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An Original System for Controlling the Speed of Movement of Pneumatic Drives in Rehabilitation Devices

Żyłka Marta, Żyłka Wojciech, Szczerba Zygmunt, Biskup Marcin

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 1

124--132

The aim of the article is to present an original method of speed control and simultaneous stroke of the piston rods of two pneumatic cylinders using potentiometric position transducers, pneumatic solenoid valves, properly scaled throttle-check valves, solenoid valves and a microcontroller with power modules for solenoid valves. Initial experimental studies of the control system for simultaneous displacement of two piston rods of pneumatic actuators were carried out. The purpose of the research was to obtain the characteristics of the displacement of the extension of two pneumatic drives. The obtained results were analyzed. The results of the measurements confirmed the possibility of applying the presented control to rehabilitation devices for passive exercises of the lower extremities. The advantage of the proposed control system is its reaction speed, which is a response to changes in operating conditions of a given actuator, such as: external disturbances, own resistance of the controlled device, frictional resistance or movement caused by the patient exercising on the rehabilitation device moved by these actuators.

Experimental Research on the Velocity of Two Pneumatic Drives with an Element for Concurrent Motion

Żyłka Marta, Szczerba Zygmunt, Szczerba Kamil

Advances in Science and Technology. Research Journal

2022

Vol. 16, no 2

81--88

Experimental studies of a pneumatic drive system were carried out with the ap-plied element for the concurrent movement of two pneumatic drives. The main aim of these experiments was to obtain the results of specific measurements of displacements of two piston rods of pneumatic drives in relation to different values of loads in the whole range of the travel length. On the basis of these results, the speed of piston rods of two drives was determined. The results achieved during the experiment, showed the possibility of simultaneous insertion of two pneumatic drives with the use of an ele-ment for concurrent motion. This article is a continuation of the first article which was the study of the stroke speed of pneumatic cylinders with a synchronizing element.