带惯性力修正的循环力校准方法研究  

Research on Calibration Method of Cyclic Force with Inertial Force Correction

作　　者：田峰[1] TIAN Feng(Changcheng Institute of Metrology&Measurement,Beijing 100095,China)

机构地区：[1]航空工业北京长城计量测试技术研究所,北京100095

出　　处：《计测技术》2020年第1期66-73,共8页Metrology & Measurement Technology

基　　金：航空科学基金资助项目(2015ZD44007)。

摘　　要：疲劳试验设备对试样施加的力值,在静态和动态时的准确度不一致。本文通过建立疲劳试验设备的物理振动模型,得出循环力的误差主要是由传感器与试样间的参振质量的惯性力引入的;推导出了惯性力对循环力幅值的影响量模型,经过对惯性力影响量的修正,最终实现了疲劳试验设备的显示力值与试样的实际受力值一致的目的。采用加速度法、刚度/位移法修正方式,建立带惯性力修正的循环力校准系统,通过比对试验和数据分析,得到了两种修正方法(加速度法、刚度/位移法)以及两种校准方法(传感器法、校准棒法)之间的结果差异小于1%,验证了惯性力修正模型的有效性。The accuracy of dynamic force applied on specimen by fatigue test equipment is not the same as that of static force,and this perplexes testers and calibrators for a long time.By establishing physical vibration models of fatigue testing equipment,it is concluded that the error of cyclic force is mainly caused by the inertia force of the vibration mass between machine sensor and sample,which are not at the same position.Correction models of inertia force’ s influence on cyclic force amplitude are deduced.After the inertia force influence is corrected,the display force of the fatigue test equipment is consistent with the actual force on the sample at last.The cyclic force calibration system with inertia force correction is established using the acceleration method and the stiffness/displacement method.By way of comparison test and data analysis,both the difference between two correction methods(acceleration method,stiffness/displacement method) and the difference between two calibration methods(sensor method,calibration bar method) are less than 1%.The validity of the inertial force correction model is verified.

关 键 词：校准 动态 疲劳 循环力 惯性力 修正 

分 类 号：TB931[一般工业技术—计量学]