Needs Pictures: 0
Results 46 to 46 of 46
-
14th February 2021, 05:31 PM #46.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,756
Here are few noise spectra of my setup.
Refer only to the solid purple vertical bars the purple line is some sort of max value, but that is affected by where I hold the mobile and my handling, bumping etc of mobile
Where there is a blip around the 7-8kHz mark on some screen shots that's seems to be cause by my fingers pushing the mobile phone screen capture buttons.
Baseline noise inside shed - nothing on.
Average is <40dB
Shedbachground.jpg
Inside shed right next to the WW lathe BMH - yes its pretty noisy, the air "hiss" means it's sucking a lot of air.
An this is why I have to wear muffs when turning
BMHnoise.jpg
The next one down is the spectrum with the mobile in middle of doorway of external DC enclosure with enclosure door open.
Even with the door open this spectrum is likely to be significantly modified by acoustic insulation inside the enclosure.
When outside the enclosure this DC averages about 87dB @ 1m @50Hz
InsideDCenc.jpg
Outside DC enclosure- averages about 65db @1m and @50Hz
OutsideDCenclosure.jpg
Major frequencies are possibly 50Hz motor rumble, and number of impeller vanes x 50 or ~400Hz.
The one thing that this does not take into account is ear sensitivity to frequency.
1kHz is where most people are most sensitive but it can be different for many people.
-
14th February 2021 05:31 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
Similar Threads
-
My dust collection journey.
By Flintlock in forum DUST EXTRACTIONReplies: 32Last Post: 11th December 2019, 08:23 PM -
My dust extraction journey begins here.
By Smarty90 in forum DUST EXTRACTIONReplies: 6Last Post: 23rd March 2017, 10:40 PM -
Not quite dust extraction......rathermore hot air extraction....
By FenceFurniture in forum DUST EXTRACTIONReplies: 23Last Post: 13th May 2014, 10:40 AM -
dust extraction
By Tonyz in forum DUST EXTRACTIONReplies: 6Last Post: 4th August 2007, 10:35 AM -
Dust Extraction
By barnsey in forum DUST EXTRACTIONReplies: 27Last Post: 3rd June 2003, 07:58 AM