Abstract
This paper covers with experimental measurement and mathematical simulation of parallel capacitance influence on pressure response for non-stationary flow. The hydraulic circuit for measuring required quantities, which are necessary to determine of parallel capacitance influence on the hydraulic system dynamics. A part of hydraulic system is a long pipe, in which the parallel capacitance created by hydraulic hose is connected. A non-stationary flow is caused by fast closing of the seat valve, which is situated at the end of long pipe. Mathematical model is realized and verified in Matlab SimScape Fluids software for this hydraulic system.
Highlights
Rapid increase of pressure occurs during hydraulic shock, which causes unwanted effects such as vibrations, more severe straining of hydraulic parts and shorter lifespan of the whole system.One of the options used to partly eliminate quickly emerging pressure peaks during hydraulic shock is to suitably place a part, which possesses hydraulic capacitance into the system
Pressure response with respect to time during hydraulic shock is affected by hydraulic capacitance of connected hose, capacitance of pipeline and capacitance, which is created by fluid compressibility
It can be assumed that the parallelly connected hydraulic capacitance created by hydraulic hose could have positive influence on the pressure peak during hydraulic shock
Summary
Rapid increase of pressure occurs during hydraulic shock, which causes unwanted effects such as vibrations, more severe straining of hydraulic parts and shorter lifespan of the whole system. Connected parallel capacitance makes it possible to absorb a part of the pressure energy during hydraulic shock. Flexibility of the hose is influenced by the number of steel braids. A hose which has the same number of braids than another one but higher inner diameter has higher volume and is more flexible. Another element which influences hydraulic capacitance is the hydraulic fluid used. Pressure response with respect to time during hydraulic shock is affected by hydraulic capacitance of connected hose, capacitance of pipeline and capacitance, which is created by fluid compressibility. It can be assumed that the parallelly connected hydraulic capacitance created by hydraulic hose could have positive influence on the pressure peak during hydraulic shock. During supression of the pressure peak, a slight straining of all hydraulic parts, which are affected by the pressure wave caused by hydraulic shock, occurs
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