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Differential Quadrature Analysis of Moving Load Problems

Differential Quadrature Analysis of Moving Load Problems
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Year:    2016

Author:    Xinwei Wang, Chunhua Jin

Advances in Applied Mathematics and Mechanics, Vol. 8 (2016), Iss. 4 : pp. 536–555

Abstract

The differential quadrature method (DQM) has been successfully used in a variety of fields. Similar to the conventional point discrete methods such as the collocation method and finite difference method, however, the DQM has some difficulty in dealing with singular functions like the Dirac-delta function. In this paper, two modifications are introduced to overcome the difficulty encountered in solving differential equations with Dirac-delta functions by using the DQM. The moving point load is work-equivalent to loads applied at all grid points and the governing equation is numerically integrated before it is discretized in terms of the differential quadrature. With these modifications, static behavior and forced vibration of beams under a stationary or a moving point load are successfully analyzed by directly using the DQM. It is demonstrated that the modified DQM can yield very accurate solutions. The compactness and computational efficiency of the DQM are retained in solving the partial differential equations with a time dependent Dirac-delta function.

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Journal Article Details

Publisher Name:    Global Science Press

Language:    English

DOI:    https://doi.org/10.4208/aamm.2014.m844

Advances in Applied Mathematics and Mechanics, Vol. 8 (2016), Iss. 4 : pp. 536–555

Published online:    2016-01

AMS Subject Headings:    Global Science Press

Copyright:    COPYRIGHT: © Global Science Press

Pages:    20

Keywords:    Differential quadrature method Dirac-delta function moving point load dynamic response work-equivalent load.

Author Details

Xinwei Wang

Chunhua Jin

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