Geodesic
Application of self-adjoint boundary value problems to investigation of stability of periodic delay systems
Trudy Instituta matematiki i mehaniki, Control, stability, and inverse problems of dynamics, Tome 12 (2006) no. 2, pp. 78-87

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The problem on determining conditions for the asymptotic stability of linear periodic delay systems is considered. Solving this problem, we use the function space of states. Conditions for the asymptotic stability are determined in terms of the spectrum of the monodromy operator. To find the spectrum, we construct a special boundary value problem for ordinary differential equations. The motion of eigenvalues of this problem is studied as the parameter changes. Conditions of the stability of the linear periodic delay system change when an eigenvalue of the boundary value problem intersects the circumference of the unit disk. We assume that, at this moment, the boundary value problem is self-adjoint. Sufficient coefficient conditions for the asymptotic stability of linear periodic delay systems are given. 
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     author = {Yu. F. Dolgii},
     title = {Application of self-adjoint boundary value problems to investigation of stability of periodic delay systems},
     journal = {Trudy Instituta matematiki i mehaniki},
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     url = {http://geodesic.mathdoc.fr/item/TIMM_2006_12_2_a6/}
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Yu. F. Dolgii. Application of self-adjoint boundary value problems to investigation of stability of periodic delay systems. Trudy Instituta matematiki i mehaniki, Control, stability, and inverse problems of dynamics, Tome 12 (2006) no. 2, pp. 78-87. http://geodesic.mathdoc.fr/item/TIMM_2006_12_2_a6/