Some Sufficiency Criteria for Hurwitz Stability of Real Polynomials
It is pointed out that some new sufficient conditions for Hurwitz stability of real polynomials are obtainable as an immediate consequence of combining certain known sufficient conditions. The targeted polynomials are those of degree more than or equal to five, for which exact analytical stability conditions are practically un available due to their intricate forms. In contrast, the obtained conditions simply comprise a set of quadratic inequalities and a pair of cubic ones with respect to the polynomial coefficients. The results are expected to make up for the pausity of existent sufficiency criteria for Hurwitz stability of polynomials.