Comparison of the Classical and the Global Solutions of the Ideal Resonance Problem

Details Comparison of the Classical and the Global Solutions of the Ideal Resonance Problem Comparison of the Classical and the Global Solutions of the Ideal Resonance Problem

Jul 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972cemec...5..451g&link_type=abstract

Celestial Mechanics, Volume 5, Issue 4, pp.451-469

Computer Science

7

Scientific paper

The Ideal Resonance Problem is defined by the Hamiltonian F = B(y) + 2\varepsilon A(y) sin ^2 x,\varepsilon ≪ 1. The classical solution of the Problem, expanded in powers of ɛ, carries the derivativeB' as a divisor and is, therefore, singular at the zero ofB', associated with resonance. With α denoting theresonance parameter, defined by α equiv - B'/|4AB''|^{1/2} μ ,μ = \varepsilon ^{1/2} , it is shown here that the classical solution is valid only for α ^2 ≥slant 0(1/μ ). In contrast, the global solution (Garfinkelet al., 1971), expanded in powers ofμ=ɛ1/2, removes the classical singularity atB'=0, and is valid for all α. It is also shown here that the classical solution is an asymptotic approximation, for largeα 2, of the global solution expanded in powers ofα -2. This result leads to simplified expressions for resonancewidth and resonantamplification. The two solutions are compared with regard to their general behavior and their accuracy. It is noted that the global solution represents a perturbed simple pendulum, while the classical solution is the limiting case of a pendulum in a state offast circulation.

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