THE RAIL INDUSTRY SPECIAL FOCUS
supplied with an optional Bluetooth interface for PC connection. The PRP series – a fully portable rail
position measurement within ±25mm of the target. The sensor features a digital numeric display or can be
profile measurement gauge – is available for vertical and lateral railhead wear of up to 14mm with an accuracy in the region of 0.1mm. With integral PDA connection, the motion controlled device laser scans the rail profile with information that may be transferred to a PC database with simultaneous additional parameters such as date, operator number, permanent way division, track number, rail type, etc. The fully automated VKP and LKP rail
POWERING HIGH SPEED TRAINS
Running at speeds up to 250kph, high speed trains get passengers to their destination safely, comfortably and quickly. In Switzerland, the geography means building a dedicated high-speed rail infrastructure there is impractical; yet the alternative of running the high speed trains on conventional track would compromise passenger safety and comfort. As a solution, SBB CFF FFS, Switzerland’s national rail company, has
ordered nineteen Alstom ETR 610 trains, each of which has seven carriages, can accommodate up to 430 passengers, and travels at speeds up to 250kph on regular rail routes. Train passengers can experience the effects
of inertia when rounding a bend – the centripetal force will press the passenger into the seat causing discomfort, while those standing can lose their balance. Tilting trains are designed to counteract the effects of inertia by compensating this g-force. Recently, computer-controlled power mechanisms were introduced to perform an ‘active tilt’ motion. In reactive mode, bends in the track are detected by gyroscopes,
which determine their precise angle, and by accelerometers situated on the first bogie of the lead car. The on-board computer ascertains the tilt angle required and transmits an order to each carriage’s bogie
wheel measurement systems are also available for measurement of geometric parameters for inspection in railcar/wheel repair shops and depots. These systems employ tried and tested RF600 laser scanners and RF656 optical micrometers to return a complete dataset of information over one wheel rotation for wheel diameter, profile, wear characteristics and more.
Ixthus Instrumentation T: 01327 353437
www.ixthus.co.uk
Enter 233
cylinders, timed according to their position and the speed of the train. Eaton has provided the powerful Hydraulic Power Units for each of the bogies. Each unit contains PVM piston pumps, slip-in cartridge valves, servo vales and filtration products. This hydraulic tilting bogie activates the body shell’s tilting. To improve the train’s dynamic performance and passenger comfort, an active lateral air suspension system keeps the body shell centred. And, by reducing unsprung and simple suspended masses, the train’s dynamic behaviour has been optimised, and its wheel forces minimised. The tilting pantograph is mounted on a
sliding carriage that is fixed firmly to the roof of the train and also features Eaton hydraulic components. When the train tilts, an active counter-translation hydraulic system slides the carriage sideways to compensate for the tilt, allowing the pantograph to remain in its central position. In anticipative mode, the system relies on a database of the line’s parameters. By
comparing this data to information received by on-board sensors, the system can pinpoint the train’s exact position on the line at any moment and order the corresponding tilt for the route as it is reached. By reacting quicker at approaching bends, it is less sensitive to track irregularities and so can offer a smoother transition.
Eaton Hydraulics
www.eaton.com/hydraulics Enter 234
IT INFRASTRUCTURE
SOFTWARE & SERVICES
www.rittal.co.uk
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