scholarly journals Influence of the Dry Friction Suspension System Characteristics on the Stick-Slip of Vertical Vibration of a Three-Piece Bogie

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Dali Lyu ◽  
Qichang Zhang ◽  
Kewei Lyu ◽  
Jiaxing Liu ◽  
Yulong Li
Keyword(s):  
Numerical Method ◽  
Dry Friction ◽  
Wedge Angle ◽  
Vertical Vibration ◽  
Vibration Damping ◽  
Suspension System ◽  
Railway Vehicle ◽  
Stick Slip ◽  
System Frequency ◽  
Dry Friction Damping

The dry friction structure is a commonly used vibration-damping method for railway vehicles. Insufficient vibration damping performance will cause excessive vibration of the vehicle, which is not conducive to the safety of the vehicle. However, the mechanism of vibration damping and the cause of clamping stagnation have not been well resolved. This paper uses the analytical method, numerical method, and finite element method to analyze the vertical dynamic characteristics of the simple suspension system with dry friction and demonstrates that the numerical method is an effective method to study the dry model. The conditions for the system to produce sticking events were analyzed by the numerical method. The analysis shows that the system's excitation is too small, which causes clamping stagnation to the system. The reduction of the wedge angle and the friction coefficient are conducive to eliminating sticking. A negative side frame angle is conducive to reducing the high-frequency energy of the excitation. Decreasing spring stiffness or increasing system mass to reduce system frequency can reduce sticking events. The mutual verification of different methods confirms the correctness of the analysis method and analyzes the cause of sticking or clamping stagnation from the mechanism, which provides a new idea for the design and improvement of the dry friction damping system of railway vehicle bogies.

Experimental Study of Dynamic Characteristics of Dry Friction Damping of Turbine Blade Steel

2013 ◽  
Vol 690-693 ◽  
pp. 1979-1982 ◽  
Author(s):  
Peng Fei Zhao ◽  
Qiang Zhang ◽  
Jun Wu ◽  
Di Zhang
Keyword(s):  
Dry Friction ◽  
Turbine Blades ◽  
Initial Pressure ◽  
Relative Displacement ◽  
Radius Of Curvature ◽  
Response Analysis ◽  
Friction Damper ◽  
Friction Damping ◽  
Stick Slip ◽  
Dry Friction Damping

For lot of structures, especially turbine blades, damper can dissipate the vibration energy by friction. Investigating the property of metal dry friction damping can give many usable data for response analysis of damping blade which is important in damped blade designs. The paper constructs an experimental rig and carries out experiment with pieces having radius of curvature 6mm, 12mm and 24mm. The relative displacement between contact surfaces and the friction force changed with time were obtained for different initial pressure and frequency of exciting force. Hysteresis curves of dry friction damper were derived. The variations of friction coefficient of stick-slip area, equivalent stiffness and equivalent damping were calculated based on experimental data.

scholarly journals Dry Friction Damping Mechanisms in Engine Blades

1982 ◽  
Author(s):  
A. V. Srinivasan ◽  
D. G. Cutts
Keyword(s):  
Laboratory Test ◽  
Test Data ◽  
Dry Friction ◽  
Turbine Blades ◽  
Experimental Studies ◽  
Vibration Damping ◽  
Analytical Models ◽  
Jet Engines ◽  
Blade Vibration ◽  
Dry Friction Damping

In the context of jet engines, significant vibration damping due to dry friction can occur at (a) shroud interfaces of fans and (b) the platform of turbine blades fitted with “platform dampers.” Analytical and experimental studies in regard to this important source of nonaerodynamic damping of blade vibration are presented in this paper. Comparisons between results from analytical models and laboratory test data are made and discussed.

