This page contains a Flash digital edition of a book.
IT AND DIGITAL INNOVATION


Plain Line Pattern Recognition P


RTM talks to Network Rail’s Tim Flower about a track fault-fi nding technique heralded as ‘the future of continuously- welded track inspection’.


lain line pattern recognition (PLPR) brings track inspection into the 21st century,


Network Rail says – as senior industry fi gures saw for themselves when the organisation’s New Measurement Train (NMT) called at St Pancras to show off the new kit.


The genesis of the idea is about as old as the NMT itself, which originally had cameras fi tted to its underside on the ‘fl ying carpet’ – the hydraulic system that kept the cameras lined up with the railhead so the image recognition always knew where the railhead was to start its pattern recognition.


But problems with that system led the team to swap those cameras for ones by Omnicom in 2007-8, which led to a pilot project with Loughborough University – which morphed into Rail Vision. After their proof-of-concept, it became a full-blown Network Rail project.


Although the idea of PLPR exists elsewhere around the world – including in Switzerland, at a Rio Tinto mine in Brazil, and a metro system in South Korea – Network Rail programme manager Tim Flower told RTM that the UK solution is much broader. He explained: “It’s been used before, but only really on homogenous railways, with all the same fastener type – generally fairly new railways as well. The idea has been used before, but ours is a far wider-ranging roll-out of the idea.”


Omnicom Engineering and Network Rail won


‘Innovation of the Year’ at the National Rail Awards for OmniVision, a key part of the PLPR project, and it is now being fi tted to four other trains.


Explaining the different faults it can be used to spot, Flower said: “For fasteners, stereo imaging is used – the top-down and diagonal cameras [see box]. The diagonal cameras back up what the top-down cameras have found. It’s a secondary check.


“For joints, we don’t do any pattern recognition using the diagonal cameras, but it provides us with additional information when we decide we’re going to review a joint: we review a joint when it goes to a certain threshold on its dip angle. Then the on-train inspectors are able to review those joints using the diagonal cameras as well as the top-down.


“The four-foot camera is solely used to review the track condition when we’ve found pattern recognition faults.


“We haven’t yet started using the thermal cameras: we put those on to future-proof the system. The aspiration with those is that we use them to look for heating up of the rail, which can lead to arc damage and things like that. We’ve got a conductor rail measurement system that does a similar operation, so we’ll also need to integrate with that.


“The other operation was looking at measuring


the rail temperature and overlay with the joint gap, on jointed track: that’s not part of our scope yet, but the next iteration will be to look at jointed track.”


Flower said: “We’re currently running at about 20 things for the on-train inspector to look at per mile, which we call candidates. Of those, about 30-35% get verifi ed as defective, but a high proportion of those are ballast obscuring the fasteners. So, we’re developing the system to minimise the number of times that gets presented to the on-train inspectors. It basically cuts down the workload.”


PLPR is going to be run as a service offered by Network Rail’s Asset Information team to the individual routes. “It’s not mandated, but it is highly encouraged,” Flower said.


“Andy Jones, our head of track engineering, says it gives better assurance; a positive confi rmation that every piece of track has been inspected, with the record in a computer system so it’s very auditable. The buy-in has been really good – ‘when are we getting it’ is what we get asked a lot.


“It’s part of our overall strategy to remove people from red-zone working, which obviously track inspection can form quite a big part of. Essentially, this gets people away from moving trains. As we evolve the system, hopefully we’ll be able to roll it out to S&C, which will bring further benefi ts.”


42 | rail technology magazine Dec/Jan 13


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92