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设计一套涡轮带冠叶片干摩擦阻尼减振试验系统,并利用该试验系统对阻尼块与叶冠之间不同接触紧度、不同接触面积以及采用不同材料阻尼块时涡轮叶片动力特性和减振效果进行了分析研究.结果表明接触紧度、阻尼块的接触面积、材料以及外部激振力共同影响涡轮叶片的减振效果,共同决定该系统是否存在最优正压力以及最优正压力存在时的范围或大小.另外,激振力的变化将导致叶片的响应、系统阻尼比、共振频率以及最优正压力等一系列参数变化.试验结果能够为理论计算提供数据验证,为指导涡轮带冠叶片的减振设计提供依据.
A set of turbine friction damping vibration damping system with crown blades was designed and used to test the dynamic characteristics and damping effect of the turbine blades with different contact intensities and different contact areas between the damping block and the blade crown, The results show that the contact tightness, the contact area of the damping block, the material and the external excitation force all affect the damping effect of the turbine blade and jointly decide whether the system has the optimal positive pressure and the range of the optimum positive pressure exists Or size.In addition, the change of exciting force will lead to a series of parameters variation of blade response, system damping ratio, resonant frequency and optimal positive pressure, etc. The results of the experiment can provide data verification for theoretical calculation.To guide the turbine with crown blades Vibration damping design to provide the basis.