Period to delay ratio near stability boundaries for systems with delayed feedback

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Abstract

We show how, with a suitable choice of a "free" parameter, period to delay ratios near stability boundaries may be found for delay-differential systems with a single delay, and with a characteristic equation of the form F(λ) + G(λ)e-λτ = 0. When F and G do not depend on the delay, τ itself is a natural choice for the free parameter, and the the period to delay ratio can be easily found for given values of the parameters of F and G. It is shown that if more than one stability switch occurs for such a system as τ is increased, then the period to delay ratio will become progressively smaller with each stable-unstable change. By considering a model with a variable delay, we demonstrate how to determine period to delay ratios when the characteristic equation is such that F and G themselves depend on τ, and show that for the model considered, the period must always lie between τ and 2τ. An Appendix considers the appearance of zero eigenvalues in such characteristic equations. © 1988.

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APA

Jones, A. E., Nisbet, R. M., Gurney, W. S. C., & Blythe, S. P. (1988). Period to delay ratio near stability boundaries for systems with delayed feedback. Journal of Mathematical Analysis and Applications, 135(1), 354–368. https://doi.org/10.1016/0022-247X(88)90160-6

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