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Many thanks to all respondents for their helpful advice. Magnetweb is especially good !

Thanks to the respondents for their replies. There does seem to be a conflict between the comment by PREX and others however. My limited understanding was that, in a simple magnetic circuit (say a C-core with one air gap and one ferritic, permanent magnet), the permeability of the magnet and...

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...

Thanks to the above respondents. I think it confirms my suspicions that the only sensible route to solving this problem is the traditional one !

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...