加筋板结构声传输研究

Sound Transmission through Stiffened Plates

采用有限元法和Rayleigh积分建立了空气中嵌在无限大刚性障板上加筋板结构在简谐平面声波斜入射情况下的声传输计算模型 ,并研究分析了加筋板结构的板厚、肋骨惯性矩和间距、边界条件、板材和平面声波入射角度等对结构传声损失的影响以及平面声波入射角度与隔声低谷的关系 ,得到了一些有意义的结论 ,从而为揭示加筋板结构声传输特性 ,改善结构的隔声性能提供了一定的依据。

The computational model of sound transmission through a stiffened plate in air excited by a harmonic oblique incident plane wave and mounted in an infinite baffle using the finite element method and the Rayleigh integral is presented. The influences of plate thickness, moment of inertia and spacing of stiffeners, boundary condition, plate material and angles of incidence of the plane wave on the sound transmission loss of the stiffened plate and the relationship between angles of incidence of the plane wave and the valleys of the sound transmission loss curve were studied. Some meaningful conclusions have been reached. The results obtained in this paper show that the sound transmission characteristics of stiffened plate can be used to enhance the structural sound insulation performance of stiffened plates.