Abstract: As the core single machine in the solid rocket navigation control system, the performance of the electric servo mechanism plays a decisive role in the flight safety of aerospace equipment. To achieve the loading test of the electric servo mechanism in the aerospace equipment navigation control system, a design scheme of an electric servo mechanism test bench with linear loading is proposed. By offsetting the additional servo mechanism, the real-time variable simulated load is realized to replace the physical load, and various working conditions and nonlinear load simulations are completed. The design scheme of this test bench has certain challenges. The tested electric servo mechanism and the loading servo are prone to mutual damage during the backlash. To achieve both normal functions and the expected simulated load, the drive control of the test bench is extremely important. Therefore, a drive control method is proposed. High-precision simulation of the expected working conditions can be achieved by regulating the coupling ratio of the servo motor. Based on the above scheme, the mechanical structure and control system for the linear loading of the test bench are designed. By installing temperature, vibration and other sensors and through dual-motor synchronous control, the performance of the tested electric servo mechanism under various load simulation conditions can be achieved. The test results show that the test bench can simulate the nonlinear load conditions of the electric servo mechanism aerospace equipment during flight, and feedback the operating status of the electric servo mechanism system through real-time data collection, which greatly reduces the test cost and contributes to the safe flight of aerospace equipment.

Key words: electric servomechanism, test bench, linear loading, load simulation, control system