Brake Squeal: A Control Strategy Using Shunted Piezoelectric Pads

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Yaqoub Abdullah ◽  
Amr Baz
Keyword(s):  
User Satisfaction ◽  
Negative Impact ◽  
Mechanical Energy ◽  
Element Model ◽  
Brake System ◽  
Electrical Network ◽  
Design Parameters ◽  
Disc Brake ◽  
Electrical Networks ◽  
Brake Squeal

Abstract Brake squeal has been a challenging issue to overcome for the automotive sector. The phenomenon often underpins more serious mechanical issues leading to poor user satisfaction, compromised safety, and a negative impact on the market. Automotive manufacturers are highly motivated to solve the squealing problem to prevent sudden failure of the brake system, which can be catastrophic. This article provides an approach to mitigate the squealing of brakes through the application of piezoelectric patches shunted by appropriately tuned electrical networks. The designated piezoelectric patches used with the brake pads can provide a unique characteristic, namely, being able to convert the mechanical energy of squealing brakes into electrical energy. This energy can be dispersed throughout an electrical network, fostering greater stability and damping risk factors of the brake system. This technique is envisioned as empowering the disc brake systems to perform across a range of operating parameters in a robust fashion, without experiencing brake squealing. The model proposed in this article is a multifield finite element model that includes two degrees-of-freedom (DOFs) disc brake system model as well as 2DOFs for the shunted piezoelectric network to independently control the brake modes of oscillation and hence to enable the mitigation of the squealing threshold. The brake system establishes the stability limits as a function of the design parameters of the shunted piezoelectric network. The effectiveness of the developed system is also provided in a numerical examples that shows the effectiveness of the shunted piezoelectric networks in controlling brake squeal phenomenon. The method proposed in this article can be applied to distributed disc brakes as an extension of the current work.

Control of Brake Squeal Using Shunted Piezoelectric Pads

2019 ◽  
Author(s):  
Yaqoub Abdullah ◽  
Amr Baz
Keyword(s):  
Automotive Industry ◽  
Mechanical Energy ◽  
Natural Extension ◽  
Electrical Energy ◽  
Brake System ◽  
Design Parameters ◽  
Disc Brake ◽  
Brake Squeal ◽  
Electric Networks ◽  
The Stability

Abstract Brake squeal phenomenon poses serious challenges to the automotive industry due to its technical complexity and the pressing need for mitigating its undesirable effects. More importantly, brake squeal causes significant customer dissatisfaction and adversely affects the subjective quality of the vehicles. These effects have substantial economic impact on the automotive industry. Furthermore, it is essential to properly treat the brake squeal problems in order to avoid unexpected catastrophic failure of the brake system. In this paper, it is proposed to mitigate the brake squeal problems by providing the brake pads with piezoelectric patches which are shunted by properly tuned electric networks. The shunted piezoelectric pads offer a unique ability to convert the mechanical energy induced by the brake squeal into electrical energy which can be dissipated into the network in order to enhance the damping and stability characteristics of the brake system. Accordingly, it is envisioned that the proposed approach would enable the disc brake systems to operate over broad ranges of operating parameters without experiencing the adverse effects of brake squeal. The proposed system is modeled by a simple two Degree-Of-Freedom (DOF) disc brake model. The structural DOF are integrated with the constitutive model of the shunted piezoelectric network in order to predict the threshold of brake squeal. The stability limits of the proposed brake system are established as a function of the design parameters of the shunted piezoelectric network. Numerical examples are presented to demonstrate the effectiveness of the proposed system in expanding the operating range of the brake system without experiencing squeal problems. Application of the proposed system to a distributed disc brake system model is a natural extension of the present work.

