My understanding is that the relative permeability of rare earth magnets is almost unity. This would mean that, in simple permanent magnetic circuit analysis, you would need to consider the thickness of the magnet as well as the thickness of the air-gap when calculating the circuit flux.
Is...
I hope someone can offer some pointers on simple design rules for mufflers. I have not come across many good books on the subject - those that I have found tend to be either in-depth acoustic theory or on very 'broad-brush' noise control.
I wish to attenuate combustion noise in small burners...
