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 15 of 15 for “"sliding surfaces"”.
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Temperature and friction of sliding surfaces.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1971.
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Tracking control of nonlinear systems using sliding surfaces
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1983.
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Characterization of Nano-Porous Si-Cu Composites to Enhance Lubricant Retention Impacting the Tribological Properties of Sliding Surfaces
… rise, the retention of lubricant on the contact surfaces of their sliding components becomes an increasingly important issue. Friction and wear cause heat-related failures which lead to catastrophic damage to machinery. Evaporation of a lubricant's volatile constituents as well as lubricant …
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Six degree of freedom vehicle controller design for the operation of an unmanned underwater vehicle in a shallow water environment
… these equations of motion, then a robust 6 DOF sliding controller employing six-element vector sliding surfaces provides a framework in which satisfactory UUV control can be achieved in shallow water. The vehicle equations of motion are developed and cast in a form that is amenable to non-linear …
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Estabilidade de taludes de solos residuais de granito e de gnaisse
… - wich ultimately govern the potential sliding surfaces. The basic point is the understanding of the weathering profile and the geological history of the slope. The subsurface hidrology is discussed in regard to the geotechnical and geological investigations. Design methods based on the …
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Design of a mechanical system for tillage tool depth control on small farm tractor
… self-locking rack and pinion jack, load-bearing sliding surfaces, and rack clamp that is used to secure the cultivator sweep. The design is evaluated for deformation and deflection at the maximum theoretical loads using Finite Element Analysis. The design successfully minimizes deflection, but …
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Hydromechanical Evaluation of Flow Behavior in Rock Foundations of Concrete Gravity Dams
… a constant cohesion intercept along potential sliding surfaces, regardless of the magnitude of the effective normal stresses, to explain satisfactory structural behavior observed in concrete dams. The results obtained in this study indicate that adequate dam behavior might actually be the …
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Tribopolymerization: ceramic lubrication under high loads and high speeds
… may reduce wear by providing protection to the sliding surfaces. Proposed wear mechanisms and a discussion of possible speed-wear interactions are presented with recommendations for continued tribological testing.
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Defining the role of elastic lubricants and micro textured surfaces in lubricated, sliding friction
Solutions for reducing friction in sliding, lubricated systems include modifying lubricant rheology using polymers and adding a micro-scale texture to the sliding surfaces, but the mechanism of how lubrication properties and surface texturing interact is poorly understood. This thesis presents a …
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On data-driven modelling and terminal sliding mode control of dynamic systems with applications
… namely data-driven identification, fast terminal sliding mode control alongside underactuated crane control, and robotic pointing system for thermoelastic stress analysis (TSA). The first part is devoted to system modelling. A dynamic model can be identified from data collected (input and output …
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Analysis and design of rapid prototyped mechanisms using hybrid flexural pivots
… flexural systems are preferred as they lack of sliding surfaces. Moreover, flexure hinges are able to produce accurate and repeatable motion when properly designed. Conventionally, flexure-type systems are manufactured from high performance metals such as stainless and alloyed steel or aluminum …
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A new approach to ceramic lubrication: tribopolymerization
… which polymerize at the contact region under the sliding action to form a protective layer at the contact. Selected monomers -- including one condensation type, C₃₆ dimer acid/ ethylene glycol monoester, and five addition type, i.e., lauryl methacrylate, diallyl phthalate, vinyloctadecyl ether, …
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Estimation of the Real Area of Contact in Sliding Systems Using Thermal Measurements
This thesis seeks two objectives. One objective is to develop a means to estimate time invariant real contact areas and surface temperatures through thermal measurements in 1D/2D systems. This allows computationally easier models, resulting in faster simulations within acceptable convergence. The …
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Sacrificial bearing components for quasi-isolated response of bridges subject to high-magnitude, low-probability seismic hazard
… elastomer and a stainless steel-on-Teflon sliding surface. The elastomeric bearings are further restrained in the transverse bridge direction with stiffened, L-shaped retainer brackets. Full-size bearing specimens were subjected to compression loads of up to 100 kips, cyclic displacements …
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Development of Electromagnetic Friction Dampers for Improving Seismic Performance of Civil Structures
… of input seismic energy through a smooth sliding in the damper. In the proposed PEMECFD, friction force is produced through magnetic repulsive action between two permanent magnets (PMs) magnetized in the direction normal to the friction surface, and the eddy current damping force is …