Browse Publications Technical Papers 2019-01-1560
2019-06-05

CAE Methods for Predicting Radiated Noise From Large Diameter Single-Piece Aluminum Propeller Shafts With Liner Treatments 2019-01-1560

In recent truck applications, single-piece large-diameter propshafts, in lieu of two-piece propshafts, have become more prevalent to reduce cost and mass. These large-diameter props, however, amplify driveline radiated noise. The challenge presented is to optimize prop shaft modal tuning to achieve acceptable radiated noise levels. This paper will cover the development of a two-step CAE method to predict modal characteristics and airborne noise sensitivities of large-diameter single piece aluminum propshafts fitted with different liner treatments. The first step is the use of a traditional CAE software to calculate prop surface response. The second step is a boundary element simulation to calculate prop surface radiating noise under the excitation obtained from the first step. Finally, test data, acceleration and acoustic, in both subsystem and vehicle levels are presented to assess the accuracy of the CAE method. The new CAE method can dramatically benefit driveline N&V integration, such as prop liner selection or prop modes tuning to reduce the driveline noise.

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