الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
In hydraulic circuits, when openIng the directional control valve from neutral position to lifting position by a step input signal, a great surge
pressure is generally created.
The present work deals with the optimum directional control valve
spool velocity and relief valve cracking pressure to attain the minimum surge pressure during moving the directional control valve to lifting
position.
The transient response of the hydraulic circuit IS investigated
theoretically and verified experimentally. A special attention is paid to the transient behavior of the cylinder inlet chamber pressure.
The system behavior is theoretically evaluated by the development of a mathematical model for the system and computer simulation USing Simulink program (in Matlab 6.5). The developed simulation program is validated by comparing the theoretical and experimental results. The effect of different parameters on the system transient response IS predicted using the simulation program.
The system behavior is experimentally evaluated USIng a programmable
personal computer employing a special program (HPYEE LAB).
Theoretical results showed complete agreement with the experimental
fi n din g s .