超低频标准振动系统基础设计技术

DESIGN OF FOUNDATION FOR STANDARD VIBRATION SYSTEMS WITH ULTRA-LOW-FREQUENCY

针对超低频标准振动系统易受外界振动干扰的问题,研究了超低频标准振动台与激光测振仪的隔振基础设计技术。首先以振动台台面输出信噪比为出发点,确定了超低频标准振动台基础噪声的基本要求;然后采用有限元分析的数值方法,分别对振动台基础与激光测振仪基础作动力学分析,再对激光测振仪基础作静力学分析。结果表明,振动台基础底面应与地基刚性连接,而激光测振仪基础底面应与地基弹性连接;优化橡胶减震垫的布局可以提高激光测振仪隔震系统的稳定性。

Considering influence of external vibration on ultra-low frequency standard vibration systems, the vibration insulating foundation for vibration tables and a laser vibrometer is studied. Starting from the output signal-to-noise ratio of vibration tables, the basic requirements of background noise of the foundation are determined, then the dynamic analysis of the foundation for tables and a laser vibrometer, and the static analysis of the foundation for the laser vibrometer are done with finite element method. Research results show that the bottom surface of the tables should rigidly be fixed with ground base, and the bottom surface of the foundation of the laser vibrometer should elastically be fixed with ground base. At last, the stability of the laser vibrometer system could be improved by optimizing the placement of anti-shock rubber pads.