Abstract
When performing the technical tests of the brake system under laboratory conditions, it is necessary to create the same conditions as those in operation. The friction coefficient is dependent on a number of parameters, including airflow during ride and weather conditions. Therefore, during the take-over tests, both these conditions are obligatory to simulate. This paper describes the design of the chamber, which will allow the test stand RAILBCOT to carry out the so-called dry and wet tests with airflow as during real-life ride. It also isolates the acoustic emission and emission of braking material to the surrounding area when tested.
Highlights
One of the basic requirements of European railways is reduction of the noise generated in wheel-rail contact in the service of freight railway wagons [1, 2, 3].Since the beginning of the service it was known, that a significant reduction of freight wagons noise can be achieved by replacing iron cast brake blocks with brake blocks made from composite materials
Brake blocks made from composite materials are used in service [4, 5, 8, 12, 13]
Brake blocks made from composite materials with a similar friction coefficient as iron cast brake blocks (LL-blocks) have to be used to avoid the adaptation of the braking system by using a “silent” K-block
Summary
One of the basic requirements of European railways is reduction of the noise generated in wheel-rail contact in the service of freight railway wagons [1, 2, 3]. The purpose of the test stand is to load the wheelset with an adequate force load, simulated by a combination of engine torque, wheel load change, track gauge free channel size change, wheelset attack angle change, and variable braking mode based on the independent action of four brake units with a change of configuration, shape and the material composition of the brake blocks. The engine has a maximum output power of 434 kW with a constant torque of 3900 Nm. SIMRAIL (Fig. 1) is a module used to plausibly simulate the phenomena encountered during a ride of a real rail vehicle along a real track (lateral displacement of the wheelset and the change in angle of attack) and for modifying the wheel forces values. We will deal with the force effects in the wheelsettrack contact in an arc, ride in a straight track with an empty or loaded vehicle, and with use of the lateral displacement and the angle of attack of the wheelset
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