Rossing, T., Fletcher, N., Principle of Vibration and Sound second edition. Springer Science, New York, [12] Rosca, I. C., Vibratii mecanice, Ed. Infomarket Brasov, ISBN , [13] Russell, D., Modal analysis of an Acoustic Folk Guitar, PhD., Applied Physics, Kettering University, [14] Russel, D. and Paul Pedersen, Modal Analyses of an Electric Guitar, Kettering University January 29, [15] Shaheen, P. M., Sensitivity Analysis of the Natural Frequency and Modal Effective Weight of Mode (0,0) of the Top and Back Plate of an Acoustic Steel-String Guitar using FEM, PhD Thesis, [16] Stanciu, M. D., Curtu, I., Itu, C., Influence of strengthening bars of guitar s plates on the normal modes of vibrations using, Proc. of the 19 th International DAAAM Symposium "Intelligent Manufacturing & Automation: Focus on Next Generation of Intelligent Systems and Solutions" ISSN , Trnava, Slovacia Octombrie 2008, pp [17] Stanciu M. D., Cretu N. C., Rosca I. C., Curtu I., Experimental Research Regarding the Underdamped Free Vibration of Lignocellulose Plates from Guitar's Body, ProLigno ISSN , vol. 4, Nr , pp [18] Stanciu, Mariana, Curtu, I.., Itu, C., Grimberg, R., Dynamical Analysis with Finite Element Method of the Acoustic Plates as Constituents of the Guitar, ProLigno, Vol. 4, No. 1, March 2008, pp [19] Vladimirovici, S. Calculation Method for the Component Elements of Guitar, PhD Thesis. Technical State Institute Marii, [20] Wright, H., The Acoustics and psychoacoustics of the guitar. PhD Thesis. University of Wales, College of Cardiff [21] *** Technical Documentation of S.C. Hora S.A. Reghin Romania. ISSN: ISBN:
Aspects Regarding the Resonance Frequencies of Guitar Bodies with Different Strutting Systems
5 th International Vilnius Conference EURO Mini Conference Knowledge-Based Technologies and OR Methodologies for Strategic Decisions of Sustainable Development (KORSD-2009) September 30 October 3, 2009,
More information9th WSEAS Int. Conf. on ACOUSTICS & MUSIC: THEORY & APPLICATIONS (AMTA '08), Bucharest, Romania, June 24-26, 2008
Correlations between the Plates Vibrations from the Guitar s Structure and the Physical, Mechanical and Elastically Characteristics of the Composite Materials IOAN CURTU MARIANA DOMNICA STANCIU Department
More informationMODELING FLUID-STRUCTURE INTERACTION IN A BRAZILIAN GUITAR RESONANCE BOX
22nd International Congress of Mechanical Engineering (COBEM 2013) November 3-7, 2013, Ribeirão Preto, SP, Brazil Copyright 2013 by ABCM MODELING FLUID-STRUCTURE INTERACTION IN A BRAZILIAN GUITAR RESONANCE
More informationAcoustic Resonance Analysis Using FEM and Laser Scanning For Defect Characterization in In-Process NDT
ECNDT 2006 - We.4.8.1 Acoustic Resonance Analysis Using FEM and Laser Scanning For Defect Characterization in In-Process NDT Ingolf HERTLIN, RTE Akustik + Prüftechnik, Pfinztal, Germany Abstract. This
More informationEIGEN MODES IDENTIFICATION FOR HYBRID WIRE ROPE ISOLATORS
The 4th International Conference Advanced Composite Materials Engineering COMAT 2012 18-20 October 2012, Brasov, Romania EIGEN MODES IDENTIFICATION FOR HYBRID WIRE ROPE ISOLATORS D. Buzea 1, L. Kopacz
More informationA detailed experimental modal analysis of a clamped circular plate
A detailed experimental modal analysis of a clamped circular plate David MATTHEWS 1 ; Hongmei SUN 2 ; Kyle SALTMARSH 2 ; Dan WILKES 3 ; Andrew MUNYARD 1 and Jie PAN 2 1 Defence Science and Technology Organisation,
