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Plasma wind tunnel testing

Watch the first simulated re-entry of a full-sized spacecraft in a plasma wind tunnel as the The Scirocco facility tests the Qarman cubesat.

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18 July, 2018



Sonic boom acoustic tests

This video, from a NASA Social event at Armstrong Flight Research Center, shows an F/A-18 producing a regular sonic boom at 0:43 and and then a low “boom” by performing the dive maneuver at 02:34. NASA researchers are preparing for public tests of technology designed to reduce the noise of sonic booms

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03 July, 2018



Autonomous vehicles explained

Safran’s SimplyFly! light hearted series of video’s takes on autonomous vehicles - how will they work and what are the main challenges? Learn more about the topic by watching this video.

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20 June, 2018



 

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With Airbus' Zephyr drone pushing the limits of aviation to reach an altitude of 74,000ft in the stratosphere during test flights, we would like to ask - where do you think the atmosphere ends and space begins?

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GRAS Sound & Vibration A/S

GRAS Sound & Vibration A/S
Skovlytoften 33 – 2840 Holte - Denmark

Email: gras@gras.dk
Web: http://www.gras.dk
Tel: +45 4566 4046

G.R.A.S. 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 everybody with an interest in sound or noise within the fields of aerospace, automotive, audiology, consumer electronics, noise monitoring, building acoustics and telecommunications.

 
The rugged microphone from GRAS, 146AE – is the world’s only measurement microphone set that is shock resistant, waterproof, dust and oil mist resistant and able to withstand high temperatures – all without compromising measurement quality.

The 146AE is designed specifically for the demands of aerospace testing and can perform accurately and durably under extreme test conditions time and time again. This minimizes costly re-testing and rescheduling, providing efficiency, valid data and high performance all at the same.

GRAS has focused on ensuring that the 146AE performs in real-life conditions such as strong vibrations, drop, extreme temperatures and water or dust.

 

 


Built for extreme conditions:

  • Shock and drop resistant – limited downtime and higher efficiency
  • Water, oil and dust-proof (IP67 Rated) – withstands rain, high humidity and oil mist
  • Dust, water and high-speed particle protected with a replaceable grid – change the filter not the microphone
  • Can be used at high temperatures (125°C) – ideal for engine compartment measurements, transmissions, exhaust and brake noise tests
  • PowerOn Indicator – efficient control of your measurement set-up
  • Online data – ensure valid data with access to electronic calibration data for your system software
  • Repairable diaphragm – low cost on repairs


Precise data every time

  • Frequency range and dynamic range as you know it from IEC compatible ½” measurement microphones:
  • 3.15Hz – 20kHz, 18dB(A) – 138dB, 50mV/Pa
  • 5 year warranty

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