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Volume 42 Issue 4
Apr.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(4): 821-828.
ZHANG Xiaoqiang, FENG Jinfu, LIN Ke, et al. Added mass of trans-media moving object[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(4): 821-828. doi: 10.13700/j.bh.1001-5965.2015.0478(in Chinese)
Citation: ZHANG Xiaoqiang, FENG Jinfu, LIN Ke, et al. Added mass of trans-media moving object[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(4): 821-828. doi: 10.13700/j.bh.1001-5965.2015.0478(in Chinese)
shu

Added mass of trans-media moving object

doi: 10.13700/j.bh.1001-5965.2015.0478
  • 1.

    Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China

  • 2. PLA 95889, Jiuquan 735018, China

Funds:  National High-tech Research and Development Program of China
  • Received Date: 16 Jul 2015
  • Rev Recd Date: 25 Nov 2015
  • Publish Date: 20 Apr 2016
    Abstract
  • Trans-media moving object was equipped with outstanding advantages in multiple fluid media environment. However, its moving characteristics were hard to predict because of the free surface problem and complex stress. Added mass method was common to solve fluid-structure coupling problems in engineering, but the existing conclusions could not be extended to trans-media process with free surface. A new method was proposed aiming to solve the time-varying added mass problems in trans-media process. Changing laws of added mass of some cylinder were studied, which lied in different depths in both separation step and entry step of the trans-media process. It is shown that the two steps have same changing trend and similar depth-varying curve with the depth varying; in the same depth, normal added mass of separation step is near to that of the entry step and both depth-varying curves have linear characteristics; as for axial added mass, added inertia moment, and added static moment, the results of two steps in the same depth are different obviously, so the two steps are irreversible. The proposed method is helpful for design of trans-media structure, and can be extended to other situations of added mass computing with free surface.

     

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