(continued from number 3, page 309-329) This paper is the last in a series of three that present an integrated numerical approach to the analysis of disc brake squeal. It focuses on the application of the technique to the solution of a number of generic classes of problem encountered by the brake system engineer and the results are related to real world experience. The application of the integrated finite element approach to the analysis of disc brake squeal has been demonstrated through a number of parametric sensitivity studies. These have illustrated how the modelling philosophy, set out in the first part of this series, can be used to adress different classes of problem that are linked to in-service problems, that might respond to one or a combination of small geometric changes in the design of the wheel brake or operating conditions, friction pair development as well as conceptual design of the wheel brake or brake system that involves large scale changes in layout. The results have shown that squeal propensity is generally reduced if the interface contact between the pad and disc is engineered to be as uniform as possible by, for example, increasing the backplate thickness or reducing the friction material modulus. The simulation techniques presented in this series of three papers together represent a feasible and effective means of predicting not only the interfacial contact pressure distributions but also the natural frequencies, degree of instability and mode shapes of the coupled disc/pad brake system. By focussing attention on the interface mechanics and ignoring extraneous detail, a useful model has evolved whose results have thrown light on the mechanisms that give rise to squeal noise. There are several different avenues along which the current work may usefully move: Develop a parametric representation of a caliper and piston assembly. This would permit the model to simulate the commonly used noise fixes that use shims to introduce damping or control the effective point of contact between the piston and the pad backplate. Use measured surface profiles when defining the interface geometry to explore the influence that worn surfaces or those carrying asperities have on the propensity of the system to squeal. Extend the model to incorporate the effect of thermal loading. A fully coupled analysis that takes into account the interaction between the thermal and structural deformations represents a favourable although ambitious development route. Investigate the effect of material and structural damping on the propensity of the system to squeal.
A predictive tool to evaluate disk brake squeal propensity part 3: parametric design studies
Prognoseverfahren zur Auswertung der Quietsch-Tendenz von Scheibenbremsen, Teil 3: Parametrische Entwurfstudien
International Journal of Vehicle Design ; 31 , 3 ; 330-353
2003
24 Seiten
Aufsatz (Zeitschrift)
Englisch
Finite-Elemente-Methode , Fahrzeugbremse , Scheibenbremse , theoretisches Modell , Modalanalyse , mechanische Schwingung , Geräuschemission , Geräuschquelle , Schwingungsart , Reibkraft , Reibbeiwert , Gleitreibung , Schwingungsverhalten , Fahrzeuggeräusch , Druckverteilung , Anpresskraft , Wärmebelastung , Empfindlichkeitsanalyse , Systementwurf , Produktentwicklung , Rechnersimulation , Reibpaarung , Materialeigenschaft , Schwingungsdämpfung , Dämpfungsverhalten , Anwendung im Fahrzeugbau
A predictive tool to evaluate disc brake squeal propensity Part 3: Parametric design studies
Online Contents | 2003
|A predictive tool to evaluate disc brake squeal propensity part 3: parametric design tools
Kraftfahrwesen | 2003
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