Abstract
The article contains generalized systems of equations describing the vertical and longitudinal-angular vibrations of the main parts of the tractor with the mathematical model of the hierarchical vertical linear oscillation of the tractor, the irregularities of the roads, taking into account the rigidity and damping. It includes systems: equations describing the vertical vibrations of the skeleton over the propellers of a tractor on an uneven road; equations describing the vertical vibrations of the cab of the rear of the tractor, taking into account the walking of the tractor on uneven roads. Equation systems have also been compiled that describe the vertical oscillations of the uppermost hierarchical link - the seat of the tractor operator, taking into account the walking of the tractor on an uneven road. The use of this original mathematical model will make it possible to find random unwanted oscillations of the new designed machine design. It will help to optimize their geometric and dynamic parameters.
Highlights
The calculation method of the lower rubber damper of the cab allows you to determine the geometric dimensions of the mechanical sub-cab damper.Using the definition of the vibration of a linear system with one degree of freedom of the under-cab shock absorber of a tractor, we can find the coefficient of efficiency of vibration isolation, which notifies the presence or absence of vibration of the operator's cab.By numerically solving these equations, we can find the angular and vertical displacement and angular velocity of the cab and the main parts of the tractor
The power load and the speed of the tractors are constantly increasing, which leads to an increase in the dynamic load of the main parts and an increase in the level of oscillations generated by them
The hierarchical link of the tractor was mathematically modeled, taking into account the unevenness of the roads based on the coefficient of stiffness and damping
Summary
The calculation method of the lower rubber damper of the cab allows you to determine the geometric dimensions of the mechanical sub-cab damper. Using the definition of the vibration of a linear system with one degree of freedom of the under-cab shock absorber of a tractor, we can find the coefficient of efficiency of vibration isolation, which notifies the presence or absence of vibration of the operator's cab. By numerically solving these equations, we can find the angular and vertical displacement and angular velocity of the cab and the main parts of the tractor. Studies have established that the natural frequency of human vibrations on the seat of modern wheeled tractors is 1 3 Hz, and the permissible values of the root-mean-square accelerations and amplitudes of vertical movements of the seat should not exceed 8.5 m / s2 and 0.02 m, respectively, which is stipulated by GOST 12.1. 012-90 and Council Directive No 78/764
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