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 13 of 13 for “"camshaft"”.
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An experimental investigation of camshaft dynamics.
… the engine. Unwanted vibrations in the camshaft area can lead to accelerated wear of the valvetrain mechanism, causing the engine to lose power. To try and gain a better understanding of the vibration levels in the camshaft area it was decided to focus this research project on one …
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Stress and fatigue analysis of SVI-tested camshaft lobes
… were employed to fully characterize three 2.3L camshafts tested in an engine simulator for an equivalent of 100,000 miles. Optical microscopy, acoustic microscopy (SAM), and profilometry were used to characterize wear and fatigue, crack depth, and surface roughness, respectively. Results show …
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A rapid, non-destructive test to detect camshaft lobe grinding burn
… herein describes thesis research in an on-going camshaft grinding evaluation study, initially under the sole sponsorship of Ford Motor Company, and subsequently under the auspices of the National Science Foundation, with industrial participation from American Stress Technologies, Ford Motor …
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Tracking Control and Disturbance Rejection With Applications to Non -Circular Turning for Camshaft Machining
… to the Non-Circular Turning Process (NCTP) for camshaft machining. NCTP is a single-point turning process which produces non-circular shapes using rapid tool actuation. When applied to camshaft machining, NCTP enables the generation of a wide variety of cam profiles from round workpiece by using …
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The effect of multiple carburetors and a racing type camshaft on the performance of a spark ignition engine
The 3/4-race cam and dual carburetors tested in this investigation provided moderate increases in maximum power output at speeds above 3000 rpm, The fuel consumption was reduced by the use of the racing type cam and increased with the use of two standard carburetors. However in the latter case it …
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Design of an internal wave generator for experimental applications
… on top of each other, and using a rotating camshaft to drive them in a sinusoidal fashion. Measurements of the oscillation of each plate shows that the motion induced in each plates by the camshaft is very close to sinusoidal, and that the generator can successfully produce oscillations of …
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The effect of base stock and additive packages in an automotive oil on the friction and wear behaviour of overhead camshaft and finger follower systems
The introduction of overhead camshaft valve train systems some 25 years ago has resulted in improved engine performance and efficiency, this in turn however, has caused increased wear problems. In order to understand the tribological behaviour of overhead camshaft systems, test engines and …
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An electromechanical valve drive incorporating a nonlinear mechanical transformer
In traditional internal combustion engines, a camshaft acts on the valve stems to open and close the valves. Valve timing is fixed relative to piston position. On the other hand, if a valve is flexibly controlled by a variable valve actuation (VVA) system, we can achieve significant improvements in …
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Robust Repetitive Control and Its Application
… actuator for non-circular machining of camshaft to show their effectiveness. A dual stage actuator using an electrohydraulic actuator and a piezoelectric actuator is developed to further reduce cam profile tracking errors. The design, modeling, analysis and preliminary control design of …
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A multi-objective evolutionary approach to simulation-based optimisation of real-world problems.
… the second one concerns the optimisation of a camshaft machining line at Volvo Cars Engine. The results from the optimisations show that the algorithm finds better solutions for all the problems considered than existing, similar algorithms. The new techniques for dealing with surrogate …
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Performance simulation and control design for diesel engine NOx emission reduction technologies
… exhaust manifolds; rotational dynamic for engine camshaft and turbocharger shift, air-charging model and exhaust properties regressed by the data from integrated simulation at different engine operating conditions. The MVEM was implemented in Matlab/Simulink for verification. Modular and system …
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Residual stresses due to grinding
An analytic treatment of stresses and temperatures generated during grinding is presented from an elasticity approach. A two-dimensional heat conduction model employs an energy partition scheme in the grinding zone to produce realistic temperature profiles. By using the basic equations of …
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Vliv pružnosti rozvodového mechanismu na pohyb ventilu
Cílem této diplomové práce je porovnání pohybu ventilu jedné sestavy (SVT) a pohybů jednotlivých ventilů kompletní sestavy s pružným vačkovým hřídelem s ohledem na dynamické vlastnosti. Součástí práce je také kinematický návrh v programu VALKIN. Dynamická část je řešena v MBS programu Virtual …