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Axload :
RAILWAY AXLE WEIGHT MEASUREMENT SYSTEM,
AND GROSS TRAIN WEIGHT

Description
The Axload system is designed to measure the load a railway wheel exerts on a railway track, and hence determine the axle weight. It does this by the use of stress sensors which measure shear stress, when inserted into an 8mm hole drilled on the neutral axis of the rail. Two sensors are fitted for each measurement channel, one at either end of a sleeper bay (arranged to give opposite sense outputs). The outputs of the sensors are subtracted, giving a resulting single positive peak, which is then processed. The results from each axle thus measured are grouped together into trains, and the data is stored. In addition to the individual axle weights, the outputs are calibrated and totalised to give Axle Count, Total Weight, and Train Count Etc.

A serial port is provided to extract the data locally to a PC, or it can be accessed remotely via a GSM dial up modem.


Operation

A 16 bit converter running at 5000 readings per second is used to detect the peak in signal associated with an axle passing. A peak finding algorithm extracts the maximum value, and stores it in a temporary buffer. When the last axle of the train has passed (determined by the Max time between axles), the data is copied into the data logging memory, together with the date, time, temperature, battery voltage and number of axles on the train. Totalised data is also updated.

For the first 12.8 seconds of each train passing, every A-D converter value is stored in the high-speed data capture memory. This data may be interrogated to determine the correct operation and orientation of the sensors. Data capture is regarded as an installation tool only.


Results

Data is transferred into a PC either by direct connection (RS232) or by modem. The data from each train is then stored in an Excel compatible file format as:

Date, Time, No of Axles, Battery Voltage, Temperature, Axle 1, Axle 2, ….etc.

Axle data is stored as A-D converter counts.

Totalised values & calibration factor (counts per tonne) are also transferred, allowing for future analysis.


Calibration
Calibration is carried out from the PC, and allows selection of a single known axle weight, or a combination of axles on a known vehicle weight (e.g. Loco), to calculate the calibration factor which is then stored in the logger.



For further information contact Rail Technology Ltd on:

Tel: +44(0) 1283 790012

Fax: +44(0) 1283 792371

Email: info@railtechnologyltd.com

 



 
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