目的 针对公路运输共振引起精密仪器内部元器件失效问题,以精密仪器减振运输系统减振支架为研究对象,利用仿真分析和模态试验法开展支架关键部件旋转云台结构对模态的显著性分析,确定约束共振状态的优化方案。方法 首先对整体模型进行静力学仿真分析,找到其应力集中部位。其次,在模态分析模块中得出前6阶固有频率。最后,通过调整旋转云台支撑支架的边界条件,对原模型的振型进行约束优化。结果 优化后减振支架的初始固有频率由6.1 Hz提高到13.3 Hz,避免了运输系统的共振频率落在外部激励频率范围。结论 优化后减振支架设计具备一定的强度和恰当的模态特性,能够稳定运行,满足避开公路运输激励频率范围,实现对精密仪器的有效减振。本文分析结果为改进公路运输装置减振设计、提高其工作稳定性提供了依据。
Abstract
In order to solve the problem of internal component failure in precision instruments caused by resonance during road transportation, the work aims to take the vibration reduction bracket of the precision instrument vibration reduction transportation system as the research object and employ simulation analysis and modal testing methods to conduct a significance analysis on the modal properties affected by the rotating platform structure, a key component of the bracket, so as to determine the optimization plan for constraining the resonance state. Firstly, the static simulation analysis was carried out to the entire model to identify the stress concentration areas. Subsequently, the first six natural frequencies were obtained from the modal analysis module. Finally, by adjusting the boundary conditions of the support bracket, the vibration modes of the original model were optimized. The initial natural frequency of the vibration reduction bracket increased from 6.1 Hz to 13.3 Hz after optimization, thereby avoiding the resonance frequency of the transportation system from falling within the external excitation frequency range. The optimized vibration reduction bracket design has sufficient strength and appropriate modal characteristics, ensuring stable operation and effectively avoiding the excitation frequency range of road transportation. This achieves effective vibration reduction for precision instruments. The analysis results of this study provide a basis for improving the vibration reduction design of road transportation devices and enhancing their operational stability.
关键词
精密仪器 /
减振运输 /
仿真分析 /
设备改进
Key words
precision instruments /
vibration reduction transportation /
simulation analysis /
equipment improvement
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