Abstract: With the continuous development of manufacturing and drive technologies for electric motor, the electric motor is gradually taking the place of electro-hydraulic device, and becomes the preferred drive element of low and middle power level load simulators in the field of load simulation. There is similarity between the mathematical models of electric and hydraulic systems. The motor-hydraulic equivalent method is proposed, and the corresponding relation among the structure parameters of electric load simulator and the frequency domain characteristics of perturbance torque is obtained. The sweep test plays an important role in the electric load module test. According to the working conditions, a vector-based disturbance torque elimination method is put forward. The feasibility of the principle of the proposed method is verified by the AMESim simulation and the electric load simulation test stand. The test results show that the residual disturbance torque can be controlled within 1% of the rated load range (±15 N·m) of electric load simulator by the proposed method based on the amplitude-phase identification and genetic algorithm. Compared with other methods, the method is simpler, more flexible and adaptable. And it can be used to greatly improve the test accuracy of the load simulator suffered from the sinusoidal position disturbation.

Key words: experimental technology of aerocraft, motor-hydraulic equivalent method, vector matching, position disturbation, amplitude-phase identification