This paper presents the application of recurrence plots (RPs) and recurrence quantification analysis (RQA) in model-based diagnostics of nonlinear systems. A detailed nonlinear mathematical model of a servo electro-hydraulic system has been used to demonstrate the procedure. Two faults have been considered associated with the servo valve including the increased friction between spool and sleeve...

In this paper, a fault management system for a hydraulic servo axis is described. This system is capable of sustaining faults in the piston displacement sensor of the position-controlled hydraulic servo axis. By means of a parity equation based fault detection stage, faults in the displacement sensor as well as other sensors and components of the servo axis can be detected and subsequently be d...

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...

The intriguing history of disturbance cancellation control is reviewed in this thesis first, which demonstrates that this unique control concept is both reasonable and practical. One novel form of disturbance cancellation, ADRC (Active Disturbance Rejection Control), attracts much attention because of its good disturbance rejection ability and simplicity in implementation. Hydraulic systems ten...

The authors detail two servo-control strategies which improve the performance of servodriven electro-hydraulic robotic manipulators. The first servo-controller is pragmatic approach based on both empirical controller design and fuzzy logic and results presented demonstrate that its performance clearly surpasses that of the conventional P-controller. The second servo-controller is a robust state...

This paper presents a perfect tracking control for discrete-time nonminimum phase of electro-hydraulic servo (EHS) system by adopting a combination of feedback and feedforward controller. A linear-quadratic-regulator (LQR) is firstly design as a feedback controller and a feedforward controller is then proposed to eliminate the phase error emerge by the LQR controller during the tracking control...