Flowshop production is adopted as the major type of production of reinforced precast concrete components and it has higher requirements on shop floor schedules than other types, especially that from rescheduling. However, up to now, very few approach for the optimization of the shop floor rescheduling has been proposed in spite of its vital importance. This research proposes an approach for optimizing shop floor rescheduling of multiple production lines for flowshop production of reinforced precast concrete components. The approach comprehensively utilizes the over-assigned time, which is the difference value between the assigned production time and the estimated one of a production step for a precast component to deal with production emergencies. Meanwhile, it keeps the adjustment of schedules at minimum to avoid massive material re-dispatch. First of all, the optimization objectives and constraints of optimized shop floor rescheduling of multiple production lines for flowshop precast production are analyzed and a mathematic model is thus formulated. Then, the solver of the model is established by using genetic algorithm. Finally, the approach is validated by case studies. It is concluded that the approach contributes to the effective and efficient optimized rescheduling of multiple production lines for flowshop precast production.
Lightweight and crashworthiness are two crucial aspects of automobile design. The purpose of this study is to minimize the weight of the B-pillar without compromising the safety performance for the car occupants in side collisions and roof crush. For the purpose a finite element model was developed for modeling of a passenger car in side collision and roof crush. The optimization of the B-pillar was carried out by using tailor rolled blanks (TRB) concept under the constraint of vehicle side impact and roof crush. An integrated approach is applied using uniform design, finite element method, Kriging approximation and genetic algorithm. The B-pillar intrusion, intrusion velocity and the resistant force of roof crush were defined as constraint for determination of the thickness of the B-pillar. Finally, two types of structure TRB and TRB are proposed for lightweight design. The results indicated that the weight of the B-pillar can be reduced by 36.43% and 31.57% respectively, while fulfilling the safety requirements.
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