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Glossary entry

français term or phrase:

arche

anglais translation:

peak (of a voltage or current sine waveform)

Added to glossary by Oliver Walter
Jun 30, 2011 22:06
12 yrs ago
1 viewer *
français term

arche

français vers anglais Technique / Génie Ingénierie : industriel inverter for induction heating
This is in the "notice de mise en oeuvre" of a "convertisseur de fréquence" that generates electrical energy at a few kHz for induction heating. One region of the display on the front of the housing shows information depending on whether it is "à la mise sous tension", "en mode fréquencemètre" or "en cas de défaut". In the fréquencemètre case, the display shows the frequency in kHz and a number labelled as "nbAr", displayed as a "Chiffre en hexadécimal" and defined as "Nombre d'arches Us en hexadécimal". Us (s=sortie) is the rms output voltage of the inverter (onduleur). I don't know what these "arches" are. The word does not occur anywhere else in the document.
Proposed translations (anglais)
2 +2 (sine) wave
3 +1 (voltage) peaks
4 (sinewave) hemicycle
Change log

Jul 3, 2011 21:43: Oliver Walter Created KOG entry

Discussion

Bourth (X) Jul 1, 2011:
I'm so glad you chaps understand this stuff!
mediamatrix (X) Jul 1, 2011:
@Oliver There is no rectifier in the system you describe, but the waveform of heating power has alternate hemicycles inverted (negative-going hemicycles become positive) because -1^2 =+1, in the same way as Chris has explained regarding full-wave rectification.
Oliver Walter (asker) Jul 1, 2011:
Not rectified Since "Le circuit de charge est un circuit oscillant du type parallèle" and operates at 3 kHz or in the range 8-10 kHz (model-dependent), it must be an unrectified sine-wave whose frequency is measured. This machine has a rectifier but that is used to convert the 3-phase mains input into d.c., which then drives the oscillator, and the core of the oscillator inductor provides the induction heating.
chris collister Jul 1, 2011:
Hexed? I would imagine the distinction between "chiffre" and "nombre" is simply due to the fact that hexadecimal requires the letters A to F in addition to the 10 digits 0 to 9.
Incidentally, absolute value of voltage is rarely (if ever) used for power, and is invariably proportional to the square (as noted by Didier) of the voltage. The square of a symmetrical (zero mean) wave is strictly positive, and twice the fundamental frequency.
Didier Fourcot Jul 1, 2011:
Inconsistent French? "nbAr" displayed as "Chiffre en hexadécimal" = "Nombre d'arches": "chiffre" is digit (0-9), "nombre" is number, this is like confusing a word and a letter.
"rms output" suggests that the writer is aware that the signal is not sinusoidal but a half-wave has the nice shape of an "arche" only for a sinus wave.
The reason to use these "arches" is that for the heating purpose of the device only the absolute value (or rather the square value for power) is relevant, but unless the very nature of the converter implies creating "arches" (truncated half-sines?), they should be "demi-ondes"
Tony M Jul 1, 2011:
Yes, in fact... the number of half-cycles in a given time period would of course give the frequency, so perhaps they just choose to express it in this rather odd way for some reason specific to their system; or as you say, simply the number of half-cycles over which the frequency was measured — perhaps the sinewave output is burst-fired, which would lead to an inaccurate frequency reading if a different measurement method were used. Or it could just be 'how many half-cycles there are in each burst', for example.
Oliver Walter (asker) Jun 30, 2011:
@Bourth Thanks for that suggestion - it sounds good. That could mean that the frequency was measured over the stated number (displayed in hexadecimal) of sinewave cycles (or half that number if both positive and negative peaks are "arches").

Proposed translations

+2
58 minutes
Selected

(sine) wave

I'm afraid I only know enough about electricty to quote the words at you ...

www.surechem.org/index.php?Action...docId... - Cached
est fournie à partir d'une batterie (42) associée à l'ONDULEUR (44), les ARCHES DE SINUSOÏDE de ces deux tensions (VI, V2) ayant des amplitudes sensiblement ...

www.invertershop.com.au/redarc-3000w-pure-sine-wave-inverte... - Cached
redarc 3000 Watt Pure SINE WAVE POWER INVERTER (6000W Surge) ... Input voltage, 12V, 24V. Output Voltage, 220 / 230 / 240V ± 3%. Frequency ...

en.wikipedia.org/wiki/Inverter_(electrical) - Cached
The output of a modified SINE WAVE INVERTER is similar to a square wave output ... A pure sine wave inverter produces a nearly perfect sine wave output (<3% ...


