Coherent tribodynamics

Zaspa, Yu. P.

doi:10.3103/s1068366612060128

Cited by 2 publications

(9 citation statements)

References 13 publications

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“…The latter causes high dynamic friction at small angles α since the low frequency mode is above resonance with regard to condition of autowave resonance (1). When the parameter l m is relatively close to one of the characteristic quasistatic scales [14] (in this case, to the diameter of the contact area (for glass, d ≈ 40 μm in the quasistatic case)), the strongest autoresonance could be expected. At small angles α ~ 1°( υ ~ 0.3 m/s), modes with the frequency ~ 7 kHz turn out to be in the most favorable position for reso nance, such that the modes of the plate turn out to be substantially above resonance in the context of the velocity, which leads to their "tendency" for hamper ing motion.…”

Section: Spectral Analysis Of Acoustic Emission Generatedmentioning

confidence: 98%

“…This makes it possible to precisely consider the auto wave resonance conditions in movable contacts as fol lows [13][14]:…”

Section: Structural Model Of Autowave Frictionmentioning

confidence: 99%

“…2 are due to autowave resonance at frequencies of the modes of contact oscillations of the ball. However, negative friction at high angles α is caused by a third force, i.e., the ultrasonic mode of natural oscillations of the ball [14] that is substantially below resonance and affects the acceleration of the body. Nevertheless, this mode is not recorded by the acoustic instrumentation used.…”

Section: Spectral Analysis Of Acoustic Emission Generatedmentioning

confidence: 99%

“…The final spectral width of this mode is the factor that governs the internal competition of the coherent wave packet (Δν/ν ~ 10 -6 ). The frequency width of this packet Δν~0.1 Hz is inversely proportional to the period of self modulation instability or the time of coherency [14] (Fig. 7a).…”

Section: Self Modulation Instabilitymentioning

confidence: 99%

“…The friction modes under consideration have motion velocity and motion energy thresholds that are similar to the Reynolds transition from laminar to tur bulent internal friction. In [13,14], these modes are treated as autowave modes.…”

Section: Introductionmentioning

confidence: 99%

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Competition of modes and self-modulation instability in dynamics of coherent friction: A review

Zaspa

2013

J. Frict. Wear

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A structural pattern of the autowave transfer of the pulse and energy in dry and boundary friction systems is proposed. The coherence of friction is provided by a nonlinear excitation wave field with a nucleus-shell structure. A matching nucleus is concentrated in the friction contact and the physical volume of the friction counterbodies plays a role of a feedback resonator. The envelope velocity of a wave packet is a key parameter of the matching of movement in the autowave mode. Physical mechanisms and specific exam ples of the competition of modes in dynamic tribosystems that lead to the self modulation instability of these modes are considered. A comparative analysis of the coherent transfer of the pulse and energy in external and internal friction systems is carried out to describe nonstationary modes and turbulence.

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Section: Spectral Analysis Of Acoustic Emission Generatedmentioning

confidence: 98%

“…This makes it possible to precisely consider the auto wave resonance conditions in movable contacts as fol lows [13][14]:…”

Section: Structural Model Of Autowave Frictionmentioning

confidence: 99%

Section: Spectral Analysis Of Acoustic Emission Generatedmentioning

confidence: 99%

Section: Self Modulation Instabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Competition of modes and self-modulation instability in dynamics of coherent friction: A review

Zaspa

2013

J. Frict. Wear

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Exchange interaction and models of contact generation of disturbances in tribosystems

Zaspa

Dykha

Marchenko

et al. 2020

EEJET

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The physical mechanisms have been investigated that form and transform the corpuscular-vortex-wave thermal complexes of disturbances in contact tribosystems based on the quantum-mechanical exchange interaction. The presence of a contact gap determines the generation of pairs of quasi-particles-disturbances stabilized by wavelength and frequency. Internal instability and collapse processes in such a system of disturbances lead to the formation of defects in a tribopair's material and underlie the emergency friction regimes. This paper gives specific technical examples of the generation of thermal complexes at fretting, during the friction of sliding and rolling, and at cutting. It has been established that the destructive nature of the process of fretting at low values of reverse sliding speeds is caused by the generation and collapse of the corpuscular-vortex-wave thermal complexes. An example of acoustic friction emission in the ultrasonic region of the spectrum has been used to show the quantum nature of the disturbances generated by friction. The high-frequency spectrum of acoustic emission corresponds to the unbalanced composition of the disturbances and leads to the formation of wear particles. The exchange interaction in a tribosystem involving rolling on the plane has been considered. The results of statistical analysis of such rolling showed the existence of the effect of negative friction caused by the quantum generation of longwave disturbances. It has been demonstrated that the collapsed component of the generation of disturbances is significantly increased under the modes of materials destruction, including when cutting the materials. The corpuscular-vortex-wave mechanism of selective transfer and hydrogen wear in tribosystems has been described. It is shown that the properties of a servovite film under the mode of selective transfer are provided by the collapse processes in the system of disturbances. Similar processes at the vortex-wave transfer of hydrogen atoms in metals lead to the wear and destruction of the surface layer of friction

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Coherent tribodynamics

Cited by 2 publications

References 13 publications

Competition of modes and self-modulation instability in dynamics of coherent friction: A review

Competition of modes and self-modulation instability in dynamics of coherent friction: A review

Exchange interaction and models of contact generation of disturbances in tribosystems

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