The Undissolved Air Influences on Dynamic Behavior of Hydraulic Driving Systems

Abstract

This paper is a part of a group of papers which deal with the changes due to the oil - air mixture into the hydraulic actuating systems. The undissolved air into the hydraulic agent of technological equipment actuating system generates the negative effects on system behavior. The negative effects are produced by the cavitations phenomenon emergence, by the intense acoustical phenomenon due to the dynamic characteristics modification of the driving system (natural pulsation, damping factor, external exciting factors, period and frequency of pressure dynamic oscillation, etc). In this paper the authors propose expressions for practical computations of dynamic parameters as a function of rigidity characteristics changing for hydraulic agent contaminated with undissolved air, and of qualitative and quantitative influences analysis of undissolved air percentage from the total hydraulic agent into the system. The study becomes a strong argument for avoiding the dynamic phenomenon due to the air absorption in hydraulic systems. It is very useful for researchers and designing engineers on hydraulic actuated technological equipment domain.