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Post by Deleted on Oct 27, 2018 20:47:15 GMT
Hi all Recently watched a BBC video on YouTube in regards to crowd control on the Victoria line Watch here - In the video they mention how the 2009 Tube Stocks have loading indicators, I am curious to know when this was fitted to them or has it always been? I certainly didn't know they had that! Thanks!  |
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Post by Dstock7080 on Oct 27, 2018 21:42:01 GMT
In the video they mention how the 2009 Tube Stocks have loading indicators, I am curious to know when this was fitted to them or has it always been? I certainly didn't know they had that! Thanks! When first introduced ‘09 Stock would crudely show “low” “medium” “high” loading, this has recently been changed to the more accurate percentage version. Just checking, 1995 and 1996 Stock have "L" "M" "H" as loading indicators, as '09 Stock had previously. |
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Chris M
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Post by Chris M on Oct 27, 2018 23:40:44 GMT
AIUI load monitoring is trivial to include in trains as they're being built but extremely difficult (and economically unjustifiable) to retrofit. Although once installed upgrading the precision is probably just software enhancements (and possibly getting enough data for calibration)
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Post by MoreToJack on Oct 27, 2018 23:55:11 GMT
I believe it is derived from the suspension.
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Chris M
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Post by Chris M on Oct 28, 2018 0:56:34 GMT
I have a very vague recollection that it's done by measuring the difference in electrical conductivity caused by the deformation of the metal in the suspension (more weight = greater deformation). Or something like that.
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Post by 100andthirty on Oct 28, 2018 8:21:37 GMT
Chris M.. Load is almost always sensed from the secondary suspension. Either from the air pressure in the air springs or, on trains without air secondary suspension, from the device used to sense to adjust brake forces dependent on load. All LU train have this facility (very crude on the 1972 tube stock). The challenge is collecting and processing the data and getting the information off the train.
Some trains in the UK have a system that counts passengers in and out of the train involving sensors above every doorway. This is not used on LU, as far as I know.
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Post by d7666 on Nov 1, 2018 21:59:36 GMT
1992TS certainly has load indicating and recording: the load for every inter station run is logged at CLSCC (and archived) and is also sent to every station (to the station control rooms 'predictor' as some call it). 92TS it is car by car, bogie by bogie, and as stated elsewhere is derived from suspension air bags. When ATO introduced, 92TS was the first to transmit this data live back to the control centre, IIRC it is encapsulated in 4 bytes of data for the whole 8 cars, but as no other line at the time was doing it, it did not make it into trackernet. Since then with other lines transmitting it, it is available through trackernet etc on those other lines, but not yet (AFAIK) from Central although apparently planned to be.
Main line trains have load sensing too. At least 319s (and all that generation Mk3 EMU like 317/318/320/321/322 455/456) and possibly the Pep type EMU like 507/508 313/314/315 etc do. On 319s it was certainly interlocked with the traction circuit, if a 319 became grossly overloaded at a station, it prevented traction power from being taken.
hth
--
Nick
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Post by countryman on Nov 2, 2018 9:17:05 GMT
Interesting that in the track diagram, a train reversing at Victoria has a 3% load!
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Post by trt on Nov 2, 2018 12:56:09 GMT
I seem to recall there was an expert system connected to the CCTV from the platforms to visually detect platform loading, and I was at an event recently where Synology were showing off their vision tracker which could detect movements into and out of a building by tracking direction of motion. That gave a good estimate of the number of people in a building - not absolutely precise, but not bad. It could even distinguish cyclists from pedestrians and those from mopeds and those from cars. It was pretty slick. Interesting that in the track diagram, a train reversing at Victoria has a 3% load! Yeah, it's all the left behind copies of The Metro. |
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Post by superteacher on Nov 2, 2018 13:07:25 GMT
I seem to recall there was an expert system connected to the CCTV from the platforms to visually detect platform loading, and I was at an event recently where Synology were showing off their vision tracker which could detect movements into and out of a building by tracking direction of motion. That gave a good estimate of the number of people in a building - not absolutely precise, but not bad. It could even distinguish cyclists from pedestrians and those from mopeds and those from cars. It was pretty slick. Interesting that in the track diagram, a train reversing at Victoria has a 3% load! Yeah, it's all the left behind copies of The Metro. Or a rather overweight train operator! |
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Post by Deleted on Nov 2, 2018 13:42:57 GMT
I believe it is derived from the suspension. This is it I think. On the D78s, there was an arm that would get pushed down by the suspension (I think it was as the blob compressed). This would then be used by the train to know how much brake that car would require to allow the whole train to brake at the same rate of deceleration. |
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