Sliding mode control with varying boundary layers for an electro-hydraulic position servo system

Abstract

In this study, a new sliding mode control with varying boundary layers is proposed to improve the tracking performance of a nonlinear electro-hydraulic position servo system, which can be found in many manufacturing devices. The key feature of the proposed control scheme is the use of varying boundary layers instead of fixed boundary layers, which are usually employed in conventional sliding mode control. The validity of the proposed control scheme is verified through practical testing on an experimental electro-hydraulic positioning device. In the cases of step and sinusoidal command inputs, the experimental results strongly suggest that the proposed control scheme is capable of improving the tracking precision without causing any chattering. In addition, the new control scheme seems to be very robust against various set point conditions.

Nghiên cứu ứng dụng luật điều khiển thích nghi mờ trượt trong hệ bám sát vị trí điện thủy lực

“…Trong thực tế, việc thiết kế các bộ điều khiển cho hệ thống như vậy rất khó khăn đối với các phương pháp điều khiển thông thường. Ngày nay, các công trình nghiên cứu về các phương pháp điều khiển dựa trên lý thuyết điều khiển hiện đại ngày càng nhiều, với mục tiêu nâng cao chất lượng hoạt động trong các điều kiện thiếu thông tin đo lường, tác động của nhiễu loạn…, cụ thể như: bộ điều khiển thích nghi, bộ điều khiển trượt, phương pháp backstepping tích hợp; trượt mờ thích nghi, ... [1,2,3,4,6,7].…”

A Novel Compound Control Method for Hydraulically Driven Shearer Drum Lifting

“…In [22], an iterative learning control (ILC) method was applied to tracking the displacement curve of the hydraulic press slider and a fuzzy ILC algorithm utilized the fuzzy strategy to adaptively adjust the iterative learning gains. In [23], a new sliding mode control with varying boundary layers was proposed to improve the tracking performance of a nonlinear electrohydraulic position servosystem. Reference [24] presented the development of a proportional-integralderivative-(PID-) based control method for application to active vehicle suspension systems (AVSS).…”

Adaptive Robust Dynamic Surface Control of Electro-hydraulic System with Unknown Nonlinear Disturbance

“…However, affected by dead zone and volume flow nonlinearity of the control valve, internal leakage and volume flow unbalance of the asymmetric cylinder, and so on, the dynamic behaviour of the VCCS is highly nonlinear [5]. Due to the friction of the hydraulic components, the physical characteristics of the hydraulic oil vary with the working environment, many parameters in the VCCS are uncertain [6,7].…”