Study On Dynamics Modeling Of Vehicle Integrated Transmission Based On Virtual Assembly

The integrated transmission is an important component of military armored vehicle,which can realize the variable speed, steering, braking and other functions. The study onvirtual assembly is one important part for the design analysis of the integrated transmission.The current study focuses on the the simulation of virtual assembly process. The relevantresearch of the dynamics modeling based on the virtual assembly is less. The dynamicsmodeling and virtual assembly is effectively integrated in the paper. In this paper, therelevant theories, key technologies and realization methods of dynamics modeling based onvirtual assembly for vehicle integrated transmission are performed a systematic study. Themain study contents include the following aspects:The function characteristics and the realization modes of dynamics modeling based onvirtual assembly for integrated transmission are analyzed. On this basis, the systemarchitecture and analysis process of dynamics modeling system for the dynamics modelingbased on virtual assembly for integrated transmission are proposed. According to thearchitecture, the system is divided into the human-computer interaction, functionalimplementation, core analysis and data supporting layer, and the complete systemarchitecture is established. The dynamics modeling process is divided into the modeling ofmulti-attribute parts, system modeling based on assembly features, dynamics modeling andsystem implementation stage from the analysis process.According to the demands for the attribute information of dynamics modeling basedon the virtual assembly, the modeling method for multi-attribute parts for the dynamicsmodeling based on virtual assembly is put forward. The characterization of informationdata structure of multi-attribute parts is carried out by the establishement of a multi-hierarchieal relational characterization model. The information extraction and conversionof design model, model database technology, application of intermediate files, the buildingof physical attributes, behaviors and the engineering information are applied to realize themodeling for the multiple attribute parts of integrated vehicle in the virtual environment.The modeling provides the data base for the system modeling based on assembly featuresand dynamic simulation analysis based on the virtual assembly model. Based on the model of multiple attribute parts, integrated transmission modeling basedon assembly features is studied. The modeling method based on the assembly features forthe transmission in the virtual enviroment is proposed on the basis of the analysis for thecharacteristics of assembly features modeling. The features modeling for the transmissionin the virtual enviroment is established by the collision detection based on the assemblyfeatures, characterization and identification of assembly features constraints, solving foraccurate positioning of parts.The establishment of assembly features model of transmissionprovides the analysis of foundation for the dynamics modeling based on the virtualassembly model.The transmission system dynamics modeling method based on the virtual assemblyand simulation techniques in the virtual environment is researched on the basis of thetheory of multi-body system dynamics. The dynamics modeling method based on virtualassembly is put forward. By the the identifying based on the assembly features constrainsof kinematic pairs, the modeling of constrains, the establishment of kinematic pairs, thebuilding of contact constraints, analysis of redundant constraint, the dynamics model basedon the virtual assembly is established in the virtual environment. The solving for thedynamics modeling based on the theory of linear complementarity problem and thedynamics real time simulation of typical system of transmission are impletmented.On the basis of study achievements, an integrated modeling system namedVTDM-VA is desgned and developed according to the functional requirements ofdynamics modeling of vehicle integrated transmission based on the virtual assembly. Thesystem function model and function modules of subsystems are established on the basis ofanalysis of system functions. The logical structure and developping and runningenvironment environment of system are detailed analyzed. The example verification iscarried out to verify the system functions.