CAJ | 학술논문

管道中流体和弹性体之间的相互作用是引起管道振动的主要原因，这种流固耦合作用对管道动力特性有直接影响。通过实验和数值分析研究输流管道在流固耦合作用下的振动模态、幅频响应等动力特性的变化规律。根据流体三维波动方程和管道动力学方程之间的耦合关系建立空间输流管道系统的直接流固耦合动力有限元模型，进行管道系统有无流体两种工况下的模态实验。通过和实验结果的对比，验证了输流管道耦合动力学模型的合理性和流体对管道模态的影响，研究了不同频率下流固耦合特性对管道幅频响应的影响及作用机理。发现水介质流体显著降低了管道固有频率，但是在不同频率下流体对管道幅频响应的作用效果并不相同。
관도중류체화탄성체지간적상호작용시인기관도진동적주요원인，저충류고우합작용대관도동력특성유직접영향。통과실험화수치분석연구수류관도재류고우합작용하적진동모태、폭빈향응등동력특성적변화규률。근거류체삼유파동방정화관도동역학방정지간적우합관계건립공간수류관도계통적직접류고우합동력유한원모형，진행관도계통유무류체량충공황하적모태실험。통과화실험결과적대비，험증료수류관도우합동역학모형적합이성화류체대관도모태적영향，연구료불동빈솔하류고우합특성대관도폭빈향응적영향급작용궤리。발현수개질류체현저강저료관도고유빈솔，단시재불동빈솔하류체대관도폭빈향응적작용효과병불상동。
The interaction between fluid and elastic solid in fluid-filled pipes plays a key role in pipeline vibration. The fluid-structure coupling effect has a direct impact on the pipe’s dynamic characteristics. In this paper, by means of experiment testing and numerical analysis, the dynamic characteristics, such as pipeline vibration modal, amplitude-frequency responses and so on, of a fluid-filled pipe system with the fluid-structure interaction was studied. According to the coupling relationship of the three-dimensional fluid wave equations and the structural dynamics equations, a 3D fluid-solid coupling finite-element model was established for the pipe system. The modal testing of the system was carried out for two different cases: empty pipeline and fluid-filled pipeline. Comparing the numerical results with test data, the fluid-solid coupling dynamic model was validated and the effects of fluid on the pipeline modal were analyzed. The influence and mechanism of coupling characteristics on amplitude-frequency responses of the pipe system were investigated for different excitation frequencies. It is found that the effects of fluid medium can remarkably reduce the natural frequencies of the pipe, but the effects of fluid on pipe amplitude frequency responses are variable for different frequencies.