May 20, 2009 21:56
15 yrs ago
1 viewer *
German term
Drehklanggrundton
German to English
Tech/Engineering
Construction / Civil Engineering
gas turbines
This appears in tender documents for the provision of noise protection measures.
Proposed translations
(English)
| 3 +1 | fundamental tone |
Kirsten Schulze
|
| 5 | blade pass(ing) frequency |
John Jory
|
| 3 | fundamental frequency of the rotational noise |
Sabine Akabayov, PhD
|
Proposed translations
+1
58 mins
Selected
fundamental tone
My first thought was that it's a typo and should read Dreiklang... but I think it refers to the sound the turbine produces when the rotor rotates, i.e. it's the "fundamental tone/sound of rotation or when rotating". If you google "fundamental tone" you get quite a few hits in the relevant field.
Peer comment(s):
| agree |
John Fenz
: http://tinyurl.com/pfyeo9
6 mins
|
| neutral |
John Jory
: Any non-German references, best with a calculation formula ??
13 days
|
4 KudoZ points awarded for this answer.
47 mins
Sabine Akabayov, PhD
Israel
Israel
Native in German
Israel
Scientist and Translator
Native in: German 
Works in: English to German, Hebrew to German, Latin to German, and 3 more.
Related KudoZ points
:
39
fundamental frequency of the rotational noise
http://books.google.com/books?id=99_004Seq0AC&pg=PA595&lpg=P...
http://books.google.com/books?id=SgZheyNeXJIC&pg=PA904&lpg=P...
http://books.google.com/books?id=SgZheyNeXJIC&pg=PA904&lpg=P...
23 hrs
blade pass(ing) frequency
"Beim Ventilator ist ein solches Störgeräusch als „Schaufelton“ oder
„Drehklang“ bekannt, seine Hauptstörfrequenz ergibt sich aus dem Produkt Schaufelzahl mal Drehzahl."
See www.tlt.de/dateien/83.pdf
"Blade Pass Frequency: This frequency is dependant on the total number of blades and calculated as follows :
Blade Passing Frequency = [(No. of blades x rpm) / 60] Hz
See www.paragfans.com/pdf/fan_noise_&_vibration.pdf
Note: There are considerably more hits for "blade passing frequency" + fan + blade than for "blade pass frequency" + fan + blade, and thousands more than for "fundamental tone" + fan +
blade.
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Note added at 13 days (2009-06-03 14:09:24 GMT) Post-grading
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Blade Passing Frequency
A potential vibration frequency on any bladed machine (turbine, axial compressor, fan, etc.). It is represented by the number of blades times shaft-rotating frequency.
See www.diracdelta.co.uk/science/source/b/l/blade passing frequency/source.html
„Drehklang“ bekannt, seine Hauptstörfrequenz ergibt sich aus dem Produkt Schaufelzahl mal Drehzahl."
See www.tlt.de/dateien/83.pdf
"Blade Pass Frequency: This frequency is dependant on the total number of blades and calculated as follows :
Blade Passing Frequency = [(No. of blades x rpm) / 60] Hz
See www.paragfans.com/pdf/fan_noise_&_vibration.pdf
Note: There are considerably more hits for "blade passing frequency" + fan + blade than for "blade pass frequency" + fan + blade, and thousands more than for "fundamental tone" + fan +
blade.
--------------------------------------------------
Note added at 13 days (2009-06-03 14:09:24 GMT) Post-grading
--------------------------------------------------
Blade Passing Frequency
A potential vibration frequency on any bladed machine (turbine, axial compressor, fan, etc.). It is represented by the number of blades times shaft-rotating frequency.
See www.diracdelta.co.uk/science/source/b/l/blade passing frequency/source.html
Peer comment(s):
| neutral |
Steffen Walter
: But can a "Ton" really be equated with a "Frequenz"?
52 mins
|
|
Natürlich. Jeder Ton ist eine Frequenz :-)
|
Reference comments
1 hr
Reference:
Fundamental tone vs. Fundamental Frequency
Two types of noise are generated by the cooling fan, **rotational noise** and vortex noise. 7 **Rotational noise** produces a **fundamental tone** and harmonics of that tone by the impulse of each blade as it passes through the air;
for symmetrically spaced blades, the **fundamental tone** is equal to the number of blades which pass a given point in a unit time.
**Fundamental frequency** (cps) fan rpm x no. of fan blades 6c The turbulent noises generated in a random pattern across a wide frequency range are the second group of noises.
for symmetrically spaced blades, the **fundamental tone** is equal to the number of blades which pass a given point in a unit time.
**Fundamental frequency** (cps) fan rpm x no. of fan blades 6c The turbulent noises generated in a random pattern across a wide frequency range are the second group of noises.
Example sentence:
Rotational noise produces a **fundamental tone** and harmonics of that tone by the impulse of each blade as it passes through the air;
Akaike et al., "**Rotational Noise** Analysis and Prediction for an Axial Fan with Unequal .... An important term in fan noise analysis is the **fundamental tone**,
Discussion