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Note added at 1 hr (2011-06-30 23:12:44 GMT)
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SINE WAVE INVERTER is widely used in many commercial and industrial applications including uninterruptable power supplies, INDUCTION HEATING, variable frequency drives, electrical vehicle drives and HVDC links.
http://www.pu.edu.pk/ceet/Pages/Prospectus.pdf
Peer comment(s):
agree Bashiqa
6 heures
agree Tony M : Probably half-cycles, if they're being counted, and would explain why they don't use 'cycles'
6 heures
Something went wrong...
3 KudoZ points awarded for this answer. Comment: "Thank you everybody for your contributions: all were useful. This one, from Bourth, was "the most helpful" because it was first and gave me a good idea of the meaning. I actually wrote "voltage peaks" - I think it probably counts 2 peaks per cycle (but possibly 1)."
+1
9 heures

(voltage) peaks

Whether a pure sine wave, or some other wave rich in harmonics, there will always be a "peak" or maximum value. If the sinusoidal output has been through a full-wave rectifier, then the number of peaks will be twice the fundamental frequency (this is why mains buzz is invariably at 100 Hz ( at least in Europe), and not the less audible hum at 50 Hz). "Arche" does sound nicely poetic, though.
Peer comment(s):
agree Didier Fourcot : This is my understanding also, as an inverter never has a pure sinus output, but an "arche" can be understood precisely ONLY for a sinus output, and should rather be "demi-onde"?
50 minutes
Something went wrong...
3 heures

(sinewave) hemicycle

The heating effect in these systems pulsates sinusoidally ollowing the supply waveform, but as if it were half-wave rectified since the positive and negative half-cycles of the supply both generate 'positive' heat. The sequence of half sine-waves looks a bit like the arches of the railway bridge under Charing Cross station.

[PDF] Functional Magnetic Resonance Image Analysis of a Large-Scale ... - [ Traducir esta página ]www-bmu.psychiatry.cam.ac.uk/sitewide/publications/.../bullmore96fun.pd...Similares
Formato de archivo: PDF/Adobe Acrobat
pure sine wave during the hemicycle of increased signal intensity, and will demonstrate an ''undershoot'' during the hemicycle of decreased signal intensity ...
MCW1B Magnetic Potentiometer - Detailed info for MCW1B Magnetic ... - [ Traducir esta página ]etrions.en.alibaba.com/.../MCW1B_Magnetic_Potentiomete... - En cachéHemicycle magnetic field generated by hemicycle permanent magnet is ... one cycle of similar triangular wave signal (or sine wave ) will be output from 2 ...
[PDF] 2 Energy Control S.R.L. / Product catalogue - [ Traducir esta página ]www.energycontrol.com.ar/datos/catalogo/catalogo_ingles1.pd... de archivo: PDF/Adobe Acrobat - Vista rápida
The stored elements of the capacitive system of “EC-Series” filters, supply the energy lost in the negative hemicycle, recomposing the sine wave. ...
Effects of Electrical Characters on Electrical Fatigue Behavior in ... - [ Traducir esta página ]www.scientific.net/KEM.280-283.159.pdfSimilares
sine wave electrical field (50Hz). Clearly, the higher the magnitude, the faster ... In a hemicycle, we define a time T, which is the time for the electric ...
[PDF] eeca-energywise-awards-entry-form-07 Top Notch Builders - [ Traducir esta página ]www.ecobob.co.nz/pdf/Dunedin-Eco-Home.pdfSimilares
Formato de archivo: PDF/Adobe Acrobat - Vista rápida
Wright's hemicycle houses. These were based around his concepts of. “Organic Architecture.” .... Voyager SEAP-24-1.7 sine-wave inverter. $2.670.00 ...
Theory and Design of Electrical and Electronic Circuits - [ Traducir esta página ]www.scribd.com/.../Theory-and-Design-of-Electrical-and-E... - En cachéThe diagram following sample the equivalence that has with a samplig, since (vc+ vm)# they are the hemicycles of sine wave vc changing their amplitude to the ...


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Note added at 14 hrs (2011-07-01 12:17:28 GMT)
--------------------------------------------------

Re Tony's comment below:
'half-cycle' refers generically to the time between any two points one half-wavelength apart, such as that from a positive peak to the next negative peak
hemi-cycle refers, specifically, to the case of half-cycles measured between zero-crossing points.
The 'arches' clearly refers to the latter, specific, case.
Peer comment(s):
neutral Tony M : Isn't the more usualy term 'half-cycle'? I can't say I've ever personally come across 'hemi-...' / Fair enough, though we do usually speak of e.g. the 'positive half-cycle', don't we?
4 heures
Please see note added above.
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