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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Silencer for Series C Comet
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<blockquote data-quote="Matty" data-source="post: 32638" data-attributes="member: 1339"><p>Hi Peter</p><p></p><p>Befoire I retired I was at some time an Electronic/Electrical research Engineer and as part of my studies had to do lots of hard sums associated with waveguide design - the principles of which can also (if you are clever enough ) be applied to the resonances and matching characteristics of exhaust systems.</p><p></p><p>These days the designers of exhaust systems, I am sure, use all sorts of fancy fluid dynamics software to optimise their sytems as do the designers of waveguides for the transmission of electromagnetic energy. Extra bits of pipe are called stubs in the electronic world and their lengths can be calculated to produce all sorts of matching and transmitting resonanace effects - though silencers are pretty tricky to analyse mathematically because they have baffles etc. which ruin the purity of the maths and complicate the sums a great deal.</p><p></p><p>So I am sure that the extra bit of pipe will change the characteristics of the exhaust systems from singles to twins and that the cross pipe could act as a matching stub if it had the right dimensions.</p><p></p><p>I think however that exhaust pipe/silencer design is more of a black art than waveguides because the latter are of very accurate dimensions, therefore easier to analyse and hopefully the megawatts of electrical energy do not get out of the sides of the waveguide, whereas quite a lot of noise escapes through the casing of a silencer.</p><p></p><p>Sorry I don't think any of this will help much with our Comet problem, but may help to explain why twins are quieter than singles on some bikes and the cross pipe might effect the niose.</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 32638, member: 1339"] Hi Peter Befoire I retired I was at some time an Electronic/Electrical research Engineer and as part of my studies had to do lots of hard sums associated with waveguide design - the principles of which can also (if you are clever enough ) be applied to the resonances and matching characteristics of exhaust systems. These days the designers of exhaust systems, I am sure, use all sorts of fancy fluid dynamics software to optimise their sytems as do the designers of waveguides for the transmission of electromagnetic energy. Extra bits of pipe are called stubs in the electronic world and their lengths can be calculated to produce all sorts of matching and transmitting resonanace effects - though silencers are pretty tricky to analyse mathematically because they have baffles etc. which ruin the purity of the maths and complicate the sums a great deal. So I am sure that the extra bit of pipe will change the characteristics of the exhaust systems from singles to twins and that the cross pipe could act as a matching stub if it had the right dimensions. I think however that exhaust pipe/silencer design is more of a black art than waveguides because the latter are of very accurate dimensions, therefore easier to analyse and hopefully the megawatts of electrical energy do not get out of the sides of the waveguide, whereas quite a lot of noise escapes through the casing of a silencer. Sorry I don't think any of this will help much with our Comet problem, but may help to explain why twins are quieter than singles on some bikes and the cross pipe might effect the niose. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Silencer for Series C Comet
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