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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 24 for “"Dynamic friction"”.
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Dynamic friction: measurement and results
Friction has been known as a phenomenon since Leonardo da Vinci era. From that time and through the last four centuries, scientists tried to understand this phenomenon in an effort to overcome its undesired side effects which include energy loss, parts wearing, and errors in control systems. Much …
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Modeling and control of antilock braking systems utilizing dynamic friction tire model
… special emphasis on the modeling of tire and dynamic tire-road interaction is utilized to develop and test the proposed controllers. The novelty of the present research is in the utilization and formulation of a new dynamic friction tire model for the development and testing of designed …
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Dynamic Friction Characterization of Tripod Constant Velocity (Cv) Joints: Experiments, Analysis and Modeling
… thesis is to develop a physics-based internal friction model of tripod CV joints that can be readily applied during new vehicle development. This model will replace current practices of using empirical fixed friction coefficient values. In order to achieve this goal, a prototype …
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Fundamental Modeling and Experimental Investigation of Dynamic Friction at the Meso and Micro Scales
In this work, a basic dynamic friction model without any empirical parameters has been developed and used to predict and explain important dynamic friction phenomena. The validation of the proposed dynamic friction model has also been confirmed via experimental measurements. Moreover, adhesion …
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Experimental modelling of surface roughness and dynamic friction coefficient of diamond like carbon coated shafts
… with DLC often have strict surface roughness and friction coefficient goals. This research investigates the surface roughness and friction coefficient properties of uncoated and DLC coated specimens in an effort to satisfy two particular requirements of the industry. The first requirement is to …
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Investigation of frictional resistance on orthodontic brackets when subjected to variable moments
Friction and binding occur in orthodontics during sliding mechanics. This paper evaluated the influence of a variable moment, simulating mastication, placed at the bracket-archwire interface to determine its effects on friction. Friction of self-ligating brackets were also compared to stainless …
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Transfer lubrication techniques in a stick slip situation.
… based upon upper and lower bound linearised dynamic friction models. Corresponding theoretical stability relationships have been developed for transfer lubricated conditions and experimental comparison also made. In additiondetailed circumstances whereby stick slip motion is successfully …
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Nanomanipulation modeling and simulation
… subsystems that consistently define the dynamics of the nanomanipulator tip and nanosphere, friction between the nanosphere and the stage, and the contact deformation between the nanomanipulator tip and the nanosphere. The main feature of the proposed nanomanipulation model is the …
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Integrated Experimental Methods and Machine Learning for Tire Wear Prediction
… accurate and diverse wear data is necessary. The Dynamic Friction Tester (DFT) was designed and built for this purpose. This test machine has made it possible to collect accurate rubber sample wear data which has been validated under different conditions. Wear tests under diverse test conditions …
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Investigation of Acceleration Dependent Nonlinear Lubricated Friction in Hydraulic Actuation Systems
Lubricated friction issues are central to all hydraulic actuation systems undergoing motion and any in-depth understanding of the nature of lubricated friction will advance future component design. The classic friction models of hydraulic actuation systems under steady state conditions and their …
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Micro and nano composites composed of a polymer matrix and a metal disperse phase.
… the composites were also determined. Static and dynamic friction was measured. The scratch resistance of the specimens was determined. A study of the wear mechanisms in the samples was performed. The Al micro- and nanoparticles as well as Ni microparticles are well dispersed throughout the …
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Analytical Modeling for Sliding Friction of Rubber-Road Contact
Rubber friction is an important aspect to tire engineers, material developers and pavement engineers because of its importance in the estimation of forces generated at the contact, which further helps in optimizing tire and vehicle performances, and to estimate tire wear. It mainly depends on the …
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Return to Traffic of Full Depth Reclamation Pavements
… modeled for field use: British Pendulum Tester, Dynamic Friction Tester, a field-scale cohesiometer, and a rebound tester. The in-house testers were put through numerous tests on asphalt emulsion and asphalt foam samples. It was decided that of all of the testers, the one that showed the most …
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Establishing Boundary Conditions for Optimized Reconstruction of Head Impacts
… two main areas: 1) examining various aspects of friction during head impacts and 2) biomechanically characterizing the head impacts sustained by older adults during falls. This study provides insights into the overall influence of friction during head impacts. It investigates the friction …
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Road Surface Measurement and Multi-Scale Modeling of Rubber Road Contact and Adhesion
… is to understand the intricate mechanisms of friction. Pavement texture is a feature of the road surface that determines most tire-road interactions, and can be grouped into two classes: macro-texture, resulting mainly in the hysteretic component of friction, and micro-texture, resulting in …
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Fault monitoring in hydraulic systems using unscented Kalman filter
… are investigated in this thesis: loss of load, dynamic friction load, the internal leakage between the two hydraulic cylinder chambers, and the external leakage at either side of the actuator. Also, for each leakage scenario, three levels of leakage are investigated in the tests. The developed …
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Evaluation Of Pavement Surface Friction Seasonal Variations
Wet-pavement friction is one of the most important pavement characteristics in relation to highway safety. This property is difficult to measure because it is affected by many vehicle, driver, pavement, and environmental parameters. In particular, it has been observed that both short- and long-term …
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Tribological and Structural Characterisation of Ceramic on Metal Hip Replacements
… indication of the lubrication regime. Dynamic friction measurements were undertaken on the Durham Friction Simulator, using water based bovine serum based lubricants, which allowed the lubrication mechanism to be identified through the generation of a Stribeck Curve. The results showed …
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Development of Comprehensive Experimental, Analytical and, Numerical Methods for Predicting Rubber Friction and Wear under Thermomechanical Conditions
… of the tire and the vehicle in general. Friction and tread wear are two of these contact characteristics. Considering the tire's functionality, for most applications, it is desired to have higher friction to have better traction and a lower wear rate to minimize the material loss of the …
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Studying the Effects of Thermo-oxidative Aging on the Mechanical, Tribological and Chemical Properties of Styrene-butadiene Rubber
… properties of SBR were also studied. Dynamic Mechanical Analysis (DMA) was used to characterize the viscoelastic response. Master curves of storage and loss modulus were generated using the time-temperature superposition principle (TTSP). The friction coefficient was estimated from the …
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