Key Technologies Of Fuzzy Reconfigurable Design And Application In The Bogie

The bogie is one of the most important components of rolling stock, which is a typical and complicated mechanical system, not only takes charge of moving, guiding, supporting, damping, but also is the final executor of traction and brake. The design has the characteristics of fuzziness, coupling and recursive, etc. The current design methods mainly aim at local improvement and optimization for the existing problems of the bogie, and there are few innovative design theories and methods of the bogie structure. At the same time, the high efficiency of modern society has the same impact on product development and design. In the increasingly fierce market competition, how to make full use of existing resources to achieve the rapid reconfiguration design of the product is the focus of the study of complex mechanical products. To solve the two issues, this paper deals with the research of fuzzy reconfigurable design theory and methods, and its application in the train bogie, combined with the reality of domestic bogie design on the basis of the latest research results of rapid innovation design theory.1. As one of the key manufacturing technologies in the21st century, reconfigurable design is able to solve the design problem of the inheritance and innovation compared with other design methods, but its design theory is based on independent axiomatic design theory, and is still difficult to support complex product reconfiguration design. In this paper, On the basis of the detailed discussion of traditional reconfigurable theory and its design method, fuzzy reconfigurable design theory and method are put forward. The paper analyzes the fuzziness of the design input, fuzziness of relationship between design domains and fuzziness of the design solution procedure, proposes the fuzzy definition of the reconfigurable design and fuzzy reconfigurable theorem, and proves the reconfiguration of complex mechanical product design. Fuzzy reconfigurable design methodology is put forward as the design method of traditional reconfigurable design-the Analytic hierarchy process and the "z" word mapping method-are inefficient and risky in complex mechanical products. The original design domain is refined, that is, the performance domain is put forward, and the original physical domain is divided into structure domain and parameter domain. Then the design domains and their mapping are described by use of fuzzy numbers and the reconfiguration of the product is achieved by fuzzy matrix changes, fuzzy similarity identification and re-designs.2. The fuzzy set theory and its methods of fuzzy reconfigurable design are discussed. The paper introduces the definition of fuzzy sets and the concept ofλ-cut sets, and gives the common membership function of the design parameters in the mechanical product design. Also, it discusses in detail the weighted closeness degree fuzzy recognition method based on multiple parameters, and its application to the fuzzy choice of the components of fuzzy reconfigurable design. The mechanical structure of the fuzzy optimization method is discussed; the allowable stress for the fuzzy constraints and the minimum quality of the bogie frame for the optimization objectives, the frame is optimized with Hypermesh OptiStruct tools.3. The analysis method of product reconfiguration design matrix based on the House of Quality (HOQ) and its application in the overall design of the bogie are studied. The building process of structure analysis tools (HOQ) and the method of the associated matrix and its coupling analysis are discussed. Take bogie design as an example, the "function-structure" mapping matrix of the bogie is built, and its reconfigurability is analyzed. On this basis, the "performance-parameters" correlation matrix of the bogie is constructed, and the main design parameters and their important degree of sorting are given, which provides the theoretical guidance for the target design parameters, and at the same time provides the basis for fuzzy identification of the components.4. For the complex of bogie frame structure, the generalized modular design method and the performance simulation of frame are studied. Combine the characteristics of the welded frame, a generalized module defines and its function expression is given, structural characteristics and classification method of parameterized modules, flexible modules and virtual modules are analyzed, and the generalized modular reconfigurable design method is discussed. Taken the frame of bogie design as an example, and achieves generalized modular design of the frame, and the automation of performance simulation.5. The key technologies of fuzzy reconfigurable design system (BFRDS) are studied to achieve its system development. The key technologies of reconfigurable design system include product data model, configuration design and automated assembly technology, etc. According to the complexity of the complex mechanical product performance, the co-simulation technology based on multi-software is put forward. On these bases, the structural features and the design process of high-speed train bogie are discussed in detail, the structure system of the bogie fuzzy reconfigurable design is built, the system function modules and reconfigurable design process are given, and the software of the design system are developed.In summary, to solve complex mechanical product reconfigurable design issues, based on the traditional reconfigurable design, concurrent engineering and digital prototyping technology, fuzzy reconfigurable theory and methods are studied, and the design inheritance and innovation of bogie are explored with the typical application of the bogie. The fuzzy reconfigurable design system achieves the bogie fuzzy reconfiguration design and the integration management of product data, which provides an important means and a software platform for the bogie rapid design and reuse of resources.