Empirical Characterization of friction parameters for Nonlinear Stick-slip Simulation to Predict the Severity of Squeak Sounds

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Mohsen Bayani ◽  
Arian Nasseri ◽  
Vince Heszler ◽  
Casper Wickman ◽  
Rikards Söderberg
Keyword(s):  
Stick Slip ◽  
Friction Parameters

Origin and Characterization of Different Stick−Slip Friction Mechanisms†

Langmuir ◽  
1996 ◽  
Vol 12 (19) ◽  
pp. 4559-4563 ◽  
Author(s):  
Alan D. Berman ◽  
William A. Ducker ◽  
Jacob N. Israelachvili
Keyword(s):  
Friction Mechanisms ◽  
Stick Slip

Influencing Factors on Stick-Slip Behavior of a Ball Screw Driven Elevation Mechanism for MLRS

2012 ◽  
Vol 271-272 ◽  
pp. 958-968
Author(s):  
Young Hyu Choi ◽  
Sung Hyun Jang ◽  
Ji Han Oh
Keyword(s):  
Mathematical Model ◽  
Ball Screw ◽  
Force Model ◽  
Stick Slip ◽  
Single Degree Of Freedom ◽  
Stribeck Effect ◽  
The Stability ◽  
Friction Parameters ◽  
The Mathematical Model ◽  
Rocket System

As an MLRS (Multiple Launch Rocket System) cage is moved with a uniform speed through an elevation mechanism for MRLS operated using ball screws, its stick-slip behavior can be observed by the friction in a ball screw actuator. In this study, a single-degree of freedom mathematical model of an MLRS elevation system is designed and its stick-slip behavior is analyzed using a friction force model considering the Stribeck effect. The stability of a vibration system is analyzed through deriving an equation of normalized motion for the mathematical model and the influences of mechanical parameters and friction parameters on the vibration response and stability are theoretically analyzed.

On the Simulation of Powered Axles Stick-Slip

2015 ◽  
Vol 809-810 ◽  
pp. 610-615
Author(s):  
Cristina Mihaela Tudorache ◽  
Razvan Andrei Oprea ◽  
Cornelia Stan
Keyword(s):  
Steady State ◽  
Frequency Domain ◽  
Time History ◽  
Dynamics Simulation ◽  
Negative Slope ◽  
Axial Vibration ◽  
Stick Slip ◽  
Validation And Verification ◽  
Friction Parameters ◽  
Reduced Scale

The use of high power railway vehicles requires enhanced control of wheel-rail adherence. When setting the train in motion, driving axles can exhibit torsional vibrations resulting in poor adherence and even axle damage. A significant number of railway authorities safety warnings and accident reports were issued related to the above phenomena. Adhesion saturation and negative slope are the characteristics which lead to self-sustained axial vibration. The aim of the present work is to prove the appropriateness of non-smooth models in the study of the axle torsional stick-slip vibrations which may occur when traction vehicles are set into motion. The model is simple, observes the main friction characteristics and provides the basis for efficient dynamics simulation. An experimental setup comprising a reduced scale wheel set is analyzed in order to validate the model proposed. The friction parameters are then identified using the proposed force-creepage relationship. Validation and verification is further carried out in frequency domain using both steady state and transient manoeuvres. Specific phenomena like discontinuities in the time-history friction force values occur. Validation and verification is carried out in frequency domain using both steady state and transient manoeuvres. From the comparison between the numerical and experimental results, it can be concluded that the setup is modeled accurately. Related problems may be solved using the present method, as it is pointed out in the article.

Friction identification using the Karnopp model, applied to an electropneumatic actuator

2003 ◽  
Vol 217 (2) ◽  
pp. 123-138 ◽  
Author(s):  
L Ravanbod-Shirazi ◽  
A Besancon-Voda
Keyword(s):  
Second Step ◽  
Simple Method ◽  
Stick Slip ◽  
The Third ◽  
Friction Identification ◽  
Friction Parameters ◽  
High Degree

In this paper, friction identification is studied. After analysing the Karnopp model behaviour, a simple method based on three steps is presented for identifying its parameters. In the first step, the system mass and slip friction parameters are estimated. In the second step, based on the results obtained in the first step, the stick-slip border parameter (limited velocity) is determined, while in the third step the stiction force is estimated. The method is tested in simulation and in an experimental electropneumatic servo showing its high degree of efficiency.

scholarly journals Repeating caldera collapse events constrain fault friction at the kilometer scale

