Results 251 to 260 of about 77,548 (281)

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.
openaire   +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.
openaire   +1 more source

Self-Excited Vibration Drilling Models and Experiments

CIRP Annals, 2002
Abstract A nonlinear dynamical model of vibration drilling is presented. It takes in consideration cutting interruption through surface generation equations. The linear stability analysis yields stability charts and the nature of Hopf bifurcation is discussed at critical values of cutting parameters.
S. Tichkiewitch, G. Moraru, D. Brun-Picard, A. Gouskov   +3 more
openaire   +1 more source

Self-excited vibrations due to viscoelastic interactions

Mechanical Systems and Signal Processing, 2020
Self-excited vibrations represent a big concern in engineering, particularly in automotive, railway and aeronautic industry. Many lumped models have been proposed over the years to analyze the stability of such systems. Among the instability mechanisms a falling characteristic of the friction law and mode coupling have been shown to give friction ...
Papangelo A., Putignano C., Hoffmann N.
openaire   +1 more source

Vibration Characteristics of Self-excited Vibration About Sliding Bearings

2020
This paper shows vibration characteristics of a sliding bearings. Especially, we study self-excited vibration (Oil whirl) of the sliding bearings. We tried three analysis methods, which are trajectory of shaft vibration and tracking analysis, and particle number of wear debris in lubricant generated by direct contact between a shaft and outer race of ...
Ryosuke Fukui, Hiromitsu Ohta, Yuta Yamada, Naoya Nagahashi, Tomoo Shigi, Satoshi Tamura   +5 more
openaire   +1 more source

Self-excited vibrations of vertical-lift gates

Journal of Hydraulic Research, 1986
(1986). Self-excited vibrations of vertical-lift gates. Journal of Hydraulic Research: Vol. 24, No. 5, pp. 391-404.
Nguyen D. Thang, Eduard Naudascher
openaire   +1 more source

Self-Excited Vibrations in Metal Cutting

Journal of Engineering for Industry, 1959
The basic mechanisms which cause self-excited vibrations of a cutting tool relative to the work are discussed in a qualitative manner. Similarly, mechanisms inherent in the cutting process which can damp or limit vibrations are discussed. Experiments are presented which are in agreement with the theory.
openaire   +1 more source

Self-Excited Vibrations Induced by Drag Bits

Journal of Energy Resources Technology, 1990
Drillstring vibrations cause premature failure of downhole tools and the drillstring itself. Also, drill bits do not drill efficiently as a result of these vibrations and this inefficiency causes a significant reduction in penetration rate and a corresponding increase in footage cost. Drill bits are a primary source of excitation, but there has been no
D. Dareing, J. Tlusty, C. Zamudio
openaire   +1 more source

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

Self-Excited Vibration of a Hydraulic Turbine

Journal of Engineering for Power, 1967
Severe vibration of a hydraulic turbine was found to be self-excited. Vibration at the natural frequency when operating at synchronous speed produced self-sustaining whirl of the shaft. Gyroscopic action of the turbine runner caused the vibration to be self-excited.
C. C. Crawford, F. O. Ruud
openaire   +1 more source