In this paper, the principle of electro-hydraulic proportional control system are introduced, electro-hydraulic velocity control system are designed and can realize volevity control with high accuracy. In the system, relative amplitude abundant degree and phasic abundant degree and corresponding frequency of passing of Body system is easily obtained under different open ring gain of K, thus it ...

According to the steering mode of self-propelled modular transporter, the key component of the steering system with electro-hydraulic proportional directional valve was designed. The model of the transporter steering single loop system was established through the method of power bond graph and was simulated. The dynamic characteristics of steering circuit were analyzed. Results indicate that th...

The effects of loading rate on the reinforced concrete beams are experimentally studied in the present paper. Firstly, the effects of strain rate on the different grades of concrete are investigated using the electro-hydraulic servo-controlled testing system at the strain rate that might be experienced during earthquakes. Based on the test results, the dynamic increasing factors (DIF) of concre...

Aiming at the problem of coexistence matching and mismatching uncertainties in electro-hydraulic servo systems, disturbance observers a backstepping sliding mode controller based on generalized super-twisting algorithm (GSTA) are proposed this paper. First, order to compensate for uncertainty controller, two (GSTDOs) constructed effectively reduce discontinuous gain controller. Then, GSTA is in...

the depth control systems used in iranian tractors are mechanical and they produce variable tillage depth in uneven field surface. in this research a rotary type electronic control valve was designed and constructed. by using this valve, electro-hydraulic tillage depth control system was developed and installed on the tractor. the control system was composed of: a depth sensor, a programmable l...

In this study, the control performance of a hydraulic servo system with a feedback linearization compensator is investigated. The focus of this study is set on the quantitative investigation of the effects(sensitivities) of disturbances and system parameters’ variation on control performances of the hydraulic control system. Finally, verifies the efficacy of a disturbance observer to overcome t...

In this paper, we present a method to identify paramaters for controlling electro-hydraulic servo systems in real-time environment. With the aim of addressing problem that it is difficult accurately obtain state space equation parameters physical entity system, introduce an online identification theory (recursive least squares method) identifying said model valve-controlled symmetrical cylinder...