发动机试验台测力机构柔性梁设计研究  

Research on Flexible Beam of Force Measuring Mechanism of Engine Platform

作　　者：杨中艳[1] 苏浩[1] 刘丹[1] 孙侃[1] 尹世博 Yang Zhongyan;Su Hao;Liu Dan;Sun Kan;Yin Shibo(The Second Research Institute, China Academy of Aerospace Aerodynamics, Beijing 100074, China)

机构地区：[1]中国航天空气动力技术研究院第二研究所,北京100074

出　　处：《航空工程进展》2017年第4期465-470,485,共7页Advances in Aeronautical Science and Engineering

摘　　要：柔性梁的刚度性能影响风洞盒式应变天平的精准度,是发动机试验台测力试验数据精确可靠的重要保证,而柔性铰链更是柔性梁设计的关键所在。首先,借助有限元分析方法对四种典型柔性铰链进行计算分析,优选出综合刚性最好的柔性铰链形式;其次,基于选择的柔性铰链形式,研究三个关键结构参数对铰链刚度的影响;最后,设计五种不同厚度的柔性梁进行有限元分析,并加工实物模型进行加载试验验证。结果表明:铰链宽度b=40mm、半径R=5mm、最小厚度t=4mm时双圆弧柔性梁的综合刚度最好,且侧向柔度大,轴向刚度优;有限元计算值和试验值吻合良好,误差小于5%,表明将有限元方法运用于柔性梁的设计优化是可行、可靠的。The flexible beam’s stiffness performance directly affects the accuracy of wind tunnel cassette strain gauge balance,and it is an important guarantee for accuracy of test data of engine test bench,whereas flexible hinge design is the key of flexible beam design.Firstly,four kinds of typical flexible hinges are analyzed by finite element method,and one flexible hinge which has good integrated stiffness is selected.Secondly,for selected hinge style,the influence of three key structural parameters on hinge stiffness performance is researched.Finally,basis on above research,five kinds of min thickness flexible beams are designed and analyzed by finite element method,and their stiffness performance are validated by loading test.The result shows that the hinge width b=40mm,radius R=50mm and min thickness t=40mm can get best stiffness performance,in addition,there is a good agreement between calculation and test(the maximum error is less than5%).It indicates that by using the finite element method,the design and optimization of flexible beam are feasible and reliable.

关 键 词：发动机试验平台 柔性梁 柔性铰链 应变天平 刚度 有限元分析 

分 类 号：V211.72[航空宇航科学与技术—航空宇航推进理论与工程]