More informationInfluence of the Vibrational Properties of the Resonance Board on the Acoustical Quality of a Piano
Influence of the Vibrational Properties of the Resonance Board on the Acoustical Quality of a Piano Zhenbo Liu,* Yixing Liu, and Jun Shen The vibrational properties of eight resonance boards made from
More informationWhole geometry Finite-Difference modeling of the violin
Whole geometry Finite-Difference modeling of the violin Institute of Musicology, Neue Rabenstr. 13, 20354 Hamburg, Germany e-mail: R_Bader@t-online.de, A Finite-Difference Modelling of the complete violin
More informationEXPERIMENTAL ANALYSIS OF BOLT LOOSENING DYNAMICS CHARACTERISTIC IN A BEAM BY IMPACT TESTING
EXPERIMENTAL ANALYSIS OF BOLT LOOSENING DYNAMICS CHARACTERISTIC IN A BEAM BY IMPACT TESTING Meifal Rusli, Candra Mardianto and Mulyadi Bur Department of Mechanical Engineering, Faculty of Engineering,
More informationExtracting vibration characteristics of a guitar using finite element, modal analysis, and digital image correlation techniques
Extracting vibration characteristics of a guitar using finite element, modal analysis, and digital image correlation techniques Kiran Patil, Javad Baqersad, Daniel Ludwigsen, and Yaomin Dong Citation:
More informationExperimental investigation of crack in aluminum cantilever beam using vibration monitoring technique
International Journal of Computational Engineering Research Vol, 04 Issue, 4 Experimental investigation of crack in aluminum cantilever beam using vibration monitoring technique 1, Akhilesh Kumar, & 2,
More informationModeling of the part-pedaling effect in the piano
Proceedings of the Acoustics 212 Nantes Conference 23-27 April 212, Nantes, France Modeling of the part-pedaling effect in the piano A. Stulov a, V. Välimäki b and H.-M. Lehtonen b a Institute of Cybernetics
More informationModal vibration control of submarine hulls
Modal vibration control of submarine hulls B. Alzahabi Department of Mechanical Engineering, Kettering University, USA Abstract Cylindrical shells are widely used in many structural designs, such as offshore
More informationCRITERIONS OF QUALITY FOR TONEWOOD By Matthias Dammann
Side 1 of 10 CRITERIONS OF QUALITY FOR TONEWOOD By Matthias Dammann Unfortunately most of the sound relevant properties of tonewood are invisible. Nevertheless suppliers are still focused to offer fine
More informationTyre Cavity Coupling Resonance and Countermeasures Zamri Mohamed 1,a, Laith Egab 2,b and Xu Wang 2,c
Tyre Cavity Coupling Resonance and Countermeasures Zamri Mohamed 1,a, Laith Egab,b and Xu Wang,c 1 Fakulti Kej. Mekanikal, Univ. Malaysia Pahang, Malaysia 1, School of Aerospace, Mechanical and Manufacturing
More informationQuarterly Progress and Status Report. On the body resonance C3 and its relation to top and back plate stiffness
Dept. for Speech, Music and Hearing Quarterly Progress and Status Report On the body resonance C3 and its relation to top and back plate stiffness Jansson, E. V. and Niewczyk, B. K. and Frydén, L. journal:
More informationSound, acoustics Slides based on: Rossing, The science of sound, 1990.
Sound, acoustics Slides based on: Rossing, The science of sound, 1990. Acoustics 1 1 Introduction Acoustics 2! The word acoustics refers to the science of sound and is a subcategory of physics! Room acoustics
More informationOn the function of the violin - vibration excitation and sound radiation.
