International Journal of Aerospace System Engineering

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Dynamic Stability of Liquid in a Spherical Tank Covered with Membrane under Vertical Harmonic Excitation

  • Chiba, Masakatsu (Dept. of Aerospace Engineering, Osaka Prefecture University) ;
  • Murase, Ryo (Dept. of Aerospace Engineering, Osaka Prefecture University) ;
  • Nambu, Yohsuke (Dept. of Aerospace Engineering, Osaka Prefecture University) ;
  • Komatsu, Keiji (Japan Aerospace Exploration Agency (JAXA))
  • Received : 2015.06.15
  • Accepted : 2015.08.01
  • Published : 2015.12.30
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Abstract

Experimental studies were conducted on the liquid sloshing characteristics in a spherical tank covered with a flexible membrane. A spherical acrylic tank with 145.2 mm in radius was used as a test tank, and it was half-filled with water. Silicon membranes with 0.2 mm thickness were used as a test membrane with plane or hemispherical types. The test tank was harmonically excited in a vertical direction by an electro-dynamic exciter. In this case, a parametric instability vibration comes up when the excitation frequency is twice the natural frequency. Parametric instability regions of natural modes were measured for three cases, i.e. liquid surface is free, covered with plane membrane and hemi-spherical membrane.

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References

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