Reusable design for crane bridges using modular templates
To transfer the previous design concepts and experiences to current product design,the design reuse is applied for rapid product design.By combining existing design options and modularized features for crane bridge design,the reasonable reuse of design knowledge can accordingly improve the design efficiency.In this study,the modular template modeling is proposed via design reuse.In this way,the bridge structure is decomposed into several independent modules,each contains the major even entire design information and possesses openness.So far,the crane bridge module base is established based on the modular template base.To this end,the highly-efficient and harmonious design reuse will be conducted on design module and system development.
Abstract This paper investigates a drayage problem, where a fleet of trucks must ship container loads from a port to importers and from exporters to the same port, without separating trucks and containers during customer service. We present three formulations for this problem that are valid when each truck carries one container. For the third formulation, we also assume that the arc costs are equal for all trucks, and then we prove that its continuous relaxation admits integer optimal solutions by checking that its constraint matrix is totally unimodular. Under the same hypothesis on costs, even the continuous relaxations of the first two models are proved to admit an integer optimal solution. Finally, the third model is transformed into a circulation problem, that can be solved by efficient network algorithms.