USING THE PRINCIPLES OF KINEMODYNAMICS FOR TRACTION TESTS OF MOBILE MACHINES

The study aims to develop a method for traction testing of mobile machines using the principles of kinemodynamics. To achieve these goals, it is necessary to: justify the method of traction testing of mobile machines using the principles of kinemodynamics; and carry out experimental validation of the proposed test method.Methods and materials. The methodological basis of the work is the principles of kinemodynamics, namely partial accelerations. The development of a test method consists of determining the possibility of measuring the established indicators and assessing the method’s suitability. To determine the power and energy characteristics of mobile machines, it is proposed to use a measuring complex consisting of a linear accelerometer and special software for processing the measured data.Results. A method for traction testing of mobile machines using the principles of kinemodynamics has been developed; experimental validation of the proposed test method was carried out. The essence of the method is the direct measurement of longitudinal accelerations that occur during the acceleration of a car and the subsequent processing of the results of these measurements, using an energy approach based on determining the change (difference) in the kinetic energy of the car over a certain period. This made it possible to determine the force on the wheels of the car, which leads to its acceleration (or maintaining uniformly accelerated motion) and the share of engine power spent on this car. An experimental validation of the developed method was carried out, which consisted of determining the coefficient of agreement of test results with variations in certain specific factors.Conclusions. The use of the principles of kinemodynamics allows us to determine the fraction of force that leads to acceleration during the acceleration of the car and the fraction of engine power expended. Based on the test results obtained by the proposed method, the following analysis can be made: determine the conditions (gear ratio in the gearbox) under which maximum acceleration is possible, determining the share of the maximum possible design force in each gear used to accelerate the machine; determine the weighted average power reserve of the machine engine, which can be used to overcome additional interference. Experimental validation of the proposed method in terms of agreement showed satisfactory results.Keywords: traction tests, method, coincidence coefficient, power, traction force, acceleration.