A noise abatement method using an eigen function in conjunction with optimizer (Genetic Algorithm) under a space-constrain situation is proposed this study concerning high order wave propagation effect. An used to describe acoustical field and shorten the model four-pole transfer matrix form. The system’s estimates Transmission Loss (TL) for silencers by multiplying individual matrices.

The method of fundamental solutions (MFS) has been proved to be an accurate and efficient meshless numerical method to solve acoustic eigenproblems. Traditionally, the technique of the singular value decomposition (SVD) is employed to obtain the corresponding contours of acoustical modes after the eigenvalues are solved. However, it is found that the mode shapes are sensitive to the source loca...

Hearing loss is a relatively common disorder. Detailed analyses of the mechanical and acoustical properties of the middle ear have significant clinical implications. The finite-element method is a powerful tool, often used for such analysis. A comprehensive and reliable 3-D finite-element model of the human middle ear can provide a better understanding of the biomechanics of its many interrelat...

We developed a new method based on functional integration to treat the dynamics of polarons in one-dimensional systems. We treat the acoustical and the optical case in an unified manner, showing their differences and similarities. The mobility and the diffusion coefficients are calculated in the Markovian approximation in the strong coupling limit.

This paper considers a time domain ultrasonic tomographic imaging method in a multi-static configuration using the propagation and backpropagation (PBP) method. Under this imaging configuration, ultrasonic excitation signals from the sources probe the object imbedded in the surrounding medium. The scattering signals are recorded by the receivers. Starting from the nonlinear ultrasonic wave prop...

Field studies on traffic noise-induced annoyance have predominantly used estimated outside noise levels. We intended to complement existing knowledge with exposure–response relationships that are based precise indoor measurements. Acoustic recordings inside the bedrooms of nightly road and ratings in following morning were obtained from 40 suburban residents (mean age 29.1 years ± 11.7; 26 fema...