TMH-QPSR 4/1996 On the function of the violin - vibration excitation and sound radiation. Erik V Jansson Abstract The bow-string interaction results in slip-stick motions of the bowed string. The slip
More informationModeling and Optimizing of the First Guitar Mode
1 Modeling and Optimizing of the First Guitar Mode SAMO ŠALI 1, FREDERIK HINDRYCKX 2 Abstract The first peak in the frequency response function (a ratio between the sound pressure at 1 m from a guitar
More information2 Study of an embarked vibro-impact system: experimental analysis
2 Study of an embarked vibro-impact system: experimental analysis This chapter presents and discusses the experimental part of the thesis. Two test rigs were built at the Dynamics and Vibrations laboratory
More informationBorehole vibration response to hydraulic fracture pressure
Borehole vibration response to hydraulic fracture pressure Andy St-Onge* 1a, David W. Eaton 1b, and Adam Pidlisecky 1c 1 Department of Geoscience, University of Calgary, 2500 University Drive NW Calgary,
More informationModel Correlation of Dynamic Non-linear Bearing Behavior in a Generator
Model Correlation of Dynamic Non-linear Bearing Behavior in a Generator Dean Ford, Greg Holbrook, Steve Shields and Kevin Whitacre Delphi Automotive Systems, Energy & Chassis Systems Abstract Efforts to
More informationThe Physics of Musical Instruments
Neville H. Fletcher Thomas D. Rossing The Physics of Musical Instruments Second Edition With 485 Illustrations Springer Contents Preface Preface to the First Edition v vii I. Vibrating Systems 1. Free
More informationCRITERIA FOR MATHEMATICAL MODEL SELECTION FOR SATELLITE VIBRO-ACOUSTIC ANALYSIS DEPENDING ON FREQUENCY RANGE
CRITERIA FOR MATHEMATICAL MODEL SELECTION FOR SATELLITE VIBRO-ACOUSTIC ANALYSIS DEPENDING ON FREQUENCY RANGE E. Roibás-Millán 1, M. Chimeno-Manguán 1, B. Martínez-Calvo 1, J. López-Díez 1, P. Fajardo,
More informationAcoustic intensity measurement of the sound field radiated by a concert harp
Applied Acoustics 65 (2004) 1221 1231 www.elsevier.com/locate/apacoust Acoustic intensity measurement of the sound field radiated by a concert harp F. Gautier *, N. Dauchez Laboratoire dõ Acoustique delõ
More informationVIBRATIONAL MODES OF THICK CYLINDERS OF FINITE LENGTH
Journal of Sound and Vibration (1996) 191(5), 955 971 VIBRATIONAL MODES OF THICK CYLINDERS OF FINITE LENGTH Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
More informationVibration Fundamentals Training System
Vibration Fundamentals Training System Hands-On Turnkey System for Teaching Vibration Fundamentals An Ideal Tool for Optimizing Your Vibration Class Curriculum The Vibration Fundamentals Training System
More informationVibration Analysis of Anisotropic Plates, Special Case: Violin
Cleveland State University EngagedScholarship@CSU ETD Archive 2013 Vibration Analysis of Anisotropic Plates, Special Case: Violin Chaitanya J. Lomte Cleveland State University How does access to this work
More informationComparison between three different Viennese pianos of the nineteenth century
String Instruments: Paper ICA216-25 Comparison between three different Viennese pianos of the nineteenth century Antoine Chaigne (a), Matthieu Hennet (b), Juliette Chabassier (c), Marc Duruflé (d) (a)
More informationFailure of Engineering Materials & Structures. Code 34. Bolted Joint s Relaxation Behavior: A FEA Study. Muhammad Abid and Saad Hussain
Failure of Engineering Materials & Structures Code 3 UET TAXILA MECHNICAL ENGINEERING DEPARTMENT Bolted Joint s Relaxation Behavior: A FEA Study Muhammad Abid and Saad Hussain Faculty of Mechanical Engineering,
More informationFREE VIBRATION ANALYSIS AND OPTIMIZATION OF STREEING KNUCKLE
FREE VIBRATION ANALYSIS AND OPTIMIZATION OF STREEING KNUCKLE R.Premraj M.Chandrasekar K.Arul kumar Mechanical,Engineering, Sasurie College of Engineering,Tiruppur-638056,India Abstract The main objective
More informationAircraft modal testing at VZLÚ
Aircraft modal testing at VZLÚ 1- Introduction 2- Experimental 3- Software 4- Example of Tests 5- Conclusion 1- Introduction The modal test is designed to determine the modal parameters of a structure.
