The paper analyzes the components of cam profile a camshaft an internal combustion engine. authors developed method calculating width and area contact, as well degree slippage occurring in friction pair consisting tappet sleeve, resistance to wear profile, depending on roughness surfaces working lubricating medium. Studying parts shows that uneven occurs along its surface. values parameters aff...

In this paper, we describe a voice synthesis model developed for musical purposes. Based on a source-filter model, this synthesizer has been specifically designed to allow the synthesis of natural sounding singing voices by including pitch and amplitude variations and by careful tuning of consonant to vowel transitions. A particular attention is given to the reproduction of plosive consonants. ...

In order to prolong the service life of multistage axial compressors, it is increasingly important study influence blade surface roughness on compressor performance. this paper, a five-stage real aero-engine was selected as research object, and an equivalent gravel model used based measured data. Furthermore, impact performance at design rotational speed studied by full three-dimensional numeri...

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...

investigations were carried out to evaluate the performance of direct injection diesel engine with medium grade low heat rejection (lhr) combustion chamber and 3 mm air gap insulated piston, 3 mm air gap insulated liner, and ceramic coated cylinder head [ceramic coating with the thickness of 500 µ was made on the inside portion of the cylinder head].the engine had different operating conditions...

this study was carried out to investigate the effect of esterification on the surface roughness of eastern cottonwood. eastern cottonwood was modified without using any catalyst and solvent at different temperatures and times with two linear chain carboxylic acid anhydrides (acetic anhydride or propionic anhydride). different weight percentage gains (wpgs) were obtained at different conditions....

in this paper, surface roughness of ht29 cancerous is determined using topography images obtained by atimic force microscopy (afm). the mean radiuses of cell and substrate surface asperities are determined, based on results of conducted roughness analysis and rabinovich roughness theory. these values have been applied in the equations of rough particle nanomanipulation dynamic model and the amo...

abstract in all river engineering projects, determination of flow resistance is essential. most commonly, the manning roughness coefficient, , is used to describe the flow resistance or relative roughness of main channel or flood plane. over the past decades little or no study has been conducted to investigate the effects of particle shapes on manning roughness coefficient. therefore, it is the...

A cost reduced method of producing injection molding tools is reported and demonstrated for the fabrication of optical microlens arrays. A standard computer-numerical-control (CNC) milling machine was used to make a rough mold in steel. Surface treatment of the steel mold by spray coating with photoresist is used to smooth the mold surface providing good optical quality. The tool and process ar...