聚氨酯空腔尖劈吸声性能实验研究

Acoustic performance test of a polyurethane cavity wedge

实验测试了新型聚氨酯空腔尖劈不同温度下材料低频动力学参数及尖劈不同静压下吸声系数。通过绘制Wicket图进行了数据筛选,应用时温等效原理,得到了规定温度下宽频范围内材料动态力学参数,随后讨论了尖劈吸声性能随静水压力、温度、频率的变化规律。在测试数据基础上,基于优化理论对尖劈腔型进行优化设计,开展了声呐平台区敷设空腔尖劈的应用研究,分析了敷设前后声呐平台的声振特性,验证了新型聚氨酯吸声尖劈的减振降噪效果。

The sound absorption performance of a polyurethane cavity wedge is of significant importance ot vibration and noice reduction of a sonar platform,the wedge material dynamic mechanical parameters under different temperatures and its sound absorption coefficients under different hydrostatic pressures were respectively tested through the experimental stady.Wicket chart was introduced to screen the test data,and the material parameters were obtained in a broad band under a certain temperature by using the equivalent principle of time-temperature.Furthermore,the varying characteristics of sound absorption performance with temperature,frequency,and hydrostatic pressure were discussed.Based on the test data,the vibration and acoustic characteristics of a sonar platform laid with a polyurethane cavity wedge was studied through a large-scale model test.The vibration and noise reduction effects of a new type polyurethane cavity wedge were verified.The model test provided a reference for the self-noise characteristics stady of a sonar platform and the naval applications of polyurethane acvity wedges.