More informationTime-domain simulation of the bowed cello string: Dual-polarization effect
Time-domain simulation of the bowed cello string: Dual-polarization effect Hossein Mansour, Jim Woodhouse, and Gary Scavone Citation: Proc. Mtgs. Acoust. 19, 035014 (2013); View online: https://doi.org/10.1121/1.4800058
More informationFLUTTER CONTROL OF WIND TUNNEL MODEL USING A SINGLE ELEMENT OF PIEZO-CERAMIC ACTUATOR
24 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES FLUTTER CONTROL OF WIND TUNNEL MODEL USING A SINGLE ELEMENT OF PIEZO-CERAMIC ACTUATOR Naoki Kawai Department of Mechanical Engineering, University
More informationSound absorption and reflection with coupled tubes
Sound absorption and reflection with coupled tubes Abstract Frits van der Eerden University of Twente, Department of Mechanical Engineering (WB-TMK) P.O. Box 27, 75 AE Enschede, The Netherlands f.j.m.vandereerden@wb.utwente.nl
More informationPRO LIGNO Vol. 11 N pp
RHEOLOGICAL BEHAVIOUR OF CURLYMAPLE WOOD (ACER PSEUDOPLATANUS) USED FOR BACK SIDE OF VIOLIN Mariana Domnica STANCIU Transilvania University of Brasov, Faculty of Mechanical Engineering B-dul Eroilor, nr
More informationEnhancing the low frequency vibration reduction performance of plates with embedded Acoustic Black Holes
Enhancing the low frequency vibration reduction performance of plates with embedded Acoustic Black Holes Stephen C. CONLON 1 ; John B. FAHNLINE 1 ; Fabio SEMPERLOTTI ; Philip A. FEURTADO 1 1 Applied Research
More informationFATIGUE CRACK CHARACTERIZATION IN CONDUCTING SHEETS BY NON
FATIGUE CRACK CHARACTERIZATION IN CONDUCTING SHEETS BY NON CONTACT STIMULATION OF RESONANT MODES Buzz Wincheski, J.P. Fulton, and R. Todhunter Analytical Services and Materials 107 Research Drive Hampton,
More informationInfluence of the Cavity Mode on Tire Surface Vibration
Purdue University Purdue e-pubs Publications of the Ray W. Herrick Laboratories School of Mechanical Engineering 9-2011 Influence of the Cavity Mode on Tire Surface Vibration J Stuart Bolton Purdue University,
More informationThe acoustics of mandolins
PAPER The acoustics of mandolins David Cohen and Thomas D. Rossing Physics Department, Northern Illinois University, DeKalb, IL 60115, USA ( Received16 July 2001, Acceptedfor publication 16 May 2002 )
More informationInvestigation of influence of pre-stresses on Viola da Gamba sound using FEM.
Investigation of influence of pre-stresses on Viola da Gamba sound using FEM. Tomasz Jan Wilczyński Faculty of Mechanical Engineering and Robotics, AGH University of Science and Technology, Krakow, Poland.
More informationCHAPTER 5 FAULT DIAGNOSIS OF ROTATING SHAFT WITH SHAFT MISALIGNMENT
66 CHAPTER 5 FAULT DIAGNOSIS OF ROTATING SHAFT WITH SHAFT MISALIGNMENT 5.1 INTRODUCTION The problem of misalignment encountered in rotating machinery is of great concern to designers and maintenance engineers.
More informationTime Reversal FEM Modelling in Thin Aluminium Plates for Defects Detection
ECNDT - Poster 39 Time Reversal FEM Modelling in Thin Aluminium Plates for Defects Detection Yago GÓMEZ-ULLATE, Instituto de Acústica CSIC, Madrid, Spain Francisco MONTERO DE ESPINOSA, Instituto de Acústica
More informationRESEARCH PAPERS FACULTY OF MATERIALS SCIENCE AND TECHNOLOGY IN TRNAVA, SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA, 2016 Volume 24, Number 39
RESEARCH PAPERS FACULTY OF MATERIALS SCIENCE AND TECHNOLOGY IN TRNAVA SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA 2016 Volume 24, Number 39 APPLICATION OF NUMERICAL SIMULATION FOR THE ANALYSIS OF THE
More informationChromatic Patterns of Sounds Waves in Java Applets Coloured Sounds
Chromatic Patterns of Sounds Waves in Java Applets Coloured Sounds STELA DRAGULIN 1, LIVIA SANGEORZAN 2, MIRCEA PARPALEA 3 1 Department of Music 2 Department of Computer Science Transilvania University
More informationSTUDY ON THE QUALITY OF THE SURFACE IN CASE OF MIXED WOOD PANELS
HENRI COANDA AIR FORCE ACADEMY ROMANIA INTERNATIONAL CONFERENCE of SCIENTIFIC PAPER AFASES 2012 Brasov, 24-26 May 2012 GENERAL M.R. STEFANIK ARMED FORCES ACADEMY SLOVAK REPUBLIC STUDY ON THE QUALITY OF
