Virtual Design Method Research On The Simulation And Analysis For The Subsystems Of I.C.Engine

To keep a perspective upon the Modern Design Methodology, this dissertation startswith the history of Design, and then conducts a comprehensive introduction andanalysis aimed at the current situation and future of the Virtual Design in engineering.Furthermore, in a step-by-step order – Modeling, Kinematics Analysis, OptimalDesign, Dynamics Analysis – the application of these connotations in I.C.engine fieldhas been introduced this dissertation.Initiatively, this dissertation puts forward a new conception – Feature Solution; andpredicts that the template design would be the tendency of the virtual design; anddeduces an Optimizing Design Method (ODM) based on the Virtual Design Technique(VDT); and concludes a more comprehensive definition of Virtual Prototype; anddevelops the previous elasto-dynamics model of valve mechanism.Firstly, the new conception of Feature Solution is aimed at developing a high effectivepattern to guide the virtual process in designing those topologically complexstructures. Moreover, this dissertation sets down a suit of Feature Solution for 3D portmodels of an engine intake system of variable swirl ratio. With this solution, theoverall port design process can be conducted in a virtual pattern. To evaluate theadvantages of the new pattern, a CFD analysis is concerned.Secondly, the social problems in generalizing the Virtual Design has been described inthis dissertation, and then it makes out a prediction that the Template Design would bethe tendency of the virtual design. Regarding this prediction and applying theODM-VDT, an optimal template of cam shape line (OTCSL) has been invented bythis dissertation; this is benefited from the combination the idea of Template Designwith the Feature-Parameter Technique and Behavioral Modeling Technique. By meansof this template, an optimal calculation of application has been conducted on a doubleOver-Head Cam (OHC) mechanism. Moreover, a multi-body dynamics analysis isproposed in this dissertation. Furthermore, in the course of dynamics analysis, theprevious dynamics model of OHC mechanism has been developed to a great extent.Thirdly, in a given chapter, the conceptions, the technique elements and theadvantages to the traditional pattern, which are concerned with the ODM-VDT, hasbeen introduced. Moreover, taking the OTCSL as an example, this new pattern hasbeen realized in the dissertation. And by introducing the crankshaft Dynamic-StaticBalance theory and the Light-duty Design theory into the Feature-ParameterTechnique and Behavioral Modeling Technique, an optimizing process has beenconducted upon crankshaft balance weight, and a perfect effect has been achieved.Fourthly, by using the result from the optimal calculation, two virtual prototypes ofvalve mechanism and camshaft mechanism are built up for a given engine in thedissertation. By comparison with the results from the physical prototypes, thesimulation indicates that the virtual prototypes in this book exactly improve thedynamic simulation effect of valve and camshaft mechanism to a great extent, and thenew virtual prototypes possess a creditable predictive ability for the engine valvemechanism performances.In addition, the conceptions, missions and importance of the Kinematics Simulationbased on VDT, have been introduced in one chapter of this dissertation. Moreover,taking a double OHC mechanism and a crankguide mechanism as objects, thisdissertation carries out a practice on Virtual Assembly Process design and KinematicsSimulation for the shell part design.