应变测试系统分流校准方法设计  

Design on Shunt Calibration Method for Strain Measurement System

作　　者：乔社娟[1] 邓利红[1] 王成[1] 王琪 

机构地区：[1]西安航空学院电子工程学院,陕西西安710077 [2]陕西四海测控技术有限公司技术研发部,陕西西安710075

出　　处：《测控技术》2016年第7期17-20,30,共5页Measurement & Control Technology

基　　金：西安航空学院航空发动机重点实验室基金资助项目(2014KY1105)

摘　　要：为了减小大型应变测试系统中长导线电阻带来的系统误差,提高多种试验切换效率,使系统在测试过程中具有更精确、更高效的特性,提出了一种结合分流校准电路和长导线电阻补偿算法的策略,根据应变片配桥方式和粘贴形态的不同,计算出实际的长导线电阻阻值与应变片静态阻值,采用计算值进行应变补偿取代了传统各种试验前必须使用高精密校准仪器对整个系统进行校准。理论分析及实验结果表明,这种策略能够准确计算出长导线电阻阻值和应变片静态阻值,采用计算值应变补偿效果达到满量程的0.09%以上,满足高精度需求,同时大幅度减小了传统试验前期的校准工作量,增大了试验范围,有效改善了系统测量精度和试验效率。In order to reduce the system error caused by long distance cable resistor in the large strain measurement system,and to improve the efficiency of various tests,a shunt calibration circuit and long distance cable resistor compensation algorithm is presented.Depending on the strain gauge bridge mode and location form,the actual resistance of long distance cable and the static resistance of strain gauges are calculated to replace calibrating whole-system by high-precision instrument,the calculated resistances are used to compensate strain value.Theoretical analysis and experimental results show that this strategy can accurately calculate the resistances of long distance cable and strain gauges,strain compensation effect is up to 0.09%of full scale,which gready reduces the workload of the test preparatory work,increases the test range,improves the measurement accuracy and test efficiency.

关 键 词：应变测试 分流校准 长导线电阻 应变补偿 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]