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Structure Analysis and Optimization Design for 150 Tons Flat-Top Crane

Author: DengZhiQiang
Tutor: XiaYongFa
School: Northeastern University
Course: Mechanical Design and Theory
Keywords: flat-top crane Finite Element ANSYS structure analysis optimal design
CLC: TH213.3
Type: Master's thesis
Year: 2009
Downloads: 44
Quote: 0
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Abstract


With the improvement of mechanization of the construction industry, the advantage of flat-top crane in the working process of group towers at the same site is recognized more and more. The demands for amounts of flat-top tower cranes are raised. Therefore, the analysis for the structure property of flat-top tower cranes is more and more valuable and practical.Theoretically based on the Finite Element Method and Optimal Method, this thesis utilizes the FEM software ANSYS to analyze the strength of the tower crane, stiffness, mode, harmonic response and buckling stability of tower crane in typical working conditions. and optimizes the structure dimensions by means of ANSYS optimization module in order to meet demands of light weight. The main research works are as follows:(1) The thesis utilizes ANSYS beam element BEAM 188 to simplify the space truss structure to establish of the flat-top crane finite element model comprehensively by means of ANSYS solid modeling and direct modeling method. Based on parametric technology, the thesis utilizes APDL to write the finite element parametric program of whole structure. In the four chosen typical operating conditions, the thesis analyzes the static strength, stiffness of tower crane by load combination.(2)The thesis analyzes modal property and harmonic response characteristics of the tower crane, extracts of the former 8 natural frequencies and vibration mode. The results are analyzed, and the vibration of tower crane belongs to low-frequency vibration. Through the harmonic response analysis, the thesis determines steady-state response and amplitude-frequency curve of flat-top crane under sinusoidal excitation, and the peak status can be found from the response curves.(3)The thesis describes the structure of ANSYS eigenvalue buckling and nonlinear buckling analysis, and utilizes ANSYS to carry out the buckling analysis of structure of the flat-top crane. Through the eigenvalue buckling analysis in typical conditions, buckling critical load can be obtained, and the overall stability of the structure can be measured.(4)In the working condition of maximum lifting torque to hold the maximum lifting load, the thesis operates optimal design for the flat-top crane, and on condition of meeting the demands of stiffness and strength, etc, the quality flat-top crane are reduced reasonably by optimizing the shape of the main structure and the cross-section size of components.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Lifting machinery and transport machinery > Lifting machinery > Mobile crane > Tower
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