The purpose of this work to estimate oil temperature of hydraulic circuit that leads to affect the efficiency of the system. An expert system is built depending on the available knowledge. This model is generated in a computer program named “Thermal Analysis of Hydraulic System (TAHS)”. The program is used to calculate partial power losses at different components of hydraulic system (pump, motor, valves, cylinder, pipe and fittings). The expert system is capable to estimate oil temperature and power loss with different types of (pumps, oils, circuits and actuator dimension). The chosen experimental conditions are oil flow rate, setting pressure, ambient temperature and duty time. The model is validated experimentally and with other works. The results show an acceptable agreement with average deviation about 2.6% & 6.4% respectively.
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