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Aim at the problem that the variation of constraint leads to variation of assembly sequence, this paper presents a method based on the gray theory associated with genetic algorithm (GA). The variation of constraint on assembly site for complex products includes absence of parts, fixtures, resource and so on. Firstly, a seven-cell coding format is built based on multiple genes. The fitness function...
University examination timetabling problem is a complicated, multi-constraint combinatorial optimization problem. The current grouping genetic algorithm could get a better optimistic solution. Although the block encoding technique was applied in, the probabilities of crossover and mutation operation were still based on simple genetic algorithm. So the universality of this algorithm is not very well...
By applying CAN (controller area network) bus , a new type of LAN (local area network) embedded NC system based on ARM9 and motion control chip MCX314As is designed. Through CAN controller MCP2515 and CAN receiver MCP2551 , the LAN NC system is established. In the paper, the function of network system and the architecture of embedded NC system are described in detail. And a hardware platform of embedded...
To support the decision-making on coordination process for aviation projects, a multi-project priority assessing method based on fuzzy comprehensive evaluation is presented. A bi-layered hierarchy model is introduced to determine the set of factors for priority assessment at first. Then the weight of each involved factor is calculated through analytic hierarchy process (AHP), which merges human experts'...
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