首页> 中文期刊>深圳大学学报(理工版) >超高速摄影仪转镜模态数值仿真分析

超高速摄影仪转镜模态数值仿真分析

     

摘要

The research objective of this paper was to verify the accuracy of numerical approach for the ultra-high speed camera rotating mirror system by numerical simulation and modal test. Numerical analysis was done to obtain the first three modal and study their corresponding vibrations and modal stress. It is found that the main resonance points are concentracted in the 304. 37 Hz, 354. 12 Hz and 354. 17 Hz, the first-order bending stress is far greater than the first-order torsion stress and the shaft shoulder is the region of stress concentration. Afterwards, the modal test was done to obtain the amplitude-frequency response during the accelerating process of the rotating mirrors. From the amplitude-frequency curves, it can be seen that the amplitudes of rotating mirror differ greatly at those natural frequencies and the peak amplitude at 355 Hz is much larger than that at 297 Hz. It is shown that the fist-order bending is the main damage form, and the shaft damage is the main cause of the fatigue failure of the rotating mirror. The results from the numerical and experimental analysis are consistent, so the numerical analysis for extracting the modal of the rotating mirror is reliable and highly accurate.%采用有限元法对超高速摄影仪转镜系统进行数值仿真与模态测试,验证转镜模态数值分析方法的精度.利用数值分析法,提取转镜的前3阶模态,研究其对应振型与模态应力,发现其共振点主要集中在304.37 Hz、354.15 Hz和345.17 Hz处,且1阶弯曲模态应力远大于1阶扭转应力,轴肩位置是应力集中区.通过实验在线测得转镜在加速过程中的幅频响应曲线,发现转镜在固有3个频率点处振幅出现急剧变化,且在355 Hz处的振幅远大于其在297 Hz处的振幅.结果表明,1阶弯曲是转镜出现破坏的主要形式,轴的损伤是转镜出现疲劳破坏的主要原因.数值解和实验结果吻合较好,说明对转镜采用数值分析法提取其模态可获得较高精度.

著录项

相似文献

  • 中文文献
  • 外文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号