D. M. Forrester ,
 Loughborough University, Loughborough, United Kingdom
When the particles in a colloid come close to each other, multiple scattering in ultrasonic beams is no longer negligible and crowded particle effects emerge. The presence of each particle affects the scattering of all others, leading to coupling effects. We investigate the interaction of a range of sizes of particles, arranged periodically or randomly (in medium to high ultrasonic frequency ...
R. C. Thiagarajan
ATOA Technologies, Bangalore, India.
Multiphysics acoustics is increasingly used to design products to meet sound, ultrasound and infrasound and other structural, thermal, electromagnetic requirements. In this paper, Multiphysics Acoustical applications such as digital stethoscope, glazing products and acoustical metamaterials are detailed. Stethoscopes are in use for more than 200 years for medical diagnostics, especially for ...
K. McIlhany, and R. Malek-Madani
Physics Department, United States Naval Academy, Annapolis, MD, USA
Mathematics Department, United States Naval Academy, Annapolis, MD, USA
In 1966, mathematician Mark Kac proposed the question "Can One Hear the Shape of a Drum?" in an article for American Mathematical Monthly. In attempting to resolve the Chesapeake Bay from an eigenfunctional approach, a one-to-one mapping of this famous problem has been identified. The quote above will re-write to "Can One Hear the Shape of a Drum from Multiple Point-Sampled Spectra?". This ...
R. Singh, M. Singh
National Institute of Technology Karnataka, Surathkal, Karnataka, India
Indian Institute of Technology Delhi, New Delhi, Delhi, India
Today, MEMS based accelerometers are used in a variety of applications. To name a few, they are used in safety systems in automobiles, it has added a new dimension to miniaturization of devices, it has replaced traditional piezoelectric accelerometers, which were big and difficult to use. For its various applications, differing bandwidth (operating frequency range) and amplitude of vibration are ...
Acoustic Attenuation Performance Of Helicoidal Resonator Due To Distance Change From Different Cross-Sectional Elements Of Cylindrical Duct
Poznań University of Technology, Poznań, Poland
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 cylindrical duct. For practical applications it is important to know the limits of use of this solution. This paper describes how the helicoidal resonator should ...
Beam Structure As an Acoustic Wave Sensor: A Study of the Effect of Sensor Design on Its Sensitivity to Noise
F. Akasheh, A. Biddle, W.S. Shepard Jr., and B.B.B. Zhang
Tuskegee University, Tuskegee, AL, USA
University of Alabama, Tuscaloosa, AL, USA
The detection and identification of the location of a sound source is commonly done using arrays of microphones. A recent new alternative approach has been proposed which involves the use of continuous structures, such as beams or plates, as acoustic wave sensors. The sound wave impinging on the surface of the structure causes it to vibrate and the measured surface displacements can then be used ...
H. Zhang, W. Lin, and X. Wang
Chinese Academy of Sciences, Institute of Acoustics, Beijing, China
Acoustical well logging is an important technology for petroleum industry. Calibration and testing of tools in real wells is not feasible because the cost is high and the condition is not controllable. During manufacturing and maintaining, the logging tools are usually tested in a fluid filled circular pipe. The acoustic field in non-circular wells are calculated by using of the PDE mode of ...
Dr. Shekhawat is currently the General Manager for New Products Development at Secure Meters Ltd., Udaipur. Prior to this, he was with CEERI, Pilani for 23 years. He has a Ph.D., MS, M. Sc. (Physics) and BE (EEE) from BITS, Pilani. He is the recipient of several honours including the DAAD Fellowship, Germany and National Science Talent Fellowship. His areas of research include Ultrasonic ...
M. M. Ghulam , E. J. Gutmark ,
 Aerospace Department, University of Cincinnati, Cincinnati, OH, USA
COMSOL analysis of the acoustic modes of two different Combustion Wind Tunnel Facility’s test sections was conducted in this project. The test sections are rectangular ducts, therefore the mathematical expressions to predict the longitudinal and transverse modes inside a tube were used and compared with COMSOL simulations. Three different cases with different boundary conditions were simulated ...
Time Domain Construction of Acoustic Scattering by Elastic Targets Through Finite Element Analysis - new
A. Gunderson , B. Simon , A. Bonomo , M. Isakson ,
 Applied Research Laboratories, University of Texas - Austin, Austin, TX, USA
Finite element models for acoustic scattering from three dimensional underwater elastic objects, calculated in the frequency domain, are transformed to the time domain through Fourier synthesis using COMSOL Multiphysics®. The time domain mirrors the way in which experimental scattering data from real targets is acquired. Fluid elements are modeled using built-in physics in COMSOL’s acoustics ...