Surplus torque is restrained efficiently.

But in ground simulation,surplus torque makes simulation results unreliable.

Because of the coupling of torque control and position control in a passive electric loading system,the movement of the object will bring torque control error that is called surplus torque and will deteriorate the dynamic performance of torque control if not compensated.

After the disturbance torque is compensated according to the invariance theory,the system can still not meet the requirement.

The analysis of simulation result show that some rules how to select impor- tance parameter should be complied with and the controller has excellent performance and a satisfying ability to decrease the disturbance torque.

According to characteristic of synchro-compensation eliminating disturbance torque for electro-hydraulic loading simulator, referring to the method of model reference adaptive control system, this paper takes steering as referring model, synchro-motor as controlled system to improve the precision of synchro-compensation and eliminate disturbance torque at most.

Mechanism and suppression of extraneous torque of motor driver load simulator;

By analyzing the mechanism of production of the extraneous torque,the extraneous torque compensation and adjustment are made.

The connect rigidity is analyzed which influences the performance of whole simulator, including stability、machine resonance and extraneous torque.

In this paper the mechanism of additional torque in the Electro-Hydraulic Servo Loading System (EHSLS) is analyzed, and the mathematic model of EHSLS is also established.

By example analysis, the equivalent length η of superfluous moment of grousers iscalculated ; the four calculation factors affecting η are analyzed and compared, obtaining therelationship and influence between spring displacement and grouser d.