Development of a Mobile Measurement Device Prototype for Parallelity Measurement of Rails
Keywords:
Train, Parallel, Rail, MeasurementAbstract
This experimental research involved the fabrication and development of a prototype to determine rail parallelity; the prototype is mobile in nature and can easily change the point at which measurements are to be made. Parallelity of BS100A standard rails, with a parallel distance of 459 mm, was measured using the developed hydraulic parallel gauge (HPG) along with a pressure transducer. Experimental results were validated with those obtained using a laser distance meter; the measurement accuracy was noted to be 0.89 mm or 11.13 percent difference. The fluctuation of the internal pressure of the hydraulic cylinder, which was due to the accumulation of the stored pressure during the change of pressure, was the source of error. Such a fluctuation can nevertheless be reduced by using a spring with higher stiffness value. Based on the experimental data, the relation between HPG pressure and parallel distance could be correlated using a fifth order polynomial equation. The mobile HPG developed in this research can be further developed and used with the standard gauge rail system after being calibrated with a standard measurement device viz. a track gauge meter. This would result in the development of HPG into practical use in rail parallelity measurement.
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