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friction
Many physical systems such as biochemical processes and machines with friction are of nonlinearly parameterized systems with uncertainties.
      
Experimental Research on Friction of Vehicle Tire Rubber
      
A newly developed tire rubber friction test machine is introduced.
      
Test data of tire rubber friction on concrete and icy road surfaces are obtained and analyzed.
      
The effect of different road surface, ambient temperature, contact pressure, and slip velocity on friction coefficient is apprehended.
      
The dynamic friction is introduced to tire semi-empirical modeling, and the accuracy of the model is improved.
      
One is to change the ionic concentration of lubricants by adding additives, and the other is to apply an external electric field on friction pairs.
      
Characteristic parameters such as pressure parameter and friction parameter are calculated by substituting tested data into their corresponding equations.
      
Much more attention has been paid to the tribo-electrochemical mechanisms for the control of friction and wear.
      
A method based on the energy dissipation mechanism of an Independent Oscillator model is used to calculate the frictional force and the friction coefficient of interfacial friction.
      
The friction work is calculated with considering the potential change of contact surfaces during sliding.
      
The results agree with that of adhesion friction equations.
      
The transient thermo-elastohydrodynamic (TEHL) lubrication simulation and isothermal elastohydrodynamic (EHL) simulation were performed on the exhausting camtappet friction pair of an internal combustion engine.
      
In this case, the mixture area consists of abrasive dust from friction pairs, and the surface film is distributed with crumby hard granules, exiguous oxide, carbide granules and sheared slender fibre.
      
At the beginning of wear, the hard peaks from the friction surface of the disc-brake plough on the surface of the brake block.
      
With increasing frictional temperature, the friction surface begins to soften and expand, and oxidized wear occurs at the same time.
      
During the high-temperature wear period, severely influenced by friction heat, obvious softening and plastic flow can be found on the friction surface of the brake block, its anti-shearing ability is weakened, and adhesive wear is intensified.
      
In addition, thermal cracking, thermal oxidization, carbonization and cyclization of organic substances on the surface of brake block can make the friction surface produce pores or cracks, thus fatigue wear occurs.
      
The fine size and homogenous distribution of the grain can be achieved by controlling the shape of the preform die and improving the friction condition.
      
Results were presented as plot of Colburn j factor and friction factor f against the Reynolds number in the range of 500-6500.
      
 

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