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General expression

In this section we will derive the general equations resulting from matching the acoustic pressure and velocity fields on the air shared at a discontinuous join between two tubes of differing cross-sectional area. The geometry we are considering is shown in figure B.1.

**Figure B.1:** *Detail of a waveguide consisting of straight sections of length joined discontinuously*
$\begin{figure}\begin{center} \epsfig{figure=chapter2/disc.eps, width=5cm} \end{center}\end{figure}$

Subsections

Pressure
Volume velocity

Jonathan Kemp 2003-03-24