Integrated Modeling Method Of Assembly And Dynamic Model For Complex Product Based On Topology Pre-Mapping And Array Self-Positioning And Its Application

Since the 1960 s,multi-body dynamic simulation has been widely used in the design and performance analysis of complex products in machinery,aerospace and other fields.The modeling of dynamic models is the premise and one of the key techniques to analyzing the dynamic performance of complex products.At present,the modeling of dynamic models is mainly done by the built-in modeling functions of dynamic analysis software,or based on the cooperation of two heterogeneous platforms—CAD software and dynamic analysis software.The former can only be used for simple products,while the latter has problems such as data loss and tedious operation of building kinematic and dynamic constraints during the modeling process,which reduce the efficiency of dynamic modeling and modification.In order to solve the above problems and improve the efficiency of dynamic modeling of complex products,this paper proposes an integrated modeling method of assembly model and dynamic model for complex product based on topology pre-mapping and array self-positioning,and applies this method to build multi-body dynamic model of array products,realizing the rapid modeling and modification of dynamic models.The first chapter introduces the research background and significance,summarizes the modeling methods of assembly model,the methods of data configuration and rapid building of kinematic and dynamic constraints in the process of dynamic modeling,and the methods of batch assembly and dynamic modeling of array elements in array products,and puts forward the research content and organization framework of this paper.In the second chapter,the expression method of topology structure for dynamic model of product based on the augmented multi-body dynamical constraints is proposed.In this chapter,the concept of augmented multi-body dynamical constraint(AMC)is proposed,and the topology relation graph for dynamic model of product is established by AMC,which realizes the integrated expression of dynamical constraint relationship and assembly relationship of dynamic model and lays a foundation for the integrated modeling of assembly model and dynamic model.In the third chapter,a modularized configuration method of part's attribute data for dynamic model driven by relation table is researched.Based on the database,the attribute data of part is saved.The configuration model is established through the relation schema of each table,which realize modular configuration of part's data.This method improves the efficiency of configuration and reconstruction of part's attribute data.In the fourth chapter,the method of constraint building and part assembly for dynamic model based on topology pre-mapping is researched.Based on the idea that constraints are embodied in data of part,the concept of topology pre-mapping is proposed and implemented by setting topology pre-mapping points on parts.Then,method to build kinematic and dynamic constraints between parts based on topology pre-mapping points,and method to assemble parts through coordinate transformation of topology pre-mapping points are proposed,which embodies the features of integrated modeling of assembly model and dynamic model.In the fifth chapter,a self-adaptive assembly method for the parts of product which has fillet polygon array is proposed.Aiming at the fillet polygon array such as chain and track,the method of solving geometric parameters of assembly referencing line of fillet polygon array and the method of part assembly based on the distribution features of array are proposed to realize the massive assembly of array elements.The dynamic modeling efficiency of the array parts can be improved by traversing the array elements to build kinematic and dynamic constraints.In the sixth chapter,a software of multi-body dynamic modeling for tracked vehicle is developed and is applied to build a case model.Aiming at the typical array-type complex product of tracked vehicle,the software is developed based on QT 5 GUI library,SQLite database engine and C++ programming language,which realizes the method discussed from chapter 2 to 5.The integrated modeling of the dynamic model of tracked vehicle action system is realized by this software.The correctness and feasibility of the method proposed in this paper are verified by specific simulation examples and dynamic model modification examples.The seventh chapter summarize the full paper,and puts forward the prospect for the follow-up research work.