Twin Shaft Rotor System Vibration Damping Experimental Investigation

2015 ◽  
Vol 752-753 ◽  
pp. 918-921
Author(s):  
M.Sh. Nikhamkin ◽  
S.V. Semenov ◽  
G.V. Mekhonoshin ◽  
I.V. Semenova ◽  
N.A. Sazhenkov
Keyword(s):  
Experimental Investigation ◽  
Model Test ◽  
Dry Friction ◽  
Coulomb Friction ◽  
Vibration Damping ◽  
Friction Damper ◽  
Test Rig ◽  
Rotor Shaft ◽  
System Vibration ◽  
Dry Friction Damping

The influence of dry friction damping on twin shaft model test rig vibration experimental investigation is presented. Experimental investigation method is devised and tested at the work. Dry and Coulomb friction damper is developed. The efficiency of damping is evaluated quantitatively via rotor shaft vibration displacements amplitude determining.

Dry Friction Damping Mechanisms in Engine Blades

1983 ◽  
Vol 105 (2) ◽  
pp. 332-341 ◽  
Author(s):  
A. V. Srinivasan ◽  
D. G. Cutts
Keyword(s):  
Laboratory Test ◽  
Test Data ◽  
Dry Friction ◽  
Turbine Blades ◽  
Experimental Studies ◽  
Vibration Damping ◽  
Analytical Models ◽  
Jet Engines ◽  
Blade Vibration ◽  
Dry Friction Damping

In the context of jet engines, significant vibration damping due to dry friction can occur at (a) shroud interfaces of fans and (b) the platform of turbine blades fitted with “platform dampers.” Analytical and experimental studies in regard to this important source of nonaerodynamic damping of blade vibration are presented in this paper. Comparisons between results from analytical models and laboratory test data are made and discussed.

Study of Characteristics of Dry Friction Damping.

1985 ◽  
Author(s):  
A. V. Srinivasan ◽  
B. N. Cassenti ◽  
D. G. Cutts
Keyword(s):  
Dry Friction ◽  
Friction Damping ◽  
Dry Friction Damping

Energy Balancing Method to Identify Nonlinear Damping of Bolted-Joint Interface

2016 ◽  
Vol 693 ◽  
pp. 318-323 ◽  
Author(s):  
Xin Liao ◽  
Jian Run Zhang
Keyword(s):  
Dry Friction ◽  
Harmonic Excitation ◽  
Joint Interface ◽  
Damping Factor ◽  
Viscous Damping ◽  
Bolted Joint ◽  
Energy Balancing ◽  
Stick Slip ◽  
Non Linear ◽  
Linear Damping

The interface of bolted joint commonly focuses on the research of non-linear damping and stiffness, which affect structural response. In the article, the non-linear damping model of bolted-joint interface is built, consisting of viscous damping and Coulomb friction. Energy balancing method is developed to identify the dry-friction parameter and viscous damping factor. The corresponding estimation equations are acquired when the input is harmonic excitation. Then, the vibration experiments with different bolted preloads are conducted, from which amplitudes in various input levels are used to work out the interface parameters. Also, the fitting curves of dry-friction parameters are also obtained. Finally, the results illustrate that the most interface of bolted joint in lower excitation levels occurs stick-slip motion, and the feasibility of the identification approach is demonstrated.

The Investigation of the Influence of Structure Parameters on the Friction-Induced Self-Excited Vibration

2011 ◽  
Vol 66-68 ◽  
pp. 933-936
Author(s):  
Xian Jie Meng
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Method ◽  
Calculation Result ◽  
Dry Friction ◽  
Vibration Amplitude ◽  
The Self ◽  
Structure Parameters ◽  
Dynamics Model ◽  
Excited Vibration ◽  
Nonlinear Dynamics Model

A one degree of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction was built firstly, the numerical method was taken to study the impacts of structure parameters on self-excited vibration. The calculation result shows that the variation of stiffness can change the vibration amplitude and frequency of the self-excited vibration, but can not eliminate it, Along with the increase of system damping the self-excite vibration has the weakened trend and there a ritical damping, when damping is greater than it the self-excite vibration will be disappeared.

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