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Frequency of single cylinder engine?
Hello - I'm trying to build an enclosure for an engine driven air
compressor. It is run by a single cylinder Kohler engine. I would like to know how to calculate the frequencies of the engine to figure out how much quieter it will be if I enclose it in certain materials. Supposedly the amount of noise that a material will block depends on the frequency of the sound. Higher pitched noises are easier to block than lower bass-like noises? Is this correct? What would a typical engine frequency be - would it be equal to the RPMs? As far as the enclosure from what I've read, I want to have it airtight as possible (I will need intake and exhaust tubes/hoses and access areas), isolated from anything structural (I am thinking of rolling it onto rubber mat (polynorbonene? - that rubber like substance that audiophiles use to mount turntables and other equipment on)) and having as much mass to the walls of the enclosure as possible (two to four layers of drywall) Am I going about this properly? Thanks, Brett |
#2
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"Brett" wrote in news:1128968356.732089.284030
@g47g2000cwa.googlegroups.com: Hello - I'm trying to build an enclosure for an engine driven air compressor. It is run by a single cylinder Kohler engine. [snip] As far as the enclosure from what I've read, I want to have it airtight as possible [snip] Am I going about this properly? I assume that your Kohler engine is air cooled, which means you can't just put it into a sealed enclosure -- it nees some serious airflow for cooling purposes. In addition, long pipe runs for intakes and exhaust will affect the engine's efficiency, and potentially make it unusable. |
#3
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"Brett" wrote in message
oups.com Hello - I'm trying to build an enclosure for an engine driven air compressor. It is run by a single cylinder Kohler engine. I would like to know how to calculate the frequencies of the engine to figure out how much quieter it will be if I enclose it in certain materials. Supposedly the amount of noise that a material will block depends on the frequency of the sound. Higher pitched noises are easier to block than lower bass-like noises? As a rule, yes. What would a typical engine frequency be - would it be equal to the RPMs? The primary exhaust frequency of a 1 cylinder, 4 stroke engine is the rpm divided by 2, because its a 4-stroke engine, and then divided by 60, because you want Hz instead of strokes per minute. For example, the 4-stroke, 1-cylinder engine may run at 3600 rpm. That gives a primary exhaust frequency of 1800 pulses per minute or 30 Hz. Note that the primary source of noise in an engine is the exhaust, so an improved muffler can work wonders. Then there is intake noise. Finally, there's noise that is transmitted through the engine block. I'd like to echo other poster's concerns about cooling and safety. |
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