Abstract
The main part of the hydraulic circuit of the hydraulic stabilization platform (HSP) is the electro-hydraulic servo valve (EHSV), which is very expensive due to its manufacturing requirements, so the proper selection for the geometrical configuration of electro hydraulic servo valve (EHSV) and maintaining the system stability are the main goal for establishing HSP. Also improving the performance of (HSP) to achieve the position tracking in two degrees of freedom (2DOF) based on modifying the different parameters of the hydraulic circuit (actuator size - hydraulic servo actuator geometric configuration - different load on the platform) to achieve the best performance. The system offers a proposal for an upper stabilized platform with moving lower base to be used with ships to achieve a stabilization condition for many purposes such as radar. MATLAB Simulink and Simscape-multibody has been used in modeling the system. Changing the different parameters in the program block library input data (orifice area and spool slot width) to achieve best configuration of the system to be stabilized is discussed. The results show that using 0.6 mm² servo valve orifice area and more raises the system pressure and has a bad effect on system stability, also using 4 mm servo valve slot width has more fluctuation in the system pressure in the transient time than using (3, 2 or 1)mm slot width until approaching stable condition but has a better effect on system stability in the running (operation) time.
Highlights
Stabilization platform (SP) has many applications in air, sea or ground
The result in fig. (9) shows that using orifice area (0.2 mm2) the fluctuation in the transient time tells that reaching the steady state is less than any further more area, the platforms inclined (1.1 degree) in positive direction, and the system fluctuated around (0 degree) with a magnitude (0.2 degree) and transient time (0.55 sec.)
Using 0.2 mm2 servo valve orifice area reduces the consumed pressure and there is less power consumption. It has a good effect on system stability on the transient time, while using (0.4, 0.6 or 0.8) mm2 servo valve nozzle area consumed more pressure and has a bad effect on system stability
Summary
Stabilization platform (SP) has many applications in air, sea or ground. Examples for air applications are airborne camera stabilization (gimbal camera) which is mounted in the planes and is used for high Precession photo, the Hubble Scope Telescope used for space observation and the aircraft simulator used to simulate the motion of flight for pilot training purpose. Some platform applications deal with the error between the target that required to approach and the actual position that the platform reach, other platforms deal with the transient time that the platform take to approach the steady state condition and other deal with the maximum overshoot that is reached by the platform. Most studies in this field deal with the control method used in the stabilization platform which is the input data to the (EHSV).
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