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Nonlinear Dynamic Analysis of Flexible Structures Traversed by Moving Loads
|Contributors: ||NTOU:Department of Mechanical and Mechatronic Engineering|
Nonlinear dynamic analysis;Flexible structure;Moving load;Impact factor;Mathematical model;Forced vibration
|Issue Date: ||2011-06-28T07:38:28Z
The purpose of this study is to conduct nonlinear dynamic analysis of flexible structures traversed by moving loads when the flexible structures undergo large deformations. Efficient design may not be achieved since the traditional linear analysis over-estimates the impact factors due to ignorance of the geometric nonlinearity when the moving load effect is too severe. The mathematical model of the nonlinear dynamic system is formulated by using the finite elements method, while a fictitious load vector resulting from the effect of geometric nonlinearity is added to the external force term. Computation of the equation of motion is iterated until a convergence criterion is satisfied. The impact factors of both deflection and moment at mid-point of the simply supported beam are calculated with varying moving speed of the moving load, as well as mass ratio. Another important concern is that free vibration of the moving load problem may result in more severe deflection than that due to forced vibration. This study also investigates the effects of shearing deformations and rotary inertia on the system dynamic behavior.
|Appears in Collections:||[機械與機電工程學系] 研究計畫|
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