Amrita Puri

TL;DR: It is found that the noise reduction obtained using the modal based approach is close to the maximum possible but at a lower computational cost.

TL;DR: In this article, the modal secondary paths are identified using experimentally identified physical secondary paths and acoustic mode shapes, and the acoustic mode amplitudes of the acoustic modes are identified on the basis of acoustic pressure measurements from eight microphones suitably placed throughout the cavity.

TL;DR: Development of a global active noise control method based on virtual sensing of the acoustic potential energy in the cavity under the presence of structural and acoustic disturbances is presented and minimisation of the estimatedoustic potential energy through a feedforward control law is developed.

TL;DR: In this paper, a normalized FxLMS algorithm, in which the convergence coefficient is normalized with the power of the filtered reference signal, is proposed to deal with this situation, and the proposed method leads to a faster convergence which results in higher noise reduction especially when the frequency of noise varies continuously.

TL;DR: The development of a feedforward technique for active noise control in vibro-acoustic cavities ensuring that the noise reduction does not lead to an increase in kinetic energy is presented.