Investigation in dynamics of sowing machine-tractor assembly unit

Abstract

The purpose. To study efficiency of use of sowing machine-tractor assembly unit using theoretical and experimental dynamic and power indexes. Methods. Classical mechanics, mathematical simulation, solution of systems of nonlinear differential equations. Experimental researches were lead with application of physical simulation and tests. Results. Three-mass dynamic model of plane-parallel movement of multiple-elements machine-tractor sowing unit in structure of tractor of classical arrangement HTZ-16131 and soil-cultivating unit APP-6 was made. Dynamic model had one degree of freedom. The event was considered of movement of assembly unit at which the angle of rotation of steered wheels was set according to sinusoidal (harmonic) law. Angles of rotation, speeds of movement and forces acting on elements of the assembly unit were calculated. The measuring system of dynamics and energetic of mobile machines was developed for holding experimental researches. The system is designed for determination of kinematic, dynamic, capacity and power characteristics of mobile machines and their elements at road, field and benchmark testing. An innovative component of measuring system is the method of determination of slippage of wheels or driving sprockets. It consists in determination of speed of twirl of the wheel by means of gyroscope and accelerometer. Results of experimental researches which have confirmed adequacy of mathematical model of dynamics of the assembly unit are gained. Conclusions. Angles of rotation of elements of the assembly unit looked like sinus-wave oscillations. It was established that seeder had low average speed of movement and the greatest range of vacillating. During experimental researches of the assembly unit it was established that it works in satisfactory conditions.