Gresham contributing editor people dont often talk about stick slip in every day conversation, even among us. This phenomenon, which is characteristic of flow of melts and concentrated solutions at high shear stresses, is called the stickslip phenomenon. Experimental investigations on stickslip phenomenon and. The interaction frictionvibration gives rise to oscillations within solids which frequently lead to radiation of sound to the surrounding media. 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. Stick slip events in the interior of a car can generate annoying noise.
The tests were carried out at a constant forced vibration frequency f 2000 hz, as. When stickslip takes place at the end of a long drillstring, the phenomenon will produce accumulation and release of. Tube expansion is a metal forming process attained by propagating a rigid mandrel inside the tubular to permanently enlarge its diameters. Stickslip motion occurred at the mean velocity of 0. Figure 9a reveals the friction force behavior for the values of fig. However, it is not a phenomenan that is strictly associated with the drill bit. Stickslip occurred in our experiments under a wide range of conditions.
Stick slip effects are a frequent phenomenon in everyday life. During the stick stage of stickslip motion, the block is fixed and the spring elongation expresses the storage of elastic energy. So far it seems that there are 2 main parameters witch has the biggest influence. In the area of seals and cylinders, stickslip is characterized by a distinct stopstart movement of the cylinder, and may be so rapid that it resembles severe. Further, this study tries to correlate the image data with the force data in order to explain the stickslip phenomenon. Stickslip events in the interior of a car can generate annoying noise.
This phenomenon of oscillating friction between two surfaces is referred to as stickslip. How to measure, prevent, and eliminate stickslip and noise. The stickslip motion excites vibration resonances within the vane, of a frequency much. Understanding slip perception of soft fingertips by. Some of the samples were saturated with water under a slight pore pressure, whereas oth ers were airdried. The motion is governed by a static friction force in the stick phase and a velocity dependent kinetic friction force in the slip phase. The mechanism of stickslip phenomenon during friction. Most studies have reported a quickly slip duration, as a ratio of about found in a study of the stickslip phenomenon by scratching lif single crystals with a diamond indenter 17.
There are three fundamental strategies to control the auto vibrations generated by the stickslip phenomenon. There is a transition from stickslip to a closely smooth motion for the sis films with increasing ps content. In the automotive industry, brake noise is gaining lot of concern and thus has led to extensive research in this field. The stickslip is a nonlinear frictional phenomenon with alternative sticking and slipping movements, which exhibits widely in nature and daily life, such as the instability of continental plates, the squeal of brakes, and the crawling of machine tools. The stickslip motion is almost periodic for spherical particles over a wide. The existence of friction could cause a steadystate error, a limit cycle, or stick slip phenomenon at low speed in the motion control systems. The effect of laser surface texturing to inhibit stick. On the acoustics of the stickslip phenomenon stefania donescu1, ligia munteanu2, valeria mosnegutu2 abstract. Get rid of stickslip trouble with these tips parker. Pdf analytical, computational and experimental studies. The experimental setup of the stickslip effect and friction tests. Proceedings of the 29th annual symposium on user interface software and technology touchscreen overlay augmented with the stickslip phenomenon to generate kinetic energy. The occurrence of stickslip phenomenon article pdf available in journal of theoretical and applied mechanics 451.
Pdf a selfexcited system with unilateral friction contact modelled by a two degreesoffreedom mechanical system, where the normal force varies. The phenomenon occurs when static friction and kinetic friction cross swords. The friction characteristic is approximated with a piecewise linear function, i. Hi, any information out there regarding surging or pulsation of conveyors. Slipstick makes the cello beautiful and the squeaky door annoying. Slip phenomenon are the surface finish of the sliding face and the choice of the wear components material. Solving the stickslip problem the machine tool groups. Simply put, its the jerkiness that can plague both plain and recirculating linear bearings when they transition from standstill to motion. This is a simple laboratory demonstration of the stickslip phenomenon, so named in. Study of friction induced stickslip phenomenon in a. When the shear stress between the block and the counterface reaches contact strength, a sudden slip occurs.
However, the standard deviation values of the friction coefficients. The piezoelectric stickslip actuator pessa, which is a hybridization of the piezoelectric actuator pea and the stick slip actuator ssa, is a typical example in these systems. Stick slip mitigation plan to improve drilling onepetro. In order to better suppress the stickslip phenomenon of the machine guide rail, this article simulates the initial working condition of the machine guide rail on the friction test machine and explores the influence of different texture surface morphologies on the stickslip phenomenon of the friction surface of the guide rail. The relationships between surface structures of these block copolymers and their stickslip phenomena were investigated. Stickslip effects are a frequent phenomenon in everyday life. Pdf the occurrence of stickslip phenomenon researchgate.
