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Volume 41 Issue 7
Jul.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(7): 1239-1245.
LIU Ning, LI Min, SUN Jieet al. Propagation characteristics of Rayleigh wave under gravity based on FDTD method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1239-1245. doi: 10.13700/j.bh.1001-5965.2014.0503(in Chinese)
Citation: LIU Ning, LI Min, SUN Jieet al. Propagation characteristics of Rayleigh wave under gravity based on FDTD method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1239-1245. doi: 10.13700/j.bh.1001-5965.2014.0503(in Chinese)
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Propagation characteristics of Rayleigh wave under gravity based on FDTD method

doi: 10.13700/j.bh.1001-5965.2014.0503

  • Institute of Solid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 11 Aug 2014
  • Rev Recd Date: 20 Nov 2014
  • Publish Date: 20 Jul 2015
    Abstract
  • R wave is short for Rayleigh wave. R wave, on which the effect of gravity is generally inevitable, has received considerably extensive attention and been widely used in many fields, such as geological exploration, nondestructive test, etc. The effects of gravity on R wave velocity for elastic parameters were further analyzed based on available R wave velocity function, and the applicable range of the approximate one was given as well. Wave propagation through quasi-half-space isotropic linear elastic medium with gravity, under the excitation of differentiated Gaussian pulse (DGP) was studied by finite difference time domain (FDTD) method with staggered grid discretization, and extended boundary conditions were introduced. Velocity values obtained were closer to the theoretical ones. Meanwhile, the influence of gravity on time domain, frequency domain response was discussed. By analyzing the theoretical and numerical results, it is necessary to take the effect of gravity into account in simulation for more accurate prediction.

     

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