Design of direct drive electrohydraulic actuator with sensors technology

Fazli, Haziqah Izzati (2021) Design of direct drive electrohydraulic actuator with sensors technology. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Hydraulic actuator is one of the actuators that widely utilized due to its powerful advantages such as high force and has been implemented in heavy engineering applications. However, hydraulic systems suffer from parameters changes effect such as pressure drop, temperature effect on oil viscosity and inconsistent flow in pipeline. Due to lack of sensor monitoring for these parameters, optimum performance of the hydraulics cannot be achieved. Electro-hydraulic actuators are linear or quarter-turn actuators equipped with an integral hydraulic power system. The electro-hydraulic actuator operates on a pump-and-bleed principle wherein a motorized oil pump provides hydraulic pressure in one direction and the spring-return in the opposite (bleed) direction. The oil flow to the actuator is controlled by electric solenoid valves and can provide both open and close or modulating operation in response to a control signal. With any of these designs, the actuator can cause the valve to fail in the open, close or last (current) position, loss of electrical power because there are no device additional to sense if the system have some failure. In this project, the model of direct drive hydraulic system had been developed. Then, the close loop hydraulic model is integrated with the sensor monitoring system which including the dashboard. Finally, the performance of the parameters is presented in dashboard through graphical user interface or known as AppDesigner. The result shows that parameters such as pressure, position and flow rate are important to be monitored and considered in the controller design. The maximum value of pressure is 350 Bar, temperature is fluctuated about 50% during the operation and flow is saturated at 12L/min. In conclusion, the monitored parameters can be included in controller design and to achieve optimum performance

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