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Asymptotic stability of a pendulum with quadratic damping

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Abstract

The equation considered in this paper is

$$x'' + h(t)\:x'|x'| + \omega^2\sin x = 0,$$

where h(t) is continuous and nonnegative for \({t \geq 0}\) and ω is a positive real number. This may be regarded as an equation of motion of an underwater pendulum. The damping force is proportional to the square of the velocity. The primary purpose is to establish necessary and sufficient conditions on the time-varying coefficient h(t) for the origin to be asymptotically stable. The phase plane analysis concerning the positive orbits of an equivalent planar system to the above-mentioned equation is used to obtain the main results. In addition, solutions of the system are compared with a particular solution of the first-order nonlinear differential equation

$$u' + h(t)u|u| + 1 = 0.$$

Some examples are also included to illustrate our results. Finally, the present results are extended to be applied to an equation with a nonnegative real-power damping force.

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  1. Department of Mathematics, Shimane University, Matsue, 690-8504, Japan

    Jitsuro Sugie

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  1. Jitsuro Sugie
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Correspondence to Jitsuro Sugie.

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Sugie, J. Asymptotic stability of a pendulum with quadratic damping. Z. Angew. Math. Phys. 65, 865–884 (2014). https://doi.org/10.1007/s00033-013-0361-x

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  • DOI: https://doi.org/10.1007/s00033-013-0361-x

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