Reduction of Noise from Disc Brake Systems Using Composite Friction Materials Containing Thermoplastic Elastomers (TPEs)

Masoomi, Mahmood; Katbab, Ali Asghar; Nazockdast, Hossein

doi:10.1007/s10443-006-9018-7

Cited by 14 publications

(11 citation statements)

References 16 publications

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“…The damping ratio value for nonasbestos organic-type FM containing novolac resin as a binder and various ingredients including metallic fillers can vary in composition from 2% to 5% [18]. The damping ratios of the remaining materials in the model were considered to be the same as for the disc component.…”

Section: Mathematical Description Of Pad-on-disc Systemmentioning

confidence: 99%

“…Since the friction material (FM) and the disc have damping that is an order of magnitude different [16,17] and system damping is thus far from Raleigh, it is appropriate to expect dissipation-induced instability in such systems. Masoomi et al [18] studied the modification of damping properties of the FM by adding thermoplastic elastomers into a FM composition. The possibility of changing the damping properties of the FM appears to be a method to control dissipation-induced instability.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Material-Dependent Damping on Brake Squeal in a Specific Disc Brake System

et al. 2021

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The connection of two phenomena, nonconservative friction forces and dissipation-induced instability, can lead to many interesting engineering problems. We study the general material-dependent damping influence on the dynamic instability of disc brake systems leading to brake squeal. The effect of general damping is demonstrated on minimal and complex models of a disc brake. Experimental analyses through the frequency response function (FRF) show different damping of the brake system coalescent modes, indicating possible dissipation-induced instability. A complex system including material-dependent damping is defined in commercial finite element (FE) software. A FE model validated by experimental data on the brake-disc test bench is used to compute the influence of a pad and disc damping variations on the system stability using complexe igenvalue analysis (CEVA). Numerical analyses show a significant sensitivity of the experimentally verified unstable mode of the system to the ratio of the damping between the disc and the friction material components.

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Section: Mathematical Description Of Pad-on-disc Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Material-Dependent Damping on Brake Squeal in a Specific Disc Brake System

et al. 2021

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“…Recently, a few researchers have attempted to minimize the brake noise by changing the brake pad’s composition. Brake squeal is strongly associated with the natural frequencies of the key components of the brake system, i.e., the brake pad and disc. − For instance, Masoomi et al studied the role of thermoplastic elastomer (TPE) ingredients in friction materials (FMs), and the results suggested that damping properties can be strongly affected by TPE and the high content of TPE proved to be the best for noise reduction. Bhatt et al explored the potential of calcium silicate (commercially Promaxon-D) to ameliorate the brake noise and vibration (NV) performance.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Brake Noise and Vibration Using Aramid and Zylon Fibers: Experimental and Numerical Study

et al. 2022

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Aramid pulp/fiber is the most vital ingredient of brake friction material (FM) formulation. It is perpetually added to achieve quality brake pads/shoes and improve the overall friction and wear performance. Additionally, novel Zylon fibers have a superior property to aramid fibers. However, no studies give insights on their influence on brake noise and vibration (NV) performance. In the current work, a series of six different types of eco-friendly brake pads was developed. The first five contain aramid pulp, aramid short fibers, and Zylon fibers of different sizes (1, 3, and 6 mm) as the theme ingredients (3 wt %) by keeping the parent composition identical. Additionally, one more pad was developed that contains no aramid/Zylon fibers (i.e., reference pad). The pads were characterized for physical and mechanical properties. The damping and natural frequencies of pads were measured experimentally and numerically. All brake pads were evaluated for detailed NV performance by following the SAE J 2521 test schedule. In addition, numerical simulation was performed to validate the experimental brake squeal results. Results revealed that aramid/Zylon fiber-based pads improved the porosity, damping, and compressibility. Overall, brake noise and vibrations were improved for aramid/Zylon fiber-based pads by 1.2–1.5 dBA and 20–25%, respectively, compared to the reference pad. The complex eigenvalue analysis (CEA) proved that squeal was mainly influenced by the damping and density of the pad materials. Thus, aramid/Zylon fiber-based pads can effectively suppress the instability of the brake system and reduce the brake squeal propensity.

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“…On the front axle, temperatures can reach as high as 300°C. 9 The degradation of friction material starts at 230°C, and the level of degradation escalates with temperature in the range of 269-400°C. 10 As a result, the adhesion ability of resin binder in friction materials would be weakened and delaminated of fillers from the binder, 11 leading to decreases in the friction force and wear resistance, which is called fade.…”

Section: Introductionmentioning

confidence: 99%

Potential use of fly ash and bagasse ash as secondary abrasives in phenolic composites for eco-friendly brake pads applications

Choosri

Sombatsompop

Wimolmala

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Brake pad is the essential component of disk brake in automotive applications that is made of phenolic-based composites. The alumina and silica are often used as primary abrasives in brake pads. In this study, we investigated the hardness, compressive, friction and wear properties under room temperature and elevated temperatures (100°C and 150°C) of phenolic-based composites containing the natural ashes of fly ash and bagasse ash as secondary abrasives, which ranged from 0 to 12 wt%, for replacing primary abrasives. The results suggested that 4 wt% secondary abrasives was recommended for optimization of the overall properties of the composites. It was found that all composites exhibited the abrasive wear behavior evidenced by wear debris between the counterfaces acting as third-body abrasives. The phenolic-based composites at 100°C and 150°C had higher coefficient of friction and lower wear resistance than those at room temperature. The incorporation of bagasse ash resulted in more compression for a given load than that of fly ash. In summary, the fly ash and bagasse ash, which were natural ashes, showed a potential use as secondary abrasives in the phenolic-based composites for eco-friendly brake pads.

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Reduction of Noise from Disc Brake Systems Using Composite Friction Materials Containing Thermoplastic Elastomers (TPEs)

Cited by 14 publications

References 16 publications

Influence of Material-Dependent Damping on Brake Squeal in a Specific Disc Brake System

Influence of Material-Dependent Damping on Brake Squeal in a Specific Disc Brake System

Suppression of Brake Noise and Vibration Using Aramid and Zylon Fibers: Experimental and Numerical Study

Potential use of fly ash and bagasse ash as secondary abrasives in phenolic composites for eco-friendly brake pads applications

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