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A gearbox is used to transfer power from an engine to its associated wheels or cogs, which can result in radiating noise to the surroundings. This is due to the transmission of undesired lateral and axial forces on the bearings and housing, while transmitting power from one shaft to the other, as well as the vibrations of flexible components, such as the gear meshes, bearings, and housing. By simulating and predicting the vibration and noise radiation from a gearbox, designers can gain insight early in the design process.

This tutorial illustrates the modeling of vibration and noise in a 5-speed synchromesh gearbox of a manual-transmission vehicle. A transient multibody analysis is performed to compute the gearbox vibration for the specified engine speed and external load. The normal acceleration of the gearbox housing is converted to the frequency domain and used as a source of noise. An acoustics analysis is then performed in order to compute the sound pressure levels in the near, far, and exterior fields.

Learn more about this tutorial model in a related blog post: "How to Model Gearbox Vibration and Noise in COMSOL Multiphysics®".