the paper investigates into the vibrational characteristics of the truck chassis including the natural frequencies and mode shapes. truck chassis forms the structural backbone of a commercial vehicle. when the truck travels along the road, the truck chassis is excited by dynamic forces caused by the road roughness, engine, transmission and more. modal analysis using finite element method (fem) ...

The fuel type not only influences the engine power and exhaust emissions, but dilutes lubricating oil. We studied effects of biomass fast pyrolysis fuel, or biofuel, on tribological behaviour a fully formulated oil (FFEO) used for heavy-duty diesel engines by reciprocating sliding tribometer, which simulated conditions an cylinder liner piston ring. analysed surface morphology, roughness, eleme...

This paper presents the effect of hull roughness over 10 years operation on ship performance. The numerical model is developed by coupling NavCad and Matlab to perform computation data processing. On basis a given hull, an engine, optimized propeller, performance computed for eight cases according ITTC recommendations in both calm waters different weather conditions along route. wind waves cons...

Honing processes are usually employed to manufacture combustion engine cylinders and hydraulic cylinders. provides a crosshatch pattern that favors the oil flow. In this paper, Adaptive Neural Fuzzy Inference System (ANFIS) models were obtained for tool wear, average roughness Ra, cylindricity material removal rate in finishing honing processes. addition, multi-objective optimization with desir...

[1] The deposition and attachment mechanism of settling snow crystals during snowfall dictates the very initial structure of ice within a natural snowpack. In this letter we apply ballistic deposition as a simple model to study the structural evolution of the growing surface of a snowpack during its formation. The roughness of the snow surface is predicted from the behaviour of the time depende...

The mesoscale numerical weather prediction model MM5, the 5 generation Pennsylvania State University/NCAR Mesoscale Model, uses a global land-use map to set the physical parameters on the surface characteristics to model the soil-atmosphere processes. These parameters are albedo, emissivity, thermal inertia, roughness length and soil moisture. A new estimation of soil parameters is done for the...

Three synchronized pulsed Doppler wind lidars were deployed from May 2016 to June 2016 on the shores of a wide Norwegian fjord called Bjørnafjord to study the wind characteristics at the proposed location of a planned bridge. The purpose was to investigate the potential of using lidars to gather information on turbulence characteristics in the middle of a wide fjord. The study includes the anal...

The existence of a critical roughness height for outer layer similarity between smooth and rough wall turbulent boundary layers is investigated. Results are presented for boundary layer measurements on flat plates covered with sandgrain and woven mesh with the ratio of the boundary layer thickness to roughness height /k varying from 16 to 110 at Re =7.3 103–13 103. In all cases tested, the laye...

surface roughness is a significant parameter which determines the efficiency of optical components. surface damages induced by grinding strongly influence the mechanical strength and optical quality of optical glasses. it is meaningful to rapid evaluate the surface roughness through the measurement of different grinding parameters. in this study, a cup diamond wheel (d64) is used in grinding pr...