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采用结构有限元软件NASTRAN和声学边界元软件SYSNOISE,对某型艇振动与声学特性数值计算问题进行了研究。通过基于全船三维有限元分析模型的频响分析计算,获得该船结构振动响应特性参数。以振动频响分析计算结果作为声学边界条件,考虑球面点噪声源的影响,建立了全船三维边界元声学分析模型;并采用间接边界元法,对某型艇近场和自噪声声学特性进行了计算。所得计算结果与该船实测数据进行了对比,证明本文计算方法是可行的。
The structural finite element software NASTRAN and acoustic boundary element software SYSNOISE were used to study the numerical calculation of vibration and acoustic characteristics of a type of ship. Through the frequency response analysis and calculation based on the three-dimensional finite element analysis model of the whole ship, the vibration response characteristic parameters of the ship structure are obtained. Taking the analysis of vibration frequency response as the acoustic boundary condition and the influence of the spherical point noise source, the acoustic analysis model of three-dimensional boundary element is established, and the acoustic properties of the near-field and self-noise of a type of ship are simulated by indirect boundary element method Calculated. The calculated results are compared with the measured data of the ship to prove that the calculation method is feasible.