密集储分一体货架系统稳定性及变形监测研究

发布时间：2018-01-03 20:38

  本文关键词：密集储分一体货架系统稳定性及变形监测研究　出处：《山东大学》2016年博士论文　论文类型：学位论文

  更多相关文章： 密集储分一体化系统 货架穿梭车 钢结构货架 稳定性 变形监测

【摘要】：当今“互联网+”背景下,异军突起的电商物流在动态性、作业规模及数据规模等方面均大大超过了传统物流。面对物流量大幅度增加、仓储成本不断上涨以及电商物流订单的急剧增长等情况,使得物流仓储环节面临了严峻的考验。在此情况下,集成了货架穿梭车技术与密集货架技术的高效的仓储与分拣一体化系统——密集储分一体化系统(DCASS),成为当前电商物流中心广泛应用的仓储系统,这拉动了密集仓储货架需求量的快速增长。一般情况下,货架具有较强的稳定性,在承载货物时所受外力与内力会保持平衡。但是当货架自身结构或构件存在缺陷、货物摆放布局不合理或者遭受偶然冲击时,货架将会屈曲变形并产生局部失稳或整体失稳或局部与整体的相关失稳,以至于货架几何形状发生剧变或者突然崩溃,完全丧失工作能力并最终形成仓储安全事故。因此,货架结构的稳定性问题成为了热点研究问题。本文以电商物流领域广泛应用的DCASS货架系统为研究对象,对其进行了构件及其整体结构的稳定性理论分析；分别应用Matl ab及ANSYS对货架系统进行了有限元仿真分析与比较,探索了货架系统基于力学特性的稳定性；应用DCRP技术对货架系统在多台货架穿梭车同时运行的情况下进行了瞬时动态变形监测研究,对系统结构的稳定性进行了校验并量测货架系统的变形量。本文的主要工作及成果如下：1、在对密集储分一体化技术、货架系统及其构件的稳定性及货架瞬时变形监测技术的国内外研究现状进行综述的基础上,通过建立DCASS货架系统结构模型,对其构件及系统整体结构的稳定性进行了理论分析和研究；推导验算了货架的弯曲屈曲、扭转屈曲、弯扭屈曲及畸变屈曲的屈曲荷载计算方法,探究了货架横梁的整体稳定性及弯扭屈曲临界荷载的计算方法,探讨了局部屈曲的有效宽度计算方法,并通过货架立柱弹性变形监测实验,验证了货架构件的弹性屈曲变形特征。2、在分析货架系统的整体稳定性及失稳形式的基础上,基于静力分析分别对货架的对称屈曲、反对称屈曲及弹性屈曲进行了研究；研究了货架的基本自振周期及货架穿梭车的动力学特征,探究了基于货架穿梭车运行的DCASS货架屈曲荷载的计算方法；最后通过货架系统的震动变形破坏实验,探讨了钢结构货架弹性屈曲变形到弹塑性直至塑性变形屈曲的机理及监测方法,提出了预防货架整体屈曲变形的措施。3、在对有限元分析的原理进行系统研究的基础上,通过编制基于Matlab的单排DCASS货架有限元程序,分析了货架立柱及横梁的剪力、弯矩及轴力的分布特征,探索了货架系统构件的刚度及强度薄弱部位；通过建立基于ANSYS的货架三维立体有限元仿真模型,在多种荷载工况下对系统的变形情况进行有限元仿真分析,探索了货架结构及其构件的屈曲稳定特性；最后将Matlab运行结果与ANSYS的仿真分析结果进行对比,从中发现货架系统的薄弱部位,并提出了增强货架稳定性的建议。4、基于系统变形、变形分析及变形监测理论,对多元回归分析模型、灰色系统模型及卡尔曼滤波模型等三种变形分析预测方法进行了应用研究；基于普通数码相机的畸变差校正模型、平面时间基线视差模型与空间时间基线视差模型,应用DCRP技术对货架穿梭车正常作业状态下的DCASS货架系统进行瞬时动态变形监测,实时摄影并运用计算机软件绘出货架的荷载—变形曲线图。通过监测货架的整体变形情况并量测其变形量,预警货架的异常变形部位,为货架系统的稳定性校验及安全预警提供了参考依据。本文通过对DCASS货架系统稳定性的理论研究、仿真分析及实验验证,探索应用DCRP技术对货架系统进行瞬时动态变形监测,不仅可以保障仓储物流业的安全,而且填补了货架系统瞬时动态变形监测的理论空白,还可以为某些极端条件下的动态变形监测提供理论指导,具有重要的理论意义和实际参考价值。
[Abstract]:The "Internet plus" background, the electricity supplier logistics in A new force suddenly rises. dynamic operation, data size and scale etc. are much higher than the traditional logistics. The logistics quantity increase greatly, the rising cost of storage conditions and the rapid growth of electricity supplier logistics orders, the logistics warehousing is facing a severe test in this situation. Under the integrated shelf shuttle technology and dense shelf technology efficient storage and sorting system - intensive storage integration system (DCASS), a storage system widely used in the electricity supplier logistics center, this stimulating the rapid growth of demand for intensive storage shelves. In general, the shelf has strong stability, the from the external and internal forces will keep balance in carrying goods. But when the shelf structure or component defects, goods layout is not reasonable or even suffer But the impact, the shelves will produce local buckling instability or loss of overall instability or local and overall stability, so that the shelf geometry change or a sudden collapse, completely lost the ability to work and eventually form the warehouse safety accident. Therefore, the stability problem of the shelf structure has become a hot research issue. This paper widely DCASS shelf system the application in the field of electricity supplier logistics as the research object, analyzes the stability theory of components and the overall structure of the application of Matl AB and ANSYS respectively; the shelf system is simulated with finite element analysis and comparison, to explore the stability of mechanical properties based on the shelf system; while running on the shelf system in multiple shelf shuttle applications DCRP technology condition for the research on deformation monitoring of instantaneous dynamic, stability of the system has been checked and measured shelf system The amount of deformation. The main work and results are as follows: 1, in the integration of technology intensive storage, shelf system and its components