Computer assisted simulation of forage chopping process
2019
Popa, R., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Popa, V., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania)
Nowadays choppers are equipped with knives that are inclined toward the drum generator for progressive cutting. Optimal inclination depends on the nature of the chopping material. This paper presents a method for simulation and analysis of the cutting process of forage from a drum chopper. Initial equipment parameters were entered into an analysis program to calculate stress distribution on the knife and material over time. The knife and shredding material were designed in SolidWorks. Simplified models for both knife and shredding material were opted for simulation. These simplified models were imported into Ansys 18.0 in order to simulate the forage cutting process. To simulate the cutting, forage maize has been chosen as the material to be cut. The Explicit Dynamics module present in Ansys was used for simulation. For the straight knife the maximum stresses appear, as expected, on the tip of the knife and have a relatively uniform distribution along the edge of the knife. Also for the straight knife tensions grow relatively quickly, reach the maximum, then after the knife has penetrated the material, tensions begin to gradually decrease. The maximum stresses on the inclined knife appear first on the corner that first penetrates the material, then spread along the knife as it penetrates the material. Unlike the straight cut, here the maximum stresses are lower, but they stretch over a longer period of time and then start to decrease. Of the all inclined knives simulated the knife inclined at 15º showed the lowest stress value and the smallest stretch of maximum stress over time.
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