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 20 of 33 for “"Hydraulic System"”.
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Modeling an internal hydraulic system which controls ball motions within a bounded fluid.
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Characterization of the basal hydraulic system of a surge-type glacier : Trapridge Glacier, 1989-92
… describe an investigation of the water drainage system beneath Trapridge Glacier, a surge-type glacier in Yukon Territory, Canada. We take two different approaches to characterizing the basal hydraulic system of the glacier. The first approach is borehole response testing, which involves changing …
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The Application of Computer Modelling to the Design Optimisation of a Microexcavator Digging
… for the design of microexcavator digging arm and hydraulic system has been undertaken.<br/><br/>Fundamental mechanics and structural theories have been used to develop a structural model of the Powerfab 360WT microexcavator digging arm under static or Quasi-Static loading …
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Programmable electrohydraulic valve
… the need for external feedback devices in the hydraulic system: a ""smart"" valve. Hardware limitations in the prototype prevented successful demonstration of this idea. Data acquisition hardware and software incompatibilities caused a loss of response speed in the control system, and flow …
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Design of an MRI compatible robot for wrist rehabilitation
… room, which is used to drive an MRI compatible hydraulic system. A novel, low friction, MRI compatible hydraulic vane motor was designed for use in the hydraulic system. The robot was designed for use with two interchangeable transmission alternatives: differential gears or friction drive. A …
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Mancais hidrostáticos aplicados em tornos de fabricação nacional
… for the design of plane hydrostatic bearing system, as used in machine tools, particularly lathes. Incompressible fluid flow conditions and parameters are first studied and defined for the bearing system. A digital computer program is then presented, which is capable of determining bearing …
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Nipping the bud hypothesis : a comparison of savannah and forest tree responses to canopy scorch
… in the vulnerability to disruption of the hydraulic system by heat scorch. I simulated canopy scorch using nine congeneric savanna-forest pairs in three Reserves in KwaZulu Natal, South Africa. Contrary to predictions, there was no difference in the presence of a viable bud bank between …
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Numerical and Experimental Study of Volumetric Particle Tracking Velocimetry in a Spatial and Temporal Domain
A hydraulic system was setup to generate a laminar flow in a cylinder tube. The flow is measured by the VPTV system for the purpose of demonstration. Fluorescent particles were employed to trace the fluid motion. An argon-iron laser was employed as the illumination system. The tube is immersed in a …
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Development and Analysis of the Lumped Parameter Model of a Piezo-Hydraulic Actuator
… actuation is an expanding field in which several systems, such as a mechanical, electrical, hydraulic, pneumatic, and/or thermal, among others, are integrated in order to combine certain aspects of each system, and achieve a better and more efficient performance under certain operating conditions. …
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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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Analysis of hydraulic power transduction in regenerative rotary shock absorbers as function of working fluid kinematic viscosity
… to the effective power transduction seen by a hydraulic motor. Applications of this research specifically relate to energy recovery from a vehicle suspension system through the shock absorbers. A regenerative, hydraulic-based, rotary shock absorber was designed and fabricated for the purposes …
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Mechanical development of an actuation system for a parabolic solar trough collector
… 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 …
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Feasibility assessment and design of micro hydraulic solid-state transducers
… of improved solid-state transduction, Micro Hydraulic Solid-State Transducers (MHSTs), is introduced and explored in this thesis. The concept is comprised of two core principles: ( 1) utilization of a hydraulic system consisting of a pump, valves, and a working fluid to rectify the high …
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Design, modeling, fabrication and testing of a piezoelectric microvalve for high pressure, high frequency hydraulic applications
A piezoelectrically-driven hydraulic amplification microvalve for use in high specific power hydraulic pumping applications was designed, fabricated, and experimentally characterized. High frequency, high force actuation capabilities were enabled through the incorporation of one or more bulk …
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High-pressure compliant syntactic foam for hydraulic noise control
Pressure fluctuations within a hydraulic system, commonly known as noise, create problems, such as leaks and breakout noise, within the system and necessitate treatment. Prior work has demonstrated the effectiveness of a flow-through expansion chamber with a syntactic foam liner; the device is …
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Modeling the Arterial System to Improve Ultrasound Measurements of Hemodynamic Parameters
… here is to use a flow phantom: a physical, hydraulic system that mimics arterial blood flow. The phantom provides pressure waveforms, which come directly from a catheterized tube, and volumetric flow waveforms, from an ultrasonic flow meter, that closely match the morphology of patient data. …
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Influence of penetration force in clay soils due to speed rate effect
… In order to install the pile through hydraulic system, it is crucial to understand the required penetration force needed to do the job. Generally, the penetration force and speed will be different for different soil conditions. Proper understanding of this scenario may facilitate the …
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Compression Failure of Aluminum Plates Exposed to Constant Heat Flux
… consisting of a compression load frame, a hydraulic system, and electric heaters. The effect of dimensional variation on failure behavior was examined. Aluminum 5083 and 6082 alloys were tested with three thicknesses, two lengths and two widths. Three heat fluxes and various buckling …
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Modeling and Experimental Validation of Disc and Reed Style Check Valves for Hydraulic Applications
… accurate, and practical mathematical model of a hydraulic reed style check valve. While the modeling of disc style check valves is well represented in literature, reed valve modeling research has focused on applications in air compressors and internal combustion engines, where the working fluid …
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Pilot Variability During Pilot-Induced Oscillation
… can lead to instability in an otherwise stable system. Previous and ongoing research has attempted to explain, predict, and avoid such oscillations. In contrast to other research, this effort backs away from pilot models and PIO avoidance and focuses on the characteristics of the pilot before, …
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