Method and device for designing and optimizing passive vibration controller for fluid conveying pipe vibration control

Abstract

The invention discloses a method for designing and optimizing a passive vibration controller for fluid conveying pipe vibration control, and aims at solving the excessive vibration problem of fluid conveying pipes, providing the advantages of being free of external energy input and simple in installation operation, and breaking through the problem that the passive controller are relatively large in mass. The passive controller consists of parallel nonlinear energy traps; in order to verify the vibration control effect of the vibration controller, a mathematic model of a fluid conveying pipe-vibration controller system is established on the basis of a target energy transfer theory; and after dimension reduction and discretization are carried out on a dimensionless model through a standard Galerkin method, numerical simulation of the system is completed under a boundary condition of the system. Results indicate that the vibration controller is capable of rapidly and effectively dissipating the vibration energy of the fluid conveying pipes via a mass which is 5% of the mass of the whole system. Finally, the control is optimized through a ratio function of the energy dissipated by the controller and the total energy of the system; and the optimization result indicates that the precision requirement for mounting positions is not high in a certain range.

Description

technical field [0001] The invention proposes a passive vibration controller with self-adaptive characteristics for suppressing the vibration of the flow pipe, and carries out corresponding design and optimization on it, which belongs to the field of vibration control and simulation in structural strength analysis and test. Background technique [0002] Flow pipes have important application value and a wide range of applications in the industrial field. For example, in heat exchange, fuel transportation, hydraulic pressure and other fields, pipelines are used to transport fluids with a wide range of flow rates. Changes in fluid flow rates will induce excessive vibration in the pipelines. In turn, mechanical failures such as noise, material fatigue, and liquid leakage will occur, causing the equipment to fail to meet the required performance indicators. In terms of vibration control of flow pipes, there are two methods: active control and passive control. Although the control...

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Problems solved by technology

[0002] Flow pipes have important application value and a wide range of applications in the industrial field. For example, in heat exchange, fuel transportation, hydraulic pressure and other fields, pipelines are used to transport fluids with a wide range of flow rates. Changes in fluid flow rates will induce excessive vibration in the pipelines. In turn, mechanical failures such as noise, material fatigue, and liquid leakage will occur, causing the equipment to fail to meet the required performance indicators

In terms of vibration control of flow pipes, there are two methods: active control and passive control. Although the control effect of the active control method is better, it has not been widely used because of the need for additional energy input and sensors; and the general passive vibration control The controller also has the disadvantages of large mass, poor control effect and long control process. In order to reduce the structural quality of the vibration controller and improve the suppression effect on pipeline vibration, based on the nonlinear targeted energy transfer theory and parallel nonlinear energy wells (parallel nonlinear energy sinks), designed a passive vibration controller to suppress excessive pipeline vibration

Judging from the existing literature, there are two important problems about the passive vibration controller of the flow pipe: first, the mass of the controller is relatively large, usually accounting for more than 10% of the total mass of the pipeline and the fluid, which is a serious limitation The scope of application of the passive vibration controller is defined; 2. Usually, the adaptability of the passive vibration controller is relatively poor, that is, the vibration control effect is only good in a very narrow flow rate range.

So far, no patent discloses the design and optimization of this type of passive vibration controller

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