Question about Hemlholtz Chambers
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From: Nah man, Yemen
Question about Hemlholtz Chambers
I read about these a little while back, but am still a little unclear on the design/use of them. I'm getting a custom axle back made so I can interchange from street to race when I need to, and am planning on including one on the back section. My question is, are they simply just a piece of pipe that's capped off to help dissipate the sound, or is there something else within it that makes it "special?"
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From: Chandler, AZ, USA
Re: Question about Hemlholtz Chambers (SoCal EJ1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoCal EJ1 »</TD></TR><TR><TD CLASS="quote">I read about these a little while back, but am still a little unclear on the design/use of them. I'm getting a custom axle back made so I can interchange from street to race when I need to, and am planning on including one on the back section. My question is, are they simply just a piece of pipe that's capped off to help dissipate the sound, or is there something else within it that makes it "special?"</TD></TR></TABLE>
I'm not an expert on this, but my understanding is that the Helmholtz chambers are normally used on the intake, not on the exhaust. On the exhaust, there's typically something called a "resonator" which really is basically another muffler; it's an enlarged section with a perforated pipe on the inside, and some type of absorbent material between the pipe and the outside part to absorb sound.
The Helmholtz chambers you refer to are typically seen on factory intake systems. They're just big, empty containers attached to the intake tubing. They work through a principle of acoustic resonance, much like the way ported subwoofers work in audio. The resonator holds a certain volume of air, and is tuned to a certain frequency to match the engine and its typical RPM range. Ported subwoofers are tuned to a certain frequency, so that they make the subwoofer sound louder through resonance; the Helmholtz chambers make the intake sound quieter by cancelling out the sound waves, instead of adding to them like the subwoofer.
Here's a Wikipedia page about it: http://en.wikipedia.org/wiki/Helmholtz_resonator
I'm not an expert on this, but my understanding is that the Helmholtz chambers are normally used on the intake, not on the exhaust. On the exhaust, there's typically something called a "resonator" which really is basically another muffler; it's an enlarged section with a perforated pipe on the inside, and some type of absorbent material between the pipe and the outside part to absorb sound.
The Helmholtz chambers you refer to are typically seen on factory intake systems. They're just big, empty containers attached to the intake tubing. They work through a principle of acoustic resonance, much like the way ported subwoofers work in audio. The resonator holds a certain volume of air, and is tuned to a certain frequency to match the engine and its typical RPM range. Ported subwoofers are tuned to a certain frequency, so that they make the subwoofer sound louder through resonance; the Helmholtz chambers make the intake sound quieter by cancelling out the sound waves, instead of adding to them like the subwoofer.
Here's a Wikipedia page about it: http://en.wikipedia.org/wiki/Helmholtz_resonator
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