throat flutter

Dutch translation: kokertrillingen

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:throat flutter
Dutch translation:kokertrillingen
Entered by: Bram Poldervaart

10:48 May 29, 2015
English to Dutch translations [PRO]
Tech/Engineering - Engineering (general) / installation of fans
English term or phrase: throat flutter
THROAT FLUTTER
Any fan that is effectively moving air at the tips of the blades will develop a reduced pressure area (or suction) on the fan throat or ring at the tip of the blade.
This suction tends to draw the throat toward the tip of each blade, which means that a four blade fan would tend to draw the throat into something approaching a square while a six blade fan would draw it into something resembling a hexagon, etc. Since the fan is rotating, the effect on the throat is that of continually drawing it into a rotating polygon.
The resulting throat flutter is frequently mistaken for fan unbalance.
Bram Poldervaart
Local time: 12:15
kokertrillingen
Explanation:
Het gaat om trillingen van de koker (het huis) waarbinnen de bladen van de ventilator draaien. De brontekst beschrijft heel precies hoe de koker steeds door zuiging naar de uiteinden van de waaierbladen wordt getrokken.
Selected response from:

Henk Sanderson
Netherlands
Local time: 12:15
Grading comment
dank je
4 KudoZ points were awarded for this answer



Summary of answers provided
4 -1schokbewegingen van het ventilatorwiel
golf264
4 -1kokertrillingen
Henk Sanderson
Summary of reference entries provided
flutter
Barend van Zadelhoff

Discussion entries: 3





  

Answers


3 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
schokbewegingen van het ventilatorwiel


Explanation:
Mijn vorig antwoord was niet geheel accuraat. Want het gaat hier om de schokbewegingen van het ventilatorwiel/rotor in reactie op de toenemende instabiliteit van de luchttoevoer.

golf264
United States
Local time: 07:15
Works in field
Native speaker of: Native in EnglishEnglish, Native in DutchDutch
PRO pts in category: 4

Peer comments on this answer (and responses from the answerer)
disagree  Henk Sanderson: En met dit antwoord sla je de plank ook geheel mis//en als je vindt dat mijn antwoord hetzelfde is als je eigen antwoord, desavoueer je daarmee ook je eigen antwoord - grappig
1 hr
  -> Het antwoord van jou is juist hetzelfde, alleen heb je een draai gegeven aan de gekozen woorden
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4 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
kokertrillingen


Explanation:
Het gaat om trillingen van de koker (het huis) waarbinnen de bladen van de ventilator draaien. De brontekst beschrijft heel precies hoe de koker steeds door zuiging naar de uiteinden van de waaierbladen wordt getrokken.


    Reference: http://www.induvac.com/producten/ventilator/axiaal-ventilato...
Henk Sanderson
Netherlands
Local time: 12:15
Specializes in field
Native speaker of: Dutch
PRO pts in category: 183
Grading comment
dank je

Peer comments on this answer (and responses from the answerer)
disagree  golf264: Je zegt precies hetzelfde als ik, maar dan met iets gewijzigde woorden, dus als de mijne fout is, moet de jouwe ook fout zijn als gevolg van je eigen logica
11 mins
  -> Zie discussie
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Reference comments


12 hrs
Reference: flutter

Reference information:
Ik verbaasde me erover dat die 'throat' zou kunnen 'flutteren'.

Niet geheel onterecht:

3.3.6 THROAT FLUTTER
Any fan that is effectively moving air at the tips of the blades will develop a reduced pressure area (or suction) on the fan throat or ring at the tip of the blade. This suction tends to draw the throat toward the tip of each blade, which means that a four blade fan would tend to draw the throat into something approaching a square while a six blade fan would draw it into something resembling a hexagon, etc. Since the fan is rotating, the effect on the throat is that of continually drawing it into a rotating polygon. The resulting throat flutter is frequently mistaken for fan unbalance.

A substantial throat or ring will be sufficiently rigid that flutter will not exist. A weak or flexible throat, particularly when used with a fan of a low number of blades, will be greatly affected by this type of vibration. Throat flutter is easily detected due to the fact that it is invariably of a frequency of the fan RPM times the number of blades on the fan.
Throat flutter will cause no damage to the fan so long as the throat does not disintegrate and fall into the fan blades. It may be eliminated by stiffening or bracing the throat. If in doubt that throat flutter is the cause of vibration, reduce the angle of the blades until the fan is doing little or no work. If the vibration ceases under this condition, it is certain that throat flutter is present when the blades are loaded.

http://www.moorefans.com/pdfs/TMC_647P_.PDF

http://www.moorefans.com/

http://www.moorefans.com/5000.html

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Note added at 12 hrs (2015-05-29 23:30:18 GMT)
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throat flutter appearance = a rotating polygon (square, hexagon, etc.)

throat flutter frequency = fan RPM x number of blades

--> visueel iets van een vierkant, zeshoek, etc die met een frequentie van rpm x 4, rpm x 6, etc ronddraait

Barend van Zadelhoff
Netherlands
Native speaker of: Native in DutchDutch
PRO pts in category: 56
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