Simulation modeling allows researching a mechanism consisting of many links interacting with each other according to complex laws. In order not to write a model for each node of the investigated mechanism, it is advisable to use ready-made blocks of the Simulink application. To simplify the process of creating blocks responsible for the links of the mechanism, we used the Solidworks computer-aided design system. 3d models of each link were designed, kinematic connections between them were established. Thus, the mass characteristics of the links, their geometric parameters, moments of inertia and kinematic pairs were obtained. After exporting the model from the computer-aided design system to Simulink of the Matlab package, a basic block diagram was obtained which was supplemented with disturbing input signals, virtual oscilloscopes for characterizing, mechanical transmission units, etc. Based on the obtained coordinates of the frame links and the rotor knives, dependencies were constructed to determine the kinematics of their movement in three planes, which made it possible to clearly demonstrate the top and rear view of the mechanism under study in the considered time interval. The developed simulation model can be upgraded to study the dynamic characteristics of the mechanism.
Brush cutters are used in forestry for the care of forest plantations in operations for cutting unwanted tree and shrub vegetation (TSV). Rotors can be used as working bodies. The rotor we are considering is a flywheel, on the outer sides of which the blades are hinged. When cutting DKR with blades, a cutting moment arises, which is transmitted through the knife to the axis of its rotation and then to the shaft driving the flywheel. When designing a brush cutter structure, the impact from the cutting forces of the DKR is decisive for the choice of drive power and rotor parameters. We designed the brush cutter rotor in CAD Solidworks to study the cutting process of the DKR. Its geometric and mass parameters were set; the kinematic links of the links were established. The input motion characteristics were set in the Motion Solidworks module and the cutting moment was applied to the knives. Virtual sensors were installed on the model to record movement characteristics. As a result of a computer experiment for three options, which differ in cutting force and the presence of a damper, the trajectories of the knives and the power consumption of the drive were established
When caring for forest crops, it is necessary to prune the branches. Cutting of top branches is carried out in nurseries, removal of shrubs - on clearings, the formation of crowns - in forest shelterbelts. It is difficult for the operator to simultaneously control several hydraulic cylinders and maintain the required position of the working body. It becomes possible to automate the process of pruning branches with the development of digital means of visual and automatic control. It is necessary to determine the control actions on the hydraulic cylinders of the branch cutter to automate the work of the operator. Modern technological equipment is designed in computer-aided design (CAD) systems. It enables using a numerical method to conduct a computer experiment on a simulation model. The design of the cutter in Solidworks have been made. A simulation model has been compiled. The simulation model takes into account geometric, kinematic and inertial parameters of the cutter chains. The movement of the cutter working body from the transport position to the working one has been studied. Virtual displacement sensors have been installed on the chains in the Motion Solidworks module, and cutter paths have been obtained. The resulting control actions can be used as an input parameter for simulation models in other mathematical environments, and when creating prototypes of cutting control mechanisms
To remove unwanted tree and shrub vegetation, it is necessary to use mechanized implements aggregated with traction means - tractors. The power consumption of the drive of these tools depends on their mass and the principles of the cutting process. Currently, mulchers, which are designed to grind felling residues with a diameter of tens of centimeters, remove shrubs with a diameter of up to several centimeters, which leads to unreasonably high costs for this type of work. The article studies the designs of frames and working bodies of brush cutters, which are a rotor rotating in a horizontal plane with a knife fixed on a flexible connection or hinge. On the basis of the structures, hypotheses have been put forward about the advisability of using the considered types of working bodies when cutting tree and shrub vegetation, taking into account its diameter. Using the presented connections between the types of working bodies and their ability to cut tree and shrub vegetation, it was revealed the possibility of developing narrowly focused mathematical models, which will reduce the energy consumption of hedge trimmers and increase their efficiency. The presented designs of rotors themselves are also insufficiently studied from the point of view of kinematics and dynamics of movement of their links, which is of certain scientific interest.
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