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The fastener failures at different parts have diverse influences on the outputs of rotor systems. However, little research about this has been reported yet. Thus, the influences of various fastener failures on rotor outputs are investigated in this paper. According to the different failure behaviors, we divide the fasteners into three types. Considering that the immediate result of a fastener failure is to cause the fastened parts loosening, the looseness is considered as the fastener failure mode. The failure models of the three kinds of fasteners are established by the lumped mass method. By the numerical simulation, the outputs of the system under different failures are acquired. Moreover, to reveal the influences of the failure degree on the rotor system, the outputs of the system with different looseness are studied. The investigation in this paper disclosed the characteristics of different fastener failures, which is helpful for failure locating and failure diagnosing. Furthermore, this work also provides the theoretical foundations for the mechanism researches of the machine failures caused by fastener faults.

Effects of Fastener Failure at Different Parts on Rotor Systems Outputs