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Stabilization of difference equations with noisy proportional feedback control
1.  Dept. of Math. and Stats., University of Calgary, 2500 University Drive N.W. Calgary, AB, T2N 1N4, Canada 
2.  Department of Mathematics, the University of the West Indies, Mona Campus, Kingston, Jamaica 
Given a deterministic difference equation $x_{n+1}= f(x_n)$ with a continuous $f$ increasing on $[0, b]$, $f(0) \geq 0$, we would like to stabilize any point $x^{\ast}\in (f(0), f(b))$, by introducing the proportional feedback (PF) control. We assume that PF control contains either a multiplicative $x_{n+1}= f\left((\nu + \ell\chi_{n+1})x_n \right)$ or an additive noise $x_{n+1}=f(\lambda x_n) +\ell\chi_{n+1}$. We study conditions under which the solution eventually enters some interval, treated as a stochastic (blurred) equilibrium. In addition, we prove that, for each $\varepsilon>0$, when the noise level $\ell$ is sufficiently small, all solutions eventually belong to the interval $(x^{\ast}\varepsilon, x^{\ast}+\varepsilon)$.
References:
[1] 
J. A. D. Appleby, G. Berkolaiko and A. Rodkina, Nonexponential stability and decay rates in nonlinear stochastic difference equations with unbounded noise, Stochastics, 81 (2009), 99127. Google Scholar 
[2] 
J. A. D. Appleby, C. Kelly, X. Mao and A. Rodkina, On the local dynamics of polynomial difference equations with fading stochastic perturbations, Dyn. Contin. Discrete Impuls. Syst. Ser. A Math. Anal., 17 (2010), 401430. Google Scholar 
[3] 
J. A. D. Appleby, X. Mao and A. Rodkina. On stochastic stabilization of difference equations, Discrete Contin. Dyn. Syst., 15 (2006), 843857. Google Scholar 
[4] 
E. Braverman and B. Chan, Stabilization of prescribed values and periodic orbits with regular and pulse target oriented control, Chaos, 24 (2014), 013119, 7pp. Google Scholar 
[5] 
E. Braverman, C. Kelly and A. Rodkina, Stabilisation of difference equations with noisy predictionbased control, Physica D, 326 (2016), 2131. Google Scholar 
[6] 
E. Braverman and E. Liz, Global stabilization of periodic orbits using a proportional feedback control with pulses, Nonlinear Dynamics, 67 (2012), 24672475. Google Scholar 
[7] 
E. Braverman and E. Liz, On stabilization of equilibria using predictive control with and without pulses, Comput. Math. Appl., 64 (2012), 21922201. Google Scholar 
[8] 
E. Braverman and A. Rodkina, Stabilization of two cycles of difference equations with stochastic perturbations, J. Difference Equ. Appl., 19 (2013), 11921212. Google Scholar 
[9] 
E. Braverman and A. Rodkina, Difference equations of Ricker and logistic types under bounded stochastic perturbations with positive mean, Comput. Math. Appl., 66 (2013), 22812294. Google Scholar 
[10] 
E. Braverman and A. Rodkina, On convergence of solutions to difference equations with additive perturbations, J. Difference Equ. Appl., 22 (2016), 878903. Google Scholar 
[11] 
P. Carmona and D. Franco, Control of chaotic behaviour and prevention of extinction using constant proportional feedback, Nonlinear Anal. Real World Appl., 12 (2011), 37193726. Google Scholar 
[12] 
C. W. Clark, Mathematical bioeconomics: The optimal management of renewable resources, 2nd Edition, John Wiley & Sons, Hoboken, New Jersey, 1990. Google Scholar 
[13] 
C. Kelly and A. Rodkina, Constrained stability and instability of polynomial difference equations with statedependent noise, Discrete Contin. Dyn. Syst. B, 11 (2009), 913933. Google Scholar 
[14] 
E. Liz, How to control chaotic behaviour and population size with proportional feedback, Phys. Lett. A, 374 (2010), 725728. Google Scholar 
[15] 
E. Liz and A. RuizHerrera, The hydra effect, bubbles, and chaos in a simple discrete population model with constant effort harvesting, J. Math. Biol., 65 (2012), 9971016. Google Scholar 
[16] 
J. G. Milton and J. Bélair, Chaos, noise, and extinction in models of population growth, Theor. Popul. Biol., 37 (1990), 273290. Google Scholar 
[17] 
H. Seno, A paradox in discrete single species population dynamics with harvesting/thinning, Math. Biosci., 214 (2008), 6369. Google Scholar 
[18] 
