基于声学边界条件,建立了聚氨酯/环氧树脂(PU/EP)弹性体的水声模型,探讨了弹性体弹性模量、损耗因子及泊松比对其声学性能的影响；在水声脉冲声管中测试了PU/EP 的水声性能并进行了算例验证.仿真结果表明,较大的模量、合适的阻尼因子和较高的泊松比是 PU/EP 弹性体获得低反射、高吸声性能的关键.水声测试结果表明,PU/EP(70/30)弹性体的平均吸声系数为0．39,最大吸声系数为0．42,且反射系数在整个频段范围内小于0．4,可作为水声吸声材料的基材.算例验证表明,计算结果与实验测量结果吻合的较好.
An underwater acoustic model of polyurethane/epoxy resin (PU/EP)elastomer was established based on the acoustic boundary conditions,the influences of the PU/EP elastomer’s elastic modulus,loss factor and Poisson’s ratio to its acoustic performance;the underwater acoustic property of PU/EP(70/30)elastomer was tested on underwater acoustic pulsetube system.The simulation results showed that larger modulus,suitably damping factor and higher Poisson ratio were the key to obtain low reflection and high acoustic absorption per-formance.The underwater acoustic test results showe that the average acoustic absorption coefficient of PU/EP (70/30)elastomers was 0.39,the maximum absorption coefficient was 0.42,and the reflection coefficient over the entire frequency range of less than 0.4,it can be used as acoustic absorbing material matrix.And the numer-ical examples show the experimental results of PU/EP elastomer were basically consistent with the acoustic model simulation results.
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