Structure-Modified Influence on the Interior Sound Field and Acoustic Shape Sensitivity Analysis

Wu, Jiu Hui

doi:10.1006/jsvi.2001.4021

Cited by 1 publication

(1 citation statement)

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“…Though the covering-domain method is a general and powerful analytical method for evaluating the interior sound field in any complicated convex polyhedron, it has a shortcoming in convergence by numerical calculation Especially, when the product of k and R (k is the wave number and R is the radius of the covering spherical shell) is large, the series in expression has low convergence and it leads us to calculate more terms of the series to obtain an accurate result 12 .…”

Section: Improved Covering-domain Methodsmentioning

confidence: 99%

New Analytical Method for Modeling Active Structure Acoustic Control System within an Irregular Enclosure

Zhang

Chen

2005

Journal of Low Frequency Noise, Vibration and Active Control

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A new analytical method for the acoustic-structure coupled problem within an irregular enclosure, which has both inner sound sources, and exterior forces exciting it, was developed based on a method called the covering domain method. The method is not only more accurate and faster than numerical methods, such as FEM/BEM, but also can be used to solve acoustic-structure coupled problems within any irregular enclosure in a convenient way, that are impossible for the traditional analytical method. The model for, the active structure acoustic control (ASAC) system of an irregular enclosure based on the method above was founded, and then the optimized actuators outputs were given, which is the key step for ASAC system design. Then the method was applied to a car-like-cavity and it was found that the simulation result is quite good and shows us this new general analytical method for solving active structure acoustic control problems within an irregular enclosure considering acoustic-structure coupling to be quite effective and fit for any irregular enclosure.Key words: acoustic-structure coupling; ASAC; irregular enclosure, analytical method INTRODUCTIONThe noise problem of passenger cabins in vehicles is becoming more and more acute with increasing demand for better performance and user satisfaction. Up to now a significant amount of research has been performed to develop active control technologies for quieting low-frequency noise in the cabins of vehicles and aircraft. 1,2 The previous investigations show that the low-frequency interior noise in closed cabins is mainly caused by structural-acoustic coupling. 3 The complicated structuralacoustic coupling behaviour of cabins, however, makes it quite difficult to implement an ASAC (Active Structure Acoustic Control) system that controls sound radiated by all the vibrating boundaries. Consequently, the key to implementing practical ASAC system depends heavily on the full analysis of structural-acoustic coupled systems.The problem has drawn the interest of many researchers during recent decades. Currently, typical ways to solve the acoustic-structure coupling problem are the energy method, the numerical method and the analytical method.The energy method, such as SEA or EFM 4 , is not fit for the low-frequency case and cannot provide the distribution of the sound level in the enclosure.The numerical methods, represented by FEA/BEM and SUP, are not only timeconsuming but also lack the full details of the coupling system that are important for control. Furthermore, it is costly to build a CAD model for complex cavities, which

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Section: Improved Covering-domain Methodsmentioning

confidence: 99%