The free-core-nutation of triaxial Earth
Earths principal moments of inertia possess no biaxiality with the difference of A to B only 1/150 of that of A to C. And that of the fluid core is 1/5.3. So the former Earth rotation theory treats the rotation according to biaxial Earth ignoring the difference of A to B. Some of the works considered the effects of the difference on the free normal modes of Chandler wobble and free-core-nutation (FCN). Those works discovered that the approximations had high enough accuracy. However, the former Earth rotation theory can hardly explain many mechanisms of terms of long period polar motion. In this study, following the theorem mat the solution of rotation for triaxial body may be decompounded as straight product of three single pendulums with two positively hung and one inversely set, and the result that the rotation may have two stable elliptic trajectories and one instable saddle point for die case of single plane inverted pendulum, we obtain from Poincares core-mantle coupling model twin free polar motions and twin FCNs.
Wen-jun Wang Han-wei Zhang Wen-bin Shen
School of Surveying, Henan Polytechnic University, Jiaozuo, China Department of Geophysics/Key Lab. of Geospace Environment and Geodesy, School of Geodesy and Geomati
国际会议
The 5th International Conference on Nonlinear Mechanics(第五届国际非线性力学会议)
上海
英文
691-697
2007-06-11（万方平台首次上网日期，不代表论文的发表时间）