An Experimental and Analytical Investigation Into Friction-Induced Vibrations and Parameters Affecting Its Occurrence

2010 ◽  
Author(s):  
A. Bahzad ◽  
M. O. A. Mokhtar ◽  
A. M. A. El-Butch ◽  
A. F. Fahim
Keyword(s):  
Damping Ratio ◽  
Excitation Frequency ◽  
Analytical Investigation ◽  
Load Factor ◽  
Stick Slip ◽  
Single Degree Of Freedom ◽  
Ratio Speed ◽  
Friction Models ◽  
Stick Slip Motion ◽  
Slip Motion

The condition for the occurrence of friction-induced vibrations is examined numerically and experimentally based on a single degree of freedom system with different friction models that relates the friction force with the relative interface speed. In this study the dimensionless parameters which control the occurrence of stick-slip motion are investigated, it is found that some of these parameters results in the occurrence of stick-slip motion while others are acting to avoid it. The equations governing the occurrence of friction-induced vibrations are derived in dimensionless form and solved numerically in order to have both high accuracy and reducing the number of the system parameters. The attained numerical results are validated by the comparison with the experimental results. Results also showed that damping ratio, speed, load factor, the used friction models and excitation frequency greatly affecting the occurrence of stick-slip motion.

The Influence of Friction-Speed Relation on the Occurrence of Stick-Slip Motion

1995 ◽  
Vol 117 (3) ◽  
pp. 450-455 ◽  
Author(s):  
Hsien-I You ◽  
Jeng-Hong Hsia
Keyword(s):  
Damping Ratio ◽  
Negative Slope ◽  
Damping Force ◽  
Stick Slip ◽  
Driving Speed ◽  
Speed Parameter ◽  
Nonuniform Motion ◽  
Stick Slip Motion ◽  
Inversion State ◽  
Slip Motion

A theoretical study of stick-slip motion is provided in the present paper. The study focuses on the influence of the friction-speed relation and the effects of driving speed and damping force of the system on the behavior of the stick-slip motion. The two latter effects are characterized by the speed parameter, Sp, and the damping ratio,ξ, respectively. The results show that, for a system undergoing nonuniform motion, the vibratory frequency increases and the amplitude decreases as the speed parameter increases. For two contacting sliding surfaces, there exists an inversion state at which the stick-slip motion disappears. The magnitude of the negative slope of the friction-speed relation near Vr = 0 is shown to have significant effect on the occurrence of the stick-slip motion.

scholarly journals Effects of friction models on simulation of pneumatic cylinder

2019 ◽  
Vol 10 (2) ◽  
pp. 517-528
Author(s):  
Xuan Bo Tran ◽  
Van Lai Nguyen ◽  
Khanh Duong Tran
Keyword(s):  
Friction Force ◽  
Servo System ◽  
Pneumatic Cylinder ◽  
Lugre Model ◽  
Stick Slip ◽  
Comparison Results ◽  
Pneumatic Servo System ◽  
Friction Models ◽  
Stick Slip Motion ◽  
Slip Motion

Abstract. This study examines effects of three friction models: a steady-state friction model (SS model), the LuGre model (LG model), and the revised LuGre model (RLG model) on the motion simulation accuracy of a pneumatic cylinder. An experimental set-up of an electro-pneumatic servo system is built, and characteristics of the piston position, the pressures in the two-cylinder chambers and the friction force are measured and calculated under different control inputs to the proportional flow control valves. Mathematical model of the electro-pneumatic servo system is derived, and simulations are carried out under the same conditions as the experiments. Comparisons between measured characteristics and simulated ones show that the RLG model can give the best agreement among the three friction models while the LG model can only simulate partly the stick-slip motion of the piston at low velocities. The comparison results also show that the SS model used in this study is unable to simulate the stick-slip motion as well as creates much oscillations in the friction force characteristics at low velocities.

scholarly journals Experimental comparison of five friction models on the same test-bed of the micro stick-slip motion system

2015 ◽  
Vol 6 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Y. F. Liu ◽  
J. Li ◽  
Z. M. Zhang ◽  
X. H. Hu ◽  
W. J. Zhang
Keyword(s):  
Friction Model ◽  
Test Bed ◽  
Lugre Model ◽  
Stick Slip ◽  
Motion System ◽  
Friction Models ◽  
Micro Motion ◽  
Coulomb Friction Model ◽  
Stick Slip Motion ◽  
Slip Motion

Abstract. The micro stick-slip motion systems, such as piezoelectric stick-slip actuators (PE-SSAs), can provide high resolution motions yet with a long motion range. In these systems, friction force plays an active role. Although numerous friction models have been developed for the control of micro motion systems, behaviors of these models in micro stick-slip motion systems are not well understood. This study (1) gives a survey of the basic friction models and (2) tests and compares 5 friction models in the literature, including Coulomb friction model, Stribeck friction model, Dahl model, LuGre model, and the elastoplastic friction model on the same test-bed (i.e. the PE-SSA system). The experiments and simulations were done and the reasons for the difference in the performance of these models were investigated. The study concluded that for the micro stick-slip motion system, (1) Stribeck model, Dahl model and LuGre model all work, but LuGre model has the best accuracy and (2) Coulomb friction model and the elastoplastic model does not work. The study provides contributions to motion control systems with friction, especially for micro stick-slip or step motion systems as well as general micro-motion systems.

