Dynamics of telescopic cranes with flexible structural components
Dynamics of telescopic cranes with flexible structural components
复制标题
具有柔性结构部件的伸缩臂起重机的动力学
DOI：
10.1016/j.ijmecsci.2014.07.009
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发表时间：
2014
影响因子：
7.3
通讯作者：
A. Trąbka
中科院分区：
文献类型：
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作者：
A. Trąbka
今天的起重机的数值模型是缺乏一些简化，在过去使用。这些变化主要考虑了那些过去被视为不可变形的结构部件的柔性。因此，不同的研究分析相同的工作动作基于不同的model.The本文提出了十个变量的计算模型的伸缩臂起重机，不同的数量和选择的柔性组件。分析了上述差异对真实的结构动力特性计算模型映射正确性的影响。采用有限元法进行建模和数值模拟。定性和定量地评价了数值模拟结果与真实的结构试验结果的一致性。分析了应用离散傅里叶变换后的时间特性和频率特性。分析表明，为保证解的正确性，修正构件参数的确定应考虑其与周围环境的相互作用。谱线的形状和位置相对于模型的整体灵活性的变化的比较有助于决定哪些组件应该被修改，哪些应该被省略，以正确地模仿一个真实的结构的动态特性。
Today׳s crane numerical models are devoid of some of the simplifications that were used in the past. These changes primarily take into account flexibilities of those structural components that used to be treated as non-deformable. Consequently, various studies analyse the same working movements based on different models.The paper presents ten variants of a computational model for a telescopic boom crane that differs in number and selection of flexible components. It has been analysed how the above-mentioned differences affect the correctness of mapping the dynamic properties of real structures via their computational models. Modelling and numerical simulations were conducted using the finite element method. The compatibility of the numerical simulation results and test results of a real structure was qualitatively and quantitatively assessed. Time characteristics and frequency characteristics after application of the discrete Fourier transformation were analysed. The analyses showed that the parameters of the modified components should be determined by taking into account their interactions with their surroundings in order to ensure correctness of the solutions. A comparison of the shape and position of spectral lines with respect to changes in the overall flexibility of the models facilitates in deciding which components should be modified and which should be omitted in order to correctly imitate the dynamic properties of a real structure.