Simulation Research On Scarification Device Of Crawler Bulldozer

Crawler bulldozer has been a kind of important engineering machinery in modern engineering construction,and the work scope as well as the efficiency of bulldozers will be greatly improved with the application of scarification device.However,the traditional design mainly satisfied the static characteristics of scarification device,lacking a in-depth study of the dynamic characteristics.Based on the finite element analysis and dynamic simulation technology of virtual prototyping,a structural strength analysis to the scarification device,using ANSYS Workbench,was made in the first part of the thesis,and on the basis of the analysis,the stress and deformation of the device were caught and then the design of device was improved.Built a virtual prototype model of the scarification device in ADAMS software,and then made a simulation of kinematics and dynamics of the device,moreover,mechanical system and hydraulic system joint simulation was conducted in ADAMS/Hydraulics module,as a result,dynamic characteristics and parameters change of the scarification device in the course of its work were grasped.These results can be used to improve the design of the scarification device.In the thesis,the key researches are as follows:1.Rigid body modeling of scarification deviceThe study was mainly about the multi-tooth scarifier equipped on a bulldozer.Using Pro/E software,modeled each component of the scarification device and then assembled them together.2.Establishment and analysis of the finite element model of the scarification deviceSeamless connection existed between Pro/E and ANSYS Workbench could allow there-dimensional model of the scarifier to be imported into ANSYS Workbench,and then the model would be amended or simplified in a certain extent.In order to determine whether the device met the requirements of structural strength and which parts were on the edge of danger,finite element analyses in three different working conditions of the scarifier were made.Then,scarifier was mended according to the results and its modal analysis was figured out later.3.Kinematics and dynamics simulation analysis of the scarification deviceImported the three-dimensional model of scarifier to ADAMS,added constraints and the drive to establish a virtual prototype model of the device.Through the kinematics and dynamics analysis,the limits of working position,the stress curves of the hydraulic cylinders and the hinge points during the work process were obtained,which would be a basis for the improvement of scarifier.4.Hydraulics-mechanical coupling modeling of scarification device and simulation analysisDesigned hydraulic drive circuit of the scarifier and built its virtual prototype model in ADAMS/Hydraulics module,the stress curves,the length curves and the velocity curves of hydraulic cylinders would be known,and that would provide a basis for the improvement of the hydraulic system.