Research Of Storage-retrieval Strategies For Laneway-stow-typed Automatic 3D-Park

In order to solve the problem of difficult-to-park, our country strives to develop Automatic 3D-Park, making full use of the underground resources and outerspace resources, and reducing the occupied area of land resources, which, in a degree, alleviating the difficult predicament. However, the service capabilities of Automatic 3D-Park should be improved quickly which mainly reflected in shortening the time-consuming of taking-out and placing-in of cars. Then, how to choose appropriate Storage-retrieval Strategies becomes a hot topic in the present research of garage, for that it is the key of reducing time-consuming of cars accessing. This thesis regards Laneway-stow-typed Automatic 3D-Park which berth layout is not independent as the research objects, its Storage-retrieval Strategies are discussed detailedly. Both selecting a more appropriate Storage-retrieval Strategy for Automatic 3D-Park and providing an evidence to enhance its service capacity on the basis of this paper.This paper mainly concerns about:(1) The structure and the type of Automatic 3D-Park are compared. The advantages and disadvantages of all types of garage are summed up. Stacker as the main equipment of Laneway-stow-typed Automatic 3D-Park is especially recommended, including its structure, work principle and process of taking-out and placing-in of cars. The analysis shows that time-consuming of stacker is an important factor to Garage Storage-retrieval Strategies, it is necessary to study it in-depth.(2) The layout of parking space which is not independent among rows can be explained wonderfully according to the entity model of solid garage. The aim of simplifying its model is in order to analysis its Storage-retrieval Strategies conveniently. Firstly, in the simplified model, the access process and time-consuming mathematical expression of stacker are narrated combining with two Storage-retrieval Strategies of garage. Then, under staying await orders strategy, two kinds of berth select rule are described and compared, including nearby access principle and random access principle. After many times of calculations for these two models by Delphi7 programming, the time spending on accessing cars by stacker is calculated, at the same time, its probability statistic character of nearby access principle is discussed.(3) In order to evaluate the Garage Storage-retrieval Strategies more truly and more objectively, the dynamic nature of the garage must be considered. So the knowledge of Queuing System is put forward including system components, system model and system metrics and so on. The process of accessing cars is confirmed to subject to M/D/1 queuing model usingχ2 hypothesis testing method, according to the arrival rules of vehicles, quantity and servicing time of stockers. At first, the capability of Storage-retrieval Strategies has been analyzed based on this queuing model. Then the M/D/1 queuing model has been improved to a more perfect model considering with both the arrival and departure of vehicles. Finally, the Storage-retrieval Strategies have been analyzed referring to the efficiency of the stacker and the change of the traffic flow.The results of this paper largely enrich the Storage-retrieval Strategies of garage contents, especially for the case of garage which berth layout is not independent.