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Acoustics

	3-D Finite Element Modeling of a Nanostructure Enhanced SAW Sensor Integration of surface acoustic wave (SAW) devices with nanostructures has gained interest in the development of sensors with high sensitivity. To better design nanostructure integrated SAW devices, it is essential to model three... COMSOL Conference 2006, Boston Y.L. Rao¹ , and G. Zhang^1-3 ¹ Micro/Nano Bioengineering Laboratory, Department of Biological and Agricultural Engineering, The University of Georgia ² Nanoscale Science and Engineering Center, The University of Georgia ³ Faculty of Engineering, The University of Georgia
	Accuracy of Fully Coupled Loudspeaker Simulation Using COMSOL Loudspeaker simulation is used to inform the designer as to the performance of a design. In recent years the Finite Element Method (FEM) has been used to model the mechanical and acoustical attributes of a loudspeaker with varying... COMSOL Conference 2009, Milan M. Hedges¹ ² and Y.W. Lam¹ ¹ Acoustics Research Centre, School of Computing, Science & Engineering, University of Salford, Salford, United Kingdom ² Monitor Audio Ltd., Rayleigh, Essex, United Kingdom
	Acoustic Attenuation Performance Of Helicoidal Resonator Due To Distance Change From Different Cross-Sectional Elements Of Cylindrical Duct This work presents acoustic attenuation performance of helicoidal resonator due to distance change from different cross-sectional elements of cylindrical duct. The helicoidal resonator properties are described mainly in in infinite long... COMSOL Conference 2010, Paris W. Łapka Poznań University of Technology, Poznań, Poland
	Acoustic Emission Simulation for Online Impact Detection Impact monitoring has been extensively studied by several researchers and it has been shown that damage extent can be correlated with the impact magnitude. In order to make the process cost-effective, simulation of the impact has been... COMSOL Conference 2011, Stuttgart C. Yang, M. A. Torres-Arredondo, and C.-P. Fritzen Institute of Mechanics and Control Engineering Mechatronics University of Siegen Siegen, Germany
	Acoustic Transparency of Non-homogeneous Plates (with repeating inclusions) using Periodic Structures Methodology The paper addresses a class of problems for determining the acoustic interaction of time-harmonic plane waves impinging upon submerged elastic plates (fluid backed or void backed), that are infinite in extent.The plates can have repeated... COMSOL Conference 2007, Boston A. J. Kalinowski Naval Undersea Warfare Center/Div. Npt. Newport, RI, USA
	A Directional Dogbone Flextensional Sonar Transducer In order to transmit energy in one direction, sonar flextensional transducers are combined into arrays of elements that are spaced a 1/4 wavelength apart. The directionality (front-to-back pressure ratio) is a modest of 6 dB. A single... COMSOL Conference 2010, Boston S.C. Butler Naval Undersea Warfare Center, Newport, RI, USA
	A Domain Decomposition Algorithm for Dissipative or non Dissipative Acoustic Cavities This note is devoted to a domain decomposition method solving the Helmholtz equation in the frequency domain. We need to perform this global computation as a sequence of local computations, each computation being performed on a single... COMSOL Conference 2005, Boston Balabane M. University Paris 13 - Math. dpt.
	AlN/ZnO/Silicon Structure Combining Surface Acoustic Waves And Waveguiding Layer Acoustic Wave In this work, the theoretical study for the realization of waveguiding layer acoustic waves devices based on AlN/IDT/ZnO/Silicon structure using the modeling software COMSOL Multiphysics (2D) is presented. The effect of thicknesses of... COMSOL Conference 2010, Paris O. Legrani¹ , O. Elmazria¹ , S. Zhgoon ² , L. Le Brizoual³ , and A. Bartasyte¹ ¹ Institut Jean Lamour, CNRS-Nancy University, Vandoeuvre lès Nancy, France ² Moscow Power Engineering Institute, Krasnokazarmennaja, Moscow, Russia ³ Institut des Matériaux Jean Rouxel, Université Nantes, CNRS, Nantes, France
	A MEMS Condenser Microphone for Consumer Applications The MEMS microphone is also called microphone chip or silicon microphone. The pressure sensitive diaphragm is etched directly into a silicon chip by MEMS techniques and is usually accompanied with integrated preamplifier. Most MEMS... COMSOL Conference 2011, Bangalore S. L. Pinjare, V. S. Nagaraj, S. N. Savitha, S. Kesari, M. S. Sagar, and K. R. Roshan Nitte Meenakshi Institute of Technology
	An Acoustical Finite Element Model of Perforated Elements The present work deals with a numerical investigation of resonating systems used for noise control applications. In literature one can find analytical models based on fluiddynamics concepts for evaluating losses occurring across the holes... COMSOL Conference 2009, Milan P. Bonfiglio¹ ² and F. Pompoli¹ ² ¹ Materiacustica S.r.l., Ferrara, Italy ² Engineering Department, University of Ferrara, Ferrara, Italy
