American Institute of Mathematical Sciences

July  2011, 16(1): 319-332. doi: 10.3934/dcdsb.2011.16.319

Vanishing singularity in hard impacting systems

 1 Electrical Engineering and Computer Science Department, University of Michigan, Ann Arbor, United States 2 Department of Physical Sciences, Indian Institute of Science Education & Research, Mohanpur-741252, Nadia, West Bengal, India 3 School of Electrical, Electronic and Computer Engineering, Newcastle University, NE1 7RU, England, United Kingdom

Received  February 2010 Revised  June 2010 Published  April 2011

It is known that the Jacobian of the discrete-time map of an impact oscillator in the neighborhood of a grazing orbit depends on the square-root of the distance the mass would have gone beyond the position of the wall if the wall were not there. This results in an infinite stretching of the phase space, known as the square-root singularity. In this paper we look closer into the Jacobian matrix and find out the behavior of its two parameters---the trace and the determinant, across the grazing event. We show that the determinant of the matrix remains invariant in the neighborhood of a grazing orbit, and that the singularity appears only in the trace of the matrix. Investigating the character of the trace, we show that the singularity disappears if the damped frequency of the oscillator is an integral multiple of half of the forcing frequency.
Citation: Soumya Kundu, Soumitro Banerjee, Damian Giaouris. Vanishing singularity in hard impacting systems. Discrete & Continuous Dynamical Systems - B, 2011, 16 (1) : 319-332. doi: 10.3934/dcdsb.2011.16.319
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