论文部分内容阅读
本文对充液圆柱壳中低阶和高阶周向模态结构振动波的频散特性进行了研究 ,得到了相应的频散曲线 ,分析了自由振动波的性质及其随频率变化的规律。结果表明 :在低阶周向模态时 ,第一道传播波的起始频率从零频率开始 ;当周向模态阶数大时 ,第一道传播波的起始频率不在零频率。低阶周向模态最多只会有一道衰减驻波 ,在环频率以上 ,有、无衰减驻波的频域相间隔出现。随着周向模态阶数的提高 ,在低频和高频区域都会出现两道衰减驻波的情况 ;低阶周向模态的前几道波 ,起始频率相对较低 ,都是以两种位移为主的耦合波形态起始的 ,起始频率相对较高的波和较高阶周向模态的传播波基本上是以弯曲波起始 ;各传播波的流体荷载项的大小反映了各波在传播过程中流体与壳体相互作用的强弱。存在两种较小的情况
In this paper, the dispersion characteristics of low- and high-order circumferential modal vibration waves in a liquid-filled cylindrical shell are studied. The corresponding dispersion curves are obtained, and the properties of the free vibration wave and its variation with frequency are analyzed. The results show that the starting frequency of the first propagating wave starts from zero frequency in the low-order circumferential mode and the starting frequency of the first propagating wave is not at zero frequency when the number of the circumferential modes is large. At most, there will be at most one attenuating standing wave in the low-order circumferential modal. Above the ring frequency, the frequency domain with and without attenuation appears at intervals. With the increase of the circumferential modal order, two cases of standing wave attenuation appear in the low frequency and high frequency regions. The first few waveforms in the low order circumferential mode have a relatively low initial frequency and are mainly two kinds of displacement Of the coupling wave morphology starting, the relatively high initial frequency wave and the higher order circumferential mode of the propagation wave is basically the beginning of the bending wave; the magnitude of the fluid load of the propagation wave reflects the various waves in the propagation process The strength of interaction between fluid and shell. There are two smaller cases