A piston-rings-cylinder (PRC) assembly determines the blowby, engine oil consumption, and friction wear processes accompanying system's operation. Thus, it is crucial for whole IC efficiency lifetime. lot of research effort put into increasing performance this complex highly dynamic system. Advanced, comprehensive models play an important role in understanding improving PRC In presented work, e...

Existing theories describe corrosive wear in crosshead diesel engines in terms of acid condensation, when the temperature in the combustion space drops below the dew point. Here a theory is proposed which stresses the role of alkaline cylinder lubricants in protecting the metal surface. Calculated liner wear rates as a function of fuel sulphur content, feed rate and alkalinity of the oil, and a...

Sliding mode control with a fuzzy boundary layer is presented to hydraulic position control problem in this paper. A nonlinear hydraulic servomechanism which has an asymmetric cylinder is modeled and simulated first, then the proposed control scheme is applied to this model versus the conventional sliding mode control. Simulation results proved that the chattering free position control is achie...

This paper gives an introduction to a general hybrid systems model for definition of system requirements and a corresponding software architecture together with an example of their specialization for use in implementing a modeswitching controller for a hydraulic cylinder.

The emissions control regulations introduced by governments are set to improve engine quality and reduce the impact automobiles have on planet. imposed manufactures proven very difficult meet. To this effect some of leading names in industry were pushed invest significant funding research, development optimisation combustion, powertrain tribology inside ICE. Their goal is reduction fuel consump...

Abstract Piston rings cause significant friction losses within internal combustion engines. Especially the first compression ring, which is pressed onto liner by high cylinder pressure, contributes significantly to total loss of piston assembly. The tribological behavior oil scraper ring mainly related pretensioning force and can lead even at low idle speed. Due this, there always a markable ri...

This paper examines the effect of friction model on the simulation accuracy of a hydraulic cylinder by using three friction models: a steady-state friction model, the LuGre model, and the new modified LuGre model. Hydraulic cylinder’s behaviors were measured under sinusoidal input to the servo valve. Simulations were conducted under the same conditions as the experiments. The comparisons of sim...

STATEMENT OF PROBLEM Various surface treatments of zirconia have been recommended for veneering ceramics. However, it has not been determined which of these treatments produces the highest bond strength. PURPOSE This study examined the effects of various surface treatments on the shear bond strength of zirconia and veneering ceramic. MATERIAL AND METHODS Square-shaped (5 × 10 × 10 mm) zirco...