The Study And Simulation Of Dynamic Behavior On High Density Baler

For advanced study on the high density compression, fresh alfalfa with 70% moisture is compressed on the model 9KG-350 high density hydraulic baler. The dynamic behavior of alfalfa during compression process is analyzed and simulated with virtual prototyping. Through analyzing the experimental data about stress, displacement and thickness of grass piece, the compression process is divided into three phases: direct compression, rheology and rebound. The relation between stress and distortion of grass piece is gained, and the simulation parameters of the three phases are found. The digital model of high density bale is constructed with Pro/E, which is imported into ADAMS by'Parasolid'format. Through analyzing and simulating the dynamic behavior of feeding mechanism and grass piece during the three phases with ADAMS, the optimum sizes of components in feeding mechanism are obtained and the model for compression is confirmed. By controlling the stiffness coefficient of alfalfa model during three compression phases with the con-simulation technique of ADAMS/controls & MATLAB/Simulink, the simulation of dynamic behavior is performed and the relation between power consuming and density, stiffness coefficient and density are found. The conclusion, there is a critical density in the process of compression, is drawn from the simulation experiment about compressibility of alfalfa. The power consuming is obviously different before and after the critical density.