Research On Performance Analysis And Structure Optimization Of Treedozer

Because of the needs of the exploitation of virgin land, forest exploitation and making new farmland, treedozers and other uprooting machineries have been frequently used in the forestry production in recent years. The operating environment where the treedozer is mainly used is often a dense growth of trees or a primeval forest, such as tropical rainforest in Southeast Asia, etc. Meanwhile, the working condition of the treedozer is also more complex, it is not only used in uprooting trees, but also in cleaning up the root, blading and clearing obstacles, etc. Therefore, the treedozer tends to bear large external loads during the operation, meanwhile, the strength of the component parts and the positional relations between components also have a significant impact on the working performance of the treedozer.A deep research on the performance and structure optimization analysis of a treedozer has been carried on in the article, the mechanical device of the treedozer and frame are regarded as the objects of the study, the theoretical calculation in combination with the rigid-flexible coupling simulation has been used to research on the structural and dynamic performances, and then the optimization is studied by means of MATLAB software on the basis of the above analysis. The main contents of this paper are as follows:1. This article has analyzed the background and significance of the research content, summarized the current state of research on the arboreal anchorage performance, briefly introduced the development and application status of the optimal design of machine and introduced research objectives and methods.2. As for the part of structural analysis: firstly, the constitution of mechanism of the mechanical device of the treedozer has been analyzed. Secondly, the movement and displacement conditions of the whole mechanism have been analyzed, and the analytic expression for the change in the position of the key hinge point with the lift cylinder has been established through the associations between links. In the end, based on the analysis of force bearing status of the tree stinger, the force bearing status of the whole mechanical device of the treedozer has been established.3. As for the part of performance and mechanics analysis: firstly, the flexible bodies of the launching bridges and frame were built up based on ANSYS software. Secendly, the rigid-flexible coupling model of the treedozer was established after the flexible bodies were imported into ADAMS. Thirdly, the simulation analysis was carried out after the associated parameter values of simulation were configured. In the end, based on the analysis above, the mathematical expressions of the stresses in the dangerous sections of the launching bridges and frame have been established.4. As for the part of the optimal design of machine: firstly, the mathematical model of the mechanical device of the treedozer has been established, spatial coordinates of the hinge points are regarded as design variables, the strength of the major links and cylinder stroke are regarded as constraint conditions, the stresses in the dangerous sections of the launching bridges and frame are regarded as object functions. Secondly, the optimal problem has been solved by means of GA optimization method.5. As for the part of the rigid-flexible coupling simulation: Through the comparative analysis of the main links’ simulation results before and after optimization, it is concluded that the stresses of the launching bridges and the frame after optimization are decreased, the stress values are respectively changed from 281 MPa, 273 MPa and 233 MPa to 277 MPa, 266 MPa and 179 MPa, which are respectively decreased by 1.4 percent, 2.5 percent and 23.1 percent. Meanwhile, the stresses of the main links after optimization are less than the materials’ yield limits, so the optimal results are effective.