Some of the samples were saturated with water under a slight pore pressure, whereas oth ers were airdried. Stickslip phenomenon in measurements of dynamic contact angles and surface viscoelasticity of polystyrenebisoprenebstyrene triblock copolymers. Using the logistic map to generate scratching sounds the. Arising of the stickslip phenomenon is conditioned by the slip movement and autovibrations generation. Generally, stickslip phenomenon is a process of mutual conversion between static and dynamic friction. It is therefore possible to affirm that a 304l ss polished and a uhmwpe sliding face are less. Stickslip occurred in our experiments under a wide range of conditions. 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 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. This is a simple laboratory demonstration of the stickslip phenomenon, so named in. 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. In todays drilling community, stick and slip phenomenon well known as associated with drill bit.
Figure 9a reveals the friction force behavior for the values of fig. Get rid of stickslip trouble with these tips parker. Using the logistic map to generate scratching sounds. Stickslip phenomenon an overview sciencedirect topics. This is when two objects which should slide over each other momentarily stick, resulting in a violent jerking motion. Figure 3 shows the sound for the actual stickslip motion of a bowed string. The mechanism of stickslip phenomenon during friction.
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. Identification and quantification of stickslip induced. On the acoustics of the stickslip phenomenon stefania donescu1, ligia munteanu2, valeria mosnegutu2 abstract. The results also indicate why and when the phenomenon of stickslip effect isobservednot observed. Dynamic spectral analysis has been applied for the first time to the force. Below is a simple, heuristic description of stickslip phenomena using classical mechanics that is relevant for engineering descriptions. Solving the stickslip problem the machine tool groups. In both cases, however, the mechanism for producing sounds is the same, that is, the stickslip phenomenon of a frictional system. In this case, the corresponding mechanism of motion in channel proves to be unstable see section 3. The tests were carried out at a constant forced vibration frequency f 2000 hz, as. Gresham contributing editor people dont often talk about stickslip in every day conversation, even among us.
Further, this study tries to correlate the image data with the force data in order to explain the stickslip phenomenon. Stickslip, also referred to as stiction, is the bane of engineers and machine builders who need smooth, precise motion. During this slip stage, the spring is shortened, which. Simply put, its the jerkiness that can plague both plain and recirculating linear bearings when they transition from standstill to motion. Slip may not necessary occur continuously, it may alternate with adhesion. 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. The relationships between surface structures of these block copolymers and their stickslip phenomena were investigated. Stickslip effects are a frequent phenomenon in everyday life. The focus of this study is to analyze the force data collected from lis setup, especially the dynamic steady state. Gresham contributing editor people dont often talk about stick slip in every day conversation, even among us. 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. Understanding slip perception of soft fingertips by. Stick slip mitigation plan to improve drilling onepetro. How to measure, prevent, and eliminate stickslip and noise.
The stickslip motion is almost periodic for spherical particles over a wide. Department of mechanical engineering, bms college of engineering, bengaluru, india. Effect of tooth displacement and vibration on frictional. 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. The occurrence of stickslip phenomenon article pdf available in journal of theoretical and applied mechanics 451. The friction characteristic is approximated with a piecewise linear function, i. A puzzling phenomenon of icestream flow is the stickslip motion displayed by whillans. Micro stickslip motion systems can provide high resolution motions yet with a long motion range.
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. Study of friction induced stickslip phenomenon in a. Slip stick makes the cello beautiful and the squeaky door annoying. 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. 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. Paper evolution of real contact area during stickslip. During this permanent deformation process, the system experiences large friction forces at mandreltubular. Pdf a selfexcited system with unilateral friction contact modelled by a two degreesoffreedom mechanical system, where the normal force varies. During the stick stage of stickslip motion, the block is fixed and the spring elongation expresses the storage of elastic energy. The interaction frictionvibration gives rise to oscillations within solids which frequently lead to radiation of sound to the surrounding media. In the automotive industry, brake noise is gaining lot of concern and thus has led to extensive research in this field. Such a model can well explain the occurrence of stickslip phenomenon.
Pdf the occurrence of stickslip phenomenon researchgate. Stick slip events in the interior of a car can generate annoying noise. Pdf analytical, computational and experimental studies. 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.
Pdf friction is a complex process involving multiscale asperity contact and large plastic deformation associated with the development of a. Stickslip events in the interior of a car can generate annoying noise. 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. Study of friction induced stickslip phenomenon in a minimal disc brake model. Timeresolved studies of stickslip friction in sheared. So far it seems that there are 2 main parameters witch has the biggest influence. 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. In this paper, the acoustics and friction of the stickslip phenomenon is discussed. Figures 9a and 9b show how repeated velocity variations from zero to about 0. However, the standard deviation values of the friction coefficients. The stickslip action is characterized by the absorption and release of energy as a function of the difference between static and dynamic friction. 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. Tube expansion is a metal forming process attained by propagating a rigid mandrel inside the tubular to permanently enlarge its diameters. This consists of a repetition of a stick stage and a slip stage.
Below is a simple, heuristic description of stick slip phenomena using classical mechanics that is relevant for engineering descriptions. A finite element model describing the dynamics of stickslip phenomenon in downhole tubular expansion was developed. There is a transition from stickslip to a closely smooth motion for the sis films with increasing ps content. Stickslip phenomenon in measurements of dynamic contact. The energy consumed in this process has been identified as a principal source of thermal perturbation in highperformance superconducting magnets, 12 12. We were able to start and stop the phenomenon at will, and to study the onset of the noise, by varying the cooling. By hybridization, it is meant that pe and ss are complementary. Binding ratio stick slip page 1 demystifying the 2. Proceedings of the 29th annual symposium on user interface software and technology touchscreen overlay augmented with the stickslip phenomenon to generate kinetic energy. The normal stress on the sliding surfaces ranged from a few bars to 17 kb. Stickslip vibrations induced by alternate friction models. Hi, any information out there regarding surging or pulsation of conveyors.
A theoretical investigation of frictioninduced selfexcited oscillations for systems with one degree of freedom is proposed. However, it is not a phenomenan that is strictly associated with the drill bit. This phenomenon, which is characteristic of flow of melts and concentrated solutions at high shear stresses, is called the stickslip phenomenon. When stickslip takes place at the end of a long drillstring, the phenomenon will produce accumulation and release of. The phenomenon occurs when static friction and kinetic friction cross swords. The stickslip motion excites vibration resonances within the vane, of a frequency much. To study the stickslip phenomenon and friction behaviour, a test bench has been devised, which consists of a carriage, guide rail, pneumatic cylinder, force transducer and a chain fig. 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 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. Controlling stickslip noise generation with lubricants. When the shear stress between the block and the counterface reaches contact strength, a sudden slip occurs. The experimental setup of the stickslip effect and friction tests.
There is a critical point in this process when slickslip phenomenon disappears, which is called critical speed of the stickslip phenomenon. 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. This phenomenon of oscillating friction between two surfaces is referred to as stickslip. There are three fundamental strategies to control the auto vibrations generated by the stickslip phenomenon. How to measure, prevent, and eliminate stickslip and. 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. Stickslip squeal in a dry scroll vacuum pump john calhoun agilent technologies vacuum products division, lexington. This effect originates from the periodic rupture of junctions created between two rubbing surfaces due to. Stickslip motion occurred at the mean velocity of 0. Experimental investigations on stickslip phenomenon and. Yet another problem with friction is known as the stickslip phenomenon. In the automotive industry, brake noise is gaining lot of.
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