基于压电测力仪的模拟加载标定方法研究

Research on Calibration Method of Simulation Loading Based on Piezoelectric Dynamometer

在航空航天、高端装备制造领域,常伴随着大力值比载荷的产生,为监测其工作状态,需要对大力值比载荷大小、方向进行准确测量。该文以压电式力测试系统为研究对象,提出一种用于测力仪标定的旋转模拟加载方法。首先,基于力分解原理,结合标定装置的实际轴线与理论轴线的偏差原理,得到模拟加载过程中侧向合力随加载方位角变化的几何分布规律。针对侧向力理论波动的特点,提出一种新的模拟加载方法-旋转模拟加载法。最后设计了矢量力模拟加载实验,对测试系统应用非旋转模拟加载方法和旋转加载法进行试验对比。结果表明,应用旋转加载标定法时,测力仪侧向合力输出误差最大降低了18.7%F.S.,验证了旋转模拟加载方法的可行性和合理性。

In the field of aerospace and high-end equipment manufacturing,it is often accompanied by the occurrence of a large value ratio load.In order to monitor its working status,it is necessary to accurately measure the size and direction of large ratio load.In this paper,a piezoelectric force test system is taken as the research object,and a method of rotating simulation loading for dynamometer calibration is proposed.First,based on the principle of force decomposition,combing the principle of deviation between the actual axis and the theoretical axis of the calibration device,the geometric distribution law of lateral combined force with loading azimuth was obtained during the simulated loading process.Aiming at the characteristics of the lateral force fluctuation,a new simulation loading method-rotation simulation loading method was proposed.Finally,a vector force simulation loading experiment was designed.The experiments of non-rotation simulation loading method and the rotation on the test system was carried out and compared.The results show that the rotation load calibration method reduced the lateral total force output error by 18.7%F.S.,which verified the feasibility and rationality of the rotation simulation loading method.