摘要
针对螺栓拉应力仅能测量螺栓连接零件受到的拉力,而无法测量压力的局限,在螺栓连接的两零件之间引入了高刚度弹性元件,并利用无线应变测试系统,通过测量螺栓因弹性变形产生拉力F的变化,实现了复杂工况下螺栓连接零件受拉压外力Fe的无线测量。设计、制造了测力螺栓和弹性元件;采用ANSYS软件分析了弹性元件的压应力及变形量,通过正交设计法优化了弹性元件的结构。建立了测量方法的计算模型,得到了测力螺栓受拉力F与螺栓连接零件所受的拉压外力Fe的关系,进行了不同预紧力下螺栓连接零件受拉压外力Fe的实验验证。研究结果表明,凹槽深度和单侧凹槽数量是影响弹性元件性能的关键因素。螺栓连接零件受拉压外力可以实时、准确地得到测量,零件受拉压外力与测力螺栓处受力为线性关系。
Aiming at the limitation that using the tensile stress of bolt could only measure the pulling external-force loaded on the elements connected by bolt, but not the compressive external-force, a high stiffness elastic element was added between two elements connected by bolt, using the wireless strain measurement system, the pulling and compressive external-forces Fc loaded on the element were measured by measuring the pulling force of bolt F from elastic deformation. The bolt for measuring force and the elastic element were designed and manufactured. The compression stress and deformation of the elastic element were analysed with ANSYS and the optimal design was determined by orthogonal design. The calculation model of measurement method was established so that the relationship between Fe and F was obtained. Then the replication experiments that the element was loaded Fo under different pretension were carried out. The results indicate that the groove depth and the number of single-sided grooves are the key factors that affect the performance of elastic element. The pulling and compressive external-forces loaded on the element can be measured accurately in real time, and the relationship between Fe and F is linear.
出处
《机电工程》
CAS
2014年第7期860-864,共5页
Journal of Mechanical & Electrical Engineering
关键词
无线测量
弹性元件
拉压实验
wireless measurement
elastic element
tension and compression test
