This library provides an Acoustical Domain for use with Simscape. This domain follows the conventions that have been used for decades with analog circuit models of acoustical systems. An early example of these methods is the book by Olsen (first edition published in 1943). A relevant current reference is Beranek and Mellow. These methods were initially used to model lumped parameter systems, systems that are analogous to simple RLC electrical circuits. Those lumped parameter components are included in the acoustical domain library. An example of the use of these simple components is a simple loudspeaker model. The current version of the acoustical library also includes components beyond the simple lumped elements. These include several kinds of acoustical transmission lines, piezoelectric pieces, and assemblies of simpler components such as approximate models radiation impedance and several models of moving coil speakers.
The Acoustical Domain uses the linear approximation for acoustic disturbances in the medium. It cannot deal with any phenomena that produce nonlinear behavior in the medium. For example, it cannot include effects such as
• cavitation in liquid media,
• nonlinear propagation at high pressure amplitudes in tubes.
The user is currently responsible for recognizing when these effects may be present, and to refrain from linear modeling in those cases.