	Analysis of Acoustic Response of Rooms The preferred acoustic response of recording studios, auditoriums and conference halls is to have an even energy response over the entire room and throughout full audio spectrum. This can be accomplished by using acoustic panels with... COMSOL Conference 2010, Boston J.S. Crompton¹ , L.T. Gritter¹ , S. Yushanov¹ , K.C. Koppenhoefer¹ , and D. Magyari² ¹ AltaSim Technologies, LLC, Columbus, OH, USA ² Golden Acoustics, Detroit, MI, USA
	Analysis of Sound Propagation in Lined Ducts by Means of a Finite Element Model The present paper describes the results of a Finite Element Model used to analyze sound propagation in lined ducts. By means of a numerical model it was possible to predict the insertion loss inside rectangular lined ducts in a frequency... COMSOL Conference 2009, Milan D. Borelli¹ and C. Schenone¹ ¹ DIPTEM, University of Genova, Genova, Italy
	Analysis of the Acoustic Response of a Railroad Bridge Aging infrastructure requires frequent inspections to assess their structural integrity. However, the large amount of existing infrastructure, and the distance between these structures present significant challenges to inspectors.... COMSOL Conference 2009, Boston K. Koppenhoefer¹ , S.Yushanov¹ , and M.H. McKenna² ¹ AltaSim Technologies, LLC, Columbus, Ohio, USA ² U.S. Army Engineering Research and Development Center
	Analyzing Muffler Performance Using the Transfer Matrix Method Exhaust noise must meet legislation targets, customer expectations and cost reduction which call for design optimization of the exhaust systems in the design phase. One solution is to use 3 dimensional linear pressure acoustics and... COMSOL Conference 2008, Hannover K. Andersen Dinex Emission Technology A/S, Middelfart, Denmark
	A Novel FEM Method for Predicting Thermoacoustic Combustion Instability Modern gas turbines suffer of the phenomenon of combustion instability, also known as “humming”. The main origin of the instability is considered to be related to the interaction between acoustic waves and fluctuations of the... COMSOL Conference 2009, Milan G. Campa¹ and S.M. Camporeale¹ ¹ DIMEG, Politecnico di Bari, Bari, Italy
	Application of COMSOL to Acoustic Imaging Acoustic Imaging of hand movement is being studied with COMSOL and Matlab. A hardware implementation is being pursued that will be an array of 16x16 ultra-sonic speakers placed in a grid facing a similar grid of 16x16 microphones,... COMSOL Conference 2010, Boston K. Mcilhany, and J.C Hernandez U.S. Naval Academy, Annapolis, MD, USA
	Application of Transfer Matrix Method in Acoustics The Transfer Matrix method in the Acoustics Module of COMSOL Multiphysics is used when the whole system can be represented into a sequence of subsystems that interact only with adjacent subsystems. This method is frequently used in... COMSOL Conference 2010, Paris G. Campa, and S.M. Camporeale Politecnico di Bari, Bari, Italy
	A Study of FEMLAB for Modeling High Frequency Ultrasound Scattering by Spherical Objects Analytical solutions to the problem of wave scattering from three dimensional structures such as spheres have been studied extensively in the past. However, these solutions are not flexible enough to be extended to wave scattering from... COMSOL Conference 2005, Boston Falou, O.1, Kumaradas, J.C.2, Kolios, M.C.3 1 Dept. of Electrical and Computer Engineering, Ryerson University, ON, Canada 2 Dept. of Electrical and Computer Engineering & Dept. of Physics, Ryerson University, ON, Canada 3 Dept. of Physics, Ryerson University, ON, Canada
	A Study of Seismic Robot Actuation Using COMSOL Multiphysics Microrobotics has promising applications in microsurgery and microassembly. A challenge in these systems is interfacing with the robot. This project explores crawling robots that are powered and controlled through a global mechanical... COMSOL Conference 2010, Boston S.L. Firebaugh, E.A. Leckie, J.A. Piepmeier, and J.A. Burkhardt United States Naval Academy, Annapolis, Maryland, USA
	A Study of the Acoustic Response of Carbon Fiber Reinforced Plastic Plates This paper gives an introduction to a continuing study detailing the process and development of using both experimental and Finite Element Analysis to characterise the acoustic response of a Carbon Fiber Reinforced Plastic (CFRP) laminate... COMSOL Conference 2011, Stuttgart J. O'Donnell, and G. McRobbie University of the West of Scotland Paisly, United Kingdom

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Acoustics