Instability load analysis of a telescopic boom for an all-terrain crane

Instability load analysis of a telescopic boom for an all-terrain crane
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全路面起重机伸缩臂失稳载荷分析

DOI:
10.5194/ms-13-991-2022
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发表时间:
2022-11
影响因子:
1.4
通讯作者:
Tianyu Wang
Tianyu Wang
中科院分区:
工程技术4区
文献类型:
--
作者:
Jinshuai Xu;Yingpeng Zhuo;Zhaohui Qi;Gang Wang;Tianjiao Zhao;Tianyu Wang

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对全地形起重机伸缩臂的失稳载荷进行了研究。结合伸缩臂的结构特点,将每个伸缩臂段划分为多个子结构,并基于共转法建立每个子结构的定体坐标系。推导了伸缩臂的三维欧拉-伯努利偏心梁单元。在考虑重力和风荷载离散化的前提下,将子结构内部自由度浓缩到边界节点,形成几何非线性超单元。根据伸缩臂的嵌套方式,建立了约束方式。在给定预紧力的情况下,计算了吊臂系的无应力原始长度,建立了吊臂系在吊绳外力作用下的平衡方程及相应的切向刚度矩阵。针对上述工作,提出了一种计算伸缩臂结构平衡路径和失稳载荷的新方法,即以微分形式求解伸缩臂结构的控制方程。最后,通过不同特征的算例对该方法进行了验证。
The instability load for the telescopic boom of an all-terrain crane is investigated in this paper. Combined with structural characteristics of the telescopic boom, each boom section is divided into several substructures, and the fixed-body coordinate system of each substructure is established based on the co-rotational method. A 3D Euler–Bernoulli eccentric beam element of the telescopic boom is derived. On the premise of considering the discretization of gravity and wind load, internal degrees of freedom of the substructure are condensed to the boundary nodes, forming a geometrical nonlinear super element. According to the nesting mode of the telescopic boom, a constraint way is established. The unstressed original length of the guy rope is calculated with a given preload so as to establish the equilibrium equations of the boom system with the external force of the guy rope and the corresponding tangent stiffness matrix. Regarding the above work, a new method for calculating the structural equilibrium path and instability load of telescopic boom structure is presented by solving the governing equations in a differential form. Finally, the method is validated by examples with different features.
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