【摘要】 为在不获得叶片详细属性的情况下得到叶片的等效阻尼比及其与响应幅值的变化关系，提出一种基于牵引式加载的叶片等效阻尼比计算方法。基于振动理论，分析叶片在不同周期性激励作用下的响应特性，构建等效阻尼比、变形量和稳态振幅之间的映射关系。采用牵引式设备对3支大型叶片进行阶梯加载并计算其各阶段振幅下的等效阻尼比，揭示叶片等效阻尼比与稳态振幅的近线性关系，在满载阶段叶片的等效阻尼比达到小振幅下的2～3倍，同时将计算结果与自由衰减法计算结果进行对比，验证基于牵引式加载计算叶片等效阻尼比方法的可行性和适用性。更多还原

【Abstract】 To obtain the equivalent damping ratio of the blade and its variation relationship with the response amplitude without acquiring detailed blade properties, a calculation method for the equivalent damping ratio of the blade based on traction loading is proposed. Based on vibration theory, the response characteristics of the blade under different periodic excitation are analyzed, and the mapping relationship among the equivalent damping ratio, deformation, and steady-state amplitude is constructed. Three large blades are loaded in steps using Tug Fatigue Testing system, and the equivalent damping ratios under various stages of amplitude are calculated, revealing the nearly linear relationship between the blade’s equivalent damping ratio and the steady-state amplitude. At the full-load stage, the equivalent damping ratio of the blade reachs 2-3 times that under small amplitudes. Additionally, the calculated results are compared with those obtained from the free decay method, verifying the feasibility and applicability of the method for calculating the blade’s equivalent damping ratio based on traction loading.更多还原