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Post by orienteer on Dec 19, 2011 16:07:11 GMT
On a Jubilee train today, heard a sound I haven't noticed before. When braking and while stationary, a steady (but not continuous) hissing sound.
Car 96424 if anyone is interested!
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Deleted
Deleted Member
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Post by Deleted on Dec 19, 2011 16:15:42 GMT
The beginnings of a future air burst maybe? We wait and see!!
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Post by jardine01 on Dec 19, 2011 17:23:27 GMT
This is what happens when you have full braking! It won't be long before they turn like the 1992 stock for unreliablity. A sound sometimes when moving off on some trains the motors don't sound healthy!
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rincew1nd
Administrator
Junior Under-wizzard of quiz
Posts: 10,246 
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Post by rincew1nd on Dec 19, 2011 19:19:58 GMT
Sounds like some kind of pneumatic suspension pre-tensioning. I've noticed this on other 'modern' stock when a large number of people get off, the last time I remember was on the ELL at Canada Water.
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Deleted
Deleted Member
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Post by Deleted on Dec 20, 2011 17:31:49 GMT
Why is it that the 96 stock has such a distinctive acceleration noise?
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Post by jardine01 on Dec 20, 2011 18:56:56 GMT
The GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings I think this makes the sound of Acceleration noise on the 1996 stock.
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Post by chrisvandenkieboom on Dec 20, 2011 21:16:25 GMT
And the similar Class 465 Networker, of course.
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Ben
fotopic... whats that?
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Post by Ben on Dec 20, 2011 21:53:13 GMT
The GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings...  |
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Post by t697 on Dec 20, 2011 22:15:49 GMT
Sounds like some kind of pneumatic suspension pre-tensioning. I've noticed this on other 'modern' stock when a large number of people get off, the last time I remember was on the ELL at Canada Water. The Jubilee line 96TS don't have air suspension so it won't be the suspension. Northern line 95TS do have air suspension. |
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Post by eurostarengineer on Dec 21, 2011 15:01:39 GMT
Sounds like some kind of pneumatic suspension pre-tensioning. I've noticed this on other 'modern' stock when a large number of people get off, the last time I remember was on the ELL at Canada Water. You're talking about Levelling Valves....... The GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings I think this makes the sound of Acceleration noise on the 1996 stock. If you can honestly say that you knew this without looking it up, then you should be able to tell me what happens to the 3rd Harmonic with Power Factor Correction. |
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Deleted
Deleted Member
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Post by Deleted on Dec 21, 2011 17:21:35 GMT
The GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings I think this makes the sound of Acceleration noise on the 1996 stock. If you can honestly say that you knew this without looking it up, then you should be able to tell me what happens to the 3rd Harmonic with Power Factor Correction. Jardine01 is a 15 year old boy who's enthusiasm for the Jubilee Line is expressed to great effect on this forum and good luck to him for it. As a result, the fact that he's cut and pasted wholesale a section from the Wiki entry for 1996 Stock isn't that important. As his "crime" was so blatantly funny I'd give him a little slack instead of asking him a technical question you know full well he probably won't be able to answer. Much better he engages here than hanging about street corners eh? Who knows, in 7 years time if he applies himself he may well be where you are today, or maybe, with the way the world is going, even your boss! |
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Post by jardine01 on Dec 21, 2011 20:58:42 GMT
Whistlekiller this comment is bang out of order am only 15 but i do know things about trains and i knew that GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings i have known that.
Next time if you have not thing nice to say DONT SAY IT AT ALL!
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Post by Tubeboy on Dec 21, 2011 21:21:16 GMT
Whistlekiller was sticking up for you Jardine. The fact you copied, word and all the Wiki entry gave the forum the idea that you did indeed copy it. If you know the technical aspects of the 96ts, why not explain it in your own words?
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Post by alfie on Dec 21, 2011 21:49:27 GMT
What's sinusoidal?  |
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Deleted
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Post by Deleted on Dec 21, 2011 21:54:21 GMT
Whistlekiller this comment is bang out of order am only 15 but i do know things about trains and i knew that GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings i have known that. Next time if you have not thing nice to say DONT SAY IT AT ALL! (Sigh) Jardine, I'll not bother offering support again as you don't seem to be able to understand what support is when you read it. Oh, and by the way "chopping' the supply voltage in order to drive a sinusoidal current in the motor windings" is the second time you've cut and pasted directly from Wiki on this subject now isn't it? First time funny, twice - a bit lame. Wise up eh? |
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Deleted
Deleted Member
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Post by Deleted on Dec 21, 2011 22:08:39 GMT
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Post by jardine01 on Dec 21, 2011 22:10:13 GMT
Just leave it at that I will explain it in my own words next time shall I? Why should I row over nothing Eh?
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Post by phillw48 on Dec 21, 2011 22:13:18 GMT
And I thought it was speaking and sounding like Kenneth Williams with a heavy cold. ;D |
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Deleted
Deleted Member
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Post by Deleted on Dec 21, 2011 22:28:00 GMT
Just leave it at that I will explain it in my own words next time shall I? Why should I row over nothing Eh? Yes, you should explain it in your own words in future Jardine or alternatively quote your sources if you intend cutting and pasting wholesale like that. I've no idea why you should row about nothing either!  Now, you have a good festive season.  |
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Post by alfie on Dec 21, 2011 22:54:33 GMT
Thanks whistlekiller..along with jardine's helpful description I get the 96 stock noise now..(though not the unfamiliar one)
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Rich32
Staff Emeritus
Posts: 1,506
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Post by Rich32 on Dec 21, 2011 22:58:28 GMT
Moderator Comment
Gents -
Can we please keep the discussion civil. Season of goodwill and all that. Thank You
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Post by eurostarengineer on Dec 22, 2011 15:10:59 GMT
Whistlekiller this comment is bang out of order am only 15 but i do know things about trains and i knew that GTO thyristor used on 1996 stock achieves this by chopping' the supply voltage in order to drive a sinusoidal current in the motor windings i have known that. Next time if you have not thing nice to say DONT SAY IT AT ALL! (Sigh) Jardine, I'll not bother offering support again as you don't seem to be able to understand what support is when you read it. Oh, and by the way "chopping' the supply voltage in order to drive a sinusoidal current in the motor windings" is the second time you've cut and pasted directly from Wiki on this subject now isn't it? First time funny, twice - a bit lame. Wise up eh? DC does not have sinusoidal current.... AC does as it used PFC's to 'monitor' and 'adjust' the voltage! Don't know a lot then! No point in faking something your not fella... I learned that when I was your age I learned the hard way kid, don't make the same mistake. |
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SE13
In memoriam
RIP 23-Oct-2013
Glorious Gooner
Posts: 9,737
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Post by SE13 on Dec 22, 2011 18:05:53 GMT
Ok, ok, we've made our points, can we just keep to the subject matter, and save the point scoring for MSN or whatever...
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