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The Taipei Metro is one of the major transportation systems in the Taipei area. Noticeable noise and vibration caught attention during the train turning on a rail with a large angle. The initial investigation indicates the noise occurs between the slewing ring bearing and the friction sets which are located between the body and chassis systems. A study was conducted to identify the root causes. A lab test to duplicate the reported problem observed on the train was established, and a set of experiments were performed in the lab to identify the root causes. Under certain contact conditions, unsmooth turning would occur and cause the noise and vibration. To further identify and understand the root causes. An ADAMS multibody dynamic model which included the slew bearing and friction set was build to perform the train turn motion, and to verify the lab test. Different friction materials were also included in the simulation.

A noticeable noise and vibration occurred when the Mass Rapid Train turned on a rail with a large turning angle. A study was performed to investigate the source of the noise and vibration, to find the root causes, and to discuss the corrective actions to improve the issue. The investigation indicates the noise occurs between the slewing ring bearing and the friction sets. The slewing ring bearing is located between the body and chassis systems. It provides a relative rotation between the body and chassis. The friction sets provide friction forces to prevent abrupt movements and to help to stabilize the relative motions between the body and chassis systems. The study shows under certain contact conditions unsmooth turning would occur and cause the noise and vibration. A corrective action was suggested to improve the condition.