Produção Nacional
Revisado por pares
Quantification of brake creep groan in vehicle tests and its relation with stick–slip obtained in laboratory tests
2016; Elsevier BV; Volume: 369; Linguagem: Inglês
10.1016/j.jsv.2016.01.036
ISSN1095-8568
AutoresPatric Daniel Neis, Ney Francisco Ferreira, Jean Carlos Poletto, Luciano Tedesco Matozo, Diego Masotti,
Tópico(s)Railway Engineering and Dynamics
ResumoThis paper describes the development of a methodology for assessing and correlating stick–slip and brake creep groan. For doing that, results of tribotests are compared to data obtained in vehicle tests. A low velocity and a linear reduction in normal force were set for the tribotests. The vehicle tests consisted of subjecting a sport utility vehicle to three different ramp slopes. Creep groan events were measured by accelerometers placed on the brake calipers. The root mean square of the acceleration signal (QRMS parameter) was shown to be able to measure the creep groan severity resulting from the vehicle tests. Differences in QRMS were observed between front-rear and left–right wheels for all tested materials. Frequency spectrum analysis of the acceleration revealed that the wheel side and material type do not cause any significant shift in the creep groan frequency. QRMS measured in the vehicle tests presented good correlation with slip power (SP) summation. For this reason, SP summation may represent the “creep groan propensity” of brake materials. Thus, the proposed tribotest method can be utilized to predict the creep groan severity of brake materials in service.
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