Automotive HVAC (heating/ventilation/air-conditioning) systems contribute to acoustic discomfort caused by high interior noise levels especially at extreme climate conditions. Progress in vehicle acoustics has lead to more NVH (noise/vibration/harshness) optimisation efforts on air handling devices. In this context, a number of test and analysis techniques are being employed at Visteon Product Development Climate in order to investigate noise and vibration problems. Four such techniques are exemplarily presented in this paper. Sound power determination by sound intensity method produces reliable results and is advantageous for comparative tests because it represents a characteristic of the sound source, but it needs large expense on equipment and time. Sound power can also be determined with the reverberation chamber method. A comparison of these methods is being outlined. The vibrational behaviour of air handling systems is investigated with experimental modal analysis and running mode analysis. The application of running mode analysis should be restricted to periodic vibration because interpretation and documentation is difficult in case of random vibration. Modal analysis, using shaker excitation in case of larger structures, is appropriate to identify structural resonance. Both techniques are applicable for air handling units.
Comparsion of experimental NVH analysis techniques on automotive HVAC systems
Vergleich experimenteller NVH (Lärm/Schwingungs-) Analysetechniken bei HVAC (Heizungs/Belüftungs/Klima-) Anlagen in PKW
2002
5 Seiten, 11 Bilder, 2 Quellen
Conference paper
English
Abtastfrequenz , akustische Eigenschaft , akustische Messmethode , Anregungsspektrum , Automobilbau , Blasluftzuführung , Experimentalanalyse , Fahrzeugausrüstung , Hallraum , Klimaanlage , Messen akustischer Größen , Modalanalyse , regellose Schwingung , Schalldruck , Schallintensität , Schallspektrum , Schwingungsverhalten
Comparison of experimental NVH analysis techniques on automotive HVAC systems
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