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Volume 57 Issue 5
Oct.  2022
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Journal of Southwest Jiaotong University  > 2022  >  57(5): 1040-1046.
LI Xuewei, ZHAO Xiaohua, HUANG Lihua, RONG Jian. Influence Mechanism of Bridge Sign Complexity on Cognitive Characteristics of Drivers’ Electroencephalogram[J]. Journal of Southwest Jiaotong University, 2021, 56(5): 913-920. doi: 10.3969/j.issn.0258-2724.20200109
Citation: TAN Minyao, CHENG Wenming, LI Hangfei, ZANG Fulian. Free Vibration Analysis of Thin-Walled Box Beam of Crane Considering Distortion[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1040-1046. doi: 10.3969/j.issn.0258-2724.20200613
shu

Free Vibration Analysis of Thin-Walled Box Beam of Crane Considering Distortion

doi: 10.3969/j.issn.0258-2724.20200613

  • School of Mechatronics Engineering, Southwest Jiaotong University, Chengdu 610031, China

  • Received Date: 09 Sep 2020
  • Rev Recd Date: 30 Oct 2020
    • Available Online: 09 Aug 2022
  • Publish Date: 04 Nov 2020
    Abstract

  • In order to improve the calculation accuracy of the natural frequency of thin-walled box beams, the dynamic characteristics of thin-walled box beams are analyzed using the generalized coordinate principle. Firstly, the free vibration differential equations of five highly coupled modes (i.e., extension, bending, torsion, warping and distortion) are obtained by the virtual work principle and considering the influence of the distortion deformation. Secondly, considering the influence of the rotational inertial motion term, the kinematics model under the simply supported boundary condition is established. The fourth order algebraic equation of free vibration of the thin-walled box beam and the exact solution of the natural frequency are obtained. Finally, a numerical example is provided to compare the exact solution of natural frequency considering distortion with the results of Prokić theory and finite element analysis, so that the effectiveness and accuracy of present method are verified. The results show that when taking the distortion effect into consideration, the natural frequency of free vibration of the thin-walled box beam can be more accurately reflected in high-order modes. Comparison of natural frequencies at four orders of the free vibration indicates that when the length of the box girder is 3 m, the relative error of the present theory was reduced to 0.38% from Prokić’s 0.42%; when the length of the box girder is 4 and 5 m, the relative error can be further reduced to 0.30% and 0.40%, respectively.

     

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    • References(22)
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