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.

Vibration Modal Analysis of the Active Magnetic Bearing System

2010 ◽  
Vol 458 ◽  
pp. 137-142
Author(s):  
Hong Ya Fu ◽  
Ping Fan Liu ◽  
Qing Chun Zhang ◽  
Y.T. Wang
Keyword(s):  
Modal Analysis ◽  
Vibration Mode ◽  
Element Model ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Active Magnetic Bearing ◽  
Flexible System ◽  
The Difference ◽  
Identification Analysis ◽  
Vibration Modal

Based on the principle of axial active magnetic bearing rotor-system with single degree of freedom, magnetic rotor-system vibration mode was described. A 3D finite element model of active magnetic bearing rotor-system was established by ANSYS11. Initial six order natural frequencies and vibration mode were calculated by the module of modal analysis of ANSYS11, and compared with the results of system identification. Analysis shows that there was a certain difference between the results, but the difference was small. The analysis result indicates that it is an effective method to apply FEA in the design of the active magnetic bearing. It provided the foundation for structure optimal design of the system and theoretical basis for flexible system design.

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

Distinction of the Property of Low Frequency Oscillation Based on ARMA Mode Identification

2013 ◽  
Vol 336-338 ◽  
pp. 1086-1091 ◽  
Author(s):  
Lian Tu ◽  
Di Chen Liu ◽  
Qing Fen Liao ◽  
Fei Fei Dong ◽  
Xing Pei Ji ◽  
...  
Keyword(s):  
Damping Ratio ◽  
Low Frequency ◽  
Arma Model ◽  
Recursive Least Squares ◽  
Mechanism Analysis ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Mode Identification ◽  
Negative Damping ◽  
The Difference

Aiming at how to solve the question of quantitatively distinguish negative damping low frequency oscillation and forced power oscillation, the difference in frequency and damping ratio between the two kinds of oscillations have been discovered through mechanism analysis, and a new quantitative distinction criterion for the property of the low frequency is proposed. The oscillation data is windowing identified by ARMA model based on weighted recursive least squares algorithm dynamically, and low frequency type can be distinguished according to the changes of oscillation frequency and damping ratio during the oscillation. The simulative results have shown that the method is feasible and effective.

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.

scholarly journals Optimal Design of Brake Disc Structures for Brake Squeal Suppression

2021 ◽  
Vol 2101 (1) ◽  
pp. 012026
Author(s):  
Gongyu Pan ◽  
Zhikang Liu ◽  
Qizhao Xu ◽  
Lin Chen
Keyword(s):  
Response Surface ◽  
Optimization Design ◽  
Design Method ◽  
Structural Parameters ◽  
Element Model ◽  
Bench Test ◽  
Surface Model ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Squeal

Abstract Aiming at the brake squeal problem of automobile disc brakes, an optimization design method of brake disc structure based on the weighted brake squeal tendency coefficient is proposed. This method is based on the brake squeal complex modal finite element model of a certain disc brake. Based on the validity of the model verified by the bench test, the single-sided disc surface height of the brake disc, the height of the radiating rib, the elastic modulus and the disc are selected. The four key structural parameters of the cap height are used as design variables. Taking the weighted braking squeal tendency coefficient proposed in this paper as the optimization target, the response surface method and the central composite test design are combined to construct a weighted braking squeal tendency coefficient response surface model, and use multi-island genetic algorithm to optimize the model. The results show that the optimization design method proposed in this paper can greatly improve the optimization efficiency while effectively reducing the screaming tendency of the disc brake in the full frequency band, so as to achieve the purpose of improving the NVH performance of the disc brake and improving the comfort of the car.

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

Modal Experiment Research on Fluid-Solid Coupling Vibration of Hydraulic Long-Straight Pipeline of Shield Machine

2011 ◽  
Vol 105-107 ◽  
pp. 286-293 ◽  
Author(s):  
Jing Hua Xie ◽  
Ke Tian ◽  
Li He ◽  
Tian Ren Yang ◽  
Xiang Heng Zhu
Keyword(s):  
Natural Frequency ◽  
Natural Frequencies ◽  
Vibration Mode ◽  
Vertical Plane ◽  
Low Frequency ◽  
Pipeline System ◽  
Experiment Research ◽  
Coupling Vibration ◽  
The Difference ◽  
Shield Machine

The hydraulic long-straight pipeline system of the shield machine is to be studied in this paper. Modal parameters of the hydraulic long-straight pipeline whose length is 8m under three kinds of spans (single span, double spans and four spans) were measured and analyzed. Considering the inherent vibration characteristics of the shield machine, we limited the natural frequency of the multi-span long straight pipeline studied within the range of 0~ 200Hz.What the experiment shows is as follows: Firstly, the natural frequency of the hydraulic long-straight pipeline is densely distributed mainly in the low frequency; Secondly, the natural frequencies of vibration in the horizontal plane are slightly higher than those of corresponding orders in the vertical plane, although the difference is little; In addition, by increasing the number of supports, pipeline span can be reduced and the natural frequencies of pipeline can be significantly increased, but this will make the vibration mode change irregularly.

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