Study On Motorcycle Dynamic Design And Method Of Property Evaluation

Chinese manufacturing is on the bottom of the global manufacturing chain, because of lacking high-level resource for competition, such as technology, brand and etc. Although a lot of motorcycle made in China, comparing the performance of motorcycle made in china with those made in Japan, U.S, Europe, there has a biggish gap. Jointing venture and fetching in technology did not bring the ability to develop high performance motorcycle. The virtual product development is a technology that virtual product model be well used in process of new product design, and the product be conceived, designed, analyzed, manufactured and tested. It help designer to seek more innovative design. Using it, the innovation of corporation can be upgraded.This thesis is supported by'the reusable design theory and the method research based on integrated product model'- the National Natural Science Foundation (50375161),'the intelligent development technical research of motorcycle products'-Chongqing science and technology key project (7823-10), and'reducing vibration of VG200 engine'- Chongqing Zongshen group technology key project. The main contents of thesis are following.1) CAE do not exert influence because of the motorcycle design flow at present. A new motorcycle design flow based on virtual prototype is presented, in order to merge CAE in whole design process and integrate CAE with CAT. It is presented in this thesis that the hiberarchy and expression about a type of information integration motorcycle model based on configuration. A motorcycle model be generated, which contenting consumer, by designer configuring model.2) Dynamic design method has been applied in designing and analyzing frame and engine of motorcycle. The method of frame constitution based on structural model can help to form the motorcycle frame quickly and easily. The result of mode analysis can be used to plan mode test. On the other hand, the result of hammering mode test can take the role in validating mode analysis.3) Inertia force and moment of engine have been analyzed, and the method about balancing Inertia force and moment has been studied. Engine elastic hanging method is written up. Calculating and testing show that single shaft balancing effectively reduces inertia force and moment of engine, and show that engine elastic hanging availably decrease frame vibration arise by engine. 4) In order to quickly evaluate and optimize design, the template has been used to build motorcycle analyzing model. Suspension system has been established, and its running and force have been analyzed. It has been analyzed that motorcycle leap a slope. Used FEM model of ZS250GS motorcycle has been set up. Inherent frequency, vibration mode and syntonic response of the motorcycle have been analyzed. The result of testing vibration is consistent with the result of syntonic response.5) Evaluating comfort performance of motorcycle has three ways, CAE, human body sense and testing data. Those ways are all discussed. It has been studied to that fuzzy absolute human body sense and fuzzy comparative human body sense. An especial way is presented, which quickly evaluates comfort performance of motorcycle. The way is test-driving and fuzzy human body sense. a new testing data way to evaluate comfort performance has been constituted. It synthesizes several national standards and considers motorcycle characteristic. Those ways have been used in evaluating comfort performance of ZS250GS motorcycle.