scholarly journals On low frequency disc-brake vibrations

PAMM ◽  
2005 ◽  
Vol 5 (1) ◽  
pp. 95-96 ◽  
Author(s):  
H. Hetzler ◽  
W. Seemann
Keyword(s):  
Low Frequency ◽  
Disc Brake

Analysis for Reducing Low Frequency Squeal of Disc Brake

2001 ◽  
Author(s):  
Yoichi Kumemura ◽  
Yoshikazu Gamo ◽  
Kimiyasu Kono ◽  
Satoru Suga
Keyword(s):  
Low Frequency ◽  
Disc Brake

Friction Induced Brake Vibrations at Low Speeds: Experiments, State-Space Reconstruction and Implications on Modeling

2006 ◽  
Author(s):  
Hartmut Hetzler ◽  
Wolfgang Seemann
Keyword(s):  
Classical Model ◽  
A Priori ◽  
Experimental Studies ◽  
Low Frequency ◽  
Disc Brake ◽  
Minimal Models ◽  
Stick Slip ◽  
Cast Doubt ◽  
Vibration Pattern ◽  
Embedding Methods

Today, low frequency disc-brake noises are commonly explained as self-sustained stick-slip oscillations. Although, at a first glance this explanation seems reasonable, there are indices that cast doubt on it. For instance, the basic frequency of the observed oscillations does not scale with the disc-speed as it is with stick-slip oscillations and the classical model does not explain the observed ending of the vibrations beyond a certain speed. Indeed, our experimental studies on groaning noises reveal two different vibration patterns: stick-slip vibrations at almost vanishing relative speed and a second, differing vibration pattern at low to moderate relative speeds. Yet, these two patterns produce a very similar acoustic impression. While the experiment provides a vast amount of data, the dimension and structure of the underlying oscillation is not known a priori – hence, constructing phenomenological minimal models usually must rely on assumptions, e.g. about the number of DOF, etc. Due to noise and complexity, the measured raw data did only allow for a first straight forward insight, rendering further analysis necessary. Hence, time-delay embedding methods together with a principle component analysis were used to reconstruct a pseudo-phase space together with the embedded attractor to analyse for the system's dimension and to separate signal from noise.

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.

FE Analysis of Low-frequency Disc Brake Squeal (In Case of Floating Type Caliper)

1998 ◽  
Author(s):  
Toru Matsushima ◽  
Hiroyuki Masumo ◽  
Satoshi Ito ◽  
Massaki Nishiwaki
Keyword(s):  
Low Frequency ◽  
Fe Analysis ◽  
Disc Brake ◽  
Brake Squeal ◽  
Floating Type

FEM Analysis of Low-Frequency Disc Brake Squeal (In Case of Opposed Type Caliper)

1997 ◽  
Author(s):  
Toru Matsushima ◽  
Masaaki Nishiwaki ◽  
Hiroyuki Masumo ◽  
Satoshi Ito
Keyword(s):  
Low Frequency ◽  
Fem Analysis ◽  
Disc Brake ◽  
Brake Squeal
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