Open AccessDetermination of lateral tire drag coefficients to achieve the required performance characteristics of machine-tractor unit
Author(s) -
Н. В. Сергеев,
Сергеев Н. В,
Sergey Senkevich,
Сенькевич С. Е
Publication year - 2019
Publication title -
traktory i selʹhozmašiny
Language(s) - English
Resource type - Journals
eISSN - 2782-425X
pISSN - 0321-4443
DOI - 10.31992/0321-4443-2019-1-70-74
Subject(s) - tractor , tread , slip (aerodynamics) , curvature , slip angle , angular velocity , torque , tire balance , traction (geology) , drag , rolling resistance , mechanics , slip ratio , line (geometry) , control theory (sociology) , brake , structural engineering , automotive engineering , engineering , physics , mechanical engineering , mathematics , computer science , geometry , materials science , classical mechanics , aerospace engineering , natural rubber , artificial intelligence , composite material , control (management) , thermodynamics
This article considers the possibility of determining by analytical calculations such indicators of the drag coefficients for lateral removal of the pneumatic tires of the front and rear wheels of a tractor, at which acceptable traction characteristics of the tractor, the required performance of the unit and the provision of a given trajectory movement of the unit will be provided. Developed by Mstislav Keldysh theory of the rolling of a pneumatic wheel gives the most appropriate model of lateral slip. With an unsteady lateral slip, the center of the contact imprint describes a trajectory called the tire rolling line. If there is no slip, the middle line of the tread within the contact area, coincides with the rolling line. So in the vicinity of the center of the site, its absolute speed and angular velocity of this area equals zero. And the curvature of these coincident lines is determined by the lateral and angular deformations of the tire. For the practical implementation of the adopted design models of the tire, it is necessary in the equations to determine the ratio of the curvature coefficients and the magnitude of the slip function. Experimental studies of a tilled unit with a blocked cultivator sample are given.