More informationImpact sound insulation: Transient power input from the rubber ball on locally reacting mass-spring systems
Impact sound insulation: Transient power input from the rubber ball on locally reacting mass-spring systems Susumu HIRAKAWA 1 ; Carl HOPKINS 2 ; Pyoung Jik LEE 3 Acoustics Research Unit, School of Architecture,
More information2128. Study of Sarasvati Veena a South Indian musical instrument using its vibro-acoustic signatures
2128. Study of Sarasvati Veena a South Indian musical instrument using its vibro-acoustic signatures Akshay Sundar 1, Hancel P V 2, Pravin Singru 3, Radhika Vathsan 4 BITS Pilani KK Birla Goa Campus, NH
More informationSound Analysis. D. Noon
Sound Analysis D. Noon Last month s topic covered the basic low-frequency (or Signature ) modes of the violin. Now we ll look into how to use computer spectral analysis to find the modes, as well as the
More informationOn the sound production of the timpani
On the sound production of the timpani LAMBERTO TRONCHIN, ALESSIO BUTTAZZONI AND VALERIO TARABUSI DIENCA CIARM, University of Bologna, Italy http://www.ciarm.ing.unibo.it Abstract: - The acoustic features
More informationAN AUTOMATED ALGORITHM FOR SIMULTANEOUSLY DETERMINING ULTRASONIC VELOCITY AND ATTENUATION
MECHANICS. ULTRASONICS AN AUTOMATED ALGORITHM FOR SIMULTANEOUSLY DETERMINING ULTRASONIC VELOCITY AND ATTENUATION P. PETCULESCU, G. PRODAN, R. ZAGAN Ovidius University, Dept. of Physics, 124 Mamaia Ave.,
More informationChapter 19 Hammered Strings
Chapter 19 Hammered Strings Thomas D. Rossing In the next three chapters we consider the science of hammered string instruments. In this chapter, we present a brief discussion of vibrating strings excited
More informationFINITE ELEMENT ANALYSIS OF ACTIVE VIBRATION ISOLATION
FIFTH INTERNATIONAL w CONGRESS ON SOUND AND VIBRATION DECEMBER 15-18, 1997 ADELAIDE, SOUTH AUSTRALIA Invited Paper FINITE ELEMENT ANALYSIS OF ACTIVE VIBRATION ISOLATION Carl Q. Howard and Colin H. Hansen
More informationExamination of Organ Flue Pipe Resonator Eigenfrequencies by Means of the Boundary Element Method
Examination of Organ Flue Pipe Resonator Eigenfrequencies by Means of the Boundary Element Method Gábor Szoliva Budapest University of Technology and Economics, Department of Telecommunications, H-1117
More informationExperimental Investigation of Crack Detection in Cantilever Beam Using Natural Frequency as Basic Criterion
INSTITUTE OF TECHNOLOGY, NIRMA UNIVERSITY, AHMEDABAD 382 481, 08-10 DECEMBER, 2011 1 Experimental Investigation of Crack Detection in Cantilever Beam Using Natural Frequency as Basic Criterion A. A.V.Deokar,
More informationNON CONTACT VIBRATION MEASUREMENTS ON PARABOLIC SURFACE ANTENNA. Dorin Simoiu 1, Liviu Bereteu 1
Analele Universităţii de Vest din Timişoara Vol. LVII, 2013 Seria Fizică NON CONTACT VIBRATION MEASUREMENTS ON PARABOLIC SURFACE ANTENNA Dorin Simoiu 1, Liviu Bereteu 1 1 Mechanical and Vibration Department,
More informationDetermination of the width of an axisymmetric deposit on a metallic pipe by means of Lamb type guided modes
Acoustics 8 Paris Determination of the width of an axisymmetric deposit on a metallic pipe by means of Lamb type guided modes M. El Moussaoui a, F. Chati a, F. Leon a, A. Klauson b and G. Maze c a LOMC
More informationModal Analysis of a Trapezoidal Violin Built after the Description of Félix Savart
ARCHIVES OF ACOUSTICS Vol.39,No.4, pp.623 628(2014) Copyright c 2014byPAN IPPT DOI: 10.2478/aoa-2014-0067 Modal Analysis of a Trapezoidal Violin Built after the Description of Félix Savart TimDUERINCK
More informationRECENTLY DESIGNED BOW-STRING RAILWAY BRIDGES IN SLOVAKIA
RECENTLY DESIGNED BOW-STRING RAILWAY BRIDGES IN SLOVAKIA Josef Vican *, Jaroslav Odrobinak * & Jozef Gocal * * University of Zilina, Faculty of Civil Engineering, Zilina, Slovakia josef.vican@fstav.uniza.sk,
More informationEWGAE 2010 Vienna, 8th to 10th September
EWGAE 2010 Vienna, 8th to 10th September Frequencies and Amplitudes of AE Signals in a Plate as a Function of Source Rise Time M. A. HAMSTAD University of Denver, Department of Mechanical and Materials
More informationReed chamber resonances and attack transients in free reed instruments
