DYNAMIC MODELING OF WORKING SECTIONS OF GRASSLAND OVERSOWING MACHINE MSPD-2.5.

The paper presents the dynamic modelling using an analyzing and optimization software of working sections, which is equipped with an oversowing machine MSPD-2.5. The oversowing machine for degraded grasslands MSPD-2.5 is a farming equipment carried on rear 3 point hitch of I/II category of the tractors and is composed of 17 independent sowing sections, situated on two rows (8 sections in the front and 9 sections in the back) articulately tied of the machine body through some deformable parallelogram type mechanisms. The dynamic modelling method and simulation of the sowing section, using the Inventor 2010 software, supposes going through three main stages: pre-processing (virtual modelling of the sowing section); processing (rolling the dynamic analysis); post processing (working the results). The dynamic model developed was realized using the following elements: 3D models sowing section components, the cinematic couplings between the components, the mass components characteristics, and the external forces system which acts on the sections. As a consequence of the process there were graphically represented variations of joint forces and of torques, the force variation and the length of the elastic element (coiled spring), and on their basis using the analysis of finite element there were represented the tensions which occur in the elements of the sowing sections. [ABSTRACT FROM AUTHOR]