NISA/ACOUSTICS

NISA/ACOUSTICS is a boundary element based program to solve real life acoustics/vibration prblems encountered in every day engineered products. It can be used to reduce the noise levels radiating from engines, predict the resonant frequency in an automobile or airplane cabin, calculate the sound pressure in the fuselage of an airplane due to the sound transmission from proprellers or jet engines. Currently program supports only quadratic elements. It is also linked with the frequency response analysis capability of the general purpose finite element analysis program, NISA II. Following capabilities are available in the current version:

* Sound radiation in infinite and seni-infinite space

* Sound scattering in infinite space

* Sound transmission analysis

* Natural frequency (eigenvalue) analysis of the cavities

The capabilities planned for the next release are:

* Sound structure interaction analysis (coupled analysis)

* Sound absorbing materials

* Multi acoustic problems

The results can be post-processing using EMRC's graphics program, DISPLAY III. The output quantities include: acoustic, pressure, velocity, sound pressure level (SPL), directivity plots, surface radiation efficiency, sound power, sound intensity and frequency response plots.

Kant S. Kothawala, Ph.D.

President & CEO