PROCEEDINGS of the 22 nd International Congress on Acoustics Wind Instruments: Paper ICA2016-748 Reed chamber resonances and attack transients in free reed instruments James Cottingham (a) (a) Coe College,
More informationWhat You Can Find Out By Hitting Things. And a bunch of other stuff I ve been doing lately that may or may not be interesting
What You Can Find Out By Hitting Things And a bunch of other stuff I ve been doing lately that may or may not be interesting Don Noon Oberlin Acoustics 2011 Since wood properties are very important to
More informationPhysics of Music Projects Final Report
Physics of Music Projects Final Report John P Alsterda Prof. Steven Errede Physics 498 POM May 15, 2009 1 Abstract The following projects were completed in the spring of 2009 to investigate the physics
More informationENHANCEMENT OF THE TRANSMISSION LOSS OF DOUBLE PANELS BY MEANS OF ACTIVELY CONTROLLING THE CAVITY SOUND FIELD
ENHANCEMENT OF THE TRANSMISSION LOSS OF DOUBLE PANELS BY MEANS OF ACTIVELY CONTROLLING THE CAVITY SOUND FIELD André Jakob, Michael Möser Technische Universität Berlin, Institut für Technische Akustik,
More informationDirection-Dependent Physical Modeling of Musical Instruments
15th International Congress on Acoustics (ICA 95), Trondheim, Norway, June 26-3, 1995 Title of the paper: Direction-Dependent Physical ing of Musical Instruments Authors: Matti Karjalainen 1,3, Jyri Huopaniemi
More informationRayleigh Wave Interaction and Mode Conversion in a Delamination
Rayleigh Wave Interaction and Mode Conversion in a Delamination Sunil Kishore Chakrapani a, Vinay Dayal, a and Jamie Dunt b a Department of Aerospace Engineering & Center for NDE, Iowa State University,
More informationVeröffentlichungen am IKFF PIEZOELECTRIC TRAVELLING WAVE MOTORS GENERATING DIRECT LINEAR MOTION
Veröffentlichungen am IKFF PIEZOELECTRIC TRAVELLING WAVE MOTORS GENERATING DIRECT LINEAR MOTION M. Hermann, W. Schinköthe (IKFF) Beitrag zur Actuator 96 Bremen 26. - 28.06.96 Conference Proceedings, S.
More informationA GENERIC SHELL MODEL FOR INSTRUMENTS OF THE VIOLIN FAMILY
A GENERIC SHELL MODEL FOR INSTRUMENTS OF THE VIOLIN FAMILY CE Gough School of Physics and Astronomy, University of Birmingham, B15 2TT, UK. 1 INTRODUCTION A number of simple models have been introduced
More informationScattering Parameters for the Keefe Clarinet Tonehole Model
Presented at the 1997 International Symposium on Musical Acoustics, Edinourgh, Scotland. 1 Scattering Parameters for the Keefe Clarinet Tonehole Model Gary P. Scavone & Julius O. Smith III Center for Computer
More informationResonant characteristics of flow pulsation in pipes due to swept sine constraint
TRANSACTIONS OF THE INSTITUTE OF FLUID-FLOW MACHINERY No. 133, 2016, 131 144 Tomasz Pałczyński Resonant characteristics of flow pulsation in pipes due to swept sine constraint Institute of Turbomachinery,
More informationDESIGN, CONSTRUCTION, AND THE TESTING OF AN ELECTRIC MONOCHORD WITH A TWO-DIMENSIONAL MAGNETIC PICKUP. Michael Dickerson
DESIGN, CONSTRUCTION, AND THE TESTING OF AN ELECTRIC MONOCHORD WITH A TWO-DIMENSIONAL MAGNETIC PICKUP by Michael Dickerson Submitted to the Department of Physics and Astronomy in partial fulfillment of
More informationPredicting and measuring non-linear behaviour at spacecraft level NAFEMS France Conference
Predicting and measuring non-linear behaviour at spacecraft level NAFEMS France Conference June the 8th, 2011 Laurent SOULA (ASTRIUM Satellite France) Alfred Newerla (ESTEC) Agenda Purpose of the study
More informationAN ADAPTIVE VIBRATION ABSORBER
AN ADAPTIVE VIBRATION ABSORBER Simon Hill, Scott Snyder and Ben Cazzolato Department of Mechanical Engineering, The University of Adelaide Australia, S.A. 5005. Email: simon.hill@adelaide.edu.au 1 INTRODUCTION
More informationSystem Inputs, Physical Modeling, and Time & Frequency Domains
System Inputs, Physical Modeling, and Time & Frequency Domains There are three topics that require more discussion at this point of our study. They are: Classification of System Inputs, Physical Modeling,
More informationKeywords: Bracing bracket connection, local deformation, selective pallet racks, shear stiffness, spine bracings.
