GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW) | ||||||
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10:48 May 29, 2015 |
English to Dutch translations [PRO] Tech/Engineering - Engineering (general) / installation of fans | |||||||
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| Selected response from: Henk Sanderson Netherlands Local time: 12:15 | ||||||
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Summary of answers provided | ||||
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4 -1 | schokbewegingen van het ventilatorwiel |
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4 -1 | kokertrillingen |
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Summary of reference entries provided | |||
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flutter |
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Discussion entries: 3 | |
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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. |
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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... |
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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 -------------------------------------------------- Note added at 12 hrs (2015-05-29 23:30:18 GMT) -------------------------------------------------- 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 |
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