Method for calculating unsteady aerodynamic coefficient of wind and rain induced vibration of power transmission line

Abstract

The invention provides a method for calculating an unsteady aerodynamic coefficient of wind and rain induced vibration of a power transmission line, that is, an experiment and CFD numerical simulation hybrid substructure method. The method comprises the steps of (1) developing a simulation wind tunnel experiment bench; (2) constructing an experimental power transmission line model; (3) acquiring the amplitude and the frequency inside and outside the surface of the model by a measuring device; (4) using model vibration response acquired by the experiment to act a moving boundary and applying the moving boundary to a CFD flow field substructure; and (5) only carrying out CFD numerical simulation calculation on a circumferential flow field of the moving boundary so as to acquire the unsteady aerodynamic coefficient of the line vibration. The method provided by the invention does not need to carry out finite element calculation or data exchange of the structure, so that the calculation efficiency of the wind-induced vibration of the structure can be greatly improved; and meanwhile, the vibration of the structure is acquired by a physical test, so that a numerical calculation result of circumferential flow field characteristics is high in precision.

Description

technical field [0001] The invention relates to a method for calculating the aerodynamic coefficient of structural vibration, in particular to a method for calculating the unsteady aerodynamic coefficient of the wind and rain induced transmission conductor vibration. Background technique [0002] The wind and rain-induced vibration of the transmission line is the coupling vibration between solid, liquid and gas. The wind and rain-induced vibration has the characteristics of large amplitude, low frequency, and sporadic nature, which can easily cause severe wear of hardware, damage and broken strands of wires, and seriously affect the safe and stable operation of transmission lines. Therefore, the research on the mechanism of wind and rain-induced vibration of transmission wires is a key problem to be solved urgently. In order to reveal the mechanism of wind and rain induced vibration, it is necessary to obtain the unsteady aerodynamic coefficient of the vibration of the tran...

AI Technical Summary

Problems solved by technology

Due to the in-plane and out-of-plane vibrations of the transmission wire under wind and rain conditions, the wind angle and the position of the rain line are constantly changing, so it is difficult to obtain the variation law of the unsteady aerodynamic coefficient of the wind and rain-induced transmission wire vibration through the wind tunnel experiment method

The CFD numerical simulation method can be used to study the aerodynamic force on the transmission line when the wind and rain are excited, but usually, with the increase of the Reynolds number, the grid number and calculation amount increase exponentially, which greatly reduces the calculation efficiency. Even difficult to calculate for some problems

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