On Automotive Disc Brake Squeal Part III Test and Evaluation

Chen, F.; Abdelhamid, Mohamed; Blaschke, Peter; Swayze, James L.

doi:10.4271/2003-01-1622

Cited by 22 publications

(6 citation statements)

References 24 publications

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“…Therefore, the necessary number of tests to classify the brake in such manner is extensive, e.g. [4]. The situation becomes more complicated by the fact that there is a possibility for squealing to sometimes occur and sometimes not even during the tests with the identical operation parameters [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

On the Influence of Multiple Equilibrium Positions on Brake Noise

Koch

Köppen²,

Gräbner

et al. 2021

FU Mech Eng

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Brake noise, especially brake squeal, has been a subject of intensive research both in industry and academia for several decades. Nevertheless, the state of the art simulations does not provide a predictive tool, and extensive experimental investigations are still necessary to find an appropriate design. Actual investigations focus on the consideration of nonlinearities which are in fact essential for this phenomenon. Unfortunately, by far not all relevant effects caused by nonlinearities are known. One of these nonlinear effects that the actual research focuses on is the limit cycle behavior representing squeal. In contrast to this, the actual paper considers the influence of the equilibrium position established while applying the brake pressure. The elements of the brake, namely, the carrier, caliper and pad, are highly nonlinear and elastically coupled and allow for multiple equilibrium positions depending e.g. on the initial conditions and transient application of the brake pressure while the frictional contact between the pads and the disk may excite small amplitude self-excited vibrations around this equilibrium, i.e. squeal. The current paper establishes a method and corresponding setup, to measure the position engaged by the brake components using an optical 3D-measuring system. Subsequently, it is demonstrated that in fact different equilibrium positions can be engaged for the same operation parameters and that the engaged position can be decisive for the occurrence of squeal. In fact, certain positions result in squeal while others do not for the same operation parameters. Taking this effect into consideration may have significant consequences for the design of brakes as well as simulation and experimental investigation of brake squeal.

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Section: Introductionmentioning

confidence: 99%

On the Influence of Multiple Equilibrium Positions on Brake Noise

Koch

Köppen²,

Gräbner

et al. 2021

FU Mech Eng

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“…By looking at those results, it can be said that variations in contact pressure distributions are due to brake pad surface topography. This, in turn could also explain the variations in static contact pressure distributions found in [6].…”

Section: Configurations Of Brake Padmentioning

confidence: 78%

“…There has not been much research on the variation of contact pressure distribution for different pairs of pads. In a recent review, Chen et al [6] showed that there appeared noticeable variations in static contact pressure distribution between two new sets of pads, even though the pads have the same specifications and were tested with the same brake system under the same pressure. The reason for these variations was not given.…”

Section: Introductionmentioning

confidence: 99%

Brake Pad Surface Topography Part I: Contact Pressure Distribution

Bakar

Ouyang

Siegel

2005

SAE Technical Paper Series

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Recent studies carried out at the University of Liverpool showed that there was a variation in static contact pressure distributions on two new sets of pads even though they were tested with the same brake system under the same pressure. One of the possible reasons for this variation is due to brake pad surface topography. This paper investigates the effects of brake pad topography on contact pressure distributions. Pressurex ® , pressure indicating films are used to measure static contact pressure distribution. A detailed 3-D finite element model of a disc brake is also developed and takes into account pad surface profiles. A linear gauge is used to measure brake pad topography. Six different pad configurations are studied in this investigation. Results from the investigation could provide a better explanation of the variation in contact pressure distribution and in turn squeal generation.

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“…The most widely used dry friction model is undoubtedly Coulomb's friction law. However, in recent decades dry friction is recognised to be of stochastic nature from both theoretical [19] and experimental [20,21] aspects. It is indeed too ideal to treat the coefficient of friction (COF) as an invariant quantity as the contacting objects are generally surrounded by complicated conditions (e.g., contacting surfaces' roughness, contact forces between the objects, and the interfacial temperature).…”

Section: Introductionmentioning

confidence: 99%