有强弱轴之分的悬臂圆柱气动弹性试验研究
Experimental study on aeroelasticity of cantilever cylinder with strong and weak axes
梁敬凯 1陈凯1
作者信息
- 1. 建筑安全与环境国家重点实验室,北京 100013;中国建筑科学研究院有限公司,北京 100013
- 折叠
摘要
设计了具有强弱轴之分的悬臂圆柱气动弹性模型试验.多风向角、多风速的试验结果表明,模型的两个固有频率对应了两个共振风速.当风轴与结构轴一致时,将发生典型的"横风向涡激共振";而当风轴与结构轴存在夹角时,虽然圆柱表面气动力是对称的,但其振动特性却随风向变化而有所不同.在小夹角情况下,圆柱仍会发生明显的涡激共振,但主振方向并非"横风向"而是沿结构轴向;夹角较大时,则在两个共振风速下均会产生小振幅的共振.此外,试验还表明,由于流固耦合效应的影响,阻力系数在圆柱共振时有所增大;而当风轴和结构轴有夹角时,升力系数不为0.
Abstract
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.
关键词
悬臂圆柱/涡激振动/气动弹性试验/流固耦合Key words
cantilever cylinder/vortex-induced vibration/aeroelastic test/fluid-structure coupling引用本文复制引用
基金项目
国家重点研发计划(20220122370736030)
出版年
2024
NETL
NSTL
万方数据