基于加速度计阵列的六自由度振动台测试方法研究

Research on Measurement Method of Six Degrees of Freedom Vibration Table Based on Accelerometer Array

目前多自由度振动台缺乏方便有效的多自由度振动测试手段,通过探讨基于加速度传感器的六自由度振动测试方法,提出基于4只三向加速度计的加速度计阵列构型,依据六自由度运动系统方程对该构型的运动状态进行了理论推导,并设计了具体的封装方法,最后对封装的加速度计阵列构型进行了多自由度振动测试试验验证。试验结果表明:所提出的基于4只三向加速度计的加速度计阵列构型能够对角加速度进行测试与还原,简易可靠,可以作为多自由度振动的测试手段。本文提出的加速度计陈列构型有望被推广应用于现场低频振动测量或校准工作中。

The multi-degrees-of-freedom vibration table lacks a convenient and effective method to measure the multi-degrees-of-freedom vibration at present. This article discussed the six degrees of freedom vibration testing method based on the acceleration sensor, and proposed an accelerometer array configuration based on four three-direction accelerometers. The motion state of the configuration is theoretically deduced according to the six degrees of freedom motion system equations, and the specific packaging method is designed. Finally, the encapsulated accelerometer array configuration is verified by the multi degrees of freedom vibration test. The test results show that the proposed accelerometer array configuration based on four three-direction accelerometers can test and restore the angular acceleration. The method is simple and reliable, and can be used for multi degrees of freedom vibration test. It is expected to be widely used in on-site vibration measurement and calibration.