This paper presents a bidirectional load planning procedure for job-shops with availability time-windows for specific machines. This heuristic procedure uses priority rules and reverse planning directions to progressively construct two schedules: one for machines with availability constraints (the bottlenecks) and upstream, and other for bottlenecks downstream. Bottlenecks schedule is driving the schedule for all other non-bottleneck machines. Makespan reduction for aggregate schedule is finally performed if possible, by left shifting scheduled operations to their earliest start times.
Abstract. Plastic deformation of materials is accompanied by elastic deformation. After the bending process, the elastic deformation disappears and the part is changing its dimensions comparing with those of the tool. The change of bent part's dimensions due to the elastic properties of material is called elastic springback. It influences the precision of bent parts, especially the bending angle, and this is why its value should be known in order to take the necessary measures in order to reduce or even annihilate its effects. Its value can be determined with analytical relations, from various nomograms or with experimental relations. Because the analytical relations offer results far from reality, this paper proposes a multivariable relation of springback (dependent variable) as a function of several independent variables obtained on the basis of experimental results, in real working conditions and using the method of regression functions. This method is based on simultaneous variation of considered variables, using a limited number of values in the experimentation domain. A split experimental program was used. The obtained relation is true for any combination of values for considered variables, but, from their variation domains, it can be obtained separately the effects of independent variables on dependent variables.
The product development team has the task, amongst many others, to conceive the product's industrial design. Because it was proven and acknowledged that product's industrial design plays an important role in its success in the marketplace, the proposed design has to be evaluated based on an objective method. S.R. Ellis has proposed a method with seven criteria. The method was used by some researchers, but it has never been properly evaluated by an independent party. This paper presents the results of a scientific experiment aimed to test Ellis' method.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.