Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"hydraulic circuits"”.
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Bond graph modeling of hydraulic circuits on a sweet sorghum harvester
… All the components on the harvester are powered hydraulically. Five pumps on the harvester supply flow to seven actuator circuits. Power is delivered to the pumps from the tractor PTO via a universal joint driveline. Each of the six existing circuits and one proposed circuit were modeled with …
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Implementation of Constrained Control Allocation Techniques Using an Aerodynamic Model of an F-15 Aircraft
… connected together by complex electrical and/or hydraulic circuits. Because of the large number of effectors, there can no longer be a one-to-one correspondence between surface deflections on the outside of the cockpit to pilot controls on the inside. In addition, these exterior control surfaces …
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High Speed Rotary PWM On/Off Valves for Digital Control of Hydraulic Pumps and Motors
… high efficiency control of fixed displacement hydraulic pumps and motors. On/off valves, the hydro-mechanical equivalent of transistors, enable the application of digital control techniques found in electrical systems to hydraulics. These techniques, such as pulse-width-modulation (PWM), have …
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Nonsmooth dynamic optimization of systems with varying structure
… occur frequently in the models of electric and hydraulic circuits, chemical processes, biological networks and machinery. As a result, the determination of parameters and controls resulting in the optimal performance of these systems has been an important research topic. Unlike dynamic …
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Energy Harvesting Hydraulically Interconnected Shock Absorber: Modeling, Simulation and Prototype Validation
… in the form of heat. Each shock absorber in a hydraulic interconnected suspension is connected by hydraulic circuits, allowing the electrified hydraulic fluid to be used to counteract undesirable body motion and enhance dynamic performance as a whole. An established idea with good potential for …
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Asymmetric Energy Harvesting and Hydraulically Interconnected Suspension: Modeling and Validations
… that can only dissipate energy by themselves. Hydraulic interconnected suspension uses hydraulic circuits to connect each shock absorber, so that the energized hydraulic fluid can be utilized to counter unwanted body motion to improve the overall dynamic performance. The hydraulic …
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Investigation of Novel Displacement-Controlled Hydraulic Architectures for Railway Construction and Maintenance Machines
… dissertation aims at showing how to transform hydraulic systems of railway multi-actuator machinery characterized by inefficient state-of-the-art systems into the 21st Century. Designing machines that are highly efficient, productive, reliable, and cost affordable represents the target of this …
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Achieving Efficient Control of Hydraulic Systems Using On/Off Valves
Hydraulic systems offer a range of benefits, such as high power density, ruggedness, linear actuation, and low cost, which have led to the use of hydraulic actuation systems throughout a wide range of industries. However, they also typically suffer from lower efficiency than competing methods of …
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Štípací stroj na dřevo
… pevnostních a kontrolních výpočtů a návrhu jeho hydraulického obvodu. Pro návrh konstrukce je nutné zvolit maximální rozměry dřevěné kulatiny, které mají délku 1,1 m a průměr i přes 0,5 m. Konstrukce stroje je vertikální. Další náplní práce je technická zpráva podobných strojních zařízení a …