Magic Formula를 이용한 아스팔트 노면에서의 농업용 트랙터의 견인력 추정

Abstract

Agricultural tractors drive and operate both off-road and on-road. Tire road interaction significantly affects the –tractive performance of a tractor, which is difficult to predict numerically. Many empirical models have beendeveloped to predict the tractive performance of tractors using the cone index, which can be measured throughsimple tests. However, a magic formula model that can determine the tractive performance without a cone indexcan be used instead of traditional empirical models as the cone index cannot be measured on asphalt roads. Theaim of this study was to predict the tractive performance of a tractor using the magic formula tire model. Thetraction force of the tires on an asphalt road was measured using an agricultural tractor. The dynamic wheelload was calculated to derive the coefficients of the traction slip curve using the measured static wheel load and –drawbar pull of the tractor. Curve fitting was performed to fit the experimental data using the magic formula. The parameters of the magic formula tire model were well identified, and the model successfully determined thecoefficient of traction of the tractor.