Studies on fluid-elastic instability and active control of pipes conveying fluid

流体输送管道流弹不稳定性及主动控制研究

基本信息

批准号：
02650449
负责人：
DOKI Hitoshi
金额：
$ 1.22万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650449/
关键词：
Fluid-conveying pipe Fluid-elastic vibration Active control Flutter Divergence Tendon Thruster Damper フラッタランドン

项目摘要

This study deals with the fluid-elastic instability and active control of cantilevered pipes conveying fluid. In order to control the response of the cantilevered pipe with a damper, an active control force is derived by the torque produced by a pair of tendons attached to the pipe. The problem is solved by means of the Galerkin method in conjunction with the optimal regulator theory. The combined effect of a damper and a tendon on the critical flow velocity in the uncontrolled system is clarified. Furthermore, the numerical simulation of the response of a pipe conveying fluid is carried out for various conditions, the effect of a damper on the active control of the pipe is also clarified.The main results obtained are summarized as follows :(1)The effect of the positions of a damper and a tendon on the dynamic stability of a pipe conveying fluid in the uncontroled system is complex. In the stabilization of the pipe using a damper, the suitable position of a damper must be decided carefully together with that of a tendon.(2)In the uncontrolled system, a damper is effective to stabilize the pipe conveying fluid only when the most suitable positions of a damper and a tendon are selected. A damper attached to the pipe at the unsuitable position destabilizes the pipe.(3)The active control method using a tendon and a damper is effective to stabilize the pipe when they are set at the suitable position. The settling time of the response of the pipe decreases and a damper reduces the active control energy.(4)The active tendon control method described in this study is effective to stabilize the pipe, even if the pipe is lost its stability by selecting the unsuitable position of a damper. Therefore, the tendon-control pipe system is robust.(5)It is confirmed experimentally that the control system using PID controller is effective to stabilize the pipe conveying fluid.

本研究涉及输送流体的悬臂管道的流体弹性不稳定性和主动控制。为了用阻尼器控制悬臂管的响应，通过附在管上的一对筋产生的扭矩来产生主动控制力。利用伽辽金法结合最优调节器理论解决了该问题。阐明了阻尼器和筋对非受控系统中临界流速的综合影响。此外，还对各种工况下输送流体的管道的响应进行了数值模拟，明确了阻尼器对管道主动控制的影响。主要结果总结如下：(1)效果在非受控系统中，阻尼器和筋的位置对输送流体的管道的动态稳定性的影响是复杂的。在使用阻尼器稳定管道时，必须与筋的位置一起仔细确定阻尼器的合适位置。（2）在非受控系统中，只有在最合适的位置时，阻尼器才能有效地稳定输送流体的管道。选择阻尼器和腱的位置。在不合适的位置安装在管道上的阻尼器会使管道不稳定。(3)当将它们设置在合适的位置时，使用腱和阻尼器的主动控制方法可以有效地稳定管道。管道响应的稳定时间减少，阻尼器降低了主动控制能量。（4）本研究中描述的主动腱控制方法可以有效地稳定管道，即使由于选择不合适的管道而失去了稳定性。阻尼器的位置。因此，筋控管道系统具有鲁棒性。(5)实验证实，采用PID控制器的控制系统能够有效地稳定输送流体的管道。