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kifuyu@gmail.com
science forum beginner
Joined: 16 May 2005
Posts: 11
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 Posted: Thu Sep 29, 2005 10:05 am Post subject:
Compressor 2x noise
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Hello Everyone...
| Quote: | From FFT analysis, it is known that 2x (twice of rotating
speed)frequency noise is very dominant for centrifugal compressor. |
This component is over 10dB than other frequency components.
But how can 2x frequency noise component can be possible in centrifugal
compressor?
Can exhaust components be such noise source? |
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Greg Locock
science forum Guru Wannabe
Joined: 28 May 2005
Posts: 111
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| Posted: Fri Sep 30, 2005 10:21 am Post subject:
Re: Compressor 2x noise
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"kifuyu@gmail.com" <kifuyu@gmail.com> wrote in
news:1127995533.426978.281280@g49g2000cwa.googlegroups.com:
| Quote: | Hello Everyone...
From FFT analysis, it is known that 2x (twice of rotating
speed)frequency noise is very dominant for centrifugal compressor.
This component is over 10dB than other frequency components.
But how can 2x frequency noise component can be possible in
centrifugal compressor?
Can exhaust components be such noise source?
Bear in mind that most noise and vibration problems can be reduced to |
excitation*response = output.
There is a good chance that you have aresonance near the frequency of
concern.
Cheers
Greg Locock |
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Grunties
science forum beginner
Joined: 02 Oct 2005
Posts: 3
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| Posted: Sun Oct 02, 2005 7:17 pm Post subject:
Re: Compressor 2x noise
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Greg Locock <greglocock@yahoo.com.au> wrote in
news:Xns96E1E3665EC5977777777777777777777@211.29.133.50:
| Quote: | "kifuyu@gmail.com" <kifuyu@gmail.com> wrote in
news:1127995533.426978.281280@g49g2000cwa.googlegroups.com:
Hello Everyone...
From FFT analysis, it is known that 2x (twice of rotating
speed)frequency noise is very dominant for centrifugal compressor.
This component is over 10dB than other frequency components.
But how can 2x frequency noise component can be possible in
centrifugal compressor?
Can exhaust components be such noise source?
Bear in mind that most noise and vibration problems can be reduced to
excitation*response = output.
There is a good chance that you have aresonance near the frequency of
concern.
Cheers
Greg Locock
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What kind of compressor is he dealing with? |
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kifuyu@gmail.com
science forum beginner
Joined: 16 May 2005
Posts: 11
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| Posted: Mon Oct 10, 2005 5:52 am Post subject:
Re: Compressor 2x noise
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Centrifugal type Compressor
No gear...
Rotated by permanent magnetic type rotor...controlled by inverter.
Supported by air foil bearing
1 and 2 stage compression at 1 rotor. |
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