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Enquiries: NRC-IAR
Phone: 613-990-0765
1200 Montreal Road,
M-3
Ottawa,
Ontario,
K1A 0R6
Canada
Active Noise Control
IAR has developed expertise in the field of active noise control. The areas of activity include the use of reciprocal and direct techniques for the measurement of sound transmission through structures, vibro-acoustic modelling of structures, and active noise control using piezoelectric actuators.
Full-scale experiment on active noise control
Activities in active noise control are focused on noise reduction in aircraft. Experiments are underway on a full-scale aircraft fuselage to verify computer models developed for predicting both open and closed loop sound pressure levels in an aircraft cabin. In the experiments, control algorithms, including adaptive schemes, are implemented in real time using discrete time compensator models and a PC with an analog I/O data acquisition and control board.
The use of piezoelectric actuators allows for a reduction in both acoustic noise and structural vibration. Research and development work with Canadian industry has been ongoing for a number of years in the area of noise transmission and control for turboprop aircraft with such collaborators as de Havilland. Plans are underway for a flight test verification.
Active Noise Control Equipment:
- Zonic 7000 multi-channel data acquisition and analysis system
- HP 3565S multi-channel data acquisition and analysis system
- Bruel and Kjaer 2032 analyzer
- Bruel and Kjaer 2133 analyzer
- Spectrum QPC40 Quad DSP and I/O boards
- Metrabyte DAS-16F data acquisition and control board
- Ling LMT-100 shaker
- Electrodyne AV50 shaker
- Accelerometers and charge amplifiers
- Force transducers
- Microphones and measuring amplifiers
- LMS Modal analysis software
- Matlab software
- Mathematical software
- Various sound sources
