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 77 for “"low friction"”.
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Si-DLC coatings optimized for low wear and low friction applications.
… as high hardness, high wear resistance and a low friction coefficient. Nanolayer systems of hydrogenated diamond-like carbon (a-C:H) and silicon doped hydrogenated diamond-like carbon (Si-DLC or a-C:H:Si) have been studied. The objectives of this work are to develop layer combinations which …
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Development and characterisation of novel low-friction wear-resistant multiplayer nanocomposite CrAlTiCN coatings
… design, deposition and characterisation of novel low-friction, wear-resistant multilayer nanocomposite CrAlTiCN coatings. Systematic materials characterisation and property evaluation were conducted on the as-deposited and oxidation-tested CrAlTiCN coatings, and the results are presented and …
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Computational Study of Low-friction Quasicrystalline Coatings via Simulations of Thin Film Growth of Hydrocarbons and Rare Gases
… compounds (QC) have been shown to have lower friction compared to other structures of the same constituents. The abscence of structural interlocking when two QC surfaces slide against one another yields the low friction. To use QC as low-friction coatings in combustion engines where …
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The Influence of Occupational Footwear on Slip Responses
… where individuals walked over a sheet of high friction aluminum foil. On the sixth trial and without the participant’s knowledge, the aluminum foil was replaced with a low friction hard plastic surface to induce an unexpected slip. The remaining six trials were conducted over the low friction …
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Design of an air track for engineering and physics education
… force and motion in the classroom, providing a low-friction environment to observe phenomena. Unfortunately, currently available models have limited functionality and are prohibitively expensive for many schools. To improve access to this helpful device, a number of smaller and less expensive …
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Piston ring design for reduced friction in modern internal combustion engines
Piston ring friction losses account for approximately 20% of the total mechanical losses in modern internal combustion engines. A reduction in piston ring friction would therefore result in higher efficiency, lower fuel consumption and reduced emissions. The goal of this study was to develop …
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A carbon nanotube bearing and Stodola rotor
… strongly bonded and can slide on each other with low friction. While MWNT based rotors have been previously constructed, they have so far been limited to horizontally oriented nanotubes. The rotor uses a vertically aligned tube, which allows superior control of the rotor geometry, enabling …
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A novel magnetically levitated interior permanent magnet slice motor
… is advantageous in applications which require low friction, long operational lifetime, and high purity or cleanliness. In this thesis, we present the design, construction, and testing of a novel magnetically levitated interior permanent magnet slice motor. This design is targeted for use as a …
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Slip-Correction Methods for Improved Dead Reckoning in Autonomous Wheeled Robots
… square. Testing was conducted on high-friction rubber and low-friction artificial ice surfaces, with a motion-capture system providing ground-truth data for evaluation. Results were both assessed visually, and using RMSE of the motion-captured path against the desired path. A …
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Design of Polymer Composites With Improved Adhesion and Wear Properties
… a third body during sliding, the ATSP system had low friction and much lower wear compared to a commercial PTFE based coating. TOF-SIMS analysis showed that ZonylRTM particles had migrated down into the coating at least 1.5 microm deep when the wear track was only 0.2 microm deep, which means that …
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Tribological Behaviours Influenced by Surface Coatings and Morphology
… wear resistance, corrosion resistance and low friction coefficient. In this work, PEO process was used to produce a relatively thick (~20 μm) coating on A356 Al alloy for improving the wear resistance and tribological properties of the Al alloy. Effects of surface roughness and sliding …
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Experiments To Improve Behavior of Electrowetting Surfaces in Microhydraulic Actuators
… of MHA6 (MHA6A) couldn’t actuate due to high friction between the rotor and stator surface. This thesis investigated possible causes of high friction in MHA6 through quantitative friction drag experiments and contact angle experiments, and determined fabrication processes that led to low …
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Investigation of Plasma Electrolytic Oxidation (PEO) Coated Bores in Internal Combustion Engines
… improvement is through the reduction of frictional parasitic losses in tribological systems. This study investigates the feasibility of use for low-friction Plasma Electrolytic Oxidation (PEO) coatings on cylinder bores in order to reduce the frictional coefficients along the piston ring …
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Design of an MRI compatible robot for wrist rehabilitation
… 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 stand was designed to allow …
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Traction and Launch Control for a Rear-Wheel-Drive Parallel-Series Plug-In Hybrid Electric Vehicle
… vehicles come with a great increase in torque at lower RPM resulting in the issue of transferring this torque to the ground effectively. In this thesis, a method is presented for limiting wheel slip and targeting the ideal slip ratio for dry asphalt and low friction surfaces at every given time …
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Development of H∞ control strategy for a multi-wheeled combat vehicle
… standard events are used for testing. Two road friction coefficients are used, 0.35 and 0.85 µ at speeds between 40 and 100 kph. The proposed control system is able to greatly improve vehicle stability at high speeds and/or low friction and increase maneuverability at lower speeds and/or higher …
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Leidenfrost Drop Ratchet Impact Dynamics
… surface. This vapor layer is responsible for the low friction and long lifetime of the drop. Falling water droplets will even bounce on their own vapor layer. By varying the geometry of a surface at the micro-scale, it is possible to control the movement of impacting droplets in this Leidenfrost …
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HandSkates : an apparatus for physically intelligent exercise
… developed was the HandSkate, a handheld, low-friction device intended to train core and upper-body muscles by forcing the user to balance themselves and stabilize the HandSkates while performing simple, familiar exercises. Two concepts for the HandSkate were prototyped and tested. The …
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Friction and Wear Performance of Lifeboat Launch Slipways
… section where the boat is held on rollers followed by an inclined keelway of nickel/chromium coated steel, the lifeboat is released from the top of the slipway and proceeds under its own weight into the water. The lifeboat is subsequently recovered to the top of the slipway using a winch line. …
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Assessment of force coordination and neuromuscular quickness in healthy adults
… falling. We varied the parameters of surface friction (e.g. high and low friction) and LF direction (e.g. pulling up and pushing down) in order to evaluate variables that could potentially affect the measured outcomes. Overall, this study created a simple, non-invasive measurement technique …
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