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Post by jardine01 on Aug 16, 2011 14:52:39 GMT
Does any body know when the 1996 stock comes to a stand there is a squeak noise is it the brakes or something like that?
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Post by tecchy on Aug 16, 2011 16:22:42 GMT
Depends what type of squeaking. Does it sound like wet trainers on a plastic floor or does it sound like a squeaky car brakes? Presumably when you say come to a stand I would assume brake blocks against the wheel.
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Post by jardine01 on Aug 16, 2011 18:10:44 GMT
It is when the train comes to stand for a second I have got a clip on youtube of it but how do you upload it to here?
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Post by Deleted on Aug 16, 2011 21:06:18 GMT
I think you mean more of a clonk? Isn't that just the slack in the couplers between the motor and trailer cars? I've noticed in the tunnel sections the trains come to quite a sudden halt in ATO.
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Post by br7mt on Aug 16, 2011 21:40:58 GMT
The squeaking noise is the brake blocks rubbing against the wheels during the last bit of the braking curve when rheo/regen has ceased to provide any braking effort.
The clonking noise is probably some slack being taken up in the autocoupler or semi-permanent coupler during deceleration.
Regards,
Dan
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Post by jardine01 on Aug 17, 2011 6:12:25 GMT
No its not like a clonk when the train comes to a sudden halt. When it was manual you could hear it more I asked one of the drivers this last year he thinks it when you put the CTBC into stow it makes the sound. But you can still hear it when it does it in ATO. How can i get a video of youtube onto here and I will show you all what I mean.
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SE13
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Post by SE13 on Aug 17, 2011 7:53:32 GMT
No its not like a clonk when the train comes to a sudden halt. When it was manual you could hear it more I asked one of the drivers this last year he thinks it when you put the CTBC into stow it makes the sound. But you can still hear it when it does it in ATO. How can i get a video of youtube onto here and I will show you all what I mean. Copy the URL, and paste it into the reply box. Alternatively, you could put it between [youtube] tags. |
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Post by jardine01 on Aug 17, 2011 17:09:28 GMT
Here is the link go onto Youtube and type in . Click on Boarding Jubilee line 1996 stock at Canning Town. Listen when the train comes to a halt like a squeak noise you will know what I mean when you see this video!
Hope this helps
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Post by v52gc on Aug 17, 2011 17:42:04 GMT
Is it the "wïyoushhh" sound you mean just before the doors open? Then it's probably the brakes securing the train on stopping or the door locking mechanism being released.
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SE13
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Post by SE13 on Aug 17, 2011 17:50:19 GMT
I presume you mean this one?
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Post by jardine01 on Aug 17, 2011 18:47:30 GMT
Yes thats the one!
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Post by tecchy on Aug 17, 2011 19:30:37 GMT
That's the extra pressure to the brakes to ensure you won't get any further movement ;-)
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SE13
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Post by SE13 on Aug 17, 2011 19:36:09 GMT
That squeal isn't exclusive to the 96ts, you'll hear it almost anywhere on the rail network.
My understanding (and I'll happily be corrected) is that brakes being air operated, thus the latter application at the slower speed means the flange is pushed closer to the running rail - Metal on metal = squeal.
Hopefully someone will be along to correct/amend/confirm bearing in mind that I can drive a bus, not a train!
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Post by tecchy on Aug 17, 2011 19:50:31 GMT
The brake block on LU trains clamps onto the tread and the root of the flange, so it would be rare that the wheelset would move laterally so much that it would cause a squeak during the application of air brake. Lubrication on the brake actuator arm can often mean a squeak. Air 'rushing through the pipes' due to extra pressure is the case in this circumstance. (assuming you mean 29 - 31 secs in the video)
The station stop brake command or holding brake cylinder pressure is different to the pressure of the cylinders when the doors are open or a door open command is (constantly) being generated. Basically full pressure wheel to brake block when the doors are open to avoid any chance of movement!
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SE13
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Post by SE13 on Aug 17, 2011 20:01:36 GMT
Sounds better than my suggestion!
The comparison with buses sometimes runs hand in hand, other times it's the opposite - On a bus, the air pressure holds the brakes apart, hence the "whoosh" sound when they are applied.
Anyhow, Dave would kick my backside from here to kingdom come for that comparison, so I'll slide away quietly, and leave the experts to it!
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Post by tecchy on Aug 17, 2011 20:05:34 GMT
Same principle of trains in that regard! Depends on stock and which have spring applied parking brakes or not!
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SE13
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Post by SE13 on Aug 17, 2011 20:13:45 GMT
Same principle of trains in that regard! Depends on stock and which have spring applied parking brakes or not! Indeed, vacuum brakes are (apparently) a thing of the past now - Had a decker on a hill one time that dumped it's air, so luckily it applied the brakes. Anyhow, we (I) digress.... |
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Post by jardine01 on Aug 17, 2011 21:52:23 GMT
The 1995 stock does it aswell but the 1992 stock does not do it in ATO in CM it does sqeal. so presumably the squeal is when the train is in Manual? The 2009 stock or the S stock does not seem to do it.
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Post by Deep Level on Sept 6, 2011 11:38:05 GMT
Oh how I love the sounds of a 96ts train, especially the acceleration and deceleration noise.
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