对镶在圆柱障板上单块有限复合板散射近场的研究

STUDY OF NEAR FIELD SCATTERING PERFORMANCE OF ONE FINITE COMPOSITE PLATE INSERTED IN A CYLINDRICAL BAFFLER

本文提出了预测镶在圆柱障板上一块具有三层加筋结构的复合材料有限板的振动特性和近场散射特性的理论模型。研究了在密介质中振动系统和入射声场的互作用以及不同振动之间由于辐射场引起的互耦合作用,数值计算了简支镶嵌在圆柱障板上的单块有限复合板的各种振动模式自耦合和互耦合系数,计算分析了有限复合板的振动再辐射近场特性。设计进行了测定有限复合板系统的近场实验。实验结果与理论计算结果符合较好。

This paper describes a theoretical model to predict the vibrating behaviour and the near-field scattering performance of one fmite plate inserted in a rigid cylindrical baffler, while the plate is made of the composite material which contains three reinforced thin layers. Interaction between normal modes owing to sound-medium coupling is taken into consideration. In the mean-while,the self-coupling and mutual-coupling coefficients of various' modes of vibration are calculated numerically. And then, amplitudes for every mode of the composite plate and values for the near-field scattering of the vibrating system are calculated also. We have proceeded to measure the characteristics of the near field scattering about the vibration system. Experimental results are comparatively consistent with theoretical values.