Study On Method Of Performance Driving Design For Complex Mechanical Product And Typical Application

With the increase in complexity of modern mechanical product as represented by large-scale equipment, the design and development process is developing to intelligentized, high-efficiency and integrated, which put forward the new requirement and hopeness to the theory and method of product design. Therefore, more advanced modern design theory and method will be required to drive the wholl design process, and guide high-quality and high-efficiency design process as a whole. The research status at home and abroad and the product of software company has comprehensive reviewed for the correlative domains with this research, and carry out the research and exploration on the method of performance driving design for complex mechanical product. The key research contents were determined as follows through the present problems and future development trends.1. The general architecture of performance driving design method was put forward, and design elements, such as function, performance and quality, of complex mechanical product was analyzed respectively. And then, the core position of performance in the modern product design flow was discussed, and the definition of performance was studied from three aspects, such as requirement, feature and parameter. Finally, the index system and performance model was expounded in detail.2. Based on the technology of QFD and digital prototyping, the basic flow of performance driving design method was proposed. It is composed with the transverse design process which is driven by function requirement and focuses on function structural mapping, and the longitudinal analysis process which is driven by performance requirement makes performance simulation as the core. This flow describes the general architecture of performance driving design method in detail.3. The performance analysis component is used as the basic element of the performance driving design method flow was defined. The related basic flow and module was analysis systematically, and the elementary steps were studied intensively, such as establishment of the performance model, construction of analysis matrix, scheme determination, and so on. The key decision-making aided tools were proposed, such as performance analysis matrix and scheme selection matrix, which perfect the frame and flow of performance driving design method.4. According to the uncertainty, coupling and the transforming characteristics of performance driving design process, a series of key enabling technology was studied deeply. Firstly, the method of performance index weight determination based on the technology of QFD, rough set, and gray relation analysis, in order to pay attention to the subjective feeling of customs and the experience of experts. Secondly, the method of design alternatives definition combined with two coordinated strategies of multiple subsystems in MDO, digital experiment and sensitivity analysis technology so as to achieve the whole optimization of product performance was set up. Thirdly, final design scheme method composed of rough set and gray relation analysis was found, in order to consider quantitative index and qualitative index simultaneously. Finally, a feature mapping mechanism from performance feature, structural feature to process feature based on feature mapping theory was carried out to improve machining efficiency and accuracy.As a typical application example, the overall performance of bulb-tubular hydraulic generator which typically represents complex mechanical product has been conceptually proposed after analyzing its basic structural characteristics. The basic performance driving design flow of thrust bearing which is the key part in the hydraulic generator was firstly constructed, in order to realize the practical application of the method in hydraulic generator and its key parts design. It is successfully verification that the method of performance driving design in complex mechanical product development own practicability and technical feasibility. Furthermore, according to the problem of gear chamfering manufacturing performance calculation and analysis, the technical feasibility of this method was further verified from performance feature mapping.