Describing Road Booming Noise with a Hybrid Simulation Model Using a Time Segmentation of the Excitation Load Approach

Abstract

One of the most important goals in vehicle acoustics is to describe the NVH behavior of a vehicle at sound pressure level using simulation models at an early stage of development. Different simulation models and methods are used for this purpose. To balance the advantages and disadvantages of the different methods, it is important to combine the simulation models. For the virtual description of the road booming noise behavior of a vehicle passing a rough road, we use a multibody simulation model excited with the elevation profile of the road in the time domain. To calculate the sound pressure inside the vehicle, the internal chassis forces of the multibody simulation model are combined with a finite element body model including the air cavity inside the cabin. The methodology for combining the chassis forces and body transfer functions to calculate the sound pressure is first validated using test data and then applied to the simulation data. The correlation of the calculated sound pressure based on test data (ρ=0.96) and based on simulation data (ρ=0.90) compared to a microphone measurement is very high.

Strategies for Reducing Booming Noise Generated by the Tailgate of an Electric Sport Utility Vehicle

“…Wu et al [11] applied a similar analysis method to investigate the cause of booming noise arising from the chassis pitch mode induced by the engine's rotational component, which was attributed to excessive suspension energy through the fifth torsional mode of the drivetrain, and conducted research to address this issue. Herrmann et al [12] developed predictive models for noise improvement by combining the chassis and interior acoustic models. These models were based on simulated road profiles from which sound pressure data were extracted and validated using experimental data.…”

“…Additionally, our research facilitated the investigation of booming noise by creating a finite-element model of the tailgate during the preliminary design stage, a step before the finalization of the entire model. While previous research emphasized the necessity of models for pre-analyzing booming noise [12], most studies attempted problem analysis by interpreting finite-element models encompassing the entire vehicle and tailgate [8,12,24,25]. Although modeling methods that target the entire completed system have the advantage of precision, they consume a significant amount of time and resources.…”