Study On Product Design Planning And Visual Optimization Design Method Of Modern Machinery

Product design is the most important part during the product development process and the final quality of product is impacted directly by the effect of the design. The advanced and applied design theory or method has great stimulation on product design so that it is focused their attention by researchers and enterprisers. By cursory statistic, more than 60 kinds of design methods that are put forward by literates improve the design quality evidently at present. It is unpractical and unnecessary that all design methods are applied on a specific product design. Depending on summarizing design methods in existence, the synthesis deign method of modern machinery is brought. According to this method, product design planning, function optimization design, dynamic optimization design, intelligent optimization design, visual optimization design and design quality inspection are used during product design process, and then design quality can be insured and improved. It's so significative that the random and nonstandard character of selecting design methods can be avoided by applying the synthesis design method.At present, the general framework of synthesis design method has been studied well and some research results have been accepted by most researchers and enterprisers. However, under the theory framework, some design ideas, techniques and methods still need to be studied in-depth. In the paper, the product design planning and visual optimization design (VOD) are researched mainly and some techniques or methods about design planning and VOD are expected to achieve by the study. The works are supported by the Key Project of National Natural Science Foundation of China (No.50535010). The results of the research are important for enriching and developing, extending and applying the synthesis design method. And the main contents are as follows:The theory framework of synthesis deign method is continued to study and summarize in-depth. The generalized quality and generalized optimization are two important concepts for understanding and applying synthesis design method. According to design flow, the theoretical system of synthesis design method is divided into four parts:design planning, function optimization, technique design and inspection of design quality. Furthermore, establishing design platform is thought as a main measure of applying the method and the architecture of the design platform is put forward. The architecture is composed of four layers: interface layer, application layer, technology layer and environment layer. ABSTRACTOn the basis of summarizing and analyzing the relevant study of product design planning, the theory method of 3L/8D planning is proposed. According to this method, in order to ensure efficiency and success ratio of design, design stratagem layer, design operation layer and design inspection layer should be considered during the planning. Furthermore, the three layers can be divided into 8 sections, such as design environment, design ideas, design objective, design contents, design methods, design process, design problem and design quality assessment. In the paper, the work of design planning is researched roundly, decision-making model and particular method for every phase of design planning is also put forward and then elementary theory framework of 3L/8D design planning method is set up. Above-mentioned study can provide references for further researching design planning.Around relational theory of 3L/8D design planning, the exploiture of some compute assistant planning systems are comprised of the following parts:importance degree evaluation on customer demands, the fuzzy clustering analysis on customers, the design case search, the decomposition and correlative degree evaluation on design task, the design quality fuzzy evaluation. During the research, the functional modules, implement theory and process are discussed in detail. All the systems are provided with visual interfaces and can build reports automatically, so they can make researchers get decision-making information rapidly.The methods and implement measures of VOD are researched in the paper. By analyzing the characteristics of modern machinery design and summarizing the former achievements, the connotation, research contents, technical flow, key techniques, developing software and application rules of VOD are determined, and then the theory frame of methodology is set up. Furthermore, the particular segments of VOD namely assembly process, machining process, kinematics and dynamics state, working process, control process are also discussed and the theory, objective and method of these segments are researched detailedly.Based upon introducing the connotation of design platform, the strategy and technique of constructing VOD platform are researched mainly. The architecture and functional module are proposed during study. In the light of architecture, VOD platform can be divided into 4 layers, and it is technology operation layer, main functional layer, assistant functional layer and technical support layer respectively. Moreover, the VOD platform is made up of 10 functional modules, such as fast modeling system, machining process simulation system, assembly process simulation system, kinematics simulation system and so on. The strategy of constructing VOD platform is put forward and the strategy may be summarized as a policy, namely self-evaluation, pursuing benefits, effect the greatest economy and implement step by step. The general flow of constructing VOD platform is also proposed and the flow comprises of 6 key steps, namely scene investigation and research, demand analysis, establishing planning, actual development, function testing and coming into operation.Applied the VOD method, the 3-TPT parallel machine tool that is researched and made by northeastern university independently is studied. And around the machine tool, parametric design, assembly process visualization, kinematics visualization, dynamics visualization and working process visualization are researched. The practice indicates that applying the VOD method during product design is effective, and the method can promote product design quality evidently.