Servo-hydraulic systems have been extensively employed in various industrial applications. However, these are characterized by their highly complex and nonlinear dynamics, which complicates the control design stage of such systems. In this paper, an extended wavelet functional link neural network (EWFLNN) is proposed to displacement response servo-hydraulic system. To optimize controller's para...

Leakages and valve faults are among the most common faults in hydraulic systems. This paper studies the real-time detection and isolation of certain leakage and valve faults based on the results obtained in part one. In the first part, the mathematical model of a hydraulic test bed was analyzed with Global Sensitivity Analysis to facilitate a systematic and verified approach to model-based cond...

his article deals with the identification of nonlinear models T in observer canonical form of hydraulic servo-drives from sampled data of input-output measurements. The data are processed by a modified Recursive Instrumental Variables algorithm, to provide input-output relationships of the plant dynamics. From the parameters of the input-output relations, continuous state-space nonlinear models...

Most of the existing active suspension studies assume that an ideal force actuator exists and will carry out the commanded force accurately. In reality, due to the interaction between the hydraulic actuator and suspension system, the lightly damped modes of the plant will generate lightly damped zeros (LDZ) for the servo-loop system, which confines the closed-loop performance to a low frequency...

This paper describes the design and experimental analysis of a Variable Structure Control (VSC) law using three reaching law strategies for a hydraulic servo control system. For this purpose we use a nonlinear mathematical model to develop a stable variable structure force control. The controller is designed using a sliding mode equivalence control and is augmented by reaching law approach to f...

Parallel manipulators have advantages such as high stiffness, low moving inertia, high payload capability, and high accuracy. In this paper, the servo drive system of valve controlled asymmetrical hydraulic cylinder is designed for 4SPS/S parallel manipulator with redundant actuator. A unified nonlinear model suitable for forward and inverse motion is deduced for the valve controlled asymmetric...

The electro-hydraulic servo pump control system (EHSPCS) is a high-performance unit that integrates permanent magnet synchronous motor (PMSM) and closed hydraulic (CHS). design features of high integration power-weight ratio lead to the poor heat dissipation capacity thermal balance temperature system. Excessive will seriously affect system’s performance service life. Therefore, analysis method...

The electro-hydraulic servo pump control system (EHSPCS) is a volume that uses permanent magnet synchronous motor (PMSM) with fixed displacement to directly drive and the hydraulic cylinder. energy transmission law of very complicated due transformation electrical, mechanical as well other fields, qualitative analysis transfer efficiency difficult. Energy EHSPCS under different working conditio...