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 18 of 18 for “"hydraulic fluid"”.
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Multi-path planning for hydraulic fluid routing
… applied. I applied this algorithm to 3D printed hydraulically actuated robots, though it has additional applications in circuit routing for PCB assembly, FPGA interconnect optimization, fiber optic routing, and other routing applications. The performance of the algorithm is discussed, profiled, …
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Characterization and analysis of an MRI compatible robot design for wrist psychophysics and rehabilitation
… a non-ferrous, MRI compatible, low impedance hydraulic fluid transmission, consisting of two pairs of custom designed and fabricated vane motors. This thesis details the characterization and redesign of this robot, with emphasis placed upon the hydraulic system.
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Piezohydraulic Actuator Design and Modeling Using a Lumped-Parameter Approach
The concept of piezohydraulic actuation is to transfer the reciprocal small stroke displacement of piezoceramics into unidirectional motion by frequency rectification through a hydraulic fluid. It takes advantage of the high force capabilities that piezoelectric materials have and couples it with …
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An assessment of polymeric materials and surface treated steels as cavitation erosion resistant materials
… choice of materials used for vital components of hydraulic machinery. Frequently these components are damaged by a process known as cavitation erosion and the operation and efficiency of machines are seriously impaired. Nineteen different polymers which have potential for use in hydraulic …
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Nonlinear dynamic model and simulation of a high pressure monotube shock absorber using the bond graph method
… to identify the interaction between mechanical, fluid, and thermodynamic elements. Various phenomena are modelled such as fluid inertia effects, laminar orifice flow, air entrained in the hydraulic fluid, and cavitation. Simulation results demonstrate good model accuracy when compared t.o test …
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Performance Modeling and Efficiency Analysis for a Piezohydraulic Pump with Active Valves
… design for most commercial applications. Piezohydraulic actuation provides an ideal amplification that can achieve any combination of stroke and force, which is superior than most other amplification technologies. The concept of piezohydraulic actuation takes advantage of the high force …
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Towards the Synthesis of Novel Linseed Oil Based Anhydride Compounds
… wide range of products varying from cosmetics to hydraulic fluid. The second part of the introduction describes the cellulose fibres and its vast potential usefulness due to its abundance. Furthermore, its current uses are explored, with uses in the Pharmaceutical industry among other things. The …
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Structure Segmentation and Transfer Faults in the Marcellus Shale, Clearfield County, Pennsylvania: Implications for Gas Recovery Efficiency and Risk Assessment Using 3D Seismic Attribute Analysis
… an attempt to intersect fractures for effective hydraulic stimulation. If the fractures are contained within the shale, then hydraulic fracturing can enhance permeability by further breaking the already weakened rock. However, natural fractures can affect hydraulic stimulations by absorbing …
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Triply Periodic Minimal Surface Lattices for Mechanically Tuning Structures and Designing Multifunctional Devices
… into electrical energy and (2) acting as the hydraulic fluid for damping. Lastly, I present my work on two approaches to fabricate patient specific coronary artery models. The first approach is synthesizing new hydrogel materials for 3D printing that will enable us to print materials soft …
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An energy and environmental analysis of aerospace sheet metal part manufacturing
… use due to heat losses in SPF and circulation of hydraulic fluid in stretch and flexforming, meaning that cycle time is a critical factor in electricity use. Lastly, we find that the material for the blank, the die, and the electricity can each dominate impacts depending on the particular …
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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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Identification of Factors Associated with Fume Events Using Text Mining and Data Mining Methods
… and flight deck is contaminated with pyrolyzed hydraulic fluid or oil from turbine jet engines. These fume events occur sporadically and can result in acute or chronic exposure in air crews and can have catastrophic consequences if flight crew members become impaired or incapacitated. The …
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Semi-active damping of heavy vehicles.
… input conditions and the compliance of the hydraulic fluid is found to have a strong influence upon the response of the damper. The different vehicle and road models used in the thesis are described in chapter 3. In chapter 4, the performance of the prototype damper is investigated under …
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Durability of Polyimide Adhesives and Their Bonded Joints for High Temperature Applications
… towards organic solvents and other aircraft fluids such as jet fuel and hydraulic fluid. The results from the FM-5 adhesive and its bonded joints were compared and contrasted with VT Ultem and REGULUS polyimide adhesives. The FM-5 adhesive showed the best performance among the three adhesive …
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Pressurized Metal Bellows Shock Absorber for Space Applications.
… Most terrestrial shock absorbers use hydraulic fluid, allowing for compact and inexpensive devices. Hydraulics have been used in space applications, but require thermal controls to maintain the proper fluid viscosity. They also require dynamic seals which, in the case of a leak, can …
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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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Life Cycle Assessment der alterungsbedingten Umweltverträglichkeit biogener Hydraulik-Schmierstoffe
Biogenic hydraulic fluids, based on synthetic esters (categorie: HEES), have an excellent environmental profile in the unused state, so that they are typically classified into water hazard class 1 or as "not hazardous to water". During storage at room temperature and tribological application, …