套筒式张线天平的研制

根据民机张线测力试验的特殊要求,研制了一台套筒结构形式的张线天平.详细介绍了该天平在研制中遇到的难点、关键技术的解决措施以及研制的结果.天平元件布置在φ58mm的外套筒上,内杆直径为φ44mm,外套筒和内杆通过楔块焊接在一起.法向力、俯仰力矩和滚转力矩为拉压变形,横向力和偏航力矩为“S”形变形,轴向力为弯曲变形,元件支撑部分受拉压变形且刚度较强.通过对天平进行有限元分析,在法向力和俯仰力矩作用下,得出的应变结果与实际输出基本吻合.风洞试验结果表明:天平设计合理,天平外套筒、内杆及张线支撑系统刚度好,天平各分量测量精度高.

Development of sleeve type wired balance

According to the special requirements for aerodynamic loads tests of a civil aircraft model in wind tunnel,a wired balance of sleeve type is developed.This paper describes the encountered difficulties,the solution of key technology and the research results.The balance components are placed on the outer sleeve of 58mm in diameter,the diameter of inner rod is 44mm,and the outer sleeve and inner rod are joined together by welding around wedges.The components of normal force,pitching moment and rolling moment are pulled or pressed,the components deformation of side force and yaw moment are in ’S’ types,and the component of axial force is deformed by bending.The supporting part on the components is pulled or pressed and has a good rigidity.By FEM,the strains of normal force and pitching moment are consistent with the calibration outputs.The test result shows that: the design of wired balance is reasonable,the system has a good rigidity composed of the outer sleeve and inner rod and wired support,and the measurement accuracy of each component of the balance is high.