Nonlinear transient and chaotic interactions in disc brake squeal

Oberst, Sebastian; Lai, J.C.S.

doi:10.1016/j.jsv.2015.01.005

Cited by 69 publications

(40 citation statements)

References 48 publications

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“…As shown in Ref. [6] the pad disk contact solely can be enough to introduce subcritical flutter. However, for this investigation, the movement of the pad between leading and trailing edge has to be simulated, and therefore contacts at the edges of the pad are necessary.…”

Section: Model Discussion: Nonlinearities In the Systemmentioning

confidence: 85%

“…Because of its fast calculation time many working points can be investigated leading to a good overview of the robustness of the brake [3]. Unfortunately, the brake system is highly nonlinear [4][5][6][7] and linear stability analysis can lead to wrong results. Not only the amplitudes of the limit cycles cannot be calculated but also subcritical flutter can occur, meaning that with the right initial conditions a stable limit cycle beyond the linear stability borders can be found.…”

mentioning

confidence: 99%

“…Not only the amplitudes of the limit cycles cannot be calculated but also subcritical flutter can occur, meaning that with the right initial conditions a stable limit cycle beyond the linear stability borders can be found. Oberst et al [6] showed in his report that if one solely considers the nonlinearity of the pad and the disc contact subcritical flutter can already occur. Kruse et al [5] showed in a minimal model, that the joints e.g.…”

mentioning

confidence: 99%

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Transient Squeal Analysis of a Non Steady State Manoeuvre

Stump¹,

Könning²,

Seemann³

2017

JMEA

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Brake squeal is one of the main NVH (vibration harshness) challenges in the brake development of passenger cars. The conflict of goals in the development process and the late testability leads to the need of a deeper basic understanding of the squeal phenomenon and definition of design rules. On the other hand, brake squeal is still a very interesting field of research also for the universities because of its combination of different fundamentals, such as friction and stability behaviour of systems with local nonlinearities. Major nonlinearities of the brake system are the joints, especially the contact areas formed by the oscillating brake pad and the caliper. The state-of-the-art calculation method, which still is the "complex eigenvalue analysis", linearizes these joints, hence, neglecting its nonlinear influence in the stability analysis. Vehicle and bench experiments show that special driving manoeuvres like parking, where the brake pad often leaves the steady state, are likely causing brake squeal. The system in these manoeuvres sometimes behaves opposed to the linearized stability analysis, indicating a limit cycle beyond the Hopf point. Therefore, these states must be investigated more closely. This paper investigates the nonlinear influence of the pad caliper joint in a fixed brake caliper, also called abutment. Bench tests with pressure foils at the abutment of the brake caliper and mode shape analysis were done and a simple FE (finite element) model for a transient simulation is proposed. It is shown that the joint activity varies with driving manoeuvres, leading to different stability behaviours and limiting cycle amplitudes.

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Section: Model Discussion: Nonlinearities In the Systemmentioning

confidence: 85%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Transient Squeal Analysis of a Non Steady State Manoeuvre

Stump¹,

Könning²,

Seemann³

2017

JMEA

View full text Add to dashboard Cite

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“…A steady-sliding state is usually assumed and only a constant uniform contact pressure is applied to simulate self-excitations and to determine the stability around an equilibrium point. However, linear stability predictions can be wrong [9][10][11] and have been observed in experiments and simulations [12][13][14] to be influenced by local sticking, slipping as well as separation owing to local pressure differences [15]. Also, in a real braking process the applied pressure is actually fluctuating with small harmonic out-of-plane vibrations and random noise [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the complex eigenvalue analysis (CEA) method as the most prominent analysis tool to predict brake squeal propensity has been consistently shown to be under-and over-predictive owing to difficulties in modelling the complexities of a brake system: damping in general, the shim [18][19][20] or the contact, and validated friction laws [15,21]. The CEA is under-predictive either due to the existence of subcritical Andronov-Hopf bifurcations [9,11,18,22] or due to nonlinear post-limit cycle behaviour [10,11]. The CEA is over-predictive because unstable vibration modes do not necessarily produce audible squeal [23].…”

Section: Introductionmentioning

confidence: 99%