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The second method of Liapunov is used to determine asymptotic stability of non-linear feedback control systems. The paper deals with second and third order control systems with hardspring characteristic as non-linear element and determines stability by simplified stability criteria from the development of Liapunov functions. The above systems have been simulated in an analogue computer and establish the results from stability criteria.The above Liapunov method fails in certain practical cases where the open loop transfer function of a control system has a pole at the origin. A pole shifting technique has been used in this paper to extend the applicability of the method.
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H. B. Mohanti (1965) studied this question.
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