Brake Squeal Noise Due to Disk Misalignment

2005 ◽  
Author(s):  
Yeon-Sun Choi ◽  
Ju-Pyo Park
Keyword(s):  
Stability Analysis ◽  
Degree Of Freedom ◽  
Experimental Results ◽  
Brake System ◽  
Nonlinear Friction ◽  
Brake Squeal ◽  
Friction Characteristic ◽  
Brake Dynamometer ◽  
Three Degree Of Freedom ◽  
Squeal Noise

To understand brake squeal noise, the sound and vibration of an automobile brake system were measured using a brake dynamometer. The experimental results show that an important factor in squeal generation is the run-out due to disk misalignment. A three-degree of freedom model is developed for the brake system, where the run-out effect and nonlinear friction characteristic are included. A stability analysis of the model was also performed to predict the generation of squeal with the modification of the brake system. The results show that squeal generation is dependant on the run-out rather than the friction characteristic between pad and disk.

Brake squeal noise due to disc run-out

2007 ◽  
Vol 221 (7) ◽  
pp. 811-821 ◽  
Author(s):  
J-P Park ◽  
Y-S Choi
Keyword(s):  
Stability Analysis ◽  
Degrees Of Freedom ◽  
Experimental Results ◽  
Brake System ◽  
Brake Squeal ◽  
Friction Characteristic ◽  
Linear Friction ◽  
Brake Dynamometer ◽  
Squeal Noise ◽  
Three Degrees Of Freedom

To understand brake squeal noise, the sound and vibration of an automobile brake system were measured using a brake dynamometer. The experimental results show that an important factor in squeal generation is the run-out due to disc misalignment. A three-degrees-of-freedom model is developed for the brake system, where the run-out effect and non-linear friction characteristic are included. A stability analysis of the model was also performed to predict the generation of squeal with the modification of the brake system. The results show that squeal generation is dependent on the run-out rather than the friction characteristic between the pad and disc.

Instabilities Arising From the Frictional Interaction of a Pin-Disk System Resulting in Noise Generation

1976 ◽  
Vol 98 (1) ◽  
pp. 81-86 ◽  
Author(s):  
S. W. E. Earles ◽  
C. K. Lee
Keyword(s):  
Angular Speed ◽  
Degree Of Freedom ◽  
Noise Generation ◽  
Disk System ◽  
Single Degree Of Freedom ◽  
Disk Brake ◽  
Thin Steel ◽  
Three Degree Of Freedom ◽  
Squeal Noise ◽  
Experimental Rig

A steel pin, supported on a flexible cantilever, is pressed against a thin steel disk which rotates at a uniform angular speed. The orientation of the pin’s central axis to the plane of the disk, the bending and torsional stiffnesses of the pin support, the stiffness of the disk, and the line of action of the resultant interactive force are all shown to affect the self-induced coupled frequencies and modes generated. The analysis of the experimental arrangement in terms of a three-degree-of-freedom pin subsystem and a single-degree-of-freedom disk element suggests that the system is unstable for certain combinations of the variables. The instabilities are shown to belong to a class of “geometrically induced” or “kinematic constraint” instability. The region of squeal-noise generation within the experimental rig is shown to correspond to the oscillatory unstable region predicted theoretically. The noise generated is similar to disk-brake squeal, and so the work furthers the understanding of this practical problem.

Advanced Vibration Control of Atomic Force Microscope Scanner

2015 ◽  
pp. 84-106
Author(s):  
Sajal K. Das ◽  
Hemanshu R. Pota ◽  
Ian R. Petersen
Keyword(s):  
Vibration Control ◽  
Atomic Force Microscope ◽  
Atomic Level ◽  
Degree Of Freedom ◽  
Experimental Results ◽  
Surface Imaging ◽  
Atomic Force Microscopes ◽  
Atomic Force ◽  
Three Degree Of Freedom ◽  
Damping Controller

Atomic Force Microscopes (AFMs) are used in many nanopositioning applications in order to measure the topography of various specimens at an atomic level through surface imaging. The imaging of the samples in AFMs is carried out by using a three degree-of-freedom positioning unit called Piezoelectric Tube Scanner (PTS). The performance of the AFM mostly depends on the performance of the PTS. However, the PTS of the AFM suffers from the problem of vibration. This chapter presents a design of a damping controller to compensate the induced vibration of the scanner. Experimental results are presented to show the effectiveness of the proposed controller. The experimental results show that the proposed controller is able to compensate 90% of the vibration of the PTS.

