GRAS Sound & Vibration
GRAS Sound & Vibration is located in Denmark and founded by the Danish acoustics pioneer, Gunnar Rasmussen, who for more than 60 years has contributed to the world of sound and vibration with his unique ideas and designs.
Since the establishment in 1994, GRAS has been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. We work with everyone with an interest in sound or noise within the fields of automotive, aerospace, audiology, consumer electronics, noise monitoring, building acoustics and telecommunications.
Valid data and efficient test methods have always been important in acoustic noise, vibration and harshness (NVH) testing. However, with new types of cars – electric, hybrid, autonomous – posing new challenges and calling for new, informed and clever trade-off decisions, this is more true than ever before.
As the world leader in developing cutting-edge acoustic sensors, GRAS provides new and improved microphones for more efficient and reliable acoustic NVH testing. This includes a rugged and very versatile standard microphone for a wide variety of acoustic NVH applications as well as highly specialized microphones for very specific applications.
The two most recent specialized microphones are GRAS 147AX CCP Rugged Pressure Microphone – a new surface microphone optimized for cold and hot engine noise testing and GRAS 147EB CCP X-Rugged Microphone Set – a microphone optimized for on-road brake noise testing. Both meet the constraints typically found in engine bay and wheelhouse testing.
With these two new additions to its new generation of microphones already comprising the 146AE standard microphone, GRAS offers a portfolio of microphones covering all application areas within automotive NVH testing.
146AE – The New Standard Microphone
For powertrain noise, road noise, exhaust noise, pass-by noise and brake noise dynamometer testing.
GRAS’ versatile solution is the 146AE – the world’s first CCP free-field measurement microphone set specifically designed to operate reliably in many different harsh NVH test setups. The 146AE sets a new standard, which provides valid acoustic data and ruggedness in one package.
Already used by +25 OEM and Tier 1 customers globally.
147AX – Special Microphone for Engine Noise Testing
GRAS’ new solution is the 147AX microphone (patent pending) optimized to withstand the challenging conditions found in an engine bay. The new form factor and unique mounting system allow measurements in confined spaces and enable easy mounting. Developed and tested with Volvo Cars, Sweden.
147EB – Special Microphone for Brake Noise On-Road Testing
GRAS’ new solution is the 147EB rugged measurement microphone with additional protection of the diaphragm. It can withstand many thousands of miles of driving in all weather conditions. In addition, it can provide valid acoustic data that it has not been possible to record before. Developed and tested with major Tier 1 customer.
For more information, please see Acoustic Sensors for Premium Data