摘要
研究矩形平板的远场声压级,建立简支边界矩形障板和滑移边界矩形障板模型。采用傅里叶变换获得远场声压级,分析点激励载荷和线激励载荷作用下远场声压级的变化规律,并讨论激励载荷位置以及结构物理特性参数对远场声压级的影响。结果表明,远场声压随着激励载荷靠近边缘而减小,相对于简支边界而言,滑移边界能增强远场声压级。随着损耗因子、板厚的增大,将减小整个频率段内的远场声压级。另外,板密度对远场声压级的影响在低频段和高频段也呈现不同的变化规律。通过声压级变化规律的分析研究,能为声学元件设计和噪声控制机理的分析提供一定的依据。
The far-field sound pressure level of rectangular plates is studied. Acoustic models for simply supported andguided supported rectangular plates in an infinite baffle are established respectively. The far- field approximate solution isderived in a closed form using Fourier transform method. Two kinds of possible concentrated forces, a line force and a pointforce, are included respectively in the analysis. Furthermore, a parametric study is carried out to clarify the effect of theincentive loading position and the various physical parameters of the rectangular plates. It is concluded that, the far- fieldpressure level decreases with the location of the incentive loading approaching the edge of the plate. In comparison with thesimply supported edge, the guided edge can enhance the far-field radiation sound pressure. With the increasing of the lossfactor and the thickness of the plate, the far- field sound pressure level decreases in overall frequency range. On the otherhand, density of the plate has different influences on the far- field sound pressure level in low frequency range and highfrequency range respectively. This work may provide a foundation for design of acoustic components and analysis of activenoise control.
出处
《噪声与振动控制》
CSCD
2014年第1期23-27,共5页
Noise and Vibration Control
基金
国家自然科学基金资助项目(50875259)
海军工程大学自然科学基金(HGDQNJJ033)
关键词
声学
矩形平板
远场声压级
滑移边界
噪声控制
acoustics
rectangular plate
far-filed pressure level
guided supported edge
noise control
