2 results about "Coefficient of friction" patented technology

A system and method for estimating surface coefficient of friction in a vehicle system. The method includes providing a kinematics relationship between vehicle yaw-rate, vehicle speed, vehicle steering angle and vehicle front and rear axle side-slip angles that is accurate for all surface coefficient of frictions on which the vehicle may be traveling. The method defines a nonlinear function for the front and rear axle side-slip angles relating to front and rear lateral forces and coefficient of friction, and uses the nonlinear function in the kinematics relationship. The method also provides a linear relationship of the front and rear axle side-slip angles and the front and rear lateral forces using the kinematics relationship. The method determines that the vehicle dynamics have become nonlinear using the linear relationship and then estimates the surface coefficient of friction when the vehicle dynamics are nonlinear.

The invention provides a low-friction thin film for the inner wall of a solar panel driving bearing and a preparation method of the low-friction thin film, and relates to the technical field of material thin films. The low-friction thin film is of a multi-layer structure, the bottom layer of the thin film is attached to the surface of the inner wall of the bearing, a Ti layer, a MoS2-Ti / Pb layer, a graphene layer and grooves distributed in the surface of the inner wall of the bearing are sequentially arranged from the inner wall of the bearing to the outside, and the grooves are filled with lubricating materials. The preparation technology is simple, the composite film is of a three-layer structure, the thickness is only 2.5 microns, the good low-friction and high-mechanical-strength effects can be achieved, the roughness of the film is lower than 6 nm, the hardness is higher than 7 Gpa, the friction coefficient is lower than 0.03 in the vacuum 7 * 10 <-4 > Gpa environment, and the composite film can be suitable for various complex external environments and has the wear-resisting and lubricating effects.