Novel aeroelastic model for wind tunnel test of power transmission tower structure

Abstract

The invention discloses a novel aeroelastic model for a wind tunnel test of a power transmission tower structure, and belongs to the technical field of the design of power transmission lines. The novel aeroelastic model for the wind tunnel test of the power transmission tower structure comprises crank arms, angle steel type segments, n-type spring sheets, copper wires, and a tower skeleton body, the tower skeleton body is formed by connection of angle steel type aluminium segments which are formed by machining according to geometric similarity through bolts, the crank arms are formed by connection of the angle steel type aluminium segments through the n-type spring sheets, and the inner sides of the angle steel type segments are provided with counterweight metal wires. According to the aeroelastic model, the rigidity similarity of the aeroelastic model is guaranteed through adjustment of geometric parameters of the spring sheets, the similarity of parameters such as mass, damping, frequency, and geometry etc. is realized by employing the counterweight of the metal wires and the angle steel type aluminium segments reduced with equal proportion, the aerodynamic force characteristic of the power transmission tower by the wind load can be accurately simulated, the wind tunnel test of the model can obtain real and reliable data, and the research of the wind load characteristic of the power transmission tower is facilitated.

Description

technical field [0001] The invention belongs to the technical field of transmission line design and relates to a novel aeroelastic model for wind tunnel experiments of transmission tower structures in the technical field of wind load experiments. Background technique [0002] With the construction and development of high-voltage and ultra-high-voltage transmission lines, the height of high-voltage transmission towers and the span of lines are getting larger and larger. The transmission tower structure is more prone to aerodynamic instability under external excitation, resulting in large vibrations of the transmission tower, and even tower collapse accidents, which seriously threaten the safe and stable operation of the transmission line. The transmission tower is a flexible structure, which will produce a large response under the action of wind load. The mechanism of the wind effect of the tower structure is very complicated, and it cannot be completely solved in theory. The...

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Problems solved by technology

[0003] At present, the existing aeroelastic models of transmission towers mainly have the following problems: 1. The geometric similarity and mass distribution of the prototype of the transmission tower cannot be satisfied; 2. The similarity of damping, frequency and stiffness distribution to the prototype of the transmission tower cannot be satisfied at the same time ; 3. The eddy current shedding effect and aerodynamic characteristics of the transmission tower structure under wind load excitation cannot be accurately simulated

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