本文關(guān)鍵詞：密集儲分一體貨架系統(tǒng)穩(wěn)定性及變形監(jiān)測研究　出處：《山東大學》2016年博士論文　論文類型：學位論文

  更多相關(guān)文章： 密集儲分一體化系統(tǒng) 貨架穿梭車 鋼結(jié)構(gòu)貨架 穩(wěn)定性 變形監(jiān)測

【摘要】：當今“互聯(lián)網(wǎng)+”背景下,異軍突起的電商物流在動態(tài)性、作業(yè)規(guī)模及數(shù)據(jù)規(guī)模等方面均大大超過了傳統(tǒng)物流。面對物流量大幅度增加、倉儲成本不斷上漲以及電商物流訂單的急劇增長等情況,使得物流倉儲環(huán)節(jié)面臨了嚴峻的考驗。在此情況下,集成了貨架穿梭車技術(shù)與密集貨架技術(shù)的高效的倉儲與分揀一體化系統(tǒng)——密集儲分一體化系統(tǒng)(DCASS),成為當前電商物流中心廣泛應用的倉儲系統(tǒng),這拉動了密集倉儲貨架需求量的快速增長。一般情況下,貨架具有較強的穩(wěn)定性,在承載貨物時所受外力與內(nèi)力會保持平衡。但是當貨架自身結(jié)構(gòu)或構(gòu)件存在缺陷、貨物擺放布局不合理或者遭受偶然沖擊時,貨架將會屈曲變形并產(chǎn)生局部失穩(wěn)或整體失穩(wěn)或局部與整體的相關(guān)失穩(wěn),以至于貨架幾何形狀發(fā)生劇變或者突然崩潰,完全喪失工作能力并最終形成倉儲安全事故。因此,貨架結(jié)構(gòu)的穩(wěn)定性問題成為了熱點研究問題。本文以電商物流領(lǐng)域廣泛應用的DCASS貨架系統(tǒng)為研究對象,對其進行了構(gòu)件及其整體結(jié)構(gòu)的穩(wěn)定性理論分析；分別應用Matl ab及ANSYS對貨架系統(tǒng)進行了有限元仿真分析與比較,探索了貨架系統(tǒng)基于力學特性的穩(wěn)定性；應用DCRP技術(shù)對貨架系統(tǒng)在多臺貨架穿梭車同時運行的情況下進行了瞬時動態(tài)變形監(jiān)測研究,對系統(tǒng)結(jié)構(gòu)的穩(wěn)定性進行了校驗并量測貨架系統(tǒng)的變形量。本文的主要工作及成果如下：1、在對密集儲分一體化技術(shù)、貨架系統(tǒng)及其構(gòu)件的穩(wěn)定性及貨架瞬時變形監(jiān)測技術(shù)的國內(nèi)外研究現(xiàn)狀進行綜述的基礎上,通過建立DCASS貨架系統(tǒng)結(jié)構(gòu)模型,對其構(gòu)件及系統(tǒng)整體結(jié)構(gòu)的穩(wěn)定性進行了理論分析和研究；推導驗算了貨架的彎曲屈曲、扭轉(zhuǎn)屈曲、彎扭屈曲及畸變屈曲的屈曲荷載計算方法,探究了貨架橫梁的整體穩(wěn)定性及彎扭屈曲臨界荷載的計算方法,探討了局部屈曲的有效寬度計算方法,并通過貨架立柱彈性變形監(jiān)測實驗,驗證了貨架構(gòu)件的彈性屈曲變形特征。2、在分析貨架系統(tǒng)的整體穩(wěn)定性及失穩(wěn)形式的基礎上,基于靜力分析分別對貨架的對稱屈曲、反對稱屈曲及彈性屈曲進行了研究；研究了貨架的基本自振周期及貨架穿梭車的動力學特征,探究了基于貨架穿梭車運行的DCASS貨架屈曲荷載的計算方法；最后通過貨架系統(tǒng)的震動變形破壞實驗,探討了鋼結(jié)構(gòu)貨架彈性屈曲變形到彈塑性直至塑性變形屈曲的機理及監(jiān)測方法,提出了預防貨架整體屈曲變形的措施。3、在對有限元分析的原理進行系統(tǒng)研究的基礎上,通過編制基于Matlab的單排DCASS貨架有限元程序,分析了貨架立柱及橫梁的剪力、彎矩及軸力的分布特征,探索了貨架系統(tǒng)構(gòu)件的剛度及強度薄弱部位；通過建立基于ANSYS的貨架三維立體有限元仿真模型,在多種荷載工況下對系統(tǒng)的變形情況進行有限元仿真分析,探索了貨架結(jié)構(gòu)及其構(gòu)件的屈曲穩(wěn)定特性；最后將Matlab運行結(jié)果與ANSYS的仿真分析結(jié)果進行對比,從中發(fā)現(xiàn)貨架系統(tǒng)的薄弱部位,并提出了增強貨架穩(wěn)定性的建議。4、基于系統(tǒng)變形、變形分析及變形監(jiān)測理論,對多元回歸分析模型、灰色系統(tǒng)模型及卡爾曼濾波模型等三種變形分析預測方法進行了應用研究；基于普通數(shù)碼相機的畸變差校正模型、平面時間基線視差模型與空間時間基線視差模型,應用DCRP技術(shù)對貨架穿梭車正常作業(yè)狀態(tài)下的DCASS貨架系統(tǒng)進行瞬時動態(tài)變形監(jiān)測,實時攝影并運用計算機軟件繪出貨架的荷載—變形曲線圖。通過監(jiān)測貨架的整體變形情況并量測其變形量,預警貨架的異常變形部位,為貨架系統(tǒng)的穩(wěn)定性校驗及安全預警提供了參考依據(jù)。本文通過對DCASS貨架系統(tǒng)穩(wěn)定性的理論研究、仿真分析及實驗驗證,探索應用DCRP技術(shù)對貨架系統(tǒng)進行瞬時動態(tài)變形監(jiān)測,不僅可以保障倉儲物流業(yè)的安全,而且填補了貨架系統(tǒng)瞬時動態(tài)變形監(jiān)測的理論空白,還可以為某些極端條件下的動態(tài)變形監(jiān)測提供理論指導,具有重要的理論意義和實際參考價值。
[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.

【學位授予單位】：山東大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TH692
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本文編號：1375518