Noise, Vibration, Harshness
Noise, vibration, and harshness (NVH): Customer satisfaction is the key word. Developing silent products with low vibration levels is a joint task for simulation and test.
Full-field vibration measurement for modal analysis and acoustic optimization is lifted to a higher level with Scanning Vibrometry:
- reactionless measurements
- high spatial resolution
- CAE integration
- up to 90% testing time reduction with large project
Scanning Vibrometry solves NVH tasks quickly and straight forward!
NVH often deals with lightweight structures. If contact transducers are involved e.g. in Experimental Modal Analysis the influence of the sensor mass has to be taken into account.
Optical sensing is reactionless. Mass loading is thus no issue in optical vibration sensing. Especially when probing lightweight structures in aerospace and automotive full field scanning vibrometry delivers unambiguous results. The verification of Finite Element Models in a model updating process delivers better results, if transfer functions and mode shapes are measured uninfluenced.
Watch our video podcast for more details and examples.
Polytec Scanning Vibrometers unveil sources of sound radiation quantiativly and with high spatial definition. Inverse panel contribution measurements and qualification of damping materials are quickly performed by the automatic scanning process. Impressive 3D visualization speeds up troubleshooting and provides documentation for decision making.
For the correlations with structural dynamic and acoustic simultation models virbometer's high fidelity data provide just the right basis, especially with their capablity to work with geometries derived from FEM and CAD input.
Lightweight vehicles benefit from a test based damping material placement. Only critical surfaces with a high contribution to the interior sound receive treatment with dampling material layers.
Scanning Vibrometry delivers quatitative data with high spatial resolution resolving hotspots in footpan, firewall or transmission tunnel. This surface velocity data is used to guide direcly placement stategies or as an input for acoustic simulation.
The benefit of a test based strategy is up to 40% weight reduction in critical areas.
Read more in the January 2014 issue of the Sound & Vibration Magazin