【摘要】 针对高速旋转叶片振动导致的叶片裂纹甚至断裂而影响设备运行安全的问题，研究了叶片全域动应变与叶尖振动幅值的映射关系，提出一种透平叶片弯曲及扭转共振下叶片动应变非接触式测试方法，可实现基于叶尖振动幅值的叶片动应变反演，为叶片疲劳寿命预测奠定基础。首先，以某透平叶片为对象，对叶片进行模态分析获取全域应变和幅值比，进行叶尖振动测量点的优化；其次，运用振动台对叶片进行振动激励试验，获得叶片1阶、2阶共振下模态频率和应变-位移响应比，并对有限元分析模型进行修正。研究结果表明，所提出的叶片动应变测试应变-位移相对误差小于10%，频率误差小于1%，证明了叶片动应变测试方法的有效性。更多还原

【Abstract】 The blade crack and even fracture caused by high-speed rotating blade vibration seriously affect the equipment operation safety. The research on blade vibration characteristics, especially fatigue life, is of great significance. In this paper, the mapping relationship between blade global dynamic strain and blade tip vibration amplitude is studied, and a non-contact measurement method of blade dynamic strain under turbine blade bending and torsional resonance is proposed. Based on this method, the inversion of blade dynamic strain based on blade tip vibration amplitude can be realized, which lays a foundation for blade fatigue life prediction. Taking a turbine blade as the object, the modal analysis of the blade is carried out to obtain the global strain and amplitude ratio. The blade tip vibration measurement points are optimized. The vibration excitation test of the blade is carried out by using the shaking table to obtain the modal frequency and strain displacement response ratio under the first and second-order resonance of the blade. The results show that the relative error of strain displacement is less than 10% and the frequency error is less than 1%. The effectiveness of the blade dynamic strain test method is proved by small error results. It has certain guiding significance for blade parameter monitoring and model optimization.更多还原