应变式多维力传感器的故障诊断方法与实现  

Fault diagnosis method and realization for strain gauge multi-axis force sensor

作　　者：杨双龙[1] 徐科军[1,2] 舒张平 许伟[1] 

机构地区：[1]合肥工业大学自动化研究所,合肥230009 [2]工业自动化安徽省工程技术研究中心,合肥230009

出　　处：《电子测量与仪器学报》2016年第9期1361-1371,共11页Journal of Electronic Measurement and Instrumentation

基　　金：中央高校基本科研业务专项(JZ2015HGBZ0132;JZ2015HGQC0199)资助

摘　　要：针对应变式多维力传感器在应用中往往出现测量电路的短路、断路、虚短、虚断等故障问题,提出基于恒流激励与矩阵扫测的故障诊断方法。针对短路故障,提出采用恒流扫测传感器输出引线与传感器基体之间以及传感器的两两输出引线之间阻值的方法来进行故障诊断;针对断路故障,对传感器各通道进行独立诊断,给出了恒流矩阵扫测方式,建立了断路故障查询表,以根据扫测结果采用查表法进行故障诊断;针对虚短、虚断故障,采取多次循环扫测、根据故障出现次数来辨别判断。据此,以MSP430F5529单片机为核心研制了低功耗电池供电式应变多维力传感器故障诊断系统,适用于多至8个通道的多维力传感器。测试结果表明,所研制的故障诊断系统针对简单故障或较为复杂的故障情况均可通过一次自动诊断或自动诊断与人工排查相结合的多次诊断方式来正确地判断出故障类型和位置,且8通道故障诊断耗时仅需约13 s,从而能够大幅缩短应变式多维力传感器的故障排查时间,提高传感器维护效率。Aiming at the failure problems of short-circuit, break-circuit, virtual short, and virtual break of the measurement circuit of strain gauge multi-axis force sensor that may come out in application, constant-current excitation and matrix sweep-measurement based fault diagnosis method is proposed in the paper. Particularly, for diagnosing the short-circuit fault, constant-current sweep-measurement of the resistance between the lead-out line and the rigid-body of the sensor and the resistance between any two lead-out lines of the sensor is conducted and evaluated ; for the break-circuit fault, each channel of the sensor is diagnosed individually, constant-current matrix sweep-measurement pattern is given and the look-up table of break fault is established, so what the break fault can be diagnosed by lookup-method according to the sweep-measurement results; for the faults of virtual short and virtual break, muhicycle sweep-measurement is implemented, and the failure frequency is employed for identifying the faults. Accordingly, adopting the single chip machine MSP430F5529 as the core, a low-power battery-powered fault diagnosis system for strain gauge multi-axis force sensor is developed, and is applicable for the multi-axis force sensor with up to 8 channels. The experimental results show that the developed system can identify and position the faults correctly by one-time auto diagnosing for simple faults or hybrid diagnosing combining auto diagnosing with artificial troubleshooting for complex faults. In addition, the diagnosis time-consuming for 8 channels is just about 13 seconds. It indicates that the developed system can largely shorten the troubleshooting time of the strain gauge multi-axis force sensor, and improve the sensor maintenance efficiency.

关 键 词：应变式多维力传感器 测量电路 故障诊断 恒流激励 矩阵扫测 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置] TN06[自动化与计算机技术—控制科学与工程]