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为了对充液管道的振动加以利用,研究其在非定常流激励下的动态特性,构建了以激波器为液压波动发生器的管道激振系统,建立管道液压激振的流-固耦合有限元数学模型,并求解了管道的动态响应.数值模拟结果表明:管内流体压力呈周期性冲击压力,其峰值压力是系统压力的数倍,且随系统压力的增大而增大;管道振动也呈现出周期冲击振动特性,并伴有高频谐波,冲击频率受控于激波器,振幅受控于系统压力,沿管道轴向两端振幅较大而中间较小,冲击振动主要由水击效应和固-液耦合的复合作用引起.设计了液压波动激振试验系统,仿真结果与实测数据符合较好,揭示了充液管道波动激励下的振动响应特性,为系统的振动主动控制提供了理论和数据支持.
In order to utilize the vibration of liquid-filled pipeline and study its dynamic characteristics under unsteady flow excitation, a pipeline vibration excitation system with shock wave generator as hydraulic fluctuation generator was established, and the flow-solid coupling limited The mathematical model and the dynamic response of the pipeline are solved.The numerical results show that the pressure of the fluid in the pipe is periodic impact pressure and its peak pressure is several times higher than the system pressure and increases with the increase of the system pressure. Showing periodic shock and vibration characteristics, accompanied by high-frequency harmonics, the impact frequency controlled by the shock wave, the amplitude controlled by the system pressure along the axis of the larger amplitude at both ends of the middle and smaller shock vibration mainly by water Which is caused by the compound effect of solid-liquid coupling and the effect of solid-liquid coupling. The system of hydraulic vibration excitation is designed. The simulation results are in good agreement with the measured data. The vibration response characteristics of liquid- Theoretical and data support.