NVH

CRITT M2A runs several outstanding NVH test facilities that are complementary to each other. Thanks to its close partnerships with experts, our centre provides a large range of measures, tests and solutions.

OUR SKILLS

 
• Measurement of acoustic insulation (ISO 10140 & ISO 717)
• Measurement of the absorption coefficient Alpha Sabine (ISO 354)
• Vibro acoustic maps
• Acoustic Power measurement/localization
• Failure detection (Vibration monitoring)
• Vibration and modal analysis
• Aerospatial tests under high acoustic pressure

 
• Pass by noise ISO 362-1 / ECE R51-03
• NVH characterization on e-Powertrain: engine, gearbox, réducteur...
• Turbocharger, exhaust line, valves, accessories
• Acoustic radiation
• Air line/aeraulic noises/ «inducts» measurements
• Transfer Path Analysis (TPA)

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OUR EQUIPMENTS

 
BANC E-POWERTRAIN FULL ANECHOIC
• 300 kW/1400 Nm/8000 rpm
• Background noise: 17 dB(A)
• Crossover frequency: 70 Hz

SEMI ANECHOIC CHAMBER WITH ROLLER TEST BENCH
• Volume: 410 m3
• Background noise: 15 dB(A)
• Crossover frequency: 70 Hz
• Vehicle speed up to 200 km/h (83 kW/3340 Nm per roller)

3 COUPLED REVERBERATING ROOMS
• Volume: 76 m3, 210 m3, 136 m3
• 1 room interfacing the semi-anechoic chamber

  

 
NOISE TEST TRACK
• Length 900 m
• Measurement area for pass by noise testings (ISO 10844)
• 26% slop

SPECIFIC EQUIPMENTS
• Laser vibrometer
• Shaker 98N without cooling
• Shaker up to 196N with air cooling
• Shaker 5kN with cooling by air
• Acoustic sources High Level
• Anechoic Endings
• Imaging
• Impact hammer