Dynamics of stick–slip motion, Whillans Ice Stream, Antarctica

2011 ◽  
Vol 305 (3-4) ◽  
pp. 283-289 ◽  
Author(s):  
J. Paul Winberry ◽  
Sridhar Anandakrishnan ◽  
Douglas A. Wiens ◽  
Richard B. Alley ◽  
Knut Christianson
Keyword(s):  
Stick Slip ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Stick Slip Motion ◽  
Slip Motion

Dynamic simulation of stick–slip motion of a flexible solar array

2008 ◽  
Vol 16 (6) ◽  
pp. 724-735 ◽  
Author(s):  
Yasushi Kojima ◽  
Shigemune Taniwaki ◽  
Yoshiaki Okami
Keyword(s):  
Dynamic Simulation ◽  
Solar Array ◽  
Stick Slip ◽  
Stick Slip Motion ◽  
Slip Motion

scholarly journals Basal ice motion and deformation at the ice-sheet margin, West Greenland

2005 ◽  
Vol 42 ◽  
pp. 67-70 ◽  
Author(s):  
David M. Chandler ◽  
Richard I. Waller ◽  
William G. Adam
Keyword(s):  
Deformation Mode ◽  
Time Intervals ◽  
Stick Slip ◽  
Active Deformation ◽  
West Greenland ◽  
Shear Structures ◽  
Basal Ice ◽  
Ice Velocity ◽  
Stick Slip Motion ◽  
Slip Motion

AbstractMeasurements of basal ice deformation at the margin of Russell Glacier, West Greenland, have provided an opportunity to gain more insight into basal processes occurring near the margin. The basal ice layer comprises a debris-rich, heterogeneous stratified facies, overlain by a comparatively debris-poor dispersed facies. Ice velocities were obtained from anchors placed in both ice facies, at three sites under 5–15 m ice depth. Mean velocities ranged from 20 to 43 m a–1, and velocity gradients indicate high shear strain rates within the basal ice. Stick–slip motion and diurnal variations were observed during measurements at short (1–5 min) time intervals. Vertical gradients in horizontal ice velocity indicate two modes of deformation: (1) viscous deformation within the stratified ice facies, and (2) shear at the interface between the two basal ice facies. Deformation mode 1 may contribute to the folding and shear structures observed in the stratified facies. Deformation mode 2 may generate the stick–slip motion and be associated with the formation of debris bands. Active deformation close to the margin suggests that structures observed within the basal ice are only partially representative of processes occurring near the bed in areas away from the glacier margin.

Experimental Exploration of Schallamach Waves and Self-Excitation in a Belt-Drive System

2018 ◽  
Author(s):  
Yingdan Wu ◽  
Michael Varenberg ◽  
Michael J. Leamy
Keyword(s):  
Angular Velocity ◽  
Dynamic Behavior ◽  
Oscillation Amplitude ◽  
Operating Conditions ◽  
Drive System ◽  
Belt Drive ◽  
Stick Slip ◽  
Stick Slip Motion ◽  
System Inertia ◽  
Slip Motion

We study the dynamic behavior of a belt-drive system to explore the effect of operating conditions and system moment of inertia on the generation of waves of detachment (i.e., Schallamach waves) at the belt-pulley interface. A self-excitation phenomenon is reported in which frictional fluctuations serve as harmonic forcing of the pulley, leading to angular velocity oscillations which grow in time. This behavior depends strongly on operating conditions (torque transmitted and pulley speed) and system inertia, and differs between the driver and driven pulleys. A larger net torque applied to the pulley generally yields more remarkable stick-slip oscillations with higher amplitude and lower frequency. Higher driving speeds accelerate the occurrence of stick-slip motion, but have little influence on the oscillation amplitude. Contrary to our expectations, the introduction of flywheels to increase system inertia amplified the frictional disturbances, and hence the pulley oscillations. This does, however, suggest a way of facilitating their study, which may be useful in follow-on research.

scholarly journals A geophone wireless sensor network for investigating glacier stick-slip motion

2017 ◽  
Vol 105 ◽  
pp. 103-112 ◽  
Author(s):  
Kirk Martinez ◽  
Jane K. Hart ◽  
Philip J. Basford ◽  
Graeme M. Bragg ◽  
Tyler Ward ◽  
...  
Keyword(s):  
Wireless Sensor Network ◽  
Sensor Network ◽  
Wireless Sensor ◽  
Stick Slip ◽  
Stick Slip Motion ◽  
Slip Motion
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