Contribution Analysis of Assembled Brake System to Reduce Squealing

Kwon, Sun‐Jung; Kim, Chan-Jung

doi:10.3390/app122111232

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…In addition, most of the tribological studies about brakes have focused on braking systems that are not for aeronautical applications. Some works have aimed at analyzing the squealing of brakes, with the aim of reducing this effect by using theoretical and experimental approaches [13][14][15]. Some other works have specifically aimed at studying the contact mechanics and wear behavior of the brakes [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Wear Characterization and Durability Enhancement of an Aeronautic Braking System

Logozzo

Valigi

2023

Applied Sciences

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This paper is focused on the experimental wear characterization of an electromagnetic braking system used for helicopters. The characterization was performed through the evaluation of some monitoring parameters during endurance tests on a test bench and through the visual analysis of the worn surfaces after the tests. The monitoring parameters were the engagement threshold voltage, the release threshold voltage, the inductance, and the braking torque, which are directly correlated with the wear progress. The visual analysis allowed the assessment of the wear extent and the distribution of wear particles at the interfaces. The test performed on the initial base configuration, having ten springs and carbon fibers as friction materials, demonstrated that the braking system had insufficient durability in terms of actuation cycles. The results allowed the design of two new configurations based on different brake architectures and on different friction pairs. One of the new configurations was based on a reduction in the number of springs (eight-spring configuration), and the second one was based on the employment of a different friction material (NAO configuration). Both of these optimized configurations showed enhanced durability and wear resistance, but only the second one showed sufficient durability with respect to the requirements and was defined as acceptable. The final results showed a durability of 3000 actuation cycles for the base configuration, 4385 for the eight-spring configuration, and 35,223 for the NAO configuration. Nevertheless, the analysis of results allowed the cause of the wear phenomena to be studied and eventual further improvements in the system to be suggested.

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Section: Introductionmentioning

confidence: 99%

Experimental Wear Characterization and Durability Enhancement of an Aeronautic Braking System

Logozzo

Valigi

2023

Applied Sciences

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A Root Cause of Curve Squeal: Self-Excited Frictional Vibration of a Wheelset–Track System

Feng,

Chen,

Song

et al. 2024

Journal of Tribology

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When a metro vehicle navigates a tight curve, it invariably causes a squealing noise. Most researchers proposed the negative friction-velocity slope as the generation mechanism for curve squeal. However, some phenomena of railway curve squeal are still difficult to explain. The purpose of this paper is to establish a friction-coupling finite element model of the wheelset-track system that can accurately predict curve squeal and to examine the influence of different wheelset-track structures on the trend of curve-squeal occurrence. It has been proposed that curve squealing is caused by self-excited frictional vibrations. The complex eigenvalue analysis (CEA) and transient dynamics analysis were applied to predict the unstable vibration of curve squeal. The impacts of the coefficient of friction between the rail and the wheel, wheel web plate shape, fastener damping, gauge and negative friction-velocity slope on the curve squealing noise were studied. The results demonstrated that the predicted frequency corresponded to the main frequency of the squealing noise measured on-site. Simultaneously, a friction coefficient of 0.25 or higher resulted in a curve squeal with a frequency of 2153.9 Hz. An S-shaped web plate wheel, appropriate fastener damping, and gauge can reduce unstable vibrations and curve squealing when a metro vehicle navigates a tight curve. The negative friction-velocity slope has less influence on the tendency of curve squealing.

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Contribution Analysis of Assembled Brake System to Reduce Squealing

Cited by 2 publications

References 24 publications

Experimental Wear Characterization and Durability Enhancement of an Aeronautic Braking System

Experimental Wear Characterization and Durability Enhancement of an Aeronautic Braking System

A Root Cause of Curve Squeal: Self-Excited Frictional Vibration of a Wheelset–Track System

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