Identification of unknown vibrating pressures in a three-chamber unit using a Computational Inverse Acoustics Method

Knowing the properties of vibrating systems is essential in design, controlling and reducing undesirable vibration. Direct measurements in some cases are dangerous or difficult; therefore, several other methods such as Near Field Acoustical Holography, Acoustic Array Techniques, Acoustic Transfer Matrix and Inverse Numerical Acoustics are recommended. This paper aims to provide an efficient method using Computational Inverse Acoustics to identify time history of applied pressures in a vibrating structure by measuring pressure at several points near the structure in surrounding air. This procedure is based on inverse analysis and pre-, during- and post-analysis regularizations are used to reduce the amount of the errors. Computational Inverse Acoustics Method can use in situations that the locations of applied pressures are out of reach, have a high temperature or have a special shape. To solve the problem, variety of different subjects such as acoustics, fluid and solid mechanics, vibrations, inverse analysis, regularization, optimization, fluid-structure interaction and numerical methods should be considered.