The friction force is assumed as an odd function of the relative sliding velocity with a jump discontinuity at a value of zero for the relative sliding velocity. The condition and tortuosity of the wellbore, the type of formations being drilled and the lubricity of the drilling have a significant influence on stick and slip as well. Yujin seo, bumsoon lim, young guk park, ilhyung yang, seokjoon ahn, taewoo kim, seunghak baek, effect of tooth displacement and vibration on frictional force and stickslip phenomenon in conventional brackets. Binding ratio stick slip page 1 demystifying the 2. The energy consumed in this process has been identified as a principal source of thermal perturbation in highperformance superconducting magnets, 12 12. In both cases, however, the mechanism for producing sounds is the same, that is, the stickslip phenomenon of a frictional system. A puzzling phenomenon of icestream flow is the stickslip motion displayed by whillans.
Stickslip vibrations induced by alternate friction models. Study of friction induced stickslip phenomenon in a minimal disc brake model. Figure 3 shows the sound for the actual stickslip motion of a bowed string. Figures 9a and 9b show how repeated velocity variations from zero to about 0. The article presents a scheme and description of the test stand as well as selected experimental results of the influence of longitudinal tangential vibrations on the stickslip phenomenon. A finite element model describing the dynamics of stickslip phenomenon in downhole tubular expansion was developed. Timeresolved studies of stickslip friction in sheared. Using the logistic map to generate scratching sounds. How to measure, prevent, and eliminate stickslip and.
The normal stress on the sliding surfaces ranged from a few bars to 17 kb. Gresham contributing editor people dont often talk about stickslip in every day conversation, even among us. Since brake groan is induced by the stickslip phenomenon, the equations of motion are given by the following equations where friction torque introduces a piecewise nonlinearity. This effect originates from the periodic rupture of junctions created between two rubbing surfaces due to. Pdf friction is a complex process involving multiscale asperity contact and large plastic deformation associated with the development of a. Department of mechanical engineering, bms college of engineering, bengaluru, india. Generally, stickslip phenomenon is a process of mutual conversion between static and dynamic friction. The results also indicate why and when the phenomenon of stickslip effect isobservednot observed.
This consists of a repetition of a stick stage and a slip stage. The stickslip 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. Below is a simple, heuristic description of stickslip phenomena using classical mechanics that is relevant for engineering descriptions. In this paper, the acoustics and friction of the stickslip phenomenon is discussed. Below is a simple, heuristic description of stick slip phenomena using classical mechanics that is relevant for engineering descriptions. In this case, the corresponding mechanism of motion in channel proves to be unstable see section 3.
The stickslip action is characterized by the absorption and release of energy as a function of the difference between static and dynamic friction. Effect of tooth displacement and vibration on frictional. It is therefore possible to affirm that a 304l ss polished and a uhmwpe sliding face are less. During this permanent deformation process, the system experiences large friction forces at mandreltubular. Most studies have reported a quickly slip duration, as a ratio of about found in a study of the stick slip phenomenon by scratching lif single crystals with a diamond indenter 17. Stickslip, also referred to as stiction, is the bane of engineers and machine builders who need smooth, precise motion. Arising of the stickslip phenomenon is conditioned by the slip movement and autovibrations generation.
Such a model can well explain the occurrence of stickslip phenomenon. Experimental investigations of elimination the stickslip. When this happens to two parts of an industrial machine, it can result in inaccurate operation or even significant damage to the machine. In the automotive industry, brake noise is gaining lot of. A theoretical investigation of frictioninduced selfexcited oscillations for systems with one degree of freedom is proposed. Micro stickslip motion systems can provide high resolution motions yet with a long motion range.
Stickslip phenomenon in measurements of dynamic contact. Slip may not necessary occur continuously, it may alternate with adhesion. We were able to start and stop the phenomenon at will, and to study the onset of the noise, by varying the cooling. Controlling stickslip noise generation with lubricants.
Dynamic spectral analysis has been applied for the first time to the force. Stickslip squeal in a dry scroll vacuum pump john calhoun agilent technologies vacuum products division, lexington. During this slip stage, the spring is shortened, which. In todays drilling community, stick and slip phenomenon well known as associated with drill bit. Stickslip phenomenon in measurements of dynamic contact angles and surface viscoelasticity of polystyrenebisoprenebstyrene triblock copolymers. Identification and quantification of stickslip induced. There is a critical point in this process when slickslip phenomenon disappears, which is called critical speed of the stickslip phenomenon.
Using the logistic map to generate scratching sounds the. Paper evolution of real contact area during stickslip. Yet another problem with friction is known as the stickslip phenomenon. Stickslip phenomenon an overview sciencedirect topics.
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