双深位多层穿梭车系统出库作业建模与优化

发布时间：2018-06-16 00:13

本文选题：双深位多层穿梭车储分系统 + 货位占用率　；参考：《山东大学》2017年硕士论文

【摘要】：传统的依赖于廉价劳动力的人工拣货作业模式已经无法满足当今电商领域物流拣货作业的要求。电商企业亟需从"人到货"的低速拣货作业模式转化为"货到人"的高速拣货作业模式。针对平台型电商以分拣为主、存储为辅的作业特点,如何实现订单的高效精准拣选和快速响应,是电商仓储物流发展所面临的关键问题。本文试图研究一种适用于电商物流的分布式自动化物流系统—双深位多层穿梭车储分系统,并介绍其主要硬件设备和作业模式,并且研究了该系统出库作业性能和倒货作业策略,该储分系统根据提升机周期内作业模式分为单作业模式和双作业模式两种类型。本文以提升机单作业模式下的出库作业性能分析和倒货作业策略为研究对象,通过分析计算出库作业中穿梭车和提升机的出库组成时间,研究了穿梭车和提升机的协同作业问题。本文首次研究基于双深位货架的多层穿梭车系统,该系统货架深度方向为两个货位,当穿梭车出库作业时就可能遇到倒货作业问题。使用改进的遗传算法和倒货策略,研究了穿梭车出库作业中发生的倒货问题,缩短了出库任务总时间,提高了穿梭车系统出库效率。本文主要研究内容以及成果如下:(1)使用货位占用率概念对穿梭车出库作业特点进行分析。一直以来穿梭车出库作业的倒货问题是制约双深位多层穿梭车大范围使用的关键难点,本文基于双深位货架系统的货位占用率,研究了在随机出库任务状态下,穿梭车取前排货物的概率和取后排货物的概率,建立了在货位占用率下的双深位多层穿梭车储分系统穿梭车出库作业模型。(2)基于货位占用率概念,研究了穿梭车和提升机出库作业的协同问题。通过研究穿梭车、提升机出库作业时间构成特点,分别地分析了在周期内穿梭车的作业性能和提升机的作业性能,通过仿真计算,定量得研究了设备速度、设备加速度、货位占用率、货架高度和长度等因素对于设备出库作业的影响。(3)研究了穿梭车倒货作业问题。解决倒货作业问题的根本在于减少倒货作业次数和缩短倒货作业距离,本文以穿梭车出库总任务时间最小化为目标,使用改进的遗传算法对该组合优化问题求解,求得最优出库任务顺序,以期减少倒货作业次数,对比研究三种倒货策略,以期减少倒货作业距离,并且对比分析了三种倒货策略的优劣性。
[Abstract]:The traditional manual picking operation model, which depends on the cheap labor force, has been unable to meet the requirements of the logistics picking operation in the electric business field. The e-commerce enterprises need to transform the low speed picking operation mode from "human arrival" into the "goods to human" high speed picking operation mode. It is the key problem to realize the efficient and accurate selection and quick response of the order. This paper tries to study a distributed automatic logistics system, a dual depth multi-layer shuttle storage system, which is suitable for e-commerce logistics, and introduces its main hardware setting and operation mode, and studies the system out of the library. Operation performance and reverse operation strategy, the storage system is divided into two types according to the operation mode of the hoist cycle, which are the single operation mode and the double operation mode. In this paper, the performance analysis and the reverse operation strategy under the single operation mode of the hoist are studied, and the shuttle bus and the hoist are analyzed and calculated. The library is composed of time and studies the cooperative work problem of shuttle and hoist. This paper first studies the multi storey shuttle bus system based on the double deep shelf. The system shelf is in a depth direction of two cargo positions. When the shuttle bus is out of the warehouse, it may encounter the problem of reverse cargo operation. The shuttle car is studied using the improved genetic algorithm and the reverse strategy. The reverse delivery problem in the outgoing operation reduces the total time of the outgoing task and improves the efficiency of the shuttle bus system. The main contents and results of this paper are as follows: (1) the characteristics of the shuttle outgoing operation are analyzed by using the concept of occupancy rate of the cargo space. In this paper, based on the occupancy rate of the double deep shelf system, this paper studies the probability of taking the front row goods and the probability of taking the back row goods under the condition of random out of warehouse, and establishes the operation model of the shuttles in the storage system of a double depth multi position shuttle vehicle under the occupancy rate of the cargo. (2) based on the cargo position. The concept of occupancy rate is used to study the synergy between shuttle and hoist operation. By studying the shuttle car and the feature of the lifting time of the hoist, the performance of the shuttle and the performance of the hoist are analyzed. The speed of equipment, the acceleration of the equipment and the occupancy rate of the cargo space are studied by the simulation calculation. The effect of the height and length of the shelf to the outgoing operation of the equipment. (3) the problem of the shuttle back operation is studied. The root of the problem solving is to reduce the number of reverse operation and to shorten the distance of the reverse operation. In this paper, the optimized genetic algorithm is used to minimize the total task time of the shuttle bus. The problem is solved and the order of optimal outgoing task is obtained. In order to reduce the number of reverse delivery operations, three kinds of reverse delivery strategies are compared in order to reduce the distance of the reverse delivery operation, and the advantages and disadvantages of the three kinds of reverse delivery strategies are compared and analyzed.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：F253.9

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