We consider a combined fleet deployment and inventory management problem in Roll-on Roll-off shipping. Along given trade routes there are ports with inventories that should be kept within their limits. Current planning practice is to visit all ports every time a trade route is serviced. We instead aim at determining the sailing routes of each voyage along the trade route, where some ports can be skipped on certain voyages. A novel mixed integer programming model is proposed and tested on realistic instances. The results indicate that substantial gains can be achieved from this more flexible way of planning.

中文翻译：

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结合海上舰队部署和库存管理以及滚装运输中的港口参观灵活性

我们在滚装运输中考虑了机队部署和库存管理的综合问题。沿着给定的贸易路线，港口的库存应保持在其限制范围内。当前的计划做法是每次服务贸易路线时都要拜访所有港口。相反，我们的目标是确定沿贸易路线的每次航行的航行路线，在某些航行中可以跳过某些港口。提出了一种新颖的混合整数规划模型，并在实际实例上进行了测试。结果表明，通过这种更灵活的计划方式可以取得可观的收益。