How do exhaust baffles work?
Answers:
They are acoustically tuned chambers that are designed to cancel out (or filter) the noise created by the engine. The pulses that come from the engine exhaust are within a fixed range and the design tries to filter as many of these frequencies as possible.
Look up acoustic low pass filter or Helmholtz filter (or resonator)and you should be able to get some info in more detail.
This is similar to the low pass filters that are used in electronics.
They slow the exhaust and allow it to expand inside the muffler before exiting the tailpipe.
It is effectivetly sound proofing
A car exhaust is a long pipe with often a centre box and rear box placed inline of the pipe. These boxes are much larger than the pipe and consist of several dividers within the box with holes in them (some round, some oval shape depending on design). These dividers are called baffles and they're basically there to slow down and quieten the sound of the escaping exhaust gases.
Hope that helps?
The sound waves bounce around in there and get absorbed. Like putting furniture in an empty room. Lots of echo when it's empty. But when the furniture is in it absorbs sound saves. Some recording studios have baffles on the walls - in the old days anyway. Probably, use more modern materials now. It's a little like sending the sound waves through a maze.
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