Showing papers on "Slip ratio published in 1973"

Method, circuit, and apparatus for anti-skid brake control in motor vehicles

Abstract: Anti-skid brake control system in which the slip ratio of a wheel is calculated from a simulative vehicle speed which is obtained by simulatively detecting the vehicle speed and speed of a wheel to be controlled. Logic circuitry discriminates whether or not the slip ratio is within a predetermined slip range of 20-60% producing large adhesive coefficients. Hydraulic brake pressure is reduced in response to decleration of the wheel and is increased in response to acceleration of the wheel when the slip ratio of the wheel is within the predetermined slip range.

Automatic skid reduction control method and device for a braking system

Abstract: An automatic brake controlling method and device for applying brake pedal forces to a wheel of a moving vehicle, includes acceleration detecting apparatus for detecting the acceleration of a moving vehicle; wheel velocity detecting apparatus for detecting a wheel speed of the moving vehicle; feedback apparatus for computing the vehicle velocity by integrating the detected acceleration, comparing the vehicle velocity and the wheel velocity, feeding back the difference signal between the vehicle velocity and the wheel velocity, and memorizing the difference signal; auxiliary feedback apparatus for feeding back an electrical signal according to the difference signal; computing apparatus for computing whether a slip ratio of said wheel velocity to said vehicle velocity is larger than a predetermined value or not; and controlling apparatus for controlling the brake force to a reduced level whenever said slip ratio is larger than said predetermined value on the application of the brake, thereby compensating the operational error of said integrator apparatus when the brake is gently applied for a long time.

Recent studies of tire braking performance

Abstract: The results from recent studies of some factors affecting tire braking and cornering performance are presented together with a discussion of the possible application of these results to the design of aircraft braking systems. The first part of the paper is concerned with steady-state braking, that is, results from tests conducted at a constant slip ratio or steering angle or both. The second part deals with cyclic braking tests, both single cycle, where brakes are applied at a constant rate until wheel lockup is achieved, and rapid cycling of the brakes under control of a currently operational antiskid system.

Diffusion and thermal slip of a binary gas mixture

Abstract: Let us note that the phenomenon of diffusion slip at a constant gas-mixture temperature has been considered in [1], for example, and thermal slip for a single-component gas in [2]. The slip velocity of a binary gas mixture has been calculated in a field of the temperature gradient and of the partial pressure gradients. The kinetic equation is solved by an approximate method based on physical considerations. A formula has been obtained analytically for the slip velocity for arbitrary accommodation coefficients as well as for arbitrary gas concentrations and arbitrary molecule masses. The results agree to 1% accuracy with the numerical computations of other authors.

Heat transfer in channels in the laminar flow of a non-newtonian liquid with slip

Abstract: We consider the case of quasi-isothermal heat transfer in the laminar flow of a non-Newtonian medium with slip in circular and plane channels. The calculation is based on the simultaneous solution of the equations of energy, motion, and a rheological relation with the specific boundary conditions which takes into account discontinuity in the velocity and temperature on the heat-transfer surface.