Title: Vibration mode check and non-contact measurement on metallic structure of tower crane
Abstract: The structure features and operating requirements of tower crane produce inevitable vibration.Nevertheless,people usually pay more attentions on the static strength,static stiffness and stability in the crane designs and examinations.The research on vibration becomes a vital aspect of modern tower crane.The paper introduces the finite element method in solving the vibration modes.Beam element,bar element and plate element are used to model the complex metallic structure.Load combination under different work conditions are used in the loading of structure according to the national standard.The solving and the post-processing are the typical methods used in FEM vibration analysis.To note,tower crane vibration measurement is difficult and complicated to be practiced in common method.A non-contact method is applied to dynamically measure the frequency of metallic structure vibration.A new architecture of the non-contact vibration measurement for metallic structure is shown.Following the introduction of some algorithms used in the object tracking,a simple and effective algorithm that used in the target tracking is adopted in image processing.The data obtained from the image processing are processed in time-frequency domain.The results of non-contact measurement are compared in detail with the FEM method.The test confirms that the vibration modes of the tower crane could be effectively acquired by using finite element method and the results are partially close to the non-contact method.The error is less than 15%.Briefly,through the analysis of finite element method and non-contact measurement;the stiffness relationship of metallic structural components of tower crane can be obtained.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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