关于曲管振动声弹耦合程度的研究

讨论3种不同圆心角的两端固支曲管在其平面内的声弹耦合振动及其影响因素。研究了流体固体的刚性比α、截面特性比γ和质量比β等因素对声弹耦合程度的影响以及对系统声弹耦合振动频率的影响。结果表明，α与γ的乘积ζ是影响曲管声弹耦合振动的重要参数。随着ζ的增加，结构振动与流体声波压力脉动由非耦合变为耦合。二者的耦合导致系统特征值迅速下降，直至失稳。

RESEARCH FOR ACOUSTICO ELASTIC COUPLING OF CURVED PIPES VIBRATION

A discussion is given regarding the acoustico elastic vibration of curved pipes with three different subtended angles and fixed at two ends. The influence parameters of eigenvalues of the coupled system such as stiffness ratio α ,sectional characteristic ratio γ and density ratio β are studied. The result shows that the product ζ of α and γ is an important parameter influencing the coupling vibration of curved pipes. With increase of ζ the structural vibration and acoustic fluctuation are turned from uncoupling to coupling. The coupling will result in a rapid decrease of eigenvalues of the system and in divergence in the end.