The stick slip phenomenon, also known as the slip stick phenomenon or simply stick slip, is the spontaneous jerking motion that can occur while two objects are sliding over each other. It possesses a challenging impact on analysis of all mechanical systems with friction, since many of them can be modelled by two degreesoffreedom objects awrejcewicz and lamarque, 2003. The stribeck friction, f s, is the negatively sloped characteristics taking place at low velocities see. Morton and hearle24 have presented a simple model to explain the occurrence of stick slip effect. To minimize stickslip when using plain linear bearings, its important to ensure that the bearings are properly spaced, according to the 2. Stickslip definition is movement of two surfaces relative to each other that proceeds by a series of jerks caused by alternate sticking from friction and sliding when the friction is. The mechanical rotational system with stickslip motion example illustrates the use of the rotational friction block in mechanical systems. A lattice solid model capable of simulating rock friction, fracture and the associated seismic wave radiation is developed in order to study the origin of the stick slip instability that is responsible for earthquakes. Heslot, f baumberger, t perrin, b caroli, b caroli, c. We identify, from comparison of the time dependence of the static friction coefficient. The mechanical rotational system with stick slip motion example illustrates the use of the rotational friction block in mechanical systems. The friction element is installed between the load and the velocity source, and there is a difference between.
The velocity at which the stribeck friction is at its peak. Study of friction induced stickslip phenomenon in a. Shop for vinyl, cds and more from dj friction at the discogs marketplace. How to measure, prevent, and eliminate stickslip and. Addressing stickslip friction transition in transient contact problems in many contact problems, it is necessary to address the phenomenon of stickslip friction transition. Stickslip chaos detection in coupled oscillators with friction. When a driving force is applied to one surface, high static friction. Essentially, a nanotip is dragged by a spring over a corrugated energy landscape. Stickslip mitigation option tree highsevere stickslip 1 pdc bit 4 increase mud 2 bha 3 drilling parameters lubricity more bladessmaller cutters increase cutter backrake angle depth of cut limitershybrids use insert bit drop flex collar undergauge stabilizers 18 to 116 integral blade or melonprofile stabilizers drop. The friction element is installed between the load and the velocity source, and there is a difference between the breakaway and the coulomb frictions. This process is continuously repeated while the objects are sliding. Friction in general is an important aspect of modern life.
Pdf simulink model for teaching the stickslip friction. The inertia is driven by a velocity source via a stickslip friction element. Timeresolved studies of stickslip friction in sheared. Dynamic model of an oilwell drillstring with stickslip and bitbounce interaction. How to measure, prevent, and eliminate stickslip and noise. Speed dependence of atomic stickslip friction in optimally matched experiments and molecular dynamics simulations qunyang li,1 yalin dong,2 danny perez,3 ashlie martini,2 and robert w. Study of friction induced stickslip phenomenon in a minimal. This model also shows how to tackle friction dominated contact problem. The movie shows the bahaviour of a tip scanning over a surface in. Study of stickslip friction between steering intermediate.
The coulomb friction, f c, results in a constant force at any velocity. This section presents three alternative models for the friction at the rotary table and the one between the bit and the rock with the form 3. The sum of the coulomb and stribeck frictions at the vicinity of zero velocity is often referred to as the. Using the friction model, the shafts are modeled as a springmassfriction system in simulink for evaluating the effects of the friction parameters and axial. The model considers different stick slip regimes, where the attainable friction force in stiction is determined by the external load and stiction dwell time, as observed in bench testing. Simulink model for teaching the stick slip friction phenomenon in machine vibration and noise course e.
Physik instrumente usa precision motion control 15,830 views 0. Investigation of slip stick process is carried out on a model that includes only the brake disc and the brake pad. Dynamic model of an oilwell drillstring with stickslip and. It shows how the mathworks modeling and simulation tools, simulink and stateflow, tm facilitate the design of automotive control systems. The drop in the friction force at low velocities is the stribeck e. Modelling and analysis of stickslip behaviour in a. Below is a simple, heuristic description of stickslip phenomena using classical mechanics that is relevant for engineering descriptions. Atomistic simulation of stickslip behaviour youtube. This is a benchmark model involving stickslip friction of a ring rolling inside another ring. Below is a simple, heuristic description of stick slip phenomena using classical mechanics that is relevant for engineering descriptions. Modeling a transient contact problem with stickslip friction.
