柔性附着塔式起重机结构系统静态及动态特性研究

发布时间：2018-05-22 11:05

本文选题：柔性附着 + 塔式起重机　；参考：《西南交通大学》2011年硕士论文

【摘要】：柔性附着塔式起重机主要用于热电厂冷却塔施工等特殊场合,由于其应用场合的特殊性,采用钢丝绳软附着与塔壁连接,不仅能够灵活调节塔机与塔壁之间的距离,更有利于塔机及塔壁的受力,但塔机结构复杂。论文以传统力学理论为基础,研究塔机结构及动力学分析过程,并结合现代设计方法深入研究柔性附着塔机金属结构。有限元方法是目前应用最广泛的结构分析方法之一,利用ANSYS软件对柔性附着塔机结构进行分析,并运用APDL参数化方法计算不同参数环境下柔性附着塔机静态及动态特性。首先针对柔性附着塔式起重机,利用有限元法分析了附着层数对塔身强度及附着钢丝绳内力的影响；并在弹性范围内通过非线性大变形计算,考虑应力刚化现象,得到附着钢丝绳刚度及其预拉力对塔机强度、静刚度、动刚度、局部稳定性的变化曲线；同时得到柔性附着钢丝绳截面参数及预拉力与钢丝绳最大内力间的关系,为柔性附着塔机软附着参数的确定提供了设计依据。同时,提出柔性附着塔机最优附着策略。借助动力学分析理论,建立四质量四自由度的柔性附着塔机动力学模型,通过对动力学微分方程的建立与求解给出柔性附着塔机的动力学分析及求解过程。利用有限元方法详细研究各冲击载荷下柔性附着塔机的动态响应,得到塔机系统最危险构件的动载系数。通过APDL参数化建模,得到柔性附着塔机最危险构件的动态响应随吊重起升加速度、附着层数、附着钢丝绳关键参数的变化规律。避免因起升加速度以及附着钢丝绳参数选择不当引起塔机的动态不稳定性。本文为柔性附着塔机的安装及附着钢丝绳的选取提供了准确可靠的依据,并且从静态及动态两个方面验证了特殊场合下高起升高度塔机采用柔性附着的可行性。对于柔性附着塔机的设计及施工过程提供了重要的理论依据与指导意义。
[Abstract]:Flexible attached tower crane is mainly used for special occasions such as cooling tower construction in thermal power plant. Due to the particularity of its application, the soft attachment of wire rope and the connection of tower wall can not only adjust the distance between tower crane and tower wall flexibly, but also can adjust the distance between tower crane and tower wall. It is more favorable to the stress of tower crane and tower wall, but the structure of tower crane is complex. Based on the traditional mechanics theory, the paper studies the structure and dynamic analysis process of tower crane, and studies the metal structure of flexible attached tower crane with modern design method. Finite element method is one of the most widely used structural analysis methods at present. The structure of flexible attached tower crane is analyzed by ANSYS software, and the static and dynamic characteristics of flexible attached tower crane under different parameter environment are calculated by APDL parameterization method. Firstly, the influence of the number of attachment layers on the strength of tower body and the internal force of attached wire rope is analyzed by finite element method for flexible attached tower crane, and the phenomenon of stress stiffening is considered through nonlinear large deformation calculation in elastic range. The variation curves of the stiffness of attached wire rope and its pretension on the strength, static stiffness, dynamic stiffness and local stability of tower crane are obtained, and the relationship between the cross-section parameters of flexible attached wire rope and the pretension force and the maximum internal force of the wire rope is obtained. It provides the design basis for the determination of soft attachment parameters of flexible attachment tower crane. At the same time, the optimal attachment strategy of flexible attachment tower crane is proposed. With the help of dynamic analysis theory, the dynamic model of flexible attachment tower crane with four masses and four degrees of freedom is established. The dynamic analysis and solution process of flexible attachment tower crane are given through the establishment and solution of dynamic differential equation. The dynamic response of flexible attached tower crane under various impact loads is studied in detail by finite element method, and the dynamic load coefficient of the most dangerous components of tower crane system is obtained. By APDL parametric modeling, the dynamic response of the most dangerous components of flexible attachment tower crane is obtained with the lifting acceleration of the crane, the number of attachment layers and the key parameters of the attached wire rope. To avoid the dynamic instability of tower crane caused by lifting acceleration and improper selection of attached wire rope parameters. This paper provides an accurate and reliable basis for the installation of flexible attached tower crane and the selection of attached wire rope, and verifies the feasibility of flexible attachment for high lift tower crane under special circumstances from static and dynamic aspects. It provides important theoretical basis and guiding significance for the design and construction process of flexible attached tower crane.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH213.3

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