Fuzzy identification method for weak vibration of woodworking machine tools
Liu Cheng, Chen Jian, Huajun Northeast Forestry University, Heilongjiang Harbin 150040, the fuzzy operation model under the principle of discrimination. On the basis of the fuzzy comprehensive discriminant model, the comprehensive analysis of different levels and different side discriminants is discussed. 1 The introduction of the dynamic performance of woodworking machine tools began at the end of the 19th century and has a history of more than 100 years. However, for the dynamic performance of woodworking machine tools, Germany, France, Canada, the former Soviet Union and other countries with more developed science and technology, they have done a lot of theoretical exploration on the dynamic performance of woodworking machine tools such as woodworking band saw machine woodworking circular saw machine woodworking planer woodworking planer. Set experimental research. Relevant scholars and engineers in China have also been engaged in research work in this area in the 1980s. In the current research, for the identification of the weak links of commonly used woodworking machine tools, there are already rich monitoring methods and the acceptance method of 200105. The application of these methods provides multi-faceted information for the determination of weak links in woodworking machines. This information is sometimes mutually supportive, but it is also contradictory. How to effectively analyze this information comprehensively and improve the accuracy of the judgment is a major question we face. The usual practice is to select one or more of the most likely discriminant results as the final conclusion, and on this basis, propose an improved design. However, this method artificially discards some useful information, which is not completely reasonable and comprehensive, and it is difficult to resolve mutual support and contradictory conclusions. Therefore, we need to find a way to comprehensively judge the weak links, which will lay a theoretical foundation for the dynamic design of woodworking machine tools in the future. Fund Project Harbin Youth Science Fund Project 992188 Research and Design 2 Woodworking Machine Weak Link Discriminant Model and Algorithm 2.1 Woodworking Machine Weak Link Discrimination Chess Woodworking Machine Tool Weak Links are divided into two levels. The first layer is to use some method or some Class information is used to determine the weak point of the woodworking machine tool, such as using the power spectrum of the vibration signal for discrimination, etc., which is the basic unit 8351; 8. The first layer is at 81; then comprehensive discrimination, that is, comprehensive analysis The above parallel or complementary discriminant theory and information determine the weak link in the true sense. It is the comprehensive discriminating unit 5 813318; Shi 3,10. These two levels are different and closely related, and their structural principles 1. From the model It is not difficult to see that its basic unit 81 is the basis of the model, which determines the weak link of the woodworking machine tool by one or more indicators. And 30. is to use a variety of factors to comprehensively determine the weak link of woodworking machine tools, in the form of a tree structure. For the multi-index discriminant model, the sub-sets of each index are set to the weight coefficient vector corresponding to each index. At the same time, the state set of the sub-structure corresponding to index 4 is C,=cn, ci2, ciMj, then the evaluation matrix is , bM where, 1 is. The fuzzy discrimination result of each substructure of the object is discriminated, and the enlargement and subtraction operations in the calculation are performed as follows. It is not difficult to see from the above formula that the calculation is 1; the core content of the comprehensive judgment of multiple indicators, but to calculate more accurately, it is necessary to progress to study the following content, the combination strategy of the calculation of the square, that is, the fuzzy operation model; scientifically and reasonably The method of 2.2 fuzzy computing model often requires different principles in the identification of weak links in woodworking machine tools. In actual work, it is often carried out dynamically according to the degree of influence of various factors. The following models are commonly used in the above formula. 1 The weighted average type considers all aspects in a comprehensive way, and calculates the product and the main factor prominent type. Considering the key factors, first take the small and then take the big focus to consider the key factors, take the maximum product or the minimum sum, consider it comprehensively, and take into account the key factors. 2.2.2 The method of generating the weight coefficient The selection of the weight coefficient is currently in use. . Since the large and small operations in the discriminant model are relatively rough, the selection of the weight coefficients can be achieved only by basically reasonable. For the synthesis of expert groups composed of experts, the weighted average can be performed according to the authority of different experts, that is, 2.2.3 Discriminant fuzzy matrix generation method is used to discriminate the fuzzy matrix from the single factor evaluation, general statistics and Analytical calculation method implementation. It can be used for research and design 3 application examples in the study of the vibration characteristics of the elbow, 512 vertical single-axis woodworking milling machine. The above method identifies the weak links and achieves better results. Now introduce its comprehensive identification process. 3.1 Discriminating scheme River, 52 machine tools are mainly composed of the bed fixed table spindle and its adjustment mechanism spindle transmission guide movable table and workpiece clamping device. Among them, the fixed spindle table and the movable workbench have the most direct influence on the precision of the workpiece. Therefore, the selected object set is the movable table of the fixed table of the bed spindle. The method set is the energy method and the vibration mode. law. 3.2BU discrimination 0.568, 0.385, 0.322 From the results, it summarizes the characteristics of various aspects. Among them, the vibration of the main shaft is the most serious, and the impact on the machining accuracy is also the greatest, which should be regarded as the weak link of the machine tool. On this basis, the support frame is added to the cutter shaft while the design is improved, the bearing spacing is increased, and the vibration is effectively reduced. 4 Conclusion The weak link recognition model is proposed, and the fuzzy recognition method of weak links is proposed. This method considers the difference in the degree of influence of different factors on the precision of the machined workpiece during work, and proposes a weight coefficient generation method to make the judgment more reliable, which lays a theoretical foundation for the dynamic design of woodworking machine tools in the future. 52 machine tool spindle speed is adjustable in six stages, respectively, and the index set by Heyang is the energy at the spindle-level rotation frequency. The energy at the spindle-spindle frequency is the energy at the spindle-spindle frequency. The energy at the six-level rotational frequency of the energy principal at the level of rotational frequency. At the same time, according to the application of the speed of each stage in the actual work, the discriminant result obtained by the weight coefficient 1 according to the deformation condition is 33 fuzzy, and the discriminant for the above two weak link identification methods, according to the empirically, the weight coefficient is 0.4, 0.6. Then, the fuzzy comprehensive discrimination result is a reference 1 strong. , Research on the vibration characteristics of 12 woodworking milling machines. Northeast Forestry University Master ± Dissertation, 998, Huang Yufu, Wang Jiading. Fuzzy information analysis and application M. Beijing Normal University published 3 main inscriptions. Fuzzy math lectures. Northeast Normal University Press, 1988. Han Liyan, Wang Peizhuang. Applied Fuzzy Mathematics 1. Capital Economics and Trade University Press, Wang Guocai, Hua Jun. Wood products processing machine. Northeast Forestry University Press, 1995. Transfer the live-action equipment, such as a mobile applicator. Double-sided woodworking presser 6, while wide, produced in Shanghai in 1992. Multi-piece silver table 4, Mudanjiang Woodworking Machinery Factory was produced in 1994. Face planing floor machine 402 Mudanjiang Woodworking Machinery Factory 1993, in addition to the small flat planing 300mm pressure planer and other machinery transfer. Contact Chu Xiaoxia (Finish) Light-burned magnesium oxide, also called [reactive magnesia", is one of the most widely used industrial compounds that finds plenty of applications in environmental protection and the production of various pharmaceuticals, fertilizers, polymers as well as construction materials. 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