摘要
在应变法飞机结构载荷测量中,应变电桥在飞机结构上的布置方式是载荷准确测量的关键影响因素,但随新结构及新材料在飞机设计制造中的应用,采用飞行器结构力学方法对受载结构定性分析以确定应变电桥布置方案的方法难以满足载荷高效精准测量的要求。针对该问题,基于空间应变理论及有限元仿真方法提出了虚拟电桥应变计算方法,在飞机结构有限元模型上构建虚拟电桥,通过虚拟电桥应变响应对其进行受载响应特性评估,以保证真实条件下以该方式布置的电桥可准确反映待测载荷。采用该方法对某起落架结构载荷测量电桥进行计算,与试验结果对比表明,该方法计算结果准确,可为应变改装提供有效量化依据,提升载荷测量精度及效率。
When measuring the aircraft structural load with strain gauge,the arrangement of the strain bridge on the aircraft structure is the key influencing factor on the accuracy of the measurement.With the application of new structures and new materials in aircraft design and manufacturing,the structural mechanics method for qualitatively analyzing the loaded structure to determine the strain bridge layout cannot meet the requirements of efficient and accurate load measurement.Therefore,we proposed a virtual strain bridge calculation method based on spatial strain theory and finite element simulation method.Virtual bridges were built on the finite element model of the aircraft structure,and the load response characteristics of the virtual strain bridge was evaluated to make sure that the bridge arranged in this way under real conditions could accurately reflect the load to be tested.This method was used to calculate the load bridge of a landing gear structure and was proved accurate.This method could provide effective quantitative basis for the arrangement of strain bridge,and could improve the accuracy and efficiency of load measurement.
作者
唐宁
白雪
TANG Ning;BAI Xue
出处
《现代机械》
2020年第2期89-93,共5页
Modern Machinery
关键词
虚拟电桥
有限元法
应变法
飞机结构载荷
virtual strain bridge
finite element method
strain method
aircraft structural load
