An efficient time-domain approach for coupled multibody-vibroacoustic simulations with stationary sound-radiating components

Abstract

The accurate prediction of noise emissions from mechanical systems with moving flexible bodies is crucial for a wide range of engineering applications. This study introduces a novel time-domain methodology for simulating systems where components with significant rigid body motion excite vibrations in stationary components, which in turn radiate sound Traditional approaches, which couple time-domain flexible multibody dynamic simulations with frequency-domain vibroacoustic simulations, are often limited by high computational costs, complexity in handling transient phenomena, and cumbersome workflows. Our methodology addresses these challenges by integrating high-order finite element methods for transient acoustics with flexible infinite elements for modeling non-reflecting condition. These modeling techniques are combined with Krylov model order reduction, offering significant improvements in computational efficiency. The introduction of an efficient time-domain vibroacoustic model within this methodology allows to develop a unified multibody-vibroacoustic formulation that integrates multibody dynamics and vibroacoustic simulations into a single solver, greatly simplifying the modeling process. This novel formulation is validated with a simplified gearbox model and an academic test case featuring large-amplitude motion. Moreover, the performance of the newly introduced time-domain methodology is benchmarked against the traditional frequency-domain approach for simulating the noise radiated from a higher-fidelity gearbox model. The results from these numerical tests underscore the efficiency of the proposed method.

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ORCID for S. van Ophem: orcid.org/0000-0003-1050-7318

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