2021 ◽  
Vol 118 (30) ◽  
pp. e2101469118
Author(s):  
Paul Segall ◽  
Kyle Anderson
Keyword(s):  
Initial Conditions ◽  
Caldera Collapse ◽  
Stick Slip ◽  
Fault Friction ◽  
Rate And State Friction ◽  
Summit Caldera ◽  
Eruption Volume ◽  
Friction Parameters ◽  
Magma System ◽  
Precursory Slip

Fault friction is central to understanding earthquakes, yet laboratory rock mechanics experiments are restricted to, at most, meter scale. Questions thus remain as to the applicability of measured frictional properties to faulting in situ. In particular, the slip-weakening distance dc strongly influences precursory slip during earthquake nucleation, but scales with fault roughness and is challenging to extrapolate to nature. The 2018 eruption of K̄ılauea volcano, Hawaii, caused 62 repeatable collapse events in which the summit caldera dropped several meters, accompanied by MW 4.7 to 5.4 very long period (VLP) earthquakes. Collapses were exceptionally well recorded by global positioning system (GPS) and tilt instruments and represent unique natural kilometer-scale friction experiments. We model a piston collapsing into a magma reservoir. Pressure at the piston base and shear stress on its margin, governed by rate and state friction, balance its weight. Downward motion of the piston compresses the underlying magma, driving flow to the eruption. Monte Carlo estimation of unknowns validates laboratory friction parameters at the kilometer scale, including the magnitude of steady-state velocity weakening. The absence of accelerating precollapse deformation constrains dc to be ≤10 mm, potentially much less. These results support the use of laboratory friction laws and parameters for modeling earthquakes. We identify initial conditions and material and magma-system parameters that lead to episodic caldera collapse, revealing that small differences in eruptive vent elevation can lead to major differences in eruption volume and duration. Most historical basaltic caldera collapses were, at least partly, episodic, implying that the conditions for stick–slip derived here are commonly met in nature.

Friction and the Inverted Pendulum Stabilization Problem

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
Sue Ann Campbell ◽  
Stephanie Crawford ◽  
Kirsten Morris
Keyword(s):  
Small Amplitude ◽  
Viscous Friction ◽  
Experimental System ◽  
Linear Quadratic Regulator ◽  
Poor Performance ◽  
Friction Model ◽  
Linear Quadratic ◽  
Stick Slip ◽  
And Performance ◽  
Friction Parameters

We consider an experimental system consisting of a pendulum, which is free to rotate 360deg, attached to a cart. The cart can move in one dimension. We study the effect of friction on the design and performance of a feedback controller, a linear quadratic regulator, that aims to stabilize the pendulum in the upright position. We show that a controller designed using a simple viscous friction model has poor performance—small amplitude oscillations occur when the controller is implemented. We consider various models for stick slip friction between the cart and the track and measure the friction parameters experimentally. We give strong evidence that stick slip friction is the source of the small amplitude oscillations. A controller designed using a stick slip friction model stabilizes the system, and the small amplitude oscillations are eliminated.

Modeling of a Flexible Instrument to Study its Sliding Behavior Inside a Curved Endoscope

2012 ◽  
Vol 8 (3) ◽  
Author(s):  
Jitendra P. Khatait ◽  
Dannis M. Brouwer ◽  
Ronald G. K. M. Aarts ◽  
Just L. Herder
Keyword(s):  
Static Friction ◽  
Surgical Instrument ◽  
Bending Rigidity ◽  
Stick Slip ◽  
Multibody Modeling ◽  
Beam Elements ◽  
Flexible Instrument ◽  
The Coefficient Of Friction ◽  
Flexible Instruments

Flexible instruments are increasingly used to carry out surgical procedures. The instrument tip is remotely controlled by the surgeon. The flexibility of the instrument and the friction inside the curved endoscope jeopardize the control of the instrument tip. Characterization of the surgical instrument behavior enables the control of the tip motion. A flexible multibody modeling approach was used to study the sliding behavior of the instrument inside a curved endoscope. The surgical instrument was modeled as a series of interconnected planar beam elements. The curved endoscope was modeled as a rigid curved tube. A static friction-based contact model was implemented. The simulations were carried out both for the insertion of the flexible instrument and for fine manipulation. A computer program (SPACAR) was used for the modeling and simulation. The simulation result shows the stick-slip behavior and the motion hysteresis because of the friction. The coefficient of friction has a large influence on the motion hysteresis, whereas the bending rigidity of the instrument has little influence.

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