Changgen Bu (C. G. Bu) received the Ph.D. degree, the M.S. degree all in mechanical engineering from China University of Geosciences. He joined China University of Geosciences (Beijing) in 1987, where he is currently a full professor and doctoral supervisor in the school of engineering and technology. Professor Bu is the recipient of the first prize of Anhui Science and Technology Award in 2015. His research interests focus on mechatronic system design, mechanical dynamics with shock and vibration, and diamond tool brazing technology and its thermodynamics. In recent years, Professor Bu has received funding from NSFC, CGS, and other sources. As the principal investigator of the NSFC project, he has conducted the front theory in the transient contact/impact dynamic problem of down-the-hole (DTH) hammer. The resonant theory of the DTH hammer drilling hard rock coupling with short drill string is established and has been applied to the dynamic problem of sonic/ultrasonic drill string successfully. The theoretical framework for the standing wave vibration of the sonic drill string is proposed for the first time, demystifying the mechanism of sonic/ultrasonic drill chasing rock and the theory of fatigue damage of drill string. At present, he is developing a new platform to model and analyze the nonlinearity in the drill string dynamical systems using the domain decomposition method and the potential energy functional minimization method.