Abstract
A lot of research on the properties of a panel-enclosure coupled system which consists of an enclosure with a simply supported flexible wall was conducted. However, an enclosure with clamped flexible walls is commonly encountered. The properties of a panel-enclosure system, with one clamped flexible wall, are different from those of a simply supported one, and there are only a few studies on it. Thus, this paper is dedicated to the study of the effect of structural-acoustic coupling on the properties of a panel-enclosure system, which consists of an enclosure with a clamped panel. The resonance frequencies and the decay times of the coupled system are obtained using the classical modal coupling theory. The effects of enclosure and its flexible boundary on the resonance frequencies and the modal decay times of the coupled system are then analyzed. It is shown that, when panel thickness is changed, coupling strength is determined by the difference between the resonance frequencies of the panel and the enclosure modes. However, for the variation of enclosure depth, the factor which determines the coupling strength between panel and enclosure modes is the enclosure depth or the difference between their resonance frequencies.
Highlights
The interaction between a sound field in an enclosure and its flexible boundary is a critical problem, and a good understanding of it is important to the control of sound field in an enclosure
To demonstrate the properties of the panel-enclosure coupled system which consists of an enclosure with a clamped flexible wall, the resonance frequencies and modal decay times of acoustical modes are investigated with different panel modal density, panel internal damping, and enclosure depth, respectively
This paper presents a theoretical investigation into the vibroacoustic analysis of a rectangular enclosure with clamped flexible wall using the classical modal coupling method
Summary
The interaction between a sound field in an enclosure and its flexible boundary is a critical problem, and a good understanding of it is important to the control of sound field in an enclosure. At the five absorptive walls inside the enclosure and the flexible enclosure interface, the boundary conditions take the following form: Sung and Jan [19] and Arenas [20, 21], the transverse vibration response and sound radiation by a clamped panel were obtained using the virtual work principle. This work is an extension of the work carried by Pan and Bies [3] and Sung and Jan [19], where the effect of fluid-structural coupling on the sound field in the enclosure is studied with a supported flexible wall using the modal coupling method, and the clamped boundary panel with new mode shape function is used to analyze the vibration response, respectively
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