Nonlinear adaptive torque control of electro-hydraulic load system with external active motion disturbance

Disclosed are a hydraulic control arrangement for controlling a hydraulic consumer and a running with at least one such a control arrangement mobile control block, wherein in the supply to the consumer and in the return flow from the consumer are each a Verntilschieber for adjusting the inflow and outflow cross-section is arranged. Two valve slides on the pump side is connected upstream of an individual pressure balance, via which the pressure medium flows to a vapor controlled by a valve spool supply measuring orifice.

Hydraulic control system and control block

Adaptive velocity synchronization compound control of electro-hydraulic load simulator

An experimental study of the dual-loop control of electro-hydraulic load simulator (EHLS)

This paper investigates on the high performance torque control of electro-hydraulic load simulator (EHLS). In order to suppress actuator's motion disturbance, a nonlinear robust dual-loop control scheme is developed, which consists of a open-loop nonlinear velocity feed-forward compensator and a closed-loop nonlinear deterministic robust torque controller. The main function of the open-loop compensator is to decouple actuator's active motion disturbance, whereas the torque loop controller aims at guaranteeing the dynamics performance of tracking torque reference. Besides actuator's motion disturbance, both the nonlinearity characteristics and friction problem of the EHLS system are taken into consideration in this paper. The effectiveness of the developed method are verified through comparative co-simulations and experiments.

Nonlinear robust dual-loop control for electro-hydraulic load simulator.

The superfluous force exists in the electro-hydraulic servo rudder load system, and seriously affects the dynamic load precision of the system. Meanwhile, the superfluous force makes the stability of the system bad, let frequency width dwindle, and reduces the load sensitivity of the system. Aiming at these questions and in order to improve the control performance of the load system of the electro-hydraulic load simulator, furthermore, for the sake of solving the superfluous force this technical problem caused by the forced flow, the author proposes the method of adopting the flow servo valve and the flow-press servo valve concurrent control the electro-hydraulic load simulator load system. This method makes the flow-press servo valve as a flow compensation tache, and changes the electro-hydraulic force servo system with strong position disturbance to the electro-hydraulic force servo system without disturbance. Then the author studies the electro-hydraulic force servo system on building its model, simulation and experiment and the result of the study shows that the superfluous force obviously decrease when the double valve concurrent control method adopted to the load system. At the same time, the dynamic load precision of the load system is obviously improved.

Zhongwen WangBo

Papers

Study of the electro-hydraulic load simulator based on double servo valve concurrent control