Study of Frequency Response of Control Components in a Pneumatic System

Abstract

The study explores the frequency response characteristics of the control components in a pneumatic system, while developing a set of the most effective measurement methods and equipment that provides the closest dynamic characteristics of the pneumatic system. First, the study inputs square pressure wave signals, which have various frequencies and are generated by directional control valves, into the pneumatic system, which is comprised of an electromagnetic valve, pneumatic pipes, and pressure sensors. In addition, the study discusses the influences of the aforementioned electromagnetic valve, pneumatic pipes, and pressure sensors on the frequency responses of the pneumatic system through the analyses of outputted pressure signals. Next, the study replaces the electromagnetic valve with the square pressure wave generator developed in the study that emits pressure square waves with frequencies up to 500 Hz to be inputted into premeasured pressure sensors in the pneumatic system for testing the dynamic characteristics of the pressure sensors at high frequencies. The study proposes applying square pressure waves to the dynamic property analyses of pneumatic components, i.e., inputs square pressure waves into premeasured pressure sensors through the excitement method to the pressure sensor and utilizes spectrum analysis for analyzing the outputted voltage signals. The experimental results can be provided for designers of pneumatic systems as references for selecting components and rectifying the system properties.