摘要
桁架结构在大中型遥感相机中已被广泛应用。理想的桁架接头为铰接接头,但在实际工程应用中人们却经常采用刚性连接接头。为比较采用两种接头的桁架的整体刚度及支杆材料利用率,首先对桁架中常用的两脚架结构进行了分析。然后,以锯齿形四角架桁架为例,从理论上计算出了两种不同接头的桁架的基频及受前框自重时支杆的最大应力。结果表明,两种接头的桁架的整体刚度几乎一样,但采用铰接接头的桁架比采用刚性连接接头的桁架材料利用率高,支杆可节省重量约21.87%。最后,用Nastran软件进行了有限元分析。结果证明,该理论计算结果是正确的,两种计算结果的差别小于1.12%。
Truss structures are widely used in large- and medium-sized remote sensing cameras. The ideal joint for a truss is the hinged one. However, a rigid joint is often used in practical applications. To compare the stiffness and strut material utilization of the trusses using different joints, the bipod structures used commonly in trusses are analyzed firstly. Then, by taking a Serrurier truss as an example, the fundamentM frequency of the trusses using two different joints and the maximum stress yielded by the weight of their front frames are calculated in theory. The result shows that the trusses using two different joints have nearly a similar integral stiffness. But in material utilization, the truss using a hinged joint is better than that using a rigid joint. Its strut can save about 21.87% in weight. Finally, the finite element analysis is carried out by using the Nastran software. The analysis result shows that the theoretical calculation is correct and the difference between the two calculation results is less than 1.12%.
出处
《红外》
CAS
2013年第9期24-28,共5页
Infrared