Send Orders for Reprints to reprints@benthamscience.ae The Open Construction and Building Technology Journal, 2015, 9, 1-6 1 Open Access Investigation of Shear Stiffness of Spine Bracing Systems in Selective
More informationStudies on free vibration of FRP aircraft Instruments panel boards
89 Studies on free vibration of FRP aircraft Instruments panel boards E. Chandrasekaran Professor in Dept. of Civil Engineering, Crescent Engineering College 648 India. e-mail: sekharan@vsnl.net and K.
More informationREFLECTION AND TRANSMISSION OF LAMB WAVES AT DISCONTINUITY IN PLATE Z. Liu NDT Systems & Services AG, Stutensee, Germany
REFLECTION AND TRANSMISSION OF LAMB WAVES AT DISCONTINUITY IN PLATE Z. Liu NDT Systems & Services AG, Stutensee, Germany Abstract: Lamb waves can be used for testing thin plate and pipe because they provide
More informationINFLUENCE OF PILES ON LOAD- SETTLEMENT BEHAVIOUR OF RAFT FOUNDATION
INFLUENCE OF PILES ON LOAD- SETTLEMENT BEHAVIOUR OF RAFT FOUNDATION BALESHWAR SINGH Department of Civil Engineering Indian Institute of Technology Guwahati Guwahati 78139, India NINGOMBAM THOIBA SINGH
More informationULTRASONIC GUIDED WAVES FOR AGING WIRE INSULATION ASSESSMENT
ULTRASONIC GUIDED WAVES FOR AGING WIRE INSULATION ASSESSMENT Robert F. Anastasi 1 and Eric I. Madaras 2 1 U.S. Army Research Laboratory, Vehicle Technology Directorate, AMSRL-VT-S, Nondestructive Evaluation
More informationFREE AND FORCED VIBRATION EXPERIMENTS ON A CROSSBEAM SYSTEM
Proceedings of the International Conference on Mechanical Engineering 2009 (ICME2009) 26-28 December 2009, Dhaka, Bangladesh ICME09- FREE AND FORCED VIBRATION EXPERIMENTS ON A CROSSBEAM SYSTEM Anirban
More informationAbout the High-Frequency Interferences produced in Systems including PWM and AC Motors
About the High-Frequency Interferences produced in Systems including PWM and AC Motors ELEONORA DARIE Electrotechnical Department Technical University of Civil Engineering B-dul Pache Protopopescu 66,
More informationMonitoring The Machine Elements In Lathe Using Vibration Signals
Monitoring The Machine Elements In Lathe Using Vibration Signals Jagadish. M. S. and H. V. Ravindra Dept. of Mech. Engg. P.E.S.C.E. Mandya 571 401. ABSTRACT: In any manufacturing industry, machine tools
More informationMODEL MODIFICATION OF WIRA CENTER MEMBER BAR
MODEL MODIFICATION OF WIRA CENTER MEMBER BAR F.R.M. Romlay & M.S.M. Sani Faculty of Mechanical Engineering Kolej Universiti Kejuruteraan & Teknologi Malaysia (KUKTEM), Karung Berkunci 12 25000 Kuantan
More informationDIFFERENT SOUND WAVES THROUGH THE JUNCTION BETWEEN THE TWO FLOOR PLATES
DIFFERENT SOUND WAVES THROUGH THE JUNCTION BETWEEN THE TWO FLOOR PLATES Vytautas J. Stauskis Vilnius Gediminas Technical University, Pylimo 6/Traku, LT, Vilnius, Lithuania. E-mail: stauskis@vgtu.lt Abstract.
