应变天平测量电路退化及失效检测技术

Degradation and failure detection technology on strain balance measuring circuit

针对振动、温度应力等引起的风洞应变天平检测电路(惠斯登电桥)的退化或失效,提出一种检测方法。基于不同时刻在电桥不同节点施加激励并测量其响应,通过理论计算实现电桥的参数解析,基于聚类实现失效检测。研制了原理样机,并开展实验研究,实验结果表明该方法有效,可以实现电桥的失效检测,电桥电阻的测量精度可以达到0. 2‰以上。基于该方法设计的样机,可以实现应变天平检测电路的退化及失效的自动检测,节省故障诊断时间,提高风洞试验的可用时间。

Aiming at the degradation and failure caused by vibration,temperature cycling and etc in strain balance’ s measuring circuit( Wheatstone bridges),a detection method was presented. In the method,the bridge was driven on different nodes at different periods and the responses were measured. The bridge’s parameters were calculated on the basis of the theoretical calculation,and its failure was detected on the basis of the clustering method. A principle prototype was developed and the experiment research was conducted. Experiment results show that the presented method is effective,and it can indeed detect the failure and its test accuracy of bridge resistance can reach 0. 2‰. The designed prototype realizes the auto-detection of degradation and failure of strain balance measuring circuit,which costs less time consumption than traditional test method and lifts the available time of the wind tunnel test.