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dc.contributor.supervisor Sepehri, Nariman ( Mechanical Engineering) en_US
dc.contributor.author Jalayeri, Ehsan
dc.date.accessioned 2016-03-02T19:26:13Z
dc.date.available 2016-03-02T19:26:13Z
dc.date.issued 2016
dc.identifier.uri http://hdl.handle.net/1993/31143
dc.description.abstract This thesis presents a novel, low cost, high precision , and efficient design for an electro-hydrostatic circuit for single rod hydraulic cylinders. The design is the main contribution of candidate to fulfill the regiments of PhD degree. The challenge of existing deigns of electro-hydrostatic circuits for single-rod cylinders is using one pump to control the cylinder under switching (resistive-assistive) loads. The proposed circuit utilizes off-the-shelf industrial elements. It uses two counterbalance valves to manage switching loads and one on/off solenoid valve to redirect the differential flow of the single rod cylinder to tank. A set of simulation studies is conducted using Simhydraulic tools of Matlab in order to study performances of the proposed circuit and compare it with existing designs. Pump-controlled hydraulic circuit for double rod cylinders was developed and is widely used by industry. It is used as the benchmark for simulation studies. As well, the proposed circuit and two major existing pump-controlled circuits for single rod cylinders are compared to the benchmark circuit. Evaluations are conducted by comparing chamber pressure responses as well as pressure vs position of the cylinder end-effector for each individual circuit. Results indicate that the proposed circuit performed as well as the benchmark circuit by controlling pressures to both sides of the cylinder at the same time. Moreover, the load in the proposed circuit is more controllable compared to the benchmark circuit. Experimental results, obtained from the developed test rig, validate accuracy of the simulation model. Maximum steady state position error of 0.06 mm applications is experimentally observed when the test rig is tested under different loading conditions with various amplitudes and frequencies. The circuit consumes up to 20% of the energy that is required by a valve controlled circuit given the same sinusoidal tracking signal. The relative efficiency of the proposed circuit over a valve xii controlled circuit depends on the pattern and frequency of the tracking signal. In all the experiments, a simple proportional controller, which uses readings of a linear position transducer, is employed. The use of the proportional controller makes the proposed circuit easy to implement and shows it is good candidate for industrial applications. The accuracy of the position response of the proposed circuit indicates, it is a good candidate for robotic applications too. en_US
dc.subject Design en_US
dc.subject pump-controlled hydraulic circuit en_US
dc.subject Gear pump en_US
dc.subject Piston pump en_US
dc.subject Counterbalance valve en_US
dc.subject Pilot check valve en_US
dc.subject Fixed displacement hydraulic pump en_US
dc.subject Variable speed en_US
dc.title Design and experimental evaluations of a pump-controlled hydraulic circuit en_US
dc.degree.discipline Mechanical Engineering en_US
dc.contributor.examiningcommittee Sepehri, Nariman ( Mechanical Engineering) Peng, Qingjin ( Mechanical Engineering) Filizadeh, Shaahin ( Electrical and Computer Engineering) Fotouhi, Reza ( University of Saskatchewan) en_US
dc.degree.level Doctor of Philosophy (Ph.D.) en_US
dc.description.note May 2016 en_US


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