More informationPreliminary study of the vibration displacement measurement by using strain gauge
Songklanakarin J. Sci. Technol. 32 (5), 453-459, Sep. - Oct. 2010 Original Article Preliminary study of the vibration displacement measurement by using strain gauge Siripong Eamchaimongkol* Department
More informationFrequency Capture Characteristics of Gearbox Bidirectional Rotary Vibration System
Frequency Capture Characteristics of Gearbox Bidirectional Rotary Vibration System Ruqiang Mou, Li Hou, Zhijun Sun, Yongqiao Wei and Bo Li School of Manufacturing Science and Engineering, Sichuan University
More informationResonant Frequency Analysis of the Diaphragm in an Automotive Electric Horn
Resonant Frequency Analysis of the Diaphragm in an Automotive Electric Horn R K Pradeep, S Sriram, S Premnath Department of Mechanical Engineering, PSG College of Technology, Coimbatore, India 641004 Abstract
More informationMay 2008 Discrete-Time Simulation of Percussive String Instruments
Supervisor: Dr Maarten van Walstijn May 008 Discrete-Time Simulation of Percussive String Instruments FINAL YEAR PROJECT 007/008 Siobhan Neill 14705036 Queen's University of Belfast - ii - Abstract The
More informationSelective Excitation of Lamb Wave Modes in Thin Aluminium Plates using Bonded Piezoceramics: Fem Modelling and Measurements
ECNDT 6 - Poster 5 Selective Excitation of Lamb Wave Modes in Thin Aluminium Plates using Bonded Piezoceramics: Fem Modelling and Measurements Yago GÓMEZ-ULLATE, Francisco MONTERO DE ESPINOSA, Instituto
More informationconstructive interference results when destructive interference results when two special interference patterns are the and the
Interference and Sound Last class we looked at interference and found that constructive interference results when destructive interference results when two special interference patterns are the and the
More informationQuantitative Crack Depth Study in Homogeneous Plates Using Simulated Lamb Waves.
More Info at Open Access Database www.ndt.net/?id=18675 Quantitative Crack Depth Study in Homogeneous Plates Using Simulated Lamb Waves. Mohammad. (. SOORGEE, Aghil. YOUSEF)-KOMA Nondestructive Testing
More informationsin(wt) y(t) Exciter Vibrating armature ENME599 1
ENME599 1 LAB #3: Kinematic Excitation (Forced Vibration) of a SDOF system Students must read the laboratory instruction manual prior to the lab session. The lab report must be submitted in the beginning
More informationEXPERIMENTAL INVESTIGTION OF THE FRETTING PHENOMENON-DEPENDENCE OF NUMBERS CYCLES
EXPERIMENTAL INVESTIGTION OF THE FRETTING PHENOMENON-DEPENDENCE OF NUMBERS CYCLES ŞTEFAN GHIMIŞI, Constantin Brâncuşi University of Târgu Jiu, Romania,ghimisi@utgjiu.ro Abstract: Fretting damage is often
More informationACTIVE CONTROL OF GEARS MODULATED VIBRATIONS IN MECHATRONICS SYSTEMS
U.P.B. Sci. Bull., Series D, Vol. 73, Iss. 2, 2011 ISSN 1454-2358 ACTIVE CONTROL OF GEARS MODULATED VIBRATIONS IN MECHATRONICS SYSTEMS Barbu DRĂGAN 1, Carmen BUJOREANU 2 Studiul controlului activ al vibraţiilor
More informationThe on-line detection of moisture and coatings by means of thermal waves. by R. Huttner and E. Schollmeyer
The on-line detection of moisture and coatings by means of thermal waves moist by R. Huttner and E. Schollmeyer Oeutsches Texfilforschungszentrum Nord-West e. V., Institut an der Universitat Ouisburg Gesamthochschule,
More informationMode Dispersion Curves
Mode Dispersion Curves Fluid-Filled Pipe using FEM George Grigoropoulos Civil Engineer, MSc. g.grigoropoulos@gmail.com Department of Civil and Environmental Engineering Hong Kong University of Science
More informationAn Investigation of Optimal Pitch Selection to Reduce Self-Loosening of Threaded Fastener under Transverse Loading
IJSTE - International Journal of Science Technology & Engineering Volume 3 Issue 01 July 2016 ISSN (online): 2349-784X An Investigation of Optimal Pitch Selection to Reduce Self-Loosening of Threaded Fastener
More informationGear Noise Prediction in Automotive Transmissions
Gear Noise Prediction in Automotive Transmissions J. Bihr, Dr. M. Heider, Dr. M. Otto, Prof. K. Stahl, T. Kume and M. Kato Due to increasing requirements regarding the vibrational behavior of automotive
More informationNovel Designer Plastic Trumpet Bells for Brass Instruments
http://dx.doi.org/1.14236/ewic/eva216.3 Novel Designer Plastic Trumpet Bells for Brass Instruments Birmingham City University Faculty of Computing, Engineering and the Built Environment Millennium Point,
More information2. When is an overtone harmonic? a. never c. when it is an integer multiple of the fundamental frequency b. always d.
PHYSICS LAPP RESONANCE, MUSIC, AND MUSICAL INSTRUMENTS REVIEW I will not be providing equations or any other information, but you can prepare a 3 x 5 card with equations and constants to be used on the
More information