A galloping analysis method for an elastically supported cylinder under wake flow considering kinetic aerodynamic forces

A technology of elastic support and analysis method, applied in the field of simulation analysis, can solve the problem of insufficient induced vibration and so on

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A technology of elastic support and analysis method, applied in the field of simulation analysis, can solve the problem of insufficient induced vibration and so on

CN109522648BActive Publication Date: 2022-04-05CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY

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[0085] Simpson first predicted the amplitude of the transmission line by the Runge-Kutta method, and used a simple approximate analytical function without considering the aerodynamic damping to conduct a preliminary nonlinear study of the wake galloping vibration. In the 1980s, Allnutt et al. used linear theory to predict the existence of a limit cycle centered on a dynamic equilibrium position, and expressed the limit cycle as a sine function. After that, Price obtained the spatial distribution of the average lift-drag coefficient of the transmission conductor under the wake through wind tunnel tests, and used a quasi-steady method including aerodynamic higher-order terms to represent the aerodynamic force of the downstream conductor, and established a wake galloping theoretical model to study Wake gallop.

[0086] The present invention will first simulate the lift-drag coefficient of the downstream cylinder under a specific spacing ratio, and obtain the load of the wire move...

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Abstract

The invention discloses a method for galloping analysis of an elastically supported cylinder under wake flow considering aerodynamic force. The concept of the method is clear. On the basis of obtaining aerodynamic load models at different fixed positions, corrections are made considering fluid-solid coupling motion to solve the problem. The method is simple and clear, and can effectively solve the wake vibration of the downstream cylinder relative to the upstream cylinder. Including: S1, three-component force coefficient simulation working conditions; S2, lift-drag coefficient fitting analysis; S3, wake galloping motion differential equation establishment and solution.

Description

technical field [0001] The invention relates to the technical field of simulation analysis, in particular to a method for analyzing the galloping vibration of an elastically supported cylinder under wake flow considering moving aerodynamic forces. Background technique [0002] Wind tunnel tests and computational fluid dynamics methods are generally used in the related research on power line wake galloping. None of these methods require an explicit aerodynamic model of wake vibrations. Simpson predicted the amplitude of the transmission line by the Runge-Kutta method, and performed a preliminary nonlinear study of the wake galloping vibration using a simple approximate analytical function without considering the aerodynamic damping. Other numerical simulations are still insufficient to study the fluid-induced vibration of the cylinder under the action of the wake. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the deficiencies of the...

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Application Information

Patent Timeline

05 Apr 2022

Publication

CN109522648B

IPC: G06F30/28; G06F113/08; G06F119/14

CPC: G06F30/20; Y02T90/00

Inventors: 晏致涛; 张江滔