Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-05T16:54:39.470Z Has data issue: false hasContentIssue false

Forced oscillations of the feedback control equation

Published online by Cambridge University Press:  14 February 2012

Russell A. Smith
Affiliation:
Department of Mathematics, University of Durham

Synopsis

Schaefer's fixed-point theorem is used to obtain sufficient conditions for the existence of a periodic solution of the non-linear differential equation f(D)x+BMg(D)x = p. The most significant feature of these conditions is a geometrical restriction on the range of the matrix M which is the same as the elliptic ball criterion encountered in stability theory. The extension of the results to delay-differential equations with constant time lags is also discussed.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1976

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1Benes, V. E. and Sandberg, I. W.. Applications of a theorem of Dubrovskii to the periodic responses of nonlinear systems. Bell System Tech. J. 43 (1964), 28552872.CrossRefGoogle Scholar
2Dieudonné, J.. Foundations of modern analysis (New York: Academic Press, 1969).Google Scholar
3Ezeilo, J. O. C.. A further result on the existence of periodic solutions of the equation ẍ+aẍ+bẋ+h(x) = p(t, x, ẋ, ẍ). Math. Proc. Cambridge Philos. Soc. 77 (1975), 547551.CrossRefGoogle Scholar
4Jakubovič, V. A.. The method of matrix inequalities in the theory of stability of non-linear control systems, I (Russian). Avtomat. i Telemeh. 25 (1964), 10171029.Google Scholar
5Jakubovič, V. A.. A certain class of nonlinear differential equations for which stability in the large and instability questions can be solved effectively (Russian). Dokl. Akad. Nauk SSSR 186 (1969), 10271030, translated Soviet Math. Dokl. 10 (1969), 720–723.Google Scholar
6Leonov, G. A.. A certain class of nonlinear differential equations for which the questions of the existence of bounded and periodic solutions may be solved effectively (Russian). Vestnik Leningrad. Univ. Mat. Meh. Astronom. 4 (1972), 2932.Google Scholar
7Reissig, R.. An extension of Ezeilo's result. Ann. Mat. Pura Appl. 92 (1972), 119209.Google Scholar
8Smart, D. R.. Fixed point theorems (Cambridge: University Press, 1974). Cambridge tract No. 66.Google Scholar
9Smith, R. A.. Absolute stability of certain differential equations. J. London Math. Soc. 7 (1973) 203210.Google Scholar
10Smith, R. A.. On the elliptic ball stability criterion for ordinary differential equations. Proc. Cambridge Philos. Soc. 74 (1973), 497505.CrossRefGoogle Scholar
11Smith, R. A.. Inclusion conditions for Hurwitzian and Schur sets in Cn+1. Math. Proc. Cambridge Philos. Soc., to appear.Google Scholar