http://www.k-wave.org/forum/topic/incident-sound-intensity-on-a-infinite-rigid-wall-with-an-opening Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:53:19 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/incident-sound-intensity-on-a-infinite-rigid-wall-with-an-opening#post-3838 Fri, 02 Aug 2013 09:46:32 +0000 bencox 3838@http://www.k-wave.org/forum/ <p>Hi mary_homes, </p> <p>Presumably it is a diffraction effect, as the wave will diffract at the opening. Does the jump occur at a wavelength related to the opening size? I wouldn't immediately know where to look it up, I'm afraid, but it sounds like a classical result that would be in one of the old textbooks. You could test it in k-Wave to see if you can see why it happens. I hope you find a clear explanation!</p> <p>Ben </p> http://www.k-wave.org/forum/topic/incident-sound-intensity-on-a-infinite-rigid-wall-with-an-opening#post-3834 Tue, 30 Jul 2013 12:48:30 +0000 mary_homes 3834@http://www.k-wave.org/forum/ <p>Dear acousticians,</p> <p>I have a question which is a bit general and maybe not specific to the k-wave software, but definitely something for acoustic people.</p> <p>My question is whether it is logic that a plane wave, incident from an infinite air medium onto a rigid wall with an opening of 1.5m by 1m (nothing is in the opening, after the opening there is a again an infinite air medium - rigid wall separates the full space), results in a non-constant incident intensity level curve measured and averaged over the opening. I am wondering some time now why this is not constant? I thougth that the intensity and power in a plane wave are constant i.e. that is what I understood from my acoustics class.</p> <p>The non-constant intensity profile is as follows : a constant intensity level of around 55dB for plane waves from 10 - 70Hz. Around 80Hz a sudden increase happens in the intensity values till around 100 Hz till a level of 85dB is reached. Hereafter the 85 dB remains more or less constant till 1000 Hz. For these simulations a 1Pa amplitude pressure sine waves is taken for the whole frequency range.</p> <p>I would be very grateful I someone could give me more insight why this is so,.... </p>