基于接触状态分析的叶冠阻尼评估与改进设计

采用基于接触状态分析的干摩擦阻尼结构设计方法,针对某型带冠涡轮叶片进行了阻尼评估与改进设计.接触状态包括接触形式和接触参数,通过接触形式从结构上判断结构设计的合理性;通过接触参数从力学性能上评价叶冠的阻尼效果.对叶片的动力特性、接触状态和振动响应进行综合评估分析,找出叶冠结构设计不足之处,并指出具体的改进措施,使叶冠的接触状态及振动响应得到一定的改善,并找到叶冠弦宽稳定工作范围.接触状态能够细致反映出叶冠工作状态下真实的接触情况,为叶冠结构设计和阻尼效果判定提供了更准确、详尽的参考依据.

Damping assessment and improving design of blade shrouds based on contact states

Damping assessment and improving design of a certain type of shrouded blades were conducted by applying the damping design method of sawtooth shroud based on contact states.Contact states included contact forms and contact parameters,in which contact forms could be used to judge the rationality of structure design;while contact parameters could be applied to evaluate the damping effect according to their mechanical properties.By generally assessing and analyzing the dynamic characteristics,contact states and dynamic response of the blade,the deficiencies of shroud structure design were found,and then the optimization measures which contributed to improve the contact states and dynamic response of the shroud were also proposed,also the stable operation range of chord width was obtained.The contact states could reflect the real contact conditions of shrouds when they are working,which can be regarded as a more accurate and detailed criterion for designing shroud structure and judging damping effects.