Floating Caliper Disk Research Articles

Thermal-mechanical Coupling Analysis of Rear Wheel Brake of Sightseeing Vehicle Based on Workbench

Taking the rear wheel brake of a certain brand of sightseeing vehicle as an example, floating caliper disc brakes and leading trailing shoe brake were simulated and compared for determining rear wheel brake types. The simplified model is established by UG software, imported into Workbench for thermal-mechanical coupling analysis under 10 braking conditions. The results show that the two brakes can meet the requirements of the vehicle, the former has better performance, and the latter has lower cost.

Identification of Contact Stiffness between Brake Disc and Brake Pads Using Modal Frequency Analysis

The contact stiffness between brake disc and brake pads is a vital parameter that affects brake NVH performance through increasing the system stiffness and modal frequencies. In order to establish accurate contact behavior between brake parts for further research on precise modeling of disc brakes, a method of identifying the normal contact stiffness of a floating caliper disc brake was developed in this study based on modal frequency testing and finite element analysis. The results showed that contact stiffness increases with brake pressure due to compression of the friction material and increases with the disc mode order at lower-order modes but almost stays invariant at higher-order ones due to contact area variation.

크리깅기법을 이용한 전륜 디스크 브레이크 모델의 스퀼 저감 해석

Disc brake noise is an important customer satisfaction and warranty issue for many manufacturers as indicated by technical literature regarding the subject coming from Motor Company. This research describes results of a study to assess disk brake squeal propensity using finite element methods and optimal technique (Kriging). In this study, finite element analysis has been performed to determine likely modes of brake squeal. This paper deals with friction-induced vibration of disc brake system under contact friction coefficient. A linear, finite element model to represent the floating caliper disc brake system is proposed. The complex eigen-values are used to investigate the dynamic stability and in order to verify simulations which are based on the FEM model. In this paper, Kriging from among the meta-modeling techniques is proposed for an optimal design scheme to reduce the brake squeal noise.

Analysis of disc brake instability due to friction-induced vibration using a distributed parameter model

This paper deals with friction-induced vibration of a disc brake system with a constant friction coefficient. A linear, lumped, and distributed parameter model to represent the floating caliper disc brake system is proposed. The complex eigenvalues are used to investigate the dynamic stability, and, in order to verify simulations which are based on the theoretical model, an experimental modal test and dynamometer test are performed. The comparison of experimental and theoretical results shows good agreement, and the analysis indicates that modal coupling due to friction forces is responsible for disc brake squeal. Also, squeal type instability is investigated, using a parametric analysis. This indicates which parameters have influence on the propensity of brake squealing. This is helpful for validating the analysis model and establishing confidence in the experimental results of the modified system. These results may also be useful during system development or diagnostic analysis.

Control of disc brake squeal – modelling and experiments

Considerable effort is spent in the design and testing of disc brakes of modern passenger cars. This effort can be reduced if refined mathematical–mechanical models and new experimental techniques are used for studying the dynamics of these brakes. The present paper is devoted to the modelling and the active suppression of brake squeal. A four degree of freedom disc brake model is described and its behaviour with respect to the variation of important parameters is analysed. To actively suppress brake squeal, ‘smart pads’ were designed, manufactured and tested in our laboratory. These pads contain piezoceramic staple actuators, which can be independently driven at both pads and within the pads. Two different control strategies are described and tested on the basis of this model. The first control law is based on optimal control and includes a Kalman–Bucy filter to estimate the system's state. The second control law maximizes the energy dissipated by the friction forces between the disc and the brake pads. Both control strategies are compared with respect to their practical application and implemented in a floating caliper disc brake at a test rig in Darmstadt. Copyright © 2005 John Wiley & Sons, Ltd.

J-10 Squeal in Floating Caliper Disk Brake : Modeling and Active Control(Session: Simulation)

Considerable effort is spent in the design and testing of disk brakes of modern passenger cars. This effort can be reduced if refined mathematical-mechanical models are used for studying the dynamics of these brakes before prototypes are available. Brake squeal is a self-excited vibration resulting from the transfer of rotational energy to vibrating energy of brake components. Dynamic instability arising from the friction force is agreed to be the reason behind brake squeal. Intensive researches on low frequency squeal (noise between 1-5 kHz) have been carried out by the authors and the present paper is devoted to the modeling of the floating caliper disk brake and the suppression of brake squeal using active control. The model includes the brake disk, housing, piston, yoke and brake pads. The floating nature of the caliper has also been taken into account. In a test rig built in TU Darmstadt, the model of the floating caliper disk brake is validated. In addition, the set-up also permits active control by introducing "smart pads". Those brake pads, which include piezoceramic actuators, are successfully used for the suppression of squeal. The authors believe that the "smart pads" can be used as a powerful tool with a high potential for the rapid prototyping of quiet brakes.

Parameter Estimation of the Disk in a Floating Caliper Disk Brake Model with respect to Squeal

AbstractNoise from a vehicle is always a concern for any automotive industry looking for passenger comfort. This also holds for the different types of brake noise, in particular for squeal, which is a source of discomfort both to passengers and passers‐by. Intensive research on low frequency squeal (noise between 1‐5 kHz) has been carried out. A model of the floating caliper disk brake has been recently proposed by the authors with the aim to predict the onset of squeal. A flutter type instability resulting from nonconservative restoring forces is assumed to be the reason behind squeal in this model. The problem of validating the model against experimental observation lies in the fact that all the system parameters included in the model, especially the disk, are to be carefully chosen. In this work some parameters of the disk are estimated and a method is suggested to estimate these parameters in a systematic way. For that purpose, the values are to be accurately selected by experiments and modal updating technique. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

분포매개변수를 이용한 디스크 브레이크의 마찰기인 불안정성 해석

This paper deals with friction-induced vibration of disc brake system under constant friction coefficient. A linear, lumped and distributed parameter model to represent the floating caliper disc brake system is proposed. The complex eigenvalues are used to investigate the dynamic stability and in order to verify simulations which are based on the theoretical model, the experimental modal test and the dynamometer test are performed. The comparison of experimental and theoretical results shows a good agreement and the analysis indicates that mode coupling due to friction force is responsible for disc brake squeal. And squeal type Instability is Investigated by using the parametric analysis. This indicates parameters which have influence on the propensity of brake squeal. This helped to validate the analysis model and establish confidence in the analysis results. Also they may be useful during system development or diagnostic analysis.

Stability analysis of a new model for floating caliper disk brake

The customers' demand for ride comfort has led the automotive industries to look for various ways to reduce and control the brake noise. Intensive research on brake squeal (high frequency noise bet...

Stability analysis of a new model for floating caliper disk brake

The customers' demand for ride comfort has led the automotive industries to look for various ways to reduce and control the brake noise. Intensive research on brake squeal (high frequency noise between 1–5 kHz) has been carried out. A large variety o

Stability Analysis of A Floating Caliper Disc Brake

AbstractIn this paper, the onset of the dynamic instability in a .oating caliper disc brake system is studied. The disc is modelled as a .exible rotating plate, the pad is taken as a small mass and a distributed sti.ness, and the motion of the caliper is also taken into consideration. The linearized equations of motion about the equilibrium position are derived assuming a constant braking force. The equations are subsequently discretized with the help of appropriate shape functions. The eigenvalue problem is then solved to detect the onset of instability. The effects of damping on the stability of motion are investigated as well.