The simulation of agricultural and forestry processes provides a huge potential in terms of process understanding. At the Institute of Mobile Machines and Commercial Vehicles of Technische Universitaet Braunschweig agricultural materials like grass, straw and wood are simulated by using the Discrete Element Method (DEM). The DEM offers the possibility to define different structural models which consist of discrete elements connected by flexible bonds. By parametrising the flexible bonds of the stalks different physical properties can be considered. In order to model the natural behaviour of stalks the physical properties have to be measured in advance. Therefore different test rigs are used. Additionally at the Institute different cutting, conveying and compacting processes of agricultural machinery are regarded. An overview of the key results, the potential of the DEM and future research activities is given.
Mechanization in agriculture & Conserving of the resources
Vol. 61 (2015), Issue 2
Table of Contents
We propose а new method to research technology and testing of a new generation of inclined camera of harvesting machines, in particular method of determining the coefficient of biomass leveling on the inclined camera connected with non-uniform load across the width of harvester, influence of non-uniformity on indicators of threshing and separation, determining the cause resulting in such loading from the research work on different types of agricultural crops.
The original design of a cavitator is a volute (snail) with a tangential inlet connected to the pump and an axial outlet which is attached to the body in the form of a cylindrical tube, which ends with a braking device and a central hole connected to inlet of the pump.
Proposal: 1) to equip cavitator with axial gas extractors in the volute (snail) and at the output from the body, 2) exclude the snail (volute) from the construction and control the interaction of flows by dividing stream leaving the pump into two parts and then merge them in the camera in front of body, 3) organize an axial jet in body with the required structure by using ring nozzles, 4) reduce a vortex component of the current by installing a second straightening snail (scroll) before the body, 5) design the pump as an active generator of elastic vibrations of useful frequencies while maintaining its primary function; – separate it with antivibration bushing.
The aim of the paper was to propose conception of autonomous robot for sowing and wide row planting. Autonomous work of the robot in range of traction and agronomic processes will be implemented on the basis of data from a many sensors (cameras, sensors position, sensors distance, and others). Positive test results will allow for the use of the robot in organic crops requiring mechanical removal of weeds or in crops with application of selective liquid agrochemicals limited to the minimum The use of a vision system, based on the map coordinates of the position of the sown seeds , will allow for their care on an early stage of plant development. The applicability of the robot to onerous work in organic farming may encourage farmers to discontinue the use of herbicides in crops include sugar beet, corn, etc.
Conducted analytical studies, resulted in the construction of a new mathematical model of plane-parallel motion combined simultaneous sowing unit and bandpass mineral fertilizers. If you use the original equation in the form of Lagrange II-the kind, the system was composed of six differential equations of motion, that describes the behavior of the combined unit with its plane-parallel motion. Defined analytical expressions for the forces, that act on the machine unit, can be solved on the PC.
New constructional solutions of scissor-finger cutting unit and the drum cutter bars characterised by higher functioning efficiency with reference to well known constructions applied in machines for plant material’s harvesting, are presented in the paper. New constructions of the cutter bars have been designed and performed in the Division of Engineering Machines, Faculty of Mechanical Engineering of the University of Science and Technology in Bydgoszcz.