Zharilkassin Iskakov, PhD, full professor, two-time holder of the title and state grant “The best teacher of the University of the Republic of Kazakhstan”, Honorary Worker of Education, holder of the Badge of Merit for the development of science of the Republic of Kazakhstan, higher education, graduated from Korkyt Ata Kyzylorda State University with a red diploma (with honors), GPA: 3.6/4. He worked at this university as an associate professor, head of the educational department, head of the department, and he became an associate professor at the Daukeev Almaty University of Power Engineering and Telecommunications. Currently, he is the head of the scientific laboratory of the Laboratory of Nonlinear Dynamics of Gyroscopic Rotary Machines of the Joldasbekov Institute Mechanics and Engineering. Iskakov Zh. is a Corresponding Member of the International Teacher’s Training Academy of Science and Fellow Contributor of International Science Community Association. The subject of study is Resonant Oscillations of an Unbalanced Rotor with Nonlinear Characteristics; Nonlinear Oscillations of Mechanical system with Non-ideal Energy source.