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The robust selection of the transducer positions for Active Noise Control (ANC) inside a cabin van

 

Teresa Bravo María

 

The PhD work focused on the design and the physical implementation of an Active Noise Control (ANC) system inside a vehicle. In particular, the main objective was to find the optimal microphone and loudspeaker positions for the engine noise cancellation inside the cabin. To investigate the relation between performance and transducer positions, an analytical description in terms of the enclosure normal modes has been used. The optimization has been performed for two different situations: in laboratory conditions, within an enclosure with similar dimensions to a plane, and inside a cabin van. The expected active cancellation has been calculated using a set of experimental transfer functions between all the microphone-loudspeaker couples, and the primary field measured by the error sensors. The selection of the optimal positions is a nonlinear optimization problem that may require the use of natural algorithms under certain circumstances. In this work, the best transducer combinations have been selected considering not only the cancellation performance, but their robustness to varying working conditions, using the simulating annealing algorithm. In this way, the ANC system will maintain the nominal performance against perturbations that may appear during the working life of the vehicle. Finally, the prototype developed that provides the best results with a minimum number of transducers has been installed in the van and tested under normally driving conditions.

ANC system inside the van and detail of the loudspeakers on the roof and the microphones on the seat headrests

GAA

Actividades de I+D

  • The robust selection of the transducer positions for Active Noise Control (ANC) inside a cabin van
  • Variability of low frequency sound transmission measurements
  • The design of active headrests for personal audio
  • Laboratory reproduction of random pressure fields
  • Spatial properties of reverberant sound fields using microphone array beamforming
  • In-duct acoustic source strengths reconstruction by inverse methods
  • Modelling the near field to far field propagation of noise radiated by vehicles
  • Sound absorption and transmission through microperforated-panel structures
Acoustics and Non Destructive Evaluation (DAEND)
  • Environmental Acoustics (GAA)
  • G Carma: Materials Characterization by Non Destructive Evaluation
  • ULAB, Ultrasounds for Liquid Analysis and Bioengineering
Information and Communication Technologies (TIC)
  • Cybersecurity and Privacy Protection Research Group (GiCP)
  • Research group on Cryptology and Information Security (GiCSI)
    • Quantum Communications Laboratory (LCQE)
  • Multichannel Ultrasonic Signal Processing Group (MUSP)
Sensors and Ultrasonic Systems (DSSU)
  • Ultrasonic Systems and Technologies (USTG)
  • Nanosensors and Smart Systems (NoySi)
  • Ultrasonic Resonators for cavitation and micromanipulation (RESULT)
  • Advanced Sensor Technology (SENSAVAN)
  • Quantum Electronics (QE)
Laboratorios
  • Laboratorio de Acústica
  • Laboratorio de Metrología Ultrasónica Médica (LMUM)
  • Laboratorio de Comunicaciones Cuánticas
  • Laboratory for International Collaboration in Advanced Biophotonics Imaging

Instituto de Tecnologías Físicas y de la Información Leonardo Torres Quevedo  - ITEFI
C/ Serrano, 144. 28006 - Madrid • Tel.: (+34) 91 561 88 06  Contacto  •  Intranet
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