Title :
Simulation research on the variable displacement hydraulic motor with variable effective piston stroke for hydraulic propulsion system
Author :
Li Lin ; Luo Gaosheng ; Gu Linyi ; Chen Jiawang
Author_Institution :
State Key Lab. of Fluid Power, Zhejiang Univ., Hangzhou, China
Abstract :
Variable displacement speed regulation is a good method for hydraulic propulsion system compared with throttle speed regulation and high speed on/off valve speed regulation, however the minimum variable displacement motor we can get is about 28cc/r, which is too large for a light or medium weight ROV. The variable effective piston stroke (VEPS) motor is a kind of virtual variable displacement (WD) motor which is suitable for hydraulic propulsion system. The VEPS motor have hydro-mechanically controlled poppet control valves on every cylinder of the piston motor, and have a completely symmetrical port plate instead of a kidney plate as in a conventional motor, creating a hydraulic motor capable of producing variable power. It is based on the conventional axial piston motor but with hydraulic operated poppet valves as distributor for each cylinder. All the poppet control valves are set to execute at the same setpoint(an angle position on the portplate), each cylinder works as a independent WD motor and drives the shaft with the other cylinder. The VEPS motor adjust its displacement by changing the duty ratio of the effective piston stroke. The VEPS motor can change its rotate direction, adjust its displacement just by changing the setpoint of the poppet control valves. A computer model of the VEPS motor based on AMEsim is built to check the novel variable piston motor, and the simulation results show that VEPS motor can achieve the functions mentioned above with proper parameters. The functional test of the prototype also shows that the VEPS pump-motor is feasible.
Keywords :
hydraulic motors; pistons; propulsion; pumps; valves; velocity control; VEPS pump-motor; WD motor; computer model; high speed on/off valve speed regulation; hydraulic propulsion system; hydro-mechanically controlled poppet control valves; kidney plate; minimum variable displacement motor; poppet control valves; simulation research; symmetrical port plate; throttle speed regulation; variable displacement hydraulic motor; variable displacement speed regulation; variable effective piston stroke; Educational institutions; Fluids; Force; Pistons; Propulsion; Springs; Valves; axial piston motor; high speed on-off poppet valve; hydraulic; variable effective piston stroke; virtually variable displacement;
Conference_Titel :
Oceans, 2012
Conference_Location :
Hampton Roads, VA
Print_ISBN :
978-1-4673-0829-8
DOI :
10.1109/OCEANS.2012.6405133