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.

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 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.

Stability Analysis of a Vibrational System Subject to Negative Viscous Damping and Displacement-Dependent Dry Friction Damping

2003 ◽  
Author(s):  
Aldo A. Ferri ◽  
Wayne E. Whiteman
Keyword(s):  
Stability Analysis ◽  
Friction Force ◽  
Dry Friction ◽  
Effective Means ◽  
Viscous Damping ◽  
Friction Damper ◽  
Friction Damping ◽  
Fan Blade ◽  
The Stability ◽  
Dry Friction Damping

A stability analysis is conducted of an autonomous single-degree-of-freedom system damped with negative viscous damping and a displacement-dependent Coulomb friction force. The geometry of the dry friction damping element yields a friction force that grows linearly with the system displacement. The most direct application of this system is in the study of a turbomachinery blade with shroud interfaces designed to achieve this geometry. Recent studies have shown that the damping of systems with this type of displacement-dependent dry friction force resembles linear structural damping and suggests that this arrangement may be an effective means of flutter suppression in these turbine and fan blade applications. For this study, the inclusion of negative viscous damping is used in order to approximate destabilizing aerodynamic forces. An exact analysis is conducted to determine the stability of this autonomous system. Results show that energy losses from the displacement-dependent dry friction damper are large enough to achieve local and even global stability under certain conditions.

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.

Experimental Investigation on the Forced Response of a Dummy Counter Rotating Turbine Stage With Friction Damping

2012 ◽  
Author(s):  
Teresa Berruti ◽  
Vanni Maschio ◽  
Paolo Calza
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Dry Friction ◽  
Vibration Damping ◽  
Forced Response ◽  
Test Results ◽  
Turbine Stage ◽  
Friction Damping ◽  
Experimental Activity ◽  
Open Rotor

The paper shows the results of the experimental activity about the dynamics of a stage of a counter rotating turbine of an open rotor architecture engine. The tests here presented explore the dynamic behavior of a simplified counter-rotating turbine stage. The test results show the dynamic behavior of a counter rotating turbine stage and highlight the importance of the presence of dry friction for vibration damping.

Experimental Investigation on the Forced Response of a Dummy Counter-Rotating Turbine Stage With Friction Damping

2012 ◽  
Vol 134 (12) ◽  
Author(s):  
Teresa Berruti ◽  
Vanni Maschio
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Dry Friction ◽  
Vibration Damping ◽  
Forced Response ◽  
Test Results ◽  
Turbine Stage ◽  
Friction Damping ◽  
Experimental Activity ◽  
Open Rotor

The paper shows the results of the experimental activity about the dynamics of a stage of a counter-rotating turbine of an open rotor architecture engine. The tests presented here explore the dynamic behavior of a simplified counter-rotating turbine stage. The test results show the dynamic behavior of a counter-rotating turbine stage and highlight the importance of the presence of dry friction for vibration damping.

Effect of Intentional Dry Friction Damping on the Performance of an Elastomeric Engine Mount

2010 ◽  
Author(s):  
Caner Boral ◽  
Ender Cig˘erog˘lu ◽  
I˙brahim Korkmaz
Keyword(s):  
Dry Friction ◽  
Vibration Isolation ◽  
Wide Frequency Range ◽  
Friction Damper ◽  
Friction Damping ◽  
Automotive Engine ◽  
Engine Mounts ◽  
Initial Cost ◽  
Engine Mount ◽  
Dry Friction Damping

Automotive engine mounts are used to protect engine from road irregularities and to isolate transmission of vibrations created by the engine which have a drastic effect on the noise generated inside the passenger cabin. Most common types of engine mounts are elastomeric and hydraulic mounts, the former having better vibration isolation characteristics whereas the latter displays better shock isolation. Elastomeric mounts are widely used for their low initial cost, while hydraulic mounts with inertia track and decoupler are chosen for their good vibration isolation and shock excitation characteristics. However, hydraulic mounts with inertia track and decoupler are not appropriate for small segment and commercial vehicles due to their high initial cost. In this paper, the effect of the addition of a dry friction damper on the performance of elastomeric automobile engine mounts is investigated. Results showed that addition of dry friction damping to the elastomeric engine mount significantly improves the transmissibility throughout a wide frequency range where the best results are obtained at the resonance frequency.

Sign in / Sign up

Export Citation Format

Share Document