超高速摄影中弹性支撑转镜的模态分析

 提出了超高速摄影仪中弹性支撑转镜模态分析方法，利用有限元法对三面体铝合金转镜刚性支撑和弹性支撑情况下的一、二阶模态进行模拟，结果表明：电驱动转镜在转速工作范围内只有2个临界点，分别位于2.5×10⁵~2.6×⁵ r/min和2.6×10⁵~2.7×10⁵ r/min处， 并且均为一阶弯曲振动，一阶模态振动发生在垂直平面内，二阶发生在水平平面内。将模拟结果与实测值进行了比较，发现假设转镜为弹性支撑与实测值吻合得较好。

Modal analysis of rotating mirror clipped by the elastic bearings for ultra-high speed photography

The modal analysis method studying the elastic support rotating mirror for ultra-high speed photography was presented. With the finite element technology，the first and second modes of the three-faced aluminum alloy mirror were simulated under the stiff and elastic bearings condition. The simulation results show that the only two resonance points are in the speed ranges of 2.5×105 to 2.6×105 r/min and 2.6×105 to 2.7×105 r/min respectively, both resonances are first order flexure vibrations. The vibration of the first order modal occurs in vertical plane and that of the second occurs in level plane. The simulation results under the elastic supporting hypothesis are more close to that of the experimental results.