Study of stickslip friction between plunging driveline. An analysis of a onedimensional spring and slider system shows that experimental observations establishing the transition from stable sliding to stickslip to be a function of normal stress, stiffness and surface finish are a consequence of timedependent friction. Thus it is unsurprising that friction has in the past attracted the attention of physicists, and continues to. The transition that occurs when motion is initiated, from higher static friction to lower dynamic friction, can cause a system to overshoot its target position and negatively affect. Using the friction model, the shafts are modeled as a springmass friction system in simulink for evaluating the effects of the friction parameters and axial. Correlation between nanosecond xray flashes and stickslip. Simulation of the frictional stickslip instability. Initially, the surface root mean square rms of the roughness is close to.
In this paper an important problem related to stickslip chaos prediction is successfully solved. Modeling and simulation of the self excited stickslip system using bondsim tools 55 this investigation tends to find out if it is possible to limit the maximal amplitude with external excitation. The viscous friction, f v, opposes motion with the force directly proportional to the relative velocity. Stick slip friction of lightly loaded rock clarence bartow drennon iii iowa state university follow this and additional works at. The comparison of the dynamic friction to the static friction allows for the detection of the occurrence of stickslip in the slip mechanism. The slipstick phenomenon, as described in the above chapter, is a friction induced vibration and occurs mainly due to the nonlinear and velocity dependent friction parameter. The acoustic mechanics of stickslip friction in the. The evolution of frictional strength has great fundamental and practical importance.
A friction contact model is proposed to characterize this type of contact kinematics that imposes both friction nonlinearity and intermittent separation nonlinearity on the system. This model shows a mechanical rotational system with stickslip friction. Speed dependence of atomic stickslip friction in optimally. We examined the microscopic anatomy, kinematics, acoustics and frictional. A lattice solid model capable of simulating rock friction, fracture and the associated seismic wave radiation is developed in order to study the origin of the stickslip instability that is responsible for earthquakes. It has been estimated that a third of the worlds energy resources appear as friction in one form or another, and that between 1% and 6% of the gnp of developed countries is wasted on frictionrelated wear. The frictional properties of a lubricant are critical to i. The friction curve represents cyclic increase and decrease in frictional force, the decrease being almost instantaneous. In this paper an important problem related to stick slip chaos prediction is successfully solved. Modeling and simulation of the self excited stick slip system using bondsim tools 55 this investigation tends to find out if it is possible to limit the maximal amplitude with external excitation. The tomlinson model, also known as the prandtltomlinson model, is one of the most popular models in nanotribology widely used as the basis for many investigations of frictional mechanisms on the atomic scale. As this example illustrates, comsol multiphysics version 5. Investigate stickslip intervals with one equation of motion and analyse the effect of the friction noise ammar a.
Dynamic model of an oilwell drillstring with stickslip. The motion is governed by a static friction force in the stick phase and a velocity dependent kinetic friction force in the slip phase. Stickslip chaos detection in coupled oscillators with. The comparison of the dynamic friction to the static friction allows for the detection of the occurrence of stick slip in the slip mechanism. Simulink model for teaching the stick slip friction. Investigate stick slip intervals with one equation of motion and analyse the effect of the friction noise ammar a. Investigation of slipstick process is carried out on a model that includes only the brake disc and the brake pad.
The stickslip phenomenon, also known as the slipstick phenomenon or simply stickslip, is the spontaneous jerking motion that can occur while two objects are sliding over each other. Stickslip detection and frictionfactor testing with. They reported a sawtoothlike modulation of lateral force in the atomicscale, which is the result of stickslip behavior, that is, a sudden slip after a period of sticking to a certain position of the surface. Applications range from earthquake dynamics 1,2,3,4 to harddrive readwrite cycles 5. Stickslip definition of stickslip by merriamwebster. Jape, sameer, experimental and numerical investigation of effect of stick slip friction transition on lateral vibration of magnetic tapes 2011. Jape, sameer, experimental and numerical investigation of effect of stickslip friction transition on lateral vibration of magnetic tapes 2011. In order to study the effect of surface roughness on the frictional behavior of elastic blocks being rubbed past one. Experimental and numerical investigation of effect of.
Mechanical models of friction that exhibit hysteresis, stick. Simulink model for teaching the stickslip friction. The displacement of the inner ring is computed and compared to the analytical result. Mechanical models of friction that exhibit hysteresis. Stickslip vibrations induced by alternate friction models. In order to study the effect of surface roughness on the frictional behavior of elastic. Stickslip detection and frictionfactor testing with surfacebased torque and tension measurements.
