Research On Principle Schemes Verification And Optimization In Conceptual Design Of Multidisciplinary Products

The principle schemes generated in the conceptual design are the guiding basis for structural parameter design,manufacturing process selection and reliability analysis of products in the detailed design.However,the principle schemes are only a rough expression of design.Whether they can meet the design requirements often needs quantitative verification to judge in the detailed design stage.If the principle schemes are unreasonable,repeated design is required resulting in low design efficiency and high design cost.Therefore,this paper proposes a principle schemes verification and optimization method for products in conceptual design.In the concept design,considering the multidisciplinary and multi-energy domain coupling characteristics of the structure in products,the principle schemes are quantitatively verified and optimized to provide reasonable optimal principle scheme for detailed design.It improves the design efficiency and success rate.The main research work is as follows:(1)Based on bond graph theory,the unified modeling and expression method of multidisciplinary principle schemes is studied.The characteristic expression and mapping relationship of structure,function and effect are analyzed comprehensively.The functional structure model and effect model of principle schemes are established.Then the bond graph model is constructed by using the mixed mapping relationship of function,effect and bond graph element.(2)Quantitative simulation and validation of principle schemes bond graph model are realized.According to the bond graph model,the state equation is deduced and the AMESim simulation model is established.Then,the state variables and their parameters of the system are obtained as input information for the simulation.Finally,the functional feasibility and performance of the schemes are analyzed.(3)Combining quantitative simulation and qualitative judgment to optimize and evaluate the principle scheme.Capturing the design intentions of existing scheme to seek more innovative schemes.The feasible schemes are selected by verification.Then,using AMESim simulation and expert judgment results to evaluate and analyze feasible schemes respectively and obtain evaluation data.The rank of multiple feasible schemes are realized and the principle scheme of comprehensive performance optimum are determined by using VIKOR method.(4)The AMESim system component model development and component library expansion work were carried out.The design knowledge involved in the existing multidisciplinary environment was extended into the system component library in the form of component model.The knowledge was collected,classified and reused.The shearer was taken as an example to verify the effectiveness of system.The expanded component model was used to support the modeling and verification of the shearer principle schemes.