缩比模型试验中弹性散射波的相似性分析

Similarity Study of Elastic Scattering Waves in Scaling Model Experiment

对处于无限水介质中、材料分别为钢和铝的弹性平板中广义Lamb波的频散曲线进行了理论推导和计算,并得到吻合频率.分析结果表明:原型目标在一般声呐频段出现的弹性散射波可能是外壳和内壳的s0波,但其强度很弱;在鱼雷声呐自导频段可能是外壳和内壳s0波和微弱的内壳a0波.在缩比模型试验中为保证弹性相似,要求缩比模型与原型目标的材料相同和频厚积相等.

The dispersion curve of generalized Lamb wave in an infinite plate immersed in water, whose material is chosen to be aluminum or steel, was derived theoretically and calculated to obtain the coincidence frequency. The analysis shows that in the frequency domain of common sonar, the elastic scattering waves are generated probably by so wave which is much weak from both outer and inner shells~ in the frequency domain of torpedo sonar self-conductance, the elastic waves probably are so wave from both outer and inner shells and a0 wave weakly from inner shell. For the elastic similarity, the material and the frequency-thick- ness product between the scaling model and prototype should be same, respectively.