Validation for the Method Measuring Lateral Stability Angle Belonging Tractors and Agricultural Machines

Abstract

The article presents the results of validation for the method of mea­suring the lateral stability in tractors, trailers and agricultural machines. The method was developed in the testing laboratory of the State Scientific Institution «Leonid Pogorely Ukrainian Research Institute for Forecasting and Testing Equipment and Technologies for Agricultural Production», Kharkov branch. The method developed for measuring the angle of lateral stability is based on measuring the mass of the machine on boards in a horizontal and inclined position. Evaluation of lateral stability is carried out through an indirect indicator — the ratio of the mass of the machine bead in a horizontal position and inclined. The application of the develo­ped method does not require determination of the coordinates of the cen­ter of mass of the machine and the use of platform stands, but provides only for measuring the mass of the machine in a horizontal position and at an angle when lifting one of the sides. A method for calculating the metrological characteristics of the proposed method is given. The error in measuring the angle of transverse stability of the proposed method consists of the error in measuring the mass of the machine and the uncertainty in measuring the angle of elevation of the machine’s edge. These values are independent and uncorrelated. The measurement error of the lateral stability angle is determined for the range of the real values masses of the machines and the angle at which they can be lifted aboard in safety conditions. As a result, validation is established. The method of measuring the lateral stability of a machine by successively weighing its sides is sui­table for use. Its following characteristics. Requirements for the accuracy of measuring instruments: the measurement error of the angle of inclination of the machine — no more than ± 0,1°; measurement error of the mass of the machine — no more than ± 4 kg. The total absolute error of the me­thod: when the mass of the machine is (2000)—(2300) kg — not more than 1,5°; with a mass (2300)—(10000) kg — 1,0°; with a mass of 10,000 kg or more — 0,5°. The range of measured values of the lateral stability angle is (25—45)°. The angle at which the machine climbs is (5—15)°. The scope of application of the method: tractors, trailers, agricultural machines. Table — 4. Figure — 4. References — 10.