Mechanisms of Brake Creep Groan

Brecht, J.; Hoffrichter, Wolfgang; Dohle, Achim

doi:10.4271/973026

Cited by 51 publications

(23 citation statements)

References 3 publications

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“…For selected solution parameters, they found the brake disc to undergo two and a half oscillations in slipping and three in sticking periods of the orbit. Groan may also occur on brake application, as reported by Brecht [8]; it typically can be a long event for brake release on takeoff and short for vehicle braking to stop. From simulation studies (and some personal perception during driving), we find that groan occurs most readily under the lowest speeds and lightest brake pedal release.…”

mentioning

confidence: 89%

Analytical investigation of stick-slip motions in coupled brake-driveline systems

Crowther

Singh

2007

Nonlinear Dyn

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In this paper, we investigate the brake creepgroan problem by formulating the issues in terms of two dynamic sub-systems that are coupled at the friction interface, and thus, experience stick-slip motions. Thorough examination of the nature of discontinuous solutions using numerical methods is a useful prelude to analytical studies. We examine such dynamics through parametric studies for magnitude and rate of brake release, where the vehicle is initially at rest and under low constant drive torque. Dependency on the initial conditions and solution flow before reaching the orbit will thus be illustrated. Four types of motions (one steady sliding and three stick-slip) are found based on extensive studies. Our formulation and analysis should lead to a better understanding of the brake groan phenomenon and systems coupled by interfacial friction.

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mentioning

confidence: 89%

Analytical investigation of stick-slip motions in coupled brake-driveline systems

Crowther

Singh

2007

Nonlinear Dyn

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“…Creep groan is a low frequency vibration phenomenon in automotive disk brakes occurring in particular, when the brake is slowly released while the car starts moving (Abdelhamid, 1995;Abdelhamid and Bray, 2009;Zhao et al, 2016Zhao et al, , 2017Brecht et al, 1997;Brecht, 2000;Singh, 2007, 2008). The frequency range is up to 500 Hz and it is caused by the stick-slipeffect.…”

Section: Introductionmentioning

confidence: 99%

“…A general study on friction induced vibrations has been performed by Ibrahim giving also an overview about contact mechanics and friction forces (Ibrahim, 1994a,b). With respect to creep groan, Brecht et al (1997) and Brecht (2000) measured its vibration characteristics and studied the corresponding stick-slip limit cycle. Singh (2007, 2008) modeled the creep groan phenomenon in terms of two dynamic sub-systems coupled with Coulomb's friction law.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigations of the bifurcation behavior of creep groan of automotive disk brakes

Zhao

Gräbner

Wagner

2018

jtam

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There are several low frequency vibration phenomena which can be observed in automotive disk brakes. Creep groan is one of them provoking noise and structural vibrations of the car. In contrast to other vibration phenomena like brake squeal, creep groan is caused by the stick-slip-effect. A fundamental investigation of creep groan is proposed in this paper theoretically and experimentally with respect to parameter regions of the occurrence. Creep groan limit cycles are observed while performing experiments in a test rig with an idealized brake. A nonlinear model using the bristle friction law is set up in order to simulate the limit cycle of creep groan. As a result, the system shows three regions of qualitatively different behavior depending on the brake pressure and driving speed, i.e. a region with a stable equilibrium solution and a stable limit cycle, a region with only a stable equilibrium solution, and a region with only a stable limit cycle. The limit cycle can be interpreted as creep groan while the equilibrium solution is the desired vibration-free case. These three regions and the bifurcation behavior are demonstrated by the corresponding map. The experimental results are analyzed and compared with the simulation results showing good agreement. The bifurcation behavior and the corresponding map with three different regions are also confirmed by the experimental results. At the end, a similar map with the three regions is also measured at a test rig with a complete real brake.

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“…A compaction of the wear debris generated at the friction interface accounts for the formation of the friction film. 14,15 After 250°C the COF exhibited a stable change, with the increasing temperature, in the A1 and A3 specimens, but the COF stability of the A2 specimen containing a high proportion of Fe 2 O 3 was the lowest, especially at elevated temperatures.…”

Section: Resultsmentioning

confidence: 96%

Synergistic effect of organic- and ceramic-based ingredients on the tribological characteristics of brake friction materials

Ertan

2016

Mater. Tehnol.

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In this study, the composition of a brake friction material was experimentally investigated with respect to the effects of the proportions of organic (cashew dust) and ceramic (ZrSiO4 and Fe2O3) based ingredients on the tribological properties. The tribological properties of the friction materials were evaluated using a Chase-type friction tester. The effect of the ingredient proportions on the wear resistance and friction stability were obtained in relation to the test temperature and the number of brakings. A scanning electron microscope was used to study the effect of braking on the sliding surface of the friction material. Results showed that the complementary nature of the organic-and ceramic-based ingredients provided the optimum friction behaviour, such as the coefficient of friction stability and the wear resistance. Keywords: sliding friction, brakes/clutches, wear testing, electron microscopy V {tudiji je bila eksperimentalno preiskovana sestava materiala za torne zavorne obloge, glede na razmerje organskih (prah indijskih ore{~kov) in kerami~nih sestavin na osnovi ZrSiO4 in Fe2O3 ter na tribolo{ke lastnosti. Tribolo{ke lastnosti tornih materialov so bile ocenjene z uporabo preizku{evalca trenja vrste Chase. Vpliv razmerja sestavin na odpornost proti obrabi in stabilnost trenja je bil ugotovljen glede na temperaturo preizkusa in {tevilo zaviranj. Vrsti~ni elektronski mikroskop je bil uporabljen za {tudij u~inka zaviranja na torni povr{ini tornega materiala. Rezultati so pokazali, da komplementarna narava sestavin na organski in kerami~ni osnovi, zagotavlja optimalno obna{anje pri trenju kot sta koeficient stabilnega trenja in odpornost na obrabo. Klju~ne besede: drsno trenje, zavore/sklopke, preizku{anje obrabe, elektronska mikroskopija

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Mechanisms of Brake Creep Groan

Cited by 51 publications

References 3 publications

Analytical investigation of stick-slip motions in coupled brake-driveline systems

Analytical investigation of stick-slip motions in coupled brake-driveline systems

Theoretical and experimental investigations of the bifurcation behavior of creep groan of automotive disk brakes

Synergistic effect of organic- and ceramic-based ingredients on the tribological characteristics of brake friction materials

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