A convolution model intended to predict the far-field directivity of a planar parametric loudspeaker array (PLA), consisting of a rectangular arrangement of piezoelectric transducers (PZTs), has been recently proposed. In this work the model is further developed to deal with PZTs set in curved surfaces. An expression is first given to compute the audible secondary pressure field generated by a PZT placed at any point and pointing at any direction in space. Then, assuming weak non-linearity, the total audible pressure produced by the whole curved PLA is recovered by means of the superposition principle. As an application, a design for constructing an omnidirectional parametric array consisting of hundreds of PZTs set on a sphere is proposed. A critical point is that of finding an appropriate distribution of PZTs on the spherical surface. Some possibilities are analyzed like addressing the Fekete problem, or resorting to an equal-area partitioning approach. The advantages and drawbacks of those options are analyzed based on simulations and possible construction constraints.
|Estat de la publicació||Publicada - 2017|
|Esdeveniment||46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong, China|
Durada: 27 d’ag. 2017 → 30 d’ag. 2017
|Conferència||46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017|
|Període||27/08/17 → 30/08/17|