Assessing Low Frequency Flow Noise Based on an Experimentally Validated Modal Substructuring Strategy Featuring Non-Conforming Grids

Rafael Englmann, Christoph Gabriel, Florian Toth, Manfred Kaltenbacher

Research output: Contribution to journalConference articlepeer-review


The continuous encouragement of lightweight design in modern vehicles demands a reliable and efficient method to predict and ameliorate the interior acoustic comfort for passengers. Due to considerable psychological effects on stress and concentration, the low frequency contribution plays a vital rule regarding interior noise perception. Apart other contributors, low frequency noise can be induced by transient aerodynamic excitation and the related structural vibrations. Assessing this disturbance requires the reliable simulation of the complex multi-physical mechanisms involved, such as transient aerodynamics, structural dynamics and acoustics. The domain of structural dynamics is particularly sensitive regarding the modelling of attachments restraining the vibrational behaviour of incorporated membrane-like structures. In a later development stage, when prototypes are available, it is therefore desirable to replace or update purely numerical models with experimental data. To this end, an original strategy has therefore been developed to estimate the vibro-acoustic response due to aerodynamic excitation based on a modal coupling approach. The incorporated acoustic and structural modes can be obtained either from numerical models or through experimental modal analysis. The presented work begins with the principles of modal vibro-acoustic substructuring and the practical workflow employed. Its applicability is demonstrated by an experimentally validated automotive structure subject to transient aerodynamic load.

Original languageEnglish
JournalSAE Technical Papers
Issue number2022-01-0939
Publication statusPublished - 2022
Event12th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference - Graz, Graz, Austria
Duration: 22 Jun 202224 Jun 2022

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering
  • Automotive Engineering


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