Hey everybody, I’m DJ Smith and I’ve got another quick tip in CadnaA for you. All right, so one of the first questions I get from new users is, “How do you set up a point source?” There’s a lot of different ways we could do this, but I’ll show you the simplest way right now. We can go over to the CadnaA toolbox and click our point source symbol. The cursor changes to have the point source icon next to it. From here, we can click to drop point sources into our model. We can also use the number pad to input the coordinates of our point source. All we have to do is start typing on the number pad.
In this case, I’ll make the coordinates 50 50. Click OK, and the point source appears. Okay. So now the point source is placed where we want it to be. What we can do now is double click on it and open up the point sources editing window. We can give it a name and an ID. By default, the point source type is set to single band at 500 hertz. We can change this by adjusting the value. We can also change the type by clicking on this drop-down, selecting spectrum and we can go to this text field to give the point source a sound power value. So let’s say 100dB across the entire spectrum.
So, let’s say you wanted to give this sound source a spectrum that is a little bit more complex than
just 100dB. Well, if you click this folder icon, you’ll open up the local sound level library. Close out of this and hold down shift and click the folder icon again. We open up the global sound level library. We can talk about the exact differences between these two libraries in another video. To apply one of these spectrums from either library to the point source, all you have to do is select one. Maybe we’ll pick this one here, the wire rolling mill, and click OK. The ID for that sound spectrum is applied in this text field and the spectrum has been applied to the point source. So all that would be left to do now in this very very simple model is to make sure that the height is set to the right value. You can do that in the geometry window. And if that’s set, click OK and OK again. And then you’re ready to calculate.
Thank you so much for watching this Tips and Echoes video. If you enjoyed it, please like and follow. Leave a comment for any other questions that you have or
anything else that you want to see. Until then, happy modeling. Thank you very much. Bye-bye.
CadnaA is state-of-the-art software for modeling, calculation, and assessment of environmental noise. It can be used efficiently at any scale, from a few single receivers in a neighborhood to noise mapping projects of entire countries. This works for various source types such as roads, railways, aircraft, or industrial noise. Scantek is the exclusive distributor in the US for DataKustik software products.
