Abstract
The aim of this paper is to analyze the driving system actuated by a proportional directional control valve on a hydraulic cylinder. In order to evaluate the dynamic interaction between the proportional valve and the cylinder theoretical analysis, numerical simulations as well as experimental test are performed. Coupling cylinder and proportional valve, it is very important to know the ratio of their natural frequencies. In particular, if the valve is characterized by a lower natural frequency, its behavior prevails so that no resonance peak can be observed on the coupled system. On the contrary, resonance phenomena can be observed in all the other cases. It is important that these phenomena are preventively taken into account to realize a precise and accurate control system of a hydraulic axle.At last, three different control methods are tested on the coupled system:Proportional Integral Derivative technique (PID), the adaptive One-Step-Ahead control technique, and an expert control technique and the obtained precisions are very interesting.
Highlights
The hydraulic axes practice has become very wide-spread in many applications
The Authors focus the attention to evaluate the dynamic interaction between a proportional valve and a synchronous cylinder and the consequent control system performed by a closed loop control on hydraulic system characterized by a differential cylinder controlled by a proportional directional control valve
This paper analysed the driving system actuated by a proportional directional control valve on an hydraulic cylinder
Summary
The hydraulic axes practice has become very wide-spread in many applications. Usually hydraulic axes are more flexible than classical axes with ball-screw electrically-controlled, and they can produce strong accelerations. The main difficulty is the physical system control, just because the hydraulic systems are very not linear. A high dynamics of proportional valve means a high quality control for a closed loop system hydraulically driven, but this opinion can be deceptive. To the authors’ knowledge, there are not many studies dealing with analysis of the dynamic interaction between a proportional valve and a linear actuator.The importance to analyse the whole system (the proportional valve and controlled hydraulic cylinder) is underlined in this paper. The Authors focus the attention to evaluate the dynamic interaction between a proportional valve and a synchronous cylinder and the consequent control system performed by a closed loop control on hydraulic system characterized by a differential cylinder controlled by a proportional directional control valve
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