Interaction and multiscale mechanics

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Radial basis collocation method for dynamic analysis of axially moving beams

  • Wang, Lihua (School of Aerospace Engineering and Applied Mechanics, Tongji University) ;
  • Chen, Jiun-Shyan (Civil & Environmental Engineering Department, University of California Los Angeles (UCLA)) ;
  • Hu, Hsin-Yun (Mathematics Department, Tunghai University)
  • Received : 2009.09.01
  • Accepted : 2009.09.17
  • Published : 2009.12.25
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Abstract

We introduce a radial basis collocation method to solve axially moving beam problems which involve $2^{nd}$ order differentiation in time and $4^{th}$ order differentiation in space. The discrete equation is constructed based on the strong form of the governing equation. The employment of multiquadrics radial basis function allows approximation of higher order derivatives in the strong form. Unlike the other approximation functions used in the meshfree methods, such as the moving least-squares approximation, $4^{th}$ order derivative of multiquadrics radial basis function is straightforward. We also show that the standard weighted boundary collocation approach for imposition of boundary conditions in static problems yields significant errors in the transient problems. This inaccuracy in dynamic problems can be corrected by a statically condensed semi-discrete equation resulting from an exact imposition of boundary conditions. The effectiveness of this approach is examined in the numerical examples.

Keywords

References

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