Under vacuum, an additional power of 3 mw must be supplied to overcome the observed stickslip friction. The model considers different stickslip regimes, where the attainable friction force in stiction is determined by the external load and stiction dwell time, as observed in bench testing. Carpick1 1department of mechanical engineering and applied mechanics, university of pennsylvania, philadelphia, pennsylvania 19104, usa 2school of mechanical engineering. Correlation between nanosecond xray flashes and stick. At this point, the sum of the stribeck and coulomb friction is the breakaway friction force. The model consists of a lattice of interacting particles. Using simulink and stateflowtm hacettepe university. The inertia is driven by a velocity source via a stick slip friction element.
Timedependent friction and the mechanics of stickslip. Stick slip definition is movement of two surfaces relative to each other that proceeds by a series of jerks caused by alternate sticking from friction and sliding when the friction is overcome by an applied force. The slip stick phenomenon, as described in the above chapter, is a friction induced vibration and occurs mainly due to the nonlinear and velocity dependent friction parameter. The name tomlinson model is, however, historically incorrect.
Vanishing stickslip friction in fewlayer graphenes. The stickslip friction phenomenon is analyzed by establishing analytical criteria that predict the transition between stick, slip, and separation of the interface. This model shows a mechanical rotational system with stick slip friction. Oct 23, 2008 under vacuum, an additional power of 3 mw must be supplied to overcome the observed stickslip friction. The roughness of the slider surface is measured before and after the experiment using white light interferometry figure 2a colour insets. Motivated mainly by two papers awrejcewicz and holicke. To the unaided eye the motion of sliding objects appears steady. An inertia is connected to a fixed point by spring and damper. For two contact surfaces, stickslip friction can occur whenever the coefficient of kinetic friction is lower than the coefficient of static friction, resulting in some elasticity in the system. Dec 01, 2016 to minimize stickslip when using plain linear bearings, its important to ensure that the bearings are properly spaced, according to the 2. When amplitude of excitation frequency equals zero u00 n, the stationary system is out of equilibrium because of friction force action. The change from stickslip to stable sliding is concomitant with the ageing of the contact interface. Nanotribology studies friction phenomena at the atomistic scale one goal is to find out, if friction can be reduced to zero.
Dynamic model of an oilwell drillstring with stick slip and bitbounce interaction. Morton and hearle24 have presented a simple model to explain the occurrence of stickslip effect. They reported a sawtoothlike modulation of lateral force in the atomicscale, which is the result of stickslip behavior, that is, a sudden slip after a period. Part of thecivil engineering commons this dissertation is brought to you for free and open access by the iowa state university capstones, theses and dissertations at iowa state university. The friction element has a difference between the breakaway and the coulomb frictions, resulting in stickslip motion of the inertia. The friction element has a difference between the breakaway and the coulomb frictions, resulting in stick slip motion of the inertia. Stickslip friction of lightly loaded rock clarence bartow drennon iii iowa state university follow this and additional works at. Timeresolved studies of stickslip friction in sheared granular layers s. In reality this motion is jerky or intermittent because the objects slow during shear periods and accelerate following the shear. May 15, 2007 nanotribology studies friction phenomena at the atomistic scale one goal is to find out, if friction can be reduced to zero. Modeling a transient contact problem with stickslip.
Speed dependence of atomic stick slip friction in optimally matched experiments and molecular dynamics simulations abstract the atomic stick slip behavior of a pt tip sliding on a au111 surface is studied with atomic force microscopy afm experiments and accelerated i. Mechanical rotational system with stickslip motion. May 03, 2017 addressing stickslip friction transition in transient contact problems in many contact problems, it is necessary to address the phenomenon of stickslip friction transition. Slipstick and the evolution of frictional strength nature. Mechanical rotational system with stickslip motion matlab. Experimental and numerical investigation of effect of stick. It is characterized by a linear range with tangent stick slope for small relative displacements stick followed by a horizontal upper bound slip given by, where is the friction coefficient and the local pressure figure 119.
59 838 592 252 418 585 193 834 81 6 730 761 991 572 689 1015 170 1540 466 712 874 271 715 1068 1603 1665 1285 271 167 1005 367 859 527 1282 737 1530 1646 1563 801 614 311 279 325 616 844 199 1101 1093