Experimental study on aeroelasticity of cantilever cylinder with strong and weak axes
An aeroelastic model test of a cantilever cylinder with strong and weak axes is designed.The test results of multiple wind angles and multiple wind speeds show that the two natural frequencies of the model correspond to two resonant wind speeds.When the wind axis is consistent with the structure axis,a typical cross-wind vortex-induced resonance will occur.However,when there is an angle between the wind axis and the structure axis,although the surface aerodynamic force of the cylinder is symmetrical,its vibration characteristics vary with the wind direction.In the case of small angle,the vortex-induced resonance of the cylinder still occurs obviously,but the main vibration direction is not cross-wind direction but along the structure axial.When the Angle is larger,small-amplitude resonance will occur at both resonant wind speeds.In addition,the test also shows that the resistance coefficient increases in cylindrical resonance due to the fluid-structure coupling effect;and when there is an angle between the wind axis and the structural axis,the lift coefficient is not 0.
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