Vibro-Acoustic Analysis for Modeling Propeller Shaft Liner Material

Rajith R. Jayaratne; Yu Liu; Mark Gehringer; Jeff Rayce; Wallace Hill

doi:10.4271/2019-01-1560

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. Historically, CAE methods and capabilities have not been able to accurately predict propshaft airborne noise making it impossible to cascade subsystem noise requirements needed to achieve desired vehicle level performance. As a result, late and costly changes can be needed to make a given vehicle commercially acceptable for N&V performance prior to launch.

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 radiated noise under the excitation obtained from the first step. Finally, acceleration and acoustic test data 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 mode tuning to reduce the driveline noise.

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Vibro-Acoustic Analysis for Modeling Propeller Shaft Liner Material 2019-01-1560

SAE MOBILUS