Experimental study on controlling vibration of singlespan rotor using multiple dynamic vibration absorbers
                                                             DING Jichao, HE Lidong, JI Peiyao, CHEN Zhao
(Beijing Key Laboratory of Health Monitoring and Selfrecovery for High end Mechanical Equipment,Beijing University of Chemical Technology, Beijing 100029, China)

Abstract: Aiming at the problem of rotor vibration in largescale rotating machinery, the critical vibration of the rotor and the research on the damping of common rotor faults were studied, especially the use of dynamic vibration absorbers to study the damping principle and damping effect of the rotor system was designed. Multiple semiactive dynamic vibration absorbers were built, and a singlespan test bench was built. The rationality of the experimental bench parameters was severed by simulation software, a fourfold dynamic vibration absorber with four natural frequencies was designed, and the critical vibration control experiment of the rotor system was conducted. A firstorder critical vibration experiment for suppressing the rotor by switching control was conducted, and a comparative experiment for a multiple dynamic vibration absorber and a dual dynamic vibration absorber was established. The research results show that the switchcontrolled dynamic vibration absorber can control the vibration of the whole rotor in a smaller range, solve the problem of new formant and can effectively broaden the limited vibration absorption band, and the vibration reduction effect of the quadruple dynamic vibration absorber is more than 4% higher than double dynamic vibration absorbers. At the same time, rotor vibration can be effectively controlled in its entire operating frequency band.

Key words: multiple dynamic vibration absorber; rotor system; semiactive control