L. Shaikhet, Optimal Control of Stochastic Difference Volterra Equations, An Introduction. Studies in Systems, Decision and Control 17, Springer, Cham, 2015. Google Scholar 
[19] 
A. N. Shiryaev, Probability, (2nd edition), Springer, Berlin, 1996. Google Scholar 
[20]  H. R. Thieme, Mathematics in Population Biology, Princeton University Press, Princeton, 2003. Google Scholar 
[21] 
E. F. Zipkin, C. E. Kraft, E. G. Cooch and P. J. Sullivan, When can efforts to control nuisance and invasive species backfire?, Ecological Applications, 19 (2009), 15851595. Google Scholar 
show all references
References:
[1] 
J. A. D. Appleby, G. Berkolaiko and A. Rodkina, Nonexponential stability and decay rates in nonlinear stochastic difference equations with unbounded noise, Stochastics, 81 (2009), 99127. Google Scholar 
[2] 
J. A. D. Appleby, C. Kelly, X. Mao and A. Rodkina, On the local dynamics of polynomial difference equations with fading stochastic perturbations, Dyn. Contin. Discrete Impuls. Syst. Ser. A Math. Anal., 17 (2010), 401430. Google Scholar 
[3] 
J. A. D. Appleby, X. Mao and A. Rodkina. On stochastic stabilization of difference equations, Discrete Contin. Dyn. Syst., 15 (2006), 843857. Google Scholar 
[4] 
E. Braverman and B. Chan, Stabilization of prescribed values and periodic orbits with regular and pulse target oriented control, Chaos, 24 (2014), 013119, 7pp. Google Scholar 
[5] 
E. Braverman, C. Kelly and A. Rodkina, Stabilisation of difference equations with noisy predictionbased control, Physica D, 326 (2016), 2131. Google Scholar 
[6] 
E. Braverman and E. Liz, Global stabilization of periodic orbits using a proportional feedback control with pulses, Nonlinear Dynamics, 67 (2012), 24672475. Google Scholar 
[7] 
E. Braverman and E. Liz, On stabilization of equilibria using predictive control with and without pulses, Comput. Math. Appl., 64 (2012), 21922201. Google Scholar 
[8] 
E. Braverman and A. Rodkina, Stabilization of two cycles of difference equations with stochastic perturbations, J. Difference Equ. Appl., 19 (2013), 11921212. Google Scholar 
[9] 
E. Braverman and A. Rodkina, Difference equations of Ricker and logistic types under bounded stochastic perturbations with positive mean, Comput. Math. Appl., 66 (2013), 22812294. Google Scholar 
[10] 
E. Braverman and A. Rodkina, On convergence of solutions to difference equations with additive perturbations, J. Difference Equ. Appl., 22 (2016), 878903. Google Scholar 
[11] 
P. Carmona and D. Franco, Control of chaotic behaviour and prevention of extinction using constant proportional feedback, Nonlinear Anal. Real World Appl., 12 (2011), 37193726. Google Scholar 
[12] 
C. W. Clark, Mathematical bioeconomics: The optimal management of renewable resources, 2nd Edition, John Wiley & Sons, Hoboken, New Jersey, 1990. Google Scholar 
[13] 
C. Kelly and A. Rodkina, Constrained stability and instability of polynomial difference equations with statedependent noise, Discrete Contin. Dyn. Syst. B, 11 (2009), 913933. Google Scholar 
[14] 
E. Liz, How to control chaotic behaviour and population size with proportional feedback, Phys. Lett. A, 374 (2010), 725728. Google Scholar 
[15] 
E. Liz and A. RuizHerrera, The hydra effect, bubbles, and chaos in a simple discrete population model with constant effort harvesting, J. Math. Biol., 65 (2012), 9971016. Google Scholar 
[16] 
J. G. Milton and J. Bélair, Chaos, noise, and extinction in models of population growth, Theor. Popul. Biol., 37 (1990), 273290. Google Scholar 
[17] 
H. Seno, A paradox in discrete single species population dynamics with harvesting/thinning, Math. Biosci., 214 (2008), 6369. Google Scholar 
[18] 
L. Shaikhet, Optimal Control of Stochastic Difference Volterra Equations, An Introduction. Studies in Systems, Decision and Control 17, Springer, Cham, 2015. Google Scholar 
[19] 
A. N. Shiryaev, Probability, (2nd edition), Springer, Berlin, 1996. Google Scholar 
[20]  H. R. Thieme, Mathematics in Population Biology, Princeton University Press, Princeton, 2003. Google Scholar 
[21] 
E. F. Zipkin, C. E. Kraft, E. G. Cooch and P. J. Sullivan, When can efforts to control nuisance and invasive species backfire?, Ecological Applications, 19 (2009), 15851595. Google Scholar 
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