Friction Torque Measurement System and Precision Assembly Process for Arc-shaped Structure Seeker Servo Mechanism

For monitoring the friction torque and its inhomogeneity of arc-shaped structure seeker servo mechanism and adjusting its main influencing factors which are preload force and clearance during assembly, a measurement system for precision assembly is built. It is designed by principle of vertical structure in line and based electrical measurement. In the process of precise assembly, servo's performance can be controlled by monitoring drive torque of motor and adjusting assembly parameters. The influence of arc frame's mass-eccentric torque is analyzed and experimentally verified, and its interference is eliminated. The relationship between the preload forces of eccentric rollers and friction torque is experimentally verified, and the numerical range of preload forces is determined. The problem of automatic running process is solved, which is of great significance to reduce the fluctuation and inhomogeneity of friction torque. Based on the friction torque measurement system, the assembly process of arc-shaped structure seeker servo mechanism is optimized, and the qualitative method based on the experience of technician is optimized as a quantitative method based on measured torque.