Construct · 2 fields · 2 citations

squeal: one construct, many systems

One name. One construct. Different systems. One map.

● invariant · one construct, two systems Nearest construct by meaning·not indexed
same friction-induced self-excited vibrationsqueal2 SYSTEMSBrake squealKINKAID · DISC BRAKECurve squealTHOMPSON · CURVE

Spokes are the systems the one construct recurs in; dashed arcs are shared lineage. Tap a field for its definition, unit, and measures.

2003Brake squeal2009Curve squeal
2026

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Automotive engineering

the high-pitched noise a disc brake emits when pad-rotor friction drives a self-excited vibration of the assembly.

Brake squeal is the high-pitched noise a disc brake emits when friction between pad and rotor drives a self-excited, unstable vibration of the brake assembly, so a steady sliding contact feeds energy into a resonant mode rather than simply dissipating it. Kinkaid, O'Reilly, and Papadopoulos's 2003 review lays out the friction-coupling mechanisms and the mode-coupling instability behind it. The referent is a friction-induced self-excited vibration that radiates sound, the same construct that appears when a railway wheel squeals on a curve, here realised in a brake.[1]

Unit
The frequency and level of the self-excited brake noise
Recovery means
Not applicable
Measured by
Studied by complex-eigenvalue (mode-coupling) analysis and dynamometer noise testing

Railway engineering

the intense tonal noise railway wheels emit on sharp curves when wheel-rail creep drives self-excited wheel vibration.

Curve squeal is the intense tonal noise railway wheels emit on sharp curves, when lateral creep in the wheel–rail contact triggers a self-excited, unstable vibration of the wheel, usually in an axial mode, that radiates a strong pure tone. Thompson's Railway noise and vibration chapter on curve squeal sets out the falling-friction and mode-coupling explanations and the role of the wheel's resonances. The referent is the same friction-induced self-excited vibration seen in brake squeal, here in the wheel–rail system rather than a brake, measured by the squeal tone and the curving conditions that provoke it.[2]

Unit
The frequency and level of the self-excited wheel tone on curves
Recovery means
Not applicable
Measured by
Characterised by dominant squeal frequency, sound level, and the curve radius and angle of attack that trigger it

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Nearby constructs

assembly1 fields · 1 citationsanchor · a standalone constructconstruct6 fields · 7 citationsjingle · one name, six constructscontact2 fields · 3 citationsjingle · one word, two constructs

References

  1. Kinkaid, N. M., O'Reilly, O. M., & Papadopoulos, P. (2003). Automotive disc brake squeal. Journal of Sound and Vibration, 267(1), 105–166. https://doi.org/10.1016/S0022-460X(02)01573-0
  2. Thompson, D. (2009). Curve squeal noise. In Railway noise and vibration: Mechanisms, modelling and means of control (pp. 315–342). Elsevier. https://doi.org/10.1016/B978-0-08-045147-3.00009-8

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