Dynamics of a generalized Rayleigh system

TL;DR

This paper analyzes the global dynamics of a generalized Rayleigh system, proving the existence of a unique limit cycle for non-zero parameter values, with applications in modeling chemical processes involving heat transfer.

Contribution

It characterizes the global behavior of the generalized Rayleigh system and establishes the existence of a unique limit cycle when the parameter is non-zero.

Findings

Existence of a unique limit cycle for a ≠ 0

Global dynamics characterized for the system

Application to modeling heat effects in chemical processes

Abstract

Consider the first order differential system given by \begin{equation*} \begin{array}{l} \dot{x}= y, \qquad \dot{y}= -x+a(1-y^{2n})y, \end{array} \end{equation*} where $a$ is a real parameter and the dots denote derivatives with respect to the time $t$. Such system is known as the generalized Rayleigh system and it appears, for instance, in the modeling of diabetic chemical processes through a constant area duct, where the effect of adding or rejecting heat is considered. In this paper we characterize the global dynamics of this generalized Rayleigh system. In particular we prove the existence of a unique limit cycle when the parameter $a\ne 0$.