Existing product family models are redundancy,low efficient to manage and hard to update.So,a new approach for the knowledge representation of product family model based on constrained object is proposed.The approach minimizes the data redundancy of product structure and complexity of product configuration,and facilitates the model renewal through effective encapsulation of model knowledge.Hence then,the configuration approach based on constrains and the case are stuided,and the concrete reasoning process of configuration is given.Finally,an example of modeling a motorcycle product family is introduced.The model and its reasoning approachcan be easily realized by computer,and also can be used to develop an effective product family configuration system.
ETO product was mostly complicated product, and it was designed on the basis of especial customer requirement. The framework of ETO product configuration design and multidisciplinary optimization was put forward, through analyzing key problem of ETO configuration design; based on design knowledge and tabular layouts of article characteristics, designer could fleetly configure ETO product in accord with customer requirement, which could increased reuse of parts; through optimizing result of configuration design, designer could improve choice of parts and reduce iteration in design process. A numerical control figuration grinder product example was given to verify the feasibility of principle.
Summary ::: Although depression has been associated to worst bone physical properties in adulthood, this study showed that depressive symptoms were not significantly associated to bone mineral density measured at the forearm during adolescence.