Results 241 to 250 of about 3,333 (268)

Control of Stick-Slip Vibration in Drillstrings with Multiple Frequencies

2020 American Control Conference (ACC), 2020
Torsional vibration is a common phenomenon, known as stick-slip in oil-well drilling, that causes poor drilling performance, downhole tool failure, and bit wear. It is observed that stick-slip vibration- generally occur at multiple frequencies. To help mitigate torsional vibration, a dynamic model of drillstring is first studied where analytical ...
Zhijie Sun, Sujian Huang
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Oscillation pattern of stick–slip vibrations

International Journal of Non-Linear Mechanics, 2009
Abstract This paper studies the stick–slip oscillations of discrete systems interacting with translating energy source through a non-linear smooth friction curve. The stick–slip limit cycle oscillations of a single degree-of-freedom model are examined by means of numerical time-integration and analytical methods.
Jaeyoung Kang, Charles M. Krousgrill, Farshid Sadeghi   +2 more
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Stick‐slip in the presence of a normal vibration

Tribotest, 2002
AbstractThis paper presents a dynamic analysis of a contact system subjected to an applied normal vibration. The tangential motion of the system is found to exhibit stick‐slip behaviour dependent on the applied vibration, even in the absence of a difference in static and kinetic friction or a negative gradient in the friction‐velocity relation.
M. Krallis, D. P. Hess
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Complimentarity Problems of Stick-Slip Vibrations

14th Biennial Conference on Mechanical Vibration and Noise: Dynamics and Vibration of Time-Varying Systems and Structures, 1993
Abstract Multibody systems with many friction contacts not being decoupled by some force laws afford a special treatment with respect to the uniqueness of the solution after a contact event. This problem can be solved by an optimization techniques including unequality constraints which corresponds exactly to the physical properties of ...
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Random Vibration of a Beam with a Stick-slip End Condition

Journal of Sound and Vibration, 1994
Abstract An analysis is presented of the response of a randomly excited beam with an axial stick-slip end condition. The emphasis of the present effort is on the case in which slipping is a relatively rare event so that, while it does not contribute significantly to the system damping, it does have a marked influence on the non-linear behaviour.
Miles, R. N., Bigelow, S. P.
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Control of Stick-Slip Vibrations

2006
Many technical applications are subjected to friction induced vibrations. These vibrations are mostly unwanted as they generate noise, increase wear and diminish accuracy. In this paper a feedback control is introduced that is capable to suppress these oscillations. The results are validated experimentally on a squealing brake.
Marcus Neubauer, Cord-Christian Neuber, Karl Popp   +2 more
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Experimental Validation of Object Positioning Via Stick–Slip Vibrations

IEEE/ASME Transactions on Mechatronics, 2014
Accurate positioning of an object is important in many industrial applications. This task is usually performed using closed-loop control. Self-alignment of an object using stick-slip vibrations on a periodically excited table might be an alternative open-loop method for macro-scale applications.
van Hoof, J.A.J.M., Verhaegh, J.L.C., Fey, R.H.B., Meerakker, van de, P.C.F., Nijmeijer, H.   +4 more
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Stick-Slip Vibration

2010
It is known that nonlinearities in the friction-velocity curves of dry friction may lead to instability of the steady frictional sliding, namely, friction-induced vibration. The Froude pendulum and the motion of a violin string under the action of a bow are frequently used as examples of friction-induced vibration.
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Archwire vibration and stick-slip behavior at the bracket-archwire interface

American Journal of Orthodontics and Dentofacial Orthopedics, 2012
It is unknown whether or not intraoral vibrations affect stick-slip behavior at orthodontic bracket-archwire interfaces. In this study, we evaluated bracket-archwire stick-slip behavior as a function of ligation method and archwire vibration.In-vivo archwire vibrations were measured to obtain frequencies and amplitudes for ex-vivo testing.
Julie E, Olson, Ying, Liu, Jeffrey C, Nickel, Mary P, Walker, Laura R, Iwasaki   +4 more
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Dynamics of a Simple Damped Oscillator Undergoing Stick-Slip Vibrations

Meccanica, 1999
The authors study the dynamic behaviour of a simple oscillator consisting of a mass subjected to an elastic restoring force, and to viscous damping and dry friction forces arising from the contact with a moving belt. It is shown that the discontinuity of the governing equations induces non-standard bifurcations in the solutions paths of the system. The
GALVANETTO, UGO, BISHOP SR
openaire   +2 more sources