Study And Application On Key Theory Of Modern Product Design Planning

To improve the product quality, many researchers have done plenty of research work about the product design, and presented many new design theory and method. But these methods were only suitable for the certain product or for the certain development stages. The method which could cover the whole development period was inexistence. Many problems and deficiencies need to be studied continually about design theory and method. At the same time, the focus and difficulty problem was how to use such many methods in the design process and how to realize organic combination and match the different methods.Based on many years design experience Professor Wen Bangchun has presented theory design planning faced the product generalized quality from the system engineering viewpoint. That is to say, the design process was planned from design ideas, design environments, design steps, design objects, design contents, design methods and design quality evaluation.7D design planning overcame the malady of the traditional design. Based on computer aided design and knowledge of multidisciplinary 7D design planning grasped the global design.Main contents of product design planning were evolved. The key problems of modern product design planning were studied, which included product requirement, product function optimization design, product characteristics optimization design and quality evaluation. Finally the design planning was succeeded in rotor test design. This works was financed by the Key Project of China National Natural Science Foundation (No.50535010), and supported by Shenyang Key laboratory of Mechanical Vibration and Dynamic Design of product, and the State Technology Center of Shenyang Blower (Group) Ltd.Corp. The research results are important for enriching and developing, extending and applying design planning theory. And the main contents are as follows:The present research status was summarized about design theory and method and the main methods were classified. The key problems in design theory and method were discussed at present. The importance and necessity of scientific development viewpoint and self-creation was emphasized in the process of product design. The background of topic selection and study significance were elucidated. The basis theory and main contents of modern product design planning were studied. The basis theory mainly included product quality equation, technology system integrity and relation equation of object, content and method. The main contents included design ideas, design environments, design steps, design objects, design contents, design methods and design quality assessment. Modem product design planning was divided into three stage: planning stage, implement stage and assessment stage. Modern product design planning was suitable for not only general mechanical equipment but also large rotating machinery, large transportation equipment, and large engineering machinery et al.The product requirement was analyzed and forecasted from the technology evolution and the market investigation. For the new product development the new science principle and technology breakthrough were sought from the technology evolution. For the product improvement the target market was classified and the direction of the product improvement was determined from the market investigation. The personal product suitable for different customer was supplied. According to the requirement analysis and forecast the market demand could be created.Relation equation of object, content and method about function optimization design was proposed. The product function was embodied in the design scheme. With the grey theory the function design scheme could be evaluated and the index sensitive range could be analyzed. A case about function design scheme of vibration screen was studied. Function optimization design was important content of modern product design planning.The product characteristics mainly included structural characteristics, operational characteristics and manufacturing characteristics. Each characteristics were separately made up of 8 sub-characteristics. The characteristics optimization design included dynamic optimization design, intelligent optimization design and visual optimization design. With the characteristics optimization design the structural characteristics, operational characteristics and manufacturing characteristics of product could be ensured.Based on the product design quality the indexes system of the quality evaluation was established. Combined with the general process of quality evaluation from different viewpoint the design quality was evaluated with the different method, which included fuzzy synthesis evaluation method, grey hierarchy method and combination weight evaluation method. In the practical evaluation process the different evaluation method was selected according to the different indexes.Modern product design planning was applied in the large compressor rotor vibration test system. The design process was deployed according to the design general planning. The design scheme was established with the function optimization design. The detailed design was obtained with dynamic optimization design, intelligent optimization design and visual optimization design. The main function, structural characteristics, operational characteristics, manufacturing characteristics could be ensured.