A Stability Analysis of the Wheel Shimmy

2012 ◽  
Author(s):  
Giandomenico Di Massa ◽  
Stefano Pagano ◽  
Salvatore Strano ◽  
Mario Terzo
Keyword(s):  
Stability Analysis ◽  
Degree Of Freedom ◽  
Experimental Investigations ◽  
Classical Stability ◽  
Low Degree ◽  
Oscillation Modes ◽  
Non Linear ◽  
The Stability ◽  
Three Degree Of Freedom ◽  
Wheel Shimmy

The wheel shimmy is a classical non-linear problem. The most frequently used approach to study this phenomena is based on linearized low degree of freedom models, that from one side, thanks the simplicity of the equations of the motion, allows to evaluate the stability with classical stability-analysis approach, but from the other side it limits the study about the equilibrium point. In this paper a stability-analysis, based on a three degree of freedom non-linear analytical model, is presented. Starting from the system numerical response, adopting a time-domain modal analysis method, the modal parameters were identified. The proposed procedure, through a 3 degree of freedom nonlinear representation of the castor, highlights the three main castor oscillation modes whose characteristics can then be identified with a method applicable even for experimental investigations.

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.

Effects of External Hard Particles on Brake Noise of Disc Braking System

2013 ◽  
Vol 388 ◽  
pp. 213-216 ◽  
Author(s):  
M.A. Nasaruddin ◽  
Mohd Kameil Abdul Hamid ◽  
Ahmad Razimi Mat Lazim ◽  
Abd Rahim Abu Bakar
Keyword(s):  
Sound Level ◽  
Fast Fourier Transformation ◽  
Disc Brake ◽  
Brake Squeal ◽  
Rotating Disc ◽  
Open Design ◽  
Hard Particles ◽  
Noise Data ◽  
Brake Dynamometer ◽  
Squeal Noise

The open design and position of disc brake that is closed to road surfaces enable contaminants to enter the brake gap and caused noise and tribological disturbance at the brake interface. Contaminants such as dirt and soil can be present and are expected to influence the occurrence of brake squeal that produce an annoying sound during braking action. The objective of this study was to examine the effect of external hard particles at different disc sliding speed on generation of brake squeal using a brake dynamometer. Different rotational speed of disc brake was selected and the experiments squeal noise data was collected and analyzed using the Fast Fourier Transformation (FFT) analyzer. From the experiments, the presence of external particle and the rotation speed of disc brake promotes the generation of brake squeal phenomenon by changing the surface roughness and effective contact of brake interface. Results obtained from the experiment also showed that higher rotating disc generate higher sound level meter or squeal frequency and increase numbers of squeal noise generated.

Piezoelectric-based dither control for automobile brake squeal suppression under various braking conditions

2020 ◽  
pp. 107754632095676
Author(s):  
HweeKwon Jung ◽  
Gyuhae Park ◽  
Jeong Kyu Kim
Keyword(s):  
Automotive Industry ◽  
High Frequency ◽  
Experimental Investigations ◽  
Disc Brake ◽  
Nonlinear Friction ◽  
Frequency Range ◽  
Brake Squeal ◽  
Squeal Noise ◽  
Piezoelectric Stack Actuator ◽  
Friction Induced Vibration

Automobile brake squeal noise, which is nonlinear, friction-induced vibration in the frequency range 1–16 kHz, still remains a major problem for the automotive industry. This article presents analytical and experimental investigations into the application of dither control for active suppression of automobile disc brake squeal. Dither is a concept of active control that introduces high-frequency actuation into a system to suppress a much lower frequency disturbance. In this study, a specially designed brake system is built, in which a piezoelectric stack actuator in the piston of a floating caliper brake applies the dither input. In the experiments, squeal noise generated under the drag mode and various dynamic modes are considered. The results indicate that this piezoelectric-based dither control could effectively suppress the brake squeal noise by 5–10 dB and the squeal occurrence by up to 60% under various braking conditions.

scholarly journals Analysis of Friction-Induced Vibration Leading to Brake Squeal Using a Three Degree-of-Freedom Model

2017 ◽  
Vol 65 (3) ◽  
Author(s):  
Hongming Lyu ◽  
Stephen James Walsh ◽  
Guangxiong Chen ◽  
Lijun Zhang ◽  
Kuncai Qian ◽  
...  
Keyword(s):  
Degree Of Freedom ◽  
Brake Squeal ◽  
Three Degree Of Freedom ◽  
Friction Induced Vibration

Experiments With the Powered Arm Cobot

2004 ◽  
Author(s):  
Songho Kim ◽  
Michael Peshkin ◽  
J. Edward Colgate
Keyword(s):  
Degree Of Freedom ◽  
Experimental Results ◽  
Free Motion ◽  
Human Operator ◽  
Physical Interaction ◽  
Motion Controller ◽  
Passive Device ◽  
Direct Physical Interaction ◽  
Virtual Paths ◽  
Three Degree Of Freedom

The Arm cobot is a three degree-of-freedom manipulator intended for direct physical interaction with a human operator. The Arm cobot can operate as a passive device, such that the cobot sets the end-effector’s allowed direction of motion, while the human operator provides all motive forces. Previous work with the passive Arm cobot involved displaying free motion and virtual paths and surfaces. This paper presents experimental results with a powered Arm cobot. In one experiment, the Arm cobot is commanded to track a user-defined trajectory, while in another experiment, we show an improved free motion controller.

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