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为探索超高速摄影仪转镜的设计,提出了系统性的转镜动力学性能设计理论和方法。结合静力学和动力学理论,利用有限元分析软件对初始设计的转镜进行静强度、模态、谐响应、固有频率灵敏度进行数值分析,并对数值分析结果进行试验验证,根据分析结果反复修改相应的转镜的结构尺寸并设计新的转镜,对新设计的转镜进行交变力疲劳分析和试验。结果发现,初始设计转镜的最大应力小于转镜材料的屈服强度,转镜不会出现静强度失效;转镜一阶临界转速落在工作转速以内,其动力学特性不满足要求;镜体外接圆半径与转镜的固有频率负相关且相关程度最高;新转镜的一阶固有频率从459.4Hz增大到713.6Hz,变化率55.3%,转镜的一阶临界转速达到42 816r/min,成功地避开了共振点,且疲劳强度满足设计要求。
In order to explore the design of the ultra-high-speed camera rotating mirror, a systematic design theory and method of rotating mirror dynamics was proposed. Based on the theory of statics and dynamics, the finite element analysis software is used to analyze the static strength, mode, harmonic response and sensitivity of natural frequency of the rotating mirror of the initial design. The numerical analysis results are verified by experiments and repeatedly revised according to the analysis results Corresponding to the structure of the rotating mirror size and design a new mirror, the new design of the rotating mirror fatigue analysis and testing of alternating force. The results show that the maximum stress of the initial design rotary mirror is less than the yield strength of the rotary mirror material and the static failure of the rotary mirror does not occur. The first critical rotation speed of the rotary mirror falls within the working speed and its dynamic characteristics do not meet the requirements. The first-order natural frequency of the new rotary mirror increased from 459.4Hz to 713.6Hz, the rate of change was 55.3%. The first-order critical speed of the rotary mirror reached 42 816r / min, Successfully avoided the resonance point, and fatigue strength to meet the design requirements.