柔性附着动臂式塔式起重机动特性分析

发布时间：2018-03-29 20:47

本文选题：动臂式塔机　切入点：柔性附着　出处：《沈阳建筑大学》2012年硕士论文

【摘要】：动臂式塔式起重机是一种在户外工作的大型工程机械，动臂式塔式起重机是消化吸收引进国外技术结合国内经验设计制造的上回转自升式塔式起重机，有多种使用方式。动臂式塔机由于平衡短，臂架可在15°-85°之间变动，非常适合密集及狭窄地区施工，，有独特的施工能力。当塔机的高度超过其独立高度时，就必须采用附着装置对塔身进行加固，使塔机依附固定在建筑物上。塔机的附着装置有刚性附着和柔性附着两种，当受到现场施工条件等客观因素限制，例如在冷却塔的施工中，其纵剖面为双曲线，半径较大且随着高度的不同而变化。如采用一般的刚性附着，不仅会大大增加设备成本，而且安装复杂，对冷却塔壁也会造成较大影响。因此，冷却塔施工所用塔机通常采用柔性附着将塔身附着于冷却塔壁上的柔性附着方式。本文基于动力学分析理论和有限元计算方法，使用大型通用有限元分析软件ANSYS，建立了柔性附着动臂式起重机整机的有限元模型，对模型进行静态分析和动态分析。论文的主要内容有：根据起重机动力学理论，使用ANSYS软件，建立柔性附着动臂式起重机整机有限元模型，该模型包括杆单元、梁单元以及质量单元；对上述模型进行静力分析得到最大应力和位移；进行模态分析得到模型的前六阶固有频率和振型；对整机模型进行瞬态分析，得到了柔性附着动臂式起重机在非工作状态工况风载荷作用下的位移响应曲线和在最大幅度下的起升激励载荷作用的位移响应曲线，得到了非工作状态下和离地起升工况下系统响应特性(包括应力和位移)。总之，柔性附着动臂式起重机的动力学分析，是将先进的设计、分析应用于柔性附着动臂式起重机设计中，为设计经济、可靠、稳定和高性能的柔性附着动臂式起重机提供有力的工具和实现方法。
[Abstract]:Jib tower crane is a kind of large construction machinery which works outdoors. The tower crane is designed and manufactured with imported foreign technology and domestic experience. There are many ways to use it. Because of its short balance, the boom can be varied between 15 掳and 85 掳, which is very suitable for construction in dense and narrow areas and has unique construction capability. When the height of tower crane exceeds its independent height, It is necessary to reinforce the tower body by means of attachment device, so that the tower crane can be attached to the building. There are two kinds of attachment devices for tower crane: rigid attachment and flexible attachment, which are restricted by objective factors such as site construction conditions, etc. For example, in the construction of cooling tower, the vertical section is hyperbolic, the radius is large and varies with the height. If the general rigid attachment is adopted, the equipment cost will be greatly increased, and the installation will be complicated. Therefore, the tower crane used in the construction of cooling tower usually adopts the flexible attachment mode of attaching the tower body to the cooling tower wall. Based on the theory of dynamic analysis and the finite element method, the finite element model of the flexible attached jib crane is established by using the finite element analysis software ANSYS. The main contents of this paper are as follows: according to the theory of crane dynamics and using ANSYS software, the finite element model of flexible attached jib crane is established. Beam element and mass element; static analysis to obtain maximum stress and displacement; modal analysis to obtain the first six natural frequencies and modes of the model; transient analysis of the whole machine model, The displacement response curve of flexible attached jib crane under wind load under off-working condition and the displacement response curve of lifting excitation load at maximum amplitude are obtained. The response characteristics (including stress and displacement) of the system under off-working and off-ground lifting conditions are obtained. In a word, the dynamic analysis of the flexible attached jib crane is to apply the advanced design to the design of the flexible attached jib crane for the sake of economic and reliable design. Stable and high-performance flexible attached jib cranes provide powerful tools and implementation methods.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH213.3

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