Abstract
This article studies the cavitation performance and preventing method of the hydromechanical pressure compensation independent metering system (HPCIMS). Compared with the conventional load sensing system (CLSS), the meter-in and meter-out orifices of HPCIMS can be regulated independently. A quasi-static behavior analysis of cavitation performance was applied to the HPCIMS and CLSS. The meter-in pressure equation of HPCIMS showed that keeping the ratio of the meter-in and meter-out orifices greater than the minimum value can avoid the cavitation phenomenon. Systems parameters were then kept as constant, and the key parameters related to cavitation performance of the two systems were compared by varying external force. Comparison results show that the cavitation phenomenon in the meter-in chamber of CLSS with the external active load is inevitable, but in HPCIMS, it can prevent the cavitation phenomenon by changing the ratio of the meter-in and meter-out orifices, so the HPCIMS has the cavitation prevention potential.
Highlights
Due to the unique and valuable characteristics, hydraulic systems are widely used for a variety of applications ranging from construction to industrial, military, aerospace, and earth moving applications [1,2]
This study focuses on the quasi-static behavior of the hydromechanical pressure compensation independent metering system with external active load and ignores the dynamic effects
In the theHPCIMS, hydromechanical pressure compensation independent metering system (HPCIMS),there thereare aretwo two control valves that independently control the inIn control valves that cancan independently control the inflow flowand rateoutflow and outflow rate the cylinder chambers, soratio the ratio μ, which the ratio of rate rate of theofcylinder chambers, so the μ, which is theisratio of the the meter-in opening xin and the meter-out opening is changed, it can meter-in opening ratioratio xin and the meter-out opening ratioratio xout xisoutchanged, andand it can be be calculated by the Equation or (23)
Summary
Due to the unique and valuable characteristics, hydraulic systems are widely used for a variety of applications ranging from construction to industrial, military, aerospace, and earth moving applications [1,2]. The proportional directional spool valves are widely used in the mobile hydraulic system to control the flow direction and flow rate of the actuator [4]. The conventional load sensing system is a typical mobile hydraulic system, which is widely used in construction machinery and agricultural machinery. The proportional directional spool valve is used in the conventional load sensing system, which makes the system easy to control, but it brings in some significant limitations, such as energy losses and nonlinearities, which make the control system more challenging [5]. In the conventional mobile load sensing system, about 30% of the energy losses are due to the friction and hysteresis of the proportional directional spool valves [6]
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