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Stability and Response of Systems Satisfying a Second-Order Linear Differential Equation with Time-Dependent Coefficients

Published online by Cambridge University Press:  07 June 2016

A. W. Babister
A. W. Babister*
Affiliation:
The University, Glasgow
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Summary

The differential equation considered is

where all the a’s and b’s are real constants.

The nature of the solution is investigated in the neighbourhood of the singular point and the conditions are found for logarithmic terms to be absent.

The conditions for stability for large values of τ are determined; the system is stable if

are all positive for large values of τ.

The form of the response is considered and its oscillatory (or non-oscillatory) nature investigated. The Sonin-Polya theorem is used to determine simple inequalities which must hold between the coefficients of the differential equation in any interval for the relative maxima of | x | to form an increasing or decreasing sequence in that interval.

Type
Research Article
Information
Aeronautical Quarterly , Volume 8 , Issue 1 , February 1957 , pp. 78 - 86
Copyright
Copyright © Royal Aeronautical Society. 1957

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References

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