大跨度结构气弹模型风振响应的阻尼修正系数

在气动弹性模型设计中 ,如果阻尼相似不能在模型设计、制作中实现 ,则须对试验结果加以修正 .因此定义了阻尼比修正系数 ,推导出结构在Davenport脉动风速 (风压 )谱激励下响应和阻尼比的相互关系 ,通过一刚度可调的结构模型 ,分析了大跨度结构气弹模型实测各阶阻尼比相近情况下激励形式和结构模态参数对模型风振响应阻尼比修正系数的影响 .

Correction for Damping Ratio of Wind-induced Dynamic Responses for Structural Aeroelastic Model

In designing an aeroelastic structure model,if required damping ratio can not be achieved in the designing and manufacturing of an aeroelastic model,a proper correction for the dynamic response is needed.A damping ratio correction factor is thus defined and the relationship between structural dynamic response and damping ratio under the excitation of Davenport-style wind pressure spectrum is presented in this paper.A tuned rigidity model is designed for theoretically investigating the influence of excitation form and modal parameters on the damping ratio correction factor on the assumption that the concerned-mode damping ratios of the aeroelastic model are close to each other.