Tests of resistance of railway vehicles to derailment are performed either in the testing lab of the VÚKV a.s. at Cerhenice or in the place specified by the client (for example in the manufacturing plant or the depot).
The aim of the test is to prove that a vehicle shall not derail by excessive wheel unloading when negotiating normal variations in track twist.
One of the equipments used by the VÚKV a.s. for these tests is the computer-controlled mobile wheel unloading test bench (with hydraulic system) In the course of the test carried out on this mobile equipment the wheel force values are monitored with the sensors together with the vertical displacement of the wheels. The characteristic properties and advantages of the mobile test bench of the VÚKV a.s. include:
Tests of resistance of railway vehicles to derailment are conducted in compliance with:
The VÚKV a.s. testing laboratory further measures torsional stiffness of vehicle underframe (carbody) according to ERRI B 12/DT 135.
The test outputs include but are not limited to:
Wheel unloading measurement conducted during the test of resistance to derailment on the VUKV a.s. mobile test bench can be conveniently combined with the measurement of sway coefficient and roll center height. Thanks to that all the tests can be performed within a single manipulation of the tested vehicle at the test bench, which saves costs of the testing.