are reviewed and the shelf stability instantaneous deformation monitoring technology at home and abroad based on the present research, through the establishment of DCASS storage system structure model, the stability of the whole structure of the component and system of the theoretical analysis and research; is checking the shelf torsional flexural buckling, buckling, buckling load calculation method of flexural torsional buckling and distortional buckling, explores the calculation method of overall stability and shelf beam flexural torsional buckling critical load, discusses the effective width of local buckling calculation method, and through the shelf post elastic deformation monitoring experiment verification the elastic buckling shelf component deformation features of.2, based on the stability analysis of the shelf system and instability forms, based on static analysis Don't be on the shelves of the symmetric buckling, antisymmetric buckling and elastic buckling were studied; on the basic shelf the dynamic characteristics of the vibration cycle and shelf shuttle, explores the calculation method of DCASS shelf shelf buckling load based on the shuttle operation; finally through the shelf system deformation vibration experiment on elastic shelf the steel structure buckling deformation mechanism to elastic-plastic buckling until plastic deformation and monitoring methods, put forward prevention measures.3 shelf buckling deformation, were systematically studied in the principle of the finite element analysis, through the preparation of single row shelf DCASS finite element program based on Matlab, analyzes the shear rack column and beam the distribution of axial force and bending moment, to explore the shelf system structural stiffness and strength of the weak parts; based on the shelf three-dimensional finite element simulation model ANSYS Type of deformation of the system under various loading finite element simulation analysis, explore the buckling characteristics of the structure and component of the shelf; finally the simulation analysis results of Matlab and ANSYS were compared to find the weak parts of the system from the shelf, and put forward to enhance the shelf stability of the proposed.4, based on the system deformation analysis and deformation monitoring, deformation theory, analysis model of multiple regression, grey system model and Calman filter model three kinds of deformation analysis and prediction method of application of ordinary digital cameras; distortion difference correction model based on planar time baseline parallax model and spatial time baseline parallax model, the application of DCRP technology for transient dynamic deformation the monitoring on the shelves of shuttle DCASS shelf system car under normal operation condition, and the use of computer software to load real-time photography draw shelf - deformation curve. By monitoring the deformation of the whole shelf and measuring the deformation, the abnormal deformation of parts warning shelf, provides reference for the stability check and safety warning shelving system. Based on the theoretical study on the stability of DCASS storage system, simulation analysis and experimental verification, explore the application of DCRP technology on the shelf system instantaneous dynamic deformation monitoring, not only can guarantee the safety of warehousing and logistics, and fill the shelves instantaneous dynamic deformation monitoring theory blank, but also can provide theoretical guidance for the deformation monitoring of some extreme conditions, has important theoretical significance and practical value.

【学位授予单位】：山东大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TH692
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本文编号：1375518