Independent metering systems (IMSs) have been applied and researched in mobile machinery due to their advantages of reduced throttling energy losses remarkable advances under negative load through decoupling actuator control. Although IMSs the control flexibility deal with workloads, performance is challenged by uncertain loads operations, limiting accuracy. In addition, if motion reference imp...

The speed and torque of the hydraulic motor is controlled by controlling the hydraulic valve pump connected to the hydraulic motor. An electro hydraulic valve coupled to a hydraulic motor is a common method of motor speed control in practice where both load pressure and speed change during operation. In this paper, system equations that include, flow and toque loss term has been established by ...

In an electro-mechanical valve actuated engine, solenoid actuators drive the valves that control airflow into the cylinders, allowing elimination of the camshaft and flexible control of the valve timing. Individual control of the valves provides flexibility in valve timing over all engine operating conditions and fully enables the benefits of variable valve timing. This paper describes a closed...

The EHA (electro hydraulic actuator) has a notable advantage over conventional actuators as it uses closed-loop circuit, reducing the size and volume of oil, eliminates pressure losses caused by valve orifices. However, accurate control performance is difficult to achieve using traditional PID (proportional integral derivative) controller due strongly nonlinear, time-varying, unknown dynamics s...

Hands-on experiences constitute a high value, perhaps unreplaceable, element of applied engineering disciplines such as fluid power. Hydraulic and pneumatic trainers have been developed over the years to expose students applications power technology. However, traditional approach for educating through hands-on lab is recently under pressure due following aspects: a) outdated design that seldom ...

This thesis documents my personal contribution to the development of a hydraulic-based actuation system for a solar trough collector. The goal of this project was to design the actuation system using hydraulic actuators for a four meter solar collector prototype in Pittsfield, New Hampshire. After considering several hydraulic system architectures and conducting in-depth analysis into two of th...

Hydraulic systems are widely used in industry because of the advantages of their small size-to-power ratios and their ability to produce very large linear force and torque. There are tendencies for compact electro-hydraulic systems which deliver powerful, linear movement having hydraulic oil circulation only when operating. This paper investigates directly driven hydraulic setup for non-road mo...