Results 241 to 250 of about 118,148 (296)

Self-excited vibrations of a drillstring bit

International Applied Mechanics, 2013
The whirling vibrations of a rotating drillstring bottom-hole assembly subject to the moment of friction are analyzed qualitatively. A problem statement and solution are given. The self-excitation of vibrations is simulated. It is established that during the self-excitation of whirling vibrations, the axial line of the drill bit can slowly and rapidly ...
V. I. Gulyaev, P. Z. Lugovoi, E. I. Borshch   +2 more
openaire   +1 more source

Design and Study on Vibration Characteristics of Self-excited Vibration Layered Subsoiler for Coastal Soil

Journal of Coastal Research, 2020
Ma, X. and Wang, S., 2020. Design and study on vibration characteristics of self-excited vibration layered subsoiler for coastal soil. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S. (eds.), Global Topics and New Trends in Coastal Research: Port, Coastal and
Xing Ma, Shijie Wang
semanticscholar   +1 more source

Quenching of Self-Excited Vibrations

Journal of Vibration and Acoustics, 1989
A passive vibration control system for the quenching of undesirable self-excited vibrations in mechanical systems is presented. The system is a Lanchester damper, attached to the main self-excited system; a van der Pol oscillator. A first-order perturbation solution shows that complete quenching of self-excited vibration is possible.
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Sliding region and coexisting attractors of a friction-induced self-excited vibration.

Chaos, 2020
This paper mainly investigates the nonlinear dynamics of a friction-induced self-excited vibration when the coefficient of static friction is larger than that of kinetic friction. First, this system is rewritten by a new theory proposed by Jeffrey, which
Shihui Fu, Huizhen Ma
semanticscholar   +1 more source

Study on the mechanism for the wheel polygonal wear of high-speed trains in terms of the frictional self-excited vibration theory

Wear, 2019
In the paper, the frictional self-excited vibration of a wheelset-track system caused by the saturated wheel-rail creep force is proposed as a possible mechanism for wheel polygonal wear of high-speed trains.
Xin Zhao, Guangxiong Chen, J. Lv, Shuang Zhang, B. W. Wu, Q. Zhu   +5 more
semanticscholar   +1 more source

Vibration Soil Crushing Mechanism of Self-excited Vibration Subsoiler in Coastal Area

Journal of Coastal Research, 2020
Ma, X.; Wang, S., and Wang, H., 2020. Vibration soil crushing mechanism of self-excited vibration subsoiler in coastal area. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S.
Xing Ma, Shijie Wang, Heying Wang
semanticscholar   +1 more source

Quenching of self-excited vibrations equilibrium aspects

Journal of Sound and Vibration, 1975
Abstract An analysis is presented of two types of self-excited, two-degree-of-freedom systems. The basic subsystem, in each, is governed by a Van der Pol differential equation. This subsystem is considered attached to a vibration absorber or mounted on a resilient foundation.
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Analysis Of Self-excited Longitudinal Vibration Of A Moving Tape

Journal of Sound and Vibration, 1993
Abstract Longitudinal vibration of a moving magnetic tape can be excited by frictional contact with a recording head, or with a guide that defines the path of the tape. The friction force depends on the velocity, relative to a stationary observer, of the tape element that is instantaneously located at the point of contact.
openaire   +1 more source

On the self-excited chatter vibration in motorcycles

2023
This study is focused on the understanding of the nonlinear effects of tyre forces and chain geometry on motorcycle chatter, a self-excited oscillation arising at the rear wheel during heavy braking manoeuvres. In particular the post-bifurcation criticality is assessed, whether subcritical or supercritical, with respect to travelling speed.
Alexander Schramm, Silvio Sorrentino, Alessandro De Felice   +2 more
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Self-excited vibrations of turbomachine blading

Zeitschrift für angewandte Mathematik und Physik ZAMP, 1964
Unter Verwendung einer vereinfachten Betrachtungsweise fur die nicht-stationaren aerodynamischen Krafte wird ein Kriterium fur das Zustandekommen von selbst-erregten Schwingungen bei Axialturbinen- bzw. Axialkompressoren-Schaufeln angegeben, die entlang ihrer Hohe sowohl aerodynamisch wie auch geometrisch veranderliche Eigenschaften aufweisen.
openaire   +2 more sources