The called vibratory instability squeal that appears in narrow curve or in end of braking is today uncontrolled and produced a high pitch noise very intense and unbearable. Many solutions exist to limit acoustical emissions and particularly the ring damping solution, with a low overcost compared to others systems. Attenuation can reach to 20 dB depending on the wheel type. Nevertheless the efficiency of this system may vary a lot even for similar wheels without valuable explanation. The question is why system has a various efficiency and if this solution can be optimized. On a physical point of view, the mechanism of acoustic attenuation due to ring dampers is still badly known. The aim of the paper is to understand how attenuation occur and how it can be better controlled and optimized. Experimental measurements have been investigated to determine the damping of the ring damping solution. Numerical models have been developed in order to simulate the behaviour of the ring inside the groove. Sensibility of various parameters is finally discussed.
Attenuation of the squeal noise of railway wheels using metallics rings
2003
8 Seiten, 9 Quellen
Aufsatz (Konferenz)
Englisch
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