大规模应变监测值获取技术研究

Research on monitoring data acquisition of massive strain gauges

针对全机静强度试验过程中获取应变监测值的问题,提出一种适用解决该问题的方法。全机静强度试验过程中,需要对一万个左右的应变片进行监控。在试验之前,需要提供试验工况下每个应变片的理论计算值作为监测值,筛选出重点关注部位,方便与试验值进行对比。由于应变片数量大,根据有限元结果,手工获取应变监测值效率低且易出错。从应变变换和应变插值的基本理论出发,详细介绍了快速获取应变监测值的方法,并基于HyperWorks有限元前后处理软件开发出一套应变监测值获取工具,实现了在单元面内和面外对应变进行插值,提高了应变监测值计算精度,克服了传统基于自然网格有限元模型方法带来的计算繁琐、效率低、局部计算精度不足的缺点,大大降低了应变监测值数据的准备难度。

In the article,an innovate method is presented in order to solve the problem of monitoring data acquisition of massive strain gauges during the aircraft static strength test.There are over 10 thousands of strain gauges mounted on the aircraft,which need to be monitored.Before the test,according to the finite element model analysis,the monitoring data from the strain gauges must be supplied,and the focus areas are screened out for comparison with experimental results.Due to the large amount of strain gauges,manually calculating the monitoring data can be a tough and error prone task.In this article,based on strain transformation and interpolation,more details of monitoring data acquisition are introduced step by step.Besides,a tool is developed on HyperWorks with the feature of improving the accuracy of monitoring data by using the in-plane and outer-plane interpolations.The method overcomes the shortcomings of cumbersome calculation,low efficiency,and insufficient local calculation accuracy brought by the global finite element model(GFEM),and greatly reduces the difficulty of preparing monitoring data.