Noise, Vibration, Harshness (NVH) – Targeted reduction of Vibrations and Noise

Unwanted vibrations and noise rarely occur where one would expect them to. We analyse the vibroacoustic paths of your system – from structure-borne sound to radiation behaviour and airborne sound – and identify the components that are genuinely critical with respect to resonance or tonality. This allows effective mitigation measures to be derived long before quality, efficiency or yield are compromised.

CASE STUDY

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This case study shows how Wölfel used NVH simulations, material characterization and FEM analyses to investigate the vibration and noise behaviour of a generator housing in detail. The combination of measurement and simulation revealed which excitation modes shape the tonal NVH behaviour – and where structural damping is most effective.

By specifically optimizing the generator structure and using damping-effective sandwich sheets, the equivalent sound power could be reduced by up to 10 dB. The result illustrates how simulation-based NVH analyses enable an effective reduction of radiated noise.

CASE STUDY

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During the NVH pre-design phase, it became evident early on how strongly the stiffness of the support interface influences noise and vibration transmission within the vessel.
The analysis clearly showed that the initial design overlapped with key excitation frequencies, thereby promoting unnecessary noise levels. 

Variants with reduced stiffness shifted the natural frequencies accordingly and lowered the transmitted forces in the critical range by up to 10 dB. In this way, a robust concept for a quieter, more comfortable and reliably isolated propulsion system was established even before the first prototype was built.

Our services in the field of NVH

  • Structure-borne sound and structural analysis
    We examine how vibrations propagate within the system, where they are amplified, and which components act as primary radiators.
  • Identification of tonalities and resonance locations
    Tonalities often arise from structural couplings or operating frequencies – we make these mechanisms visible and assessable.
  • Virtual evaluation of design variants
    We compare design variants and their NVH effects – faster and more cost-efficient than any prototype iteration.
  • Derivation of effective mitigation measures
    Stiffness adjustments, dampers, decoupling measures or operating parameters: we define which modification actually delivers an effect.
  • Airborne sound and radiation behaviour
    If required, we also simulate the airborne sound radiation, calculate sound pressure levels at reference points and assess the influence on the overall sound level.
  • Consideration of real operating parameters
    Whether rotational speed, load, run-up or part-load operation: we analyse the behaviour where NVH issues actually occur – not only under ideal conditions.

PLEASE CONTACT ME PERSONALLY

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I am happy to support you with numerical simulations and advise you on the development, optimization and automation of your simulation processes.

Frederic Priesack

+49 (931) 49708 - 282
Priesack@woelfel.de
Contact form

Study

Mechanical Engineering / Energy Engineering

Academic Degree

Master of Science

Professional Motto

Great work comes from having fun doing it.

Working at Wölfel

A supportive environment, exciting responsibilities, excellent opportunities for development – and a company that leads by example and drives innovation.