Self-propelled forage harvesters (SFH) are used for cutting forage such as grass or maize for preservation in a silo. High throughput and an optimal quality of feed are the reasons that the SFH has expanded its market position in the last decades. Most of the energy is used for the cutting process in a knives drum. For a targeted process optimisation in consideration of cutting energy and quality, it is necessary to analyse the process with different cutting parameters. Research is based on the knife drum unit aim of the presented research is to analyse the cutting process uncoupled from the rest of the chopping process. This is realised with a test rig which can measure cutting forces and records the motion of the cutting crop during the cutting process at high cutting seeds, as well. The acquired force data record of knife and shear bar and recording of the cutting distance are the basis for calculating the specific cutting energy. The processes cutting, transporting and transfer in a knife drum of a forage harvester affect each other. Only when the influences of the processes parameters of the whole chopping process are know, can the optimisation be successful. The test rig consists of a horizontally rotating rotor supported in a rigid base frame. The holding device of crop and an integrated shear bar are fixed on the base frame. The rotor is driven by an electric motor with integrated frequency converter. Knives and holding device of crop are completely connected with the force sensors so that no force bypass can emerge. Based on substituted mechanical systems the cutting process has been analysed and thus the basis for a simulation is provided. Further cutting parameters which have not been examined in the tests because of the too high complexity can be varied.
The cutting process in a self-propelled forage harvester
Der Schnittvorgang in einem selbstfahrenden Feldhäcksler
Innovation und Integration, AgEng - LAND.TECHNIK, Tagung Landtechnik - Agricultural Engineering, 62 ; 281-286
VDI-Berichte ; 1855
2004
6 Seiten, 5 Bilder, 7 Quellen
Conference paper
English
A Flexible Hydraulic System for a Self-Propelled Forage Harvester
SAE Technical Papers | 1985
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