Active control of pulsating flows in transitory conditions

• Published in: The Journal of the Acoustical Society of America 1999-02, Vol.105 (2_Supplement), p.1090-1090
• Main Authors: Tartarin, J., Carimantran, F.
• Format: Article
• Language: English
• ISSN: 0001-4966; 1520-8524
• DOI: 10.1121/1.425109

The active control in a duct in the presence of hot and/or corrosive gasses (e.g., exhaust system) or even heavy fluids (oil, fuel, water,...) needs an actuator that is particularly resistant. That’s why the LEA designed an original auxiliary source [Hardouin et al., Acta Acustica 1, 189–198 (1993)]: an oscillating flap which acts in a flow as an aeroacoustic source. Its high efficiency in very low frequencies associated with its little bulk is also another major interest. For active control, because it is a source connected in series with the primary source, an online identification is preferable for better adaptive character. Therefore specific algorithms were developed in frequency domain for command strategies of feedback synchronous type. Other time-frequency domain algorithms were implemented. In view of industrial applications, these different algorithms were experimentally compared, particularly in transitory conditions. Jointly, simulations were led to allow the development and the optimization of exhaust mufflers including the flap and passive devices.