R. Sisto, L. Cerini, D. Mambro, A. Moleti, F. Sanjust
INAIL Research, Monteporzio Catone, Italy
Università di Roma, Tor Vergata, Italy
The otoacoustic emissions (OAEs) are acoustic signals emitted by the inner ear as a consequence of the activity of a nonlinear feedback mechanism capable of amplifying the signal near to the hearing threshold level. The otoacoustic emissions can be used as an acoustic imaging of the cochlear functionality. They are used in clinics for screening purposes but due to the extreme variability between ...
E. Nesvijski[1,2], R. Sahul
Western New England College, Springfield, MA, USA
TRS Technologies, State College, PA, USA
Finite element analysis (FEA) is a modern tool for exploration of new horizons in science, technology and engineering. Different computer software such as ANSYS, ABACUS, PZFLEX and COMSOL Multiphysics® based on FEA are used for modeling and simulation of acoustic phenomena, for design of new and optimization and improvement of existing acoustic engineering systems. This work presents application ...
Design of a MEMS Resonator for a Centre Frequency Greater than 26.35 MHz and Temperature Coefficient Frequency Less than 0.5 ppm
S.Manikandan, R.Radeep krishna
Kalasalingam University, Department of ECE, Srivilliputtur ,Krishnan koil, Tamil Nadu, India
The variability of the design parameters caused by material properties like thermal conductivity is the major challenge in Micro Electromechanical System (MEMS). In resonator design the basic problem is that the frequency changes with temperature variation and quantitative explanation with respect to this varies. The change can be attributed to the stability in terms of frequency drift in parts ...
M. Swamy, L. J. van Lier, J. Smeulers
TNO, Delft, The Netherlands
In one of the screw compressor system, designed silencer was not optimal. A great challenge was the large variation in operating conditions, especially the variation of the molecular weight of the gas. There was need to optimize the silencer. This paper describes the acoustic modelling tools to optimize the acoustic performance of the silencer. Optimization steps carried out are based on the ...
Simulation of Helmholtz Resonators for Optical Gas Sensing: Comparison Between Pressure Acoustics and Thermoacoustics - new
B. Parvitte, C. Risser, R. Vallon, V. Zéninari
Université de Reims, Reims, France
Among optical gas sensing methods, photoacoustic (PA) spectroscopy combined with a laser source has proven to be a very robust and sensitive method for trace gas detection. COMSOL Multiphysics® software was used to calculate the frequency response of differential Helmholtz resonator cells in order to optimize the detection limit of PA sensors. Two different kind of simulation were performed: ...
R. Sugumar, C. S. Kumar, T. K. Datta
Sharda University, Greater Noida, Uttar Pradesh, India
MVN University, Palwal, Haryana, India
Indian Institute of Technology Delhi, New Delhi, Delhi, India
Earthquakes have always been a threat to the safety of buildings, sometimes even causing fatality due collapse of the structure. Various methods have evolved in the recent past to control/reduce the response of a structure subjected to earthquake forces. One of the widely used passive control methods is Base Isolation System. This paper discusses the study of the response of the base isolated ...
G. Campa and S.M. Camporeale
DIMEG, Politecnico di Bari, Bari, Italy
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 heat released by the flame. This paper presents a novel numerical method in which the governing equations of the acoustic waves are coupled with a flame heat ...
E. Gutierrez-Miravete, E.R. Marderness
Rensselaer Polytechnic Institute, Hartford, CT, USA
General Dynamics-Electric Boat, Groton, CT, USA
Industrial fluid systems often involve continuous piping loops. These systems consist of varying lengths of pipes and hoses connecting multiple components together. Fluid resonances can detrimentally affect the operation of fluid systems and components. This work used COMSOL to investigate the frequency and mode shapes of axial fluid resonances within a system of piping and components that form ...
Karthi Pradeep, G. Suresh, V. Natarajan,
National Institute of Technology, Tiruchirappalli, Kerala, India
Naval Physical & Oceanographic Laboratory (NPOL), Kochi, Kerala, India
A Helmholtz resonator type acoustic sensor has been designed using analytical method and finite element modeling software, COMSOL Multiphysics®. The acoustic sensor is an aluminium double frustum, hour glass, shaped with the resonator at the bottom and an acoustic horn above to amplify the incoming acoustic signal. The horn provides a broad amplification of the incoming acoustic signal while the ...
S. De Paolis, F. Lionetto, and A. Maffezzoli
Department of Innovation Engineering, University of Salento, Lecce, Italy
Finite element analysis has been used to model the ultrasonic wave propagation both in a custom made transducer and in the tested polymer sample. The model consists of acoustic (passive elements) and electroacoustic (active elements) transmission lines. The simulation of the acoustic propagation accounts for the interaction between the transducer and the materials in the buffer rods, and the ...