Influence of the Seed Shaft Parameter of the Linter Machine on the Dynamics and Load of the System
Аннотация
This paper deals with the dynamic study of a machine unit with the mechanism of the seed shaft of a linter machine designed for cleaning cotton fibre from seed residues. Taking into account that the working bodies of the machine operate under variable loads, the authors carry out a comprehensive analysis of the influence of inertial, elastic and dissipative properties of the system on the transient and steady-state modes of its operation. Particular attention is paid to moments of inertia, resistance of the technological environment and the influence of belt transmission parameters. The mathematical model is formulated on the basis of Lagrangian equations of the second kind taking into account the moments of resistance arising in the process of linting. The drive is investigated as a two-mass system, and the model also takes into account the oscillations of the process resistance moment described by a sinusoidal function. For numerical solution of the system of nonlinear differential equations the Runge-Kutta method in Mathcad environment is applied. Calculations at different values of stiffness, viscous friction and resistance amplitude coefficients determining the dynamic behaviour of the system have been carried out. Graphs of change of torque, angular velocity of rotor and seed shaft, as well as dependence of start-up time on the level of technological resistance were obtained. It is established that the increase of the moment of technological resistance leads to the decrease of the torsional oscillation range, but increases the angular velocity of the motor, contributing to the reduction of the steadystate time. The results of the research allow optimising the parameters of the machine unit, increasing the stability of its operation and energy efficiency. The work is of interest to developers and researchers of machines in the cotton processing industry, as well as specialists in the field of applied mechanics