Coupled Blade Bending and Torsional Shaft Vibration in Turbomachinery

1993 ◽  
Author(s):  
U. Schaber ◽  
J. F. Mayer ◽  
H. Stetter
Keyword(s):  
Finite Element ◽  
Forced Vibration ◽  
Vibration Analysis ◽  
Element Model ◽  
Electrical Network ◽  
Design Parameters ◽  
Parameter Study ◽  
Mass Relation ◽  
Turbine Generator ◽  
Beam Elements

The forced vibration of turbomachinery blading induced by torsional vibration of the rotor shaft is investigated. Torsional shaft vibrations, caused for example by disturbances in the electrical network, jeopardize the long blades in low pressure stages of steam and gas turbine generator rotors. A simple finite element model consisting of beam elements is used to calculate free and forced vibration. A parameter study has been performed to show the influence of design parameters like mass relation and eigenfrequency relation of the uncoupled system parts. The vibration analysis of a large steam turbine generator rotor is presented.

scholarly journals Monitoring of Selected Physical and Chemical Parameters of Test Oil in the Wet Disc Brake System

2020 ◽  
Vol 23 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Juraj Jablonický ◽  
Mirko Simikić ◽  
Juraj Tulík ◽  
Milan Tomić ◽  
Ľubomír Hujo ◽  
...  
Keyword(s):  
Physical Properties ◽  
Negative Impact ◽  
Chemical Properties ◽  
Fluorescence Analysis ◽  
Acid Number ◽  
Brake System ◽  
Disc Brake ◽  
Operational Tests ◽  
Negative Effect ◽  
Physical And Chemical

AbstractPaper presented is focused on the operating measurements of a tractor wet disc brake system. Operating measurements were evaluated after tractor’s operation at 500 Mth on the 3rd, 4th and 5th gear. Reference fluid and ecological fluid were tested during operation. In addition, work results include the evaluation of the fluid samples taken during the operational tests to monitor the tractor braking performance with wet disc brakes. Fluid samples were also tested in order to determine the changes in their physico-chemical properties. Chemical analysis was performed for both oil samples by means of X-ray fluorescence analysis according to the DIN 51829 and DIN 51399-2. Observed physical properties of the tested oils – density, viscosity, acid number, water content – were within the appropriate ranges after the end of test. Further analysis was focused on an amount of abrasive metals, contaminants, additives, and other important elements. On the basis of analyses conducted, it can be concluded that majority of elements preserved their original level showed at the 0 reference hour sample. In terms of the abrasion metals, an increase in their presence was not found. Furthermore, analysis of the physical properties of tested fluids did not prove their negative impact on the tractor wet disc brake system. Results of the operating measurements suggest that neither the applied conference fluid nor the ecological fluid showed negative effect on the minimum braking value. The minimum braking deceleration was implemented in accordance with the Law no. 106/2018.

Suppression of Brake Squeal Using Shunted Piezoceramics

2006 ◽  
Author(s):  
Marcus Neubauer ◽  
Robert Oleskiewicz
Keyword(s):  
Stability Analysis ◽  
Multibody System ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Disc Brake ◽  
Negative Capacitance ◽  
Brake Squeal ◽  
Considerable Effort ◽  
Analytical Stability ◽  
Unique Ability

Due to increased interest in comfort features, considerable effort is spent by brake manufacturers in order to suppress brake squeal. This process can be shortened by eliminating the remaining squealing with shunted piezoceramics that are embedded into the brake system. The piezoceramic offers the unique ability to convert mechanical energy into electrical energy and vice versa. The damping performance is determined by the connected shunt. This paper presents a multibody system of a brake, which is capable to reproduce the important features of brake squeal. It includes the dynamics of a piezoceramic that is shunted with a passive LR shunt or a negative capacitance LRC shunt. Analytical stability analysis are carried out to obtain optimal shunt parameters. The performance increase with a negative capacitance is studied in detail. The simulations are validated with measurements on an automotive disc brake.

scholarly journals Influence of Material-Dependent Damping on Brake Squeal in a Specific Disc Brake System

2021 ◽  
Vol 11 (6) ◽  
pp. 2625
Author(s):  
Juraj Úradníček ◽  
Miloš Musil ◽  
L’uboš Gašparovič ◽  
Michal Bachratý
Keyword(s):  
Dynamic Instability ◽  
Friction Material ◽  
System Stability ◽  
Brake System ◽  
Brake Disc ◽  
Disc Brake ◽  
Fe Model ◽  
Brake Squeal ◽  
Friction Forces ◽  
General Material

