This paper reviews the state of the art of CAE (computer aided engineering) simulation and analysis methods on disc brake squeal. It covers complex modes analysis, transient analysis, parametrical analysis, and operational simulation. The advantages and limitations of each analysis method are discussed. Moreover, analytic methods dealing with continuum models are also briefly covered. According to the mechanism of generation, brake noise can be classified into three types. The first type is called creep-groan caused by the stick-slip motion between the friction material and the rotor/drum surface occurring at near zero vehicle speed. The second type of noise is often called hot judder or rumble caused by periodic features on the rotor/drum surface resulting in cyclic brake torque. Saliently, its frequency is a multiple of the rotor/drum speed of rotation. The third type is usually called squeal with frequencies over 1 kHz independent of rotor/drum speed while maintaining friction contact during occurrence. Investigation into brake squeal was conducted by various experimental and analytic methods. Discoveries made on a particular type of brakes or on a particular type of vehicles are not transferable to other types of brakes or vehicles. A stability margin is usually not found experimentally. Analytical or numerical modeling, on the other hand, can simulate different structures, material compositions, and operating conditions of a disc brake or on different brakes or on even different vehicles. With these methods, noise improvement measures can be tried conceptually before a prototype is made and tested. Theoretical methods and experimental methods are equally important. Both are needed to capture the underlying physics so that eventually a commercial code could be developed. Brake components are a continuous media of infinite number of degrees-of-freedom. Due to their complicated geometrical shape, the finite element method is appropriate. Increasing computing power will not replace further research into the physics of friction and contact. Thermal and stress coupling is also a serious, poorly understood issue. All effects must be included to properly analyse brake squeal and vibration, including linear superelements, complex modes, nonlinear transient stage, contact surfaces with friction, relative rotation between the rotor and the pads, and nonlinear friction laws. Nonlinear finite element crash codes and multibody codes are being extended for brake squeal. Both implicitly and explicitly integrated codes are needed. At present there does not exist a complete system.
On automotive disc brake squeal part II: Simulation and analysis
Über das Kreischen von Autobremsscheiben, Teil II: Simulation und Analyse
2003
11 Seiten, 5 Bilder, 84 Quellen
Aufsatz (Konferenz)
Englisch
Betriebsbedingung , Bremsflüssigkeit , Bremsmoment , CAE (rechnerunterstützte Technik) , Experimentalanalyse , Fahrzeugbremse , FFT (schnelle Fourier-Transformation) , Finite-Elemente-Methode , Freiheitsgrad , Frequenzbereich , Geräuschemission , Geräuschquelle , Gleitkontakt , Gleitreibung , Haftgleitreibung , Instabilität , komplizierte Form , Materialeigenschaft , Modenspektrum , Ruckgleiten , Scheibenbremse , Simulation , Temperatureinfluss , Transientenanalyse , Transversalschwingung , Übersichtsdarstellung , Versuchsergebnis , Vibration
Online Contents | 2003
|On automotive disc brake squeal part II: simulation and analysis
Kraftfahrwesen | 2003
|On Automotive Disc Brake Squeal Part II: Simulation and Analysis
SAE Technical Papers | 2003
|SAE Technical Papers | 1983
|Tema Archiv | 1983
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