摘要
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.
To research the dynamic characteristics of pipes excite d by unsteady flow,a pipe excitation system with a wave exciter as fluctuations generator was constructed.A fluid-structure interaction finite element mathem atical model of pipe excitation was established and the dynamic responses of the fluid and the pipe were solved.The numerical simulation results show that the fluid pressure inside the pipe is a cyclical impact pressure,whose value is sev eral times more than the system pressure and it increases with the increasing of system pressure.The pipe vibration also exhibits periodic impact with high-fr equency harmonics,whose frequency is controlled by the wave exciter,amplitude by the system pressure.The amplitude of pipe at both ends is larger while small er in middle.The impact vibration of pipe is caused mainly by the composite eff ect of water hammer and solid-liquid coupling.A hydraulic fluctuations vibrati on test system was design to obtain real date,which was in good agreement with the simulation results.Vibration response characteristics of the pressure pipe conveying fluid were revealed,providing theoretical and data support for active control of vibration.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期17-22,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50775154)
山西省青年科学基金资助项目(2010201025)
关键词
液压波动
充液管道
振动
流-固耦合
激波器
hydraulic fluctuation
pipe conveying fluid
v ibration
fluid-structure interaction
wave exciter
