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Related Experiment Videos

Active noise control using a distributed mode flat panel loudspeaker.

H Zhu1, R Rajamani, J Dudney

  • 1Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.

ISA Transactions
|July 16, 2003
PubMed
Summary
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Flat panel distributed mode loudspeakers (DML) show promise for active noise control (ANC). Feedforward control with DMLs effectively reduces sound pressure levels and can block sound transmission, offering new ANC possibilities.

Area of Science:

  • Acoustics
  • Signal Processing
  • Loudspeaker Technology

Background:

  • Flat panel distributed mode loudspeakers (DMLs) offer advantages in weight, size, and durability over traditional cone speakers.
  • The complex and uneven frequency response of DMLs raises questions about their suitability for active noise control (ANC).

Purpose of the Study:

  • To experimentally evaluate the effectiveness of DML speakers in ANC applications.
  • To compare feedback and feedforward control techniques for DML-based ANC.
  • To develop and assess a new feedback control algorithm for tonal noise attenuation using DMLs.

Main Methods:

  • Experimental investigation of DML speakers in both feedback and feedforward ANC configurations.
  • Development of a novel feedback control algorithm for narrow-band tonal noise.

Related Experiment Videos

  • Evaluation of feedforward control for sound pressure level reduction and sound transmission blocking.

    • Main Results:

    • Feedback control, even with a new algorithm, showed only moderate effectiveness for narrow-band tonal noise due to DML uneven response.
    • Feedforward control demonstrated significant sound pressure level reduction near an error microphone.
    • A novel application of DMLs was shown, using feedforward control to block sound transmission by placing the panel in the sound path.

    Conclusions:

    • Feedforward control is the most capable technique for DML-based ANC.
    • DMLs enable a new proactive ANC approach by blocking sound transmission before it enters an enclosure.
    • The findings suggest DMLs can expand the scope of noise control applications.