With the development of information technology, such as CAD, CAPP and CAM, assembly process, which accounts for large amount of time and cost of manufacturing, to be included in virtual manufacturing system is urgently required. According to the principle that the sequence and path in assembly and disassembly process are reversible, the assembly path can be obtained on the basis of assembly constraints analysis and information model building through optimized and reversed. The method of assembly path planning presented in this paper can effectively reduce computational complexity and improve planning efficiency, whose correctness and efficiency is proven by an application example.
In the human-computer environment of the production system , the safety and reliability of the production equipment is increasing gradually with the increase of automation level, so the influence of people on the production system is more significant. In this paper, in view of the production safety problems in the manufacturing field, this paper improves the human factor analysis and classification (HFACS) model with the ABC behavior analysis method, and divides the unsafe factors into the 4 types of causes, and the 19 factors. Taking the M enterprise in Suzhou as an example, the weight of each factor is calculated by analytic hierarchy process, and the safety of the production system is analyzed and evaluated with the theory of set pair analysis. Finally, the countermeasures are put forward.
On the basis of intensive study on the characteristics of structure and standards of wind turbine pitch bearing, the paper established the parameters level model of pitch bearing, analyzed the vague relationship between the size of pitch bearing and the capacity of wind turbine and determined the main design parameters of pitch bearing. Via combining open parametric method for part family and parameter-driven technology, this paper also developed a faster design support system of pitch bearing of wind turbine, which effectively cut down repetitive design work and improved the efficiency of design and the reliability of pitch bearing.
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