Abstract
The interaction between the sound field in an enclosure and its flexible panel is a critical problem; the influence of structural parameters on global vibroacoustic coupling characteristics of the panel‐enclosure system is very important. In this paper, a novel index of the global coupling level was first proposed to describe the global vibroacoustic coupling extent between multiple panel vibration modes and enclosure acoustical modes of the coupled system. Then, the influence of structural parameters on global coupling levels of the coupled system with different panel boundary conditions was obtained based on the numerical results of transfer factors. Moreover, according to the comprehensive influence of the structural parameters on global coupling levels, design methods of the coupled system with low global coupling levels were then discussed. Finally, the influence mechanism of panel boundary conditions on the coupling characteristics of the coupled system was analyzed. The results show that the structural parameters have similar effect on the coupling property of the system with different panel boundary conditions. Furthermore, the influence of the structural parameters on the coupling property of the system with a clamped panel is more sensitive than that of the system with a simply supported one. Furthermore, the structural parameters, especially the enclosure depth and panel thickness, are not completely negative correlated to the global coupling levels of the system. In conclusion, this study could provide a theoretical basis for acoustical design of the panel‐enclosure system (e.g., rectangular vehicle cabins) with low global coupling level, as well as the lightweight structure design of the system.
Highlights
Academic Editor: Mohammad Rafiee e interaction between the sound field in an enclosure and its flexible panel is a critical problem; the influence of structural parameters on global vibroacoustic coupling characteristics of the panel-enclosure system is very important
A novel index of the global coupling level was first proposed to describe the global vibroacoustic coupling extent between multiple panel vibration modes and enclosure acoustical modes of the coupled system. en, the influence of structural parameters on global coupling levels of the coupled system with different panel boundary conditions was obtained based on the numerical results of transfer factors
In recent year, in the lightweight development process, the low-frequency noise (20–200 Hz), such as the booming noise generated by the vehicle cabin structure-acoustic coupling, has become one of the most important factors contributing to the comfort level of the occupants of a passenger car. erefore, a good understanding of structure-acoustics coupling is important to control the sound field in an enclosure
Summary
Received 17 April 2018; Revised 25 July 2018; Accepted 1 August 2018; Published 2 September 2018. E interaction between the sound field in an enclosure and its flexible panel is a critical problem; the influence of structural parameters on global vibroacoustic coupling characteristics of the panel-enclosure system is very important. As an extension of the work carried out by Pan and Bies [3] and Sung and Jan [6], Wang et al [8] analyzed the e ect of di erent variables, including panel thickness, panel internal damping, and enclosure depth, on the coupling features of the coupled system, which include resonance frequency and modal decay time. Is paper presents a parametric study on the in uence of structural parameters on the global vibroacoustic coupling characteristics of a rectangular enclosure bounded by a exible panel with di erent boundary conditions. Analytical Model e rectangular panel-enclosure system is shown in Figure 1. e enclosure has ve small absorptive walls and one exible z Flexible panel
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