Experimental evidence of non-linear resonance effects between retrograde precession and the tilt-over mode within a spheroid

Details Experimental evidence of non-linear resonance effects between retrograde precession and the tilt-over mode within a spheroid Experimental evidence of non-linear resonance effects between retrograde precession and the tilt-over mode within a spheroid

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.154..407n&link_type=abstract

Geophysical Journal International, Volume 154, Issue 2, pp. 407-416.

Astronomy and Astrophysics

Astronomy

17

Earth'S Core, Earth'S Rotation, Nutation

Scientific paper

The Poincaré flow (also known as the tilt-over mode) in a precessing cavity filled with water is investigated experimentally. Assuming that the flow is mainly a solid-body rotation, we have used three independent techniques to determine this rotation: introduction of light ceramic particles to materialize the fluid rotation axis, pressure measurements at the cavity wall, and ultrasonic Doppler anenometry. With the latter technique, we determine the angle between the solid body rotation vector and the cavity axis indirectly, through the secondary flow - oblique shear layers which are stationary in a frame rotating at the precession rate - that the differential rotation at the boundary induces within the fluid. Rapid changes in the direction of the axis of rotation of the fluid for critical values of the rate of precession and of the rate of rotation are demonstrated. In some cases, the inclination of the fluid rotation vector with respect to the cavity axis much exceeds the inclination of the prescribed precession vector. A torque approach, which can be generalized, shows that this effect is due to a non-linear resonance between the frequencies of the Poincaré mode and of precession. As a result, we can determine the validity domain of current models of precession and nutations of planets enclosing a fluid core.

Affiliated with

Also associated with

No associations

Rating

Experimental evidence of non-linear resonance effects between retrograde precession and the tilt-over mode within a spheroid does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Experimental evidence of non-linear resonance effects between retrograde precession and the tilt-over mode within a spheroid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Experimental evidence of non-linear resonance effects between retrograde precession and the tilt-over mode within a spheroid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1669476