The connection of two phenomena, nonconservative friction forces and dissipation-induced instability, can lead to many interesting engineering problems. We study the general material-dependent damping influence on the dynamic instability of disc brake systems leading to brake squeal. The effect of general damping is demonstrated on minimal and complex models of a disc brake. Experimental analyses through the frequency response function (FRF) show different damping of the brake system coalescent modes, indicating possible dissipation-induced instability. A complex system including material-dependent damping is defined in commercial finite element (FE) software. A FE model validated by experimental data on the brake-disc test bench is used to compute the influence of a pad and disc damping variations on the system stability using complexe igenvalue analysis (CEVA). Numerical analyses show a significant sensitivity of the experimentally verified unstable mode of the system to the ratio of the damping between the disc and the friction material components.

scholarly journals Mechanism Analysis of a Low-Frequency Disc Brake Squeal Based on an Energy Feed-In Method for a Dual Coupling Subsystem

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yidong Wu
Keyword(s):  
Vibration Mode ◽  
Low Frequency ◽  
Element Model ◽  
Disc Brake ◽  
Mechanism Analysis ◽  
Brake Squeal ◽  
Complex Mode ◽  
Vehicle Noise ◽  
Complex Modal Analysis ◽  
The Difference

Brake squeal is a major component of vehicle noise. To explore the mechanism of the low-frequency brake squeal, a finite element model of an automobile disc brake was established, and a complex mode numerical simulation was performed. According to the unstable modes stemming from the complex modal analysis results, the low-frequency range brake squeal can be determined. Based on an energy feed-in method, the coupling subsystems of the piston-caliper and the disc-pad were established, and a calculation formula for the feed-in energy of the dual coupling subsystem was derived. The results showed that when the feed-in energy of the dual coupling subsystem is close to zero, the complex mode cannot be excited at the corresponding frequency. In addition, the difference in feed-in energy between the two coupling subsystems is positively correlated with the probability of the brake squeal, which can be used to determine the complex mode under which the brake squeal may occur. The greater the feed-in energy of a coupling subsystem is, the more likely it is that the maximum brake vibration mode will appear at this subsystem or its adjacent parts. The increase in brake oil pressure will eliminate some lower-frequency sounds but will not change the frequency of the original low-frequency brake squeals.

scholarly journals Effective Thermo-Structural Analysis for Disc Brake System Simulation

2018 ◽  
Vol 68 (2) ◽  
pp. 125-130
Author(s):  
Pavel Kraus ◽  
Juraj Úradníček ◽  
Miloš Musil ◽  
Michal Bachratý
Keyword(s):  
Thermal Effects ◽  
Transient Analysis ◽  
Standard Procedure ◽  
Computing Time ◽  
Element Model ◽  
Brake System ◽  
Disc Brake ◽  
Disk Brake ◽  
Pin On Disc ◽  
Fully Coupled

AbstractThe evaluation of disk brake squeal is nowadays performed using Finite Element Model. In this standard procedure the thermal effects are omitted. The omission is done because of long computing time of fully coupled brake system thermo-structural transient analysis. This paper is presenting an effective uncoupled thermo-structural FEM procedure. This method is applied on a pin-on-disc system and its time effectiveness is compared to standard full coupled transient analysis.

A Study of Squeal Noise in Vehicle Brake System

2011 ◽  
Author(s):  
Xu Wang ◽  
Sabu John ◽  
He Ren
Keyword(s):  
Experimental Tests ◽  
Brake System ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Squeal ◽  
Design Changes ◽  
Brake Application ◽  
Unstable Vibration ◽  
Squeal Noise ◽  
Brake Noise

Disc brake squeal can be classified as a form of friction-induced vibration. Eliminating brake noise is a classic challenge in the automotive industry. This paper presents methods for analyzing the unstable vibration of a car disc brake. The numerical simulation has been conducted, and its results are compared with those from the experimental tests. The root causes of brake squeal noise will be identified. Potential solutions for elimination of the brake squeal noise will be proposed. Firstly, new materials and technologies for the disc brake application will be explored, secondly, it will be illustrated how to avoid the brake squeal noise problem from the brake system design. Brake disc design changes for improving cooling performance, and service solutions for brake squeal noise will be presented.

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