Acoustic Sensors for NVH Testing

NVH Challenges Valid data and efficient test methods have always been important in acoustic noise, vibration and harshness (NVH) testing in the automotive industry. Today, this need is ever increasing as a reflection of the rapidly changing automotive market. OEMs are constantly pushing for shorter time to market, and together with the shift towards non-combustion engine vehicles – especially electric and hybrid – the demand for higher testing efficiency, improved test methods, and more reliable data has never been greater. In essence, NVH departments and facilities are experiencing new testing...

NEW NVH Solutions from GRAS CHALLENGES / ENGINE NOISE TESTING Engine noise testing includes acoustic transfer function (ATF) determination. Most widely used is the reciprocity method with a high number of free-field, standard ½“ microphones fixed to the engine with glue, adhesive tape or mounted on a tripod. This method is cumbersome and very time-consuming, and because the setup is difficult to reproduce, the accuracy of the results is limited. GRAS’ new solution is the 147AX microphone (patent pending) optimized to withstand the challenging conditions found in an engine bay. The new form factor...

GRAS NVH Application Overview Pass-by Noise Brake Noise Road Noise Engine Noise Vehicle Interior Noise Powertrain Noise Buzz, Squeak and Rattle Noise Exhaust Noise Wind Noise 146AE

Acoustic Sensors for NVH Brake Noise 147EB. A rugged microphone with extra protection for on-road testing in all climate zones and weather conditions. 146AE is the perfect choice for test bench testing. Engine Noise 147AX. A rugged surface microphone with an ingenious mounting system for repeatable cold and hot engine testing – also on the proving ground. Powertrain Noise 146AE. A rugged and versatile microphone thoroughly protected for maximum performance in conditions with shock, dirt and moisture. Suitable for powertrain noise testing. Exhaust Noise 40SC is a probe microphone for measurements...

GRAS Worldwide GRAS SOUND & VIBRATION A/S Skovlytoften 33 2840 Holte Denmark Tel: +45 4566 4046 www.gras.dk [email protected] GRAS SOUND & VIBRATION USA 2234 East Enterprise Parkway Twinsburg, OH 44087 United States Tel: +1 330 425 1201 www.gras.us [email protected] GRAS SOUND & VIBRATION UK Building 115 Bedford Technology Park Thurleigh, MK44 2YA Bedford United Kingdom Tel: +44 1234 639552 www.gras.co.uk [email protected] About GRAS Sound & Vibration GRAS is a worldwide leader in the sound and vibration industry. We develop and manufacture state-of-the-art measurement microphones to industries where acoustic...