The Qualitative Research Of A Class Of Automous General System Of Liénard Type

In this paper, on the basis of the qualitative research about different generalized Lienard systems of many authors,we consider the qualitative behaviour of a more general system of Lienard typeby using comparison principles and Poincare qualitative theories, from the point of view of uniform ultimate boundedness, periodicity, oscillation of the solutions and its center. Some sufficient or sufficient and necessary- conditions are presented for different questions. Some examples illustrating our results are given in this paper.