压电/弹性复合板水下透射消声研究
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摘要
水下消声是各国海军高度关注的课题之一。传统的消声瓦覆盖层消声是种被动方式,而且对于高频声波的吸收效果并不理想;单体压电材料消声也有其不足。新材料的使用强化了消声的效果。本文在前人研究了的该新材料的反射消声基础上,转而研究透射消声,算是对新材料水下消声进行的补充说明。
     新材料模型为压电/弹性复合板,本文介绍了两层板的相关理论并列出它们应该满足的方程和关系式。声音在介质中传播的理论和方程也得到了阐述。然后,有机地联立了这些方程,求得了复合板上下表面的参数之间的关系。使用Fortran编程计算所得方程中的未知量,得出在不同的声波入射角情况下,所求参数的数值,然后用这些数据拟合曲线并进行相关讨论。
     通过计算发现,施加了电压的复合板确实能够消除声音,而且根据条件的改变,其消声效果也不同。对比了在不同板厚、频率和材料下的消声情况。最后讨论了声波垂直入射的几个问题。要说明的是,为满足消声的条件,需要进行相应的处理和布置,这些要求可能成为新的课题。
Navies in many countries consider the elimination of acoustic wave a great subject. The traditional way of elimination by using attenuation watts is a passive approach which has less effect when the frequency is high than when the frequency is low. But the work done by using pure piezoelectric material cannot satisfy us either. However, the new material gives a good answer to the question. Some people in the area have done good jobs to eliminate waves of reflection in the face of the new material. This paper borrows the model of them and studies the acoustic wave elimination of transmission. The author consider it a supplement to the work which scientists have already done.
     The model of the new material is constructed by a bi-laminated plate which is composed of an elastic layer in contact with a piezoelectric layer. The principle of the two layers is introduced and the equations they should satisfy are got. Of course, the same thing is done to the incident wave. Then we organically create the simultaneous equations in order to get the relationship between the parameters in both surface and bottom of the layers. Now the result is obtained by using Fortran to calculate the equations in different angle. The numbers produced by computer are used to plot some figures through which we discuss the effect of the elimination.
     After calculating, the elimination of sound in composite plate with voltage is possible. The effectiveness is different when conditions are changed. The results in different plate thickness, different wave frequency and different plate material are compared. At the end, some problem in vertical incident wave are discussed. In order to satisfy the condition, the plate and voltage should be rearranged. These may be the new subjects in future.
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