基于频响函数求逆法的双层圆柱壳体速度场重构

从双层圆柱壳体结构水下噪声实时预报出发,基于在内壳体上布置大量传感器来监测壳体噪声的工程方法,提出了双层圆柱壳体表面速度场实时重构方法。先试验测量到不同工况下内、外壳振动频响函数,并用H4方法进行估计,再用频响函数求逆法得到内、外壳体响应间的振动传递率矩阵。实际应用时,根据内壳体上有限测点的信号实时重构出当前工况下的外壳体表面速度场,为水下噪声的实时计算提供输入。大型舱段模型试验验证表明该方法现实可行,重构出来的外壳体速度场能满足水下噪声实时预报要求。

Reconstruction of the Velocity Field for Cylindrical Double Shells Based on Frequency Response Funcuons

In order to calculate underwater radiation from cylindrical shell, and based on the method of noise monitoring by accelerometers, the reconstructing method of the velocity field around outer surface of cylindrical shell is investigated. At first, the frequency response functions of double shells are measured and estimated and then the vibration transmissibility between the double shells is obtained by calculating the M-P inverse of frequency response function. Thereby the velocity at the surface of outer shell can be reconstructed by the signals of accelerometers on inner shell, which is the input for calculating underwater radiation. The results of vibration tests of big cylindrical shells show reconstructed velocity field by the method is satisfied for calculating underwater radiation.