阻抗分析法在船舶结构动力响应分析中的应用研究

Impedance analysis method applied in underwater acoustic radiation analysis of ships

针对设备动力参数未知,设备基座振动加速度给定情况,提出阻抗分析法解决设备振动激励载荷下的船舶结构动力分析问题。基于理论分析,提出阻抗分析法,实现设备对基座的振动能量采取振动加速度激励作为输入,进而分析结构动力响应;通过舱段结构动力分析验证方法的有效性,并讨论不同加载方式对结构动力响应的影响规律,研究表明,该方法应用于结构声振分析是可行的,且加载方式对结构响应影响较大;在此基础上,将阻抗分析法应用于水下航行器水下声辐射研究,分析水下航行器声场周向分布规律。结果表明激励频率较低时水下航行器水下声场呈对称分布,随着频率提高,其对称性逐渐下降。

For the case of equipments with locally unknown dynamic parameters and given under-chassis vibration acceleration,the impedance analysis method was proposed to solve the dynamic response of ships. The alternative energy input was achieved in accordance with the under-chassis vibration acceleration. The validity of the method was verified through the dynamic analysis of a ship compartment and the effects of different under-chassis loading ways were investigated. The results show that the method applied to the structural vibration analysis is feasible and the loading ways have a great influence on the dynamic structural responses. On this basis,the method was applied to study the submarine underwater acoustic radiation. The sound radiation distribution along the circumference was examined. The results show that with the increase of frequency,the inhomogeneity of the sub acoustic radiation is enhanced gradually.