Measuring method for motion resistance coefficient of cross-country roads

Abstract

The invention discloses a measuring method for the motion resistance coefficient of cross-country roads. The measuring method comprises the steps of (S1) measuring a relation Eta2 between the efficiency and the speed of an action system of a caterpillar vehicle; (S2) obtaining a driving torque T by using the driving torque of an engine under different speeds to deduct the loss of an auxiliary system; and (S3) calculating the motion resistance coefficient of the cross-country roads according to the formula, namely f=(tEta1Eta2 / r-FA) / G, wherein f is the motion resistance coefficient, Eta1 is the efficiency of an engine transmission system, r is the radius of a driving wheel of the caterpillar vehicle, F is the air resistance applied to the vehicle, and G is the weight of the caterpillar vehicle. The measuring method disclosed by the invention has the advantages that by a simple and effective method, the factors such as the internal resistance of the action system and the influence on the resistance coefficient caused by the speed are considered, so that the motion resistance coefficient of the cross-country roads is accurately measured; and the measuring method has good guiding significance on application and research of engineering.

Description

technical field [0001] The invention belongs to the relevant technical field of military tracked vehicles and various tracked engineering vehicles, and relates to a method for measuring the resistance coefficient of off-road road movement. Background technique [0002] For the overall design of tracked military vehicles and engineering vehicles, it is of great significance to determine the resistance coefficient of off-road road surface movement, because the off-road road surface resistance coefficient will affect the average off-road speed of the vehicle, and then affect the overall vehicle designer's selection of power devices. In the past, the measurement methods for the resistance coefficient of off-road road surface movement used in the design of tracked vehicles mainly include the traction method and the inertia method, but the movement resistance measured by the above two measurement methods is not only caused by ground deformation, but also includes road wheels and T...

AI Technical Summary

Problems solved by technology

In the past, the measurement methods for the resistance coefficient of off-road road surface movement used in the design of tracked vehicles mainly include the traction method and the inertia method, but the movement resistance measured by the above two measurement methods is not only caused by ground deformation, but also includes road wheels and The internal resistance part of the action system, such as the friction between the tracks and the friction of the road wheel bearing, does not consider the influence of the vehicle speed. The measured resistance coefficient of off-road road movement is a constant value that has nothing to do with the vehicle speed, and the result is not very accurate.

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