Results 251 to 260 of about 15,047 (298)
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New type of self-excited oscillator
Review of Scientific Instruments, 1979Using a novel feedback technique an oscillator generates nonresonant LC oscillations whose frequency increases with increasing damping of the circuit. Applications for contactless measurement of the conductivity, permeability, diameter, and thickness of materials, and displacement measurements are discussed.
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Self-Excited Oscillations of Structures by Particle Emission
Nonlinear Dynamics, 2003zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Feng, Z. C. +2 more
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Multi-frequency oscillations in self-excited systems
Nonlinear Dynamics, 2006zbMATH Open Web Interface contents unavailable due to conflicting licenses.
BAKRI T, NABERGOJ, RADOSLAV, TONDL A.
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Self-Excited Oscillations in Combustors With Spray Atomizers
Journal of Engineering for Gas Turbines and Power, 2000Combustors with fuel-spray atomizers are susceptible to a low-frequency oscillation, particularly at idle and sub-idle conditions. For aero-engine combustors, the frequency of this oscillation is typically in the range 50–120 Hz and is commonly called “rumble.” In the current work, computational fluid dynamics (CFD) is used to simulate this self ...
M. Zhu, A. P. Dowling, K. N. C. Bray
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Axi-symmetric, self-excited oscillations in parachutes
4th Aerodynamic Deceleration Systems Conference, 1973The paper derives the conditions under which self-excited, 'breathing' oscillations can exist in parachutes. The 'breathing' phenomenon is shown to be dependent on seven parameters. These parameters include the Froude number, the rigging line length to canopy length ratio, the steady drag coefficient, and the rigging line stiffness number.
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Quadratic Nonlinear Control of a Self-excited Oscillator
Journal of Vibration and Control, 2007The objective of this work is to demonstrate the feasibility of the use of the nonlinear saturation-based control concept to suppress self-excited vibrations by means of active nonlinear feedback control. The authors use the van der Pol oscillator as the working model for a self-excited system. A saturation phenomenon is induced by tuning the frequency
El-Badawy, Ayman A. +1 more
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Self-excited oscillations in a ubitron oscillator with delayed feedback
Journal of Communications Technology and Electronics, 2011The theory of a ubitron oscillator with external delayed feedback is constructed. Starting currents of the oscillator are determined. Microwave generation modes are studied at different currents of the relativistic electron beam.
V. A. Balakirev, A. V. Borodkin
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Periodic Self-Excited Oscillations
1989The majority of the dynamic nonlinear systems in technology and in nature are unconservative. Practically every system involves losses (friction, radiation, heating etc.), and usually the system is not energetically isolated: various external forces and fields act upon it, both static and variable.
M. I. Rabinovich, D. I. Trubetskov
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Control of Multistability in a Self-Excited Memristive Hyperchaotic Oscillator
International Journal of Bifurcation and Chaos, 2019This paper investigates the control of multistability in a self-excited memristive hyperchaotic oscillator using linear augmentation method. Such a method is advantageous in the case of system parameters that are inaccessible. The effectiveness of the applied control scheme is revealed numerically through the nonlinear dynamical tools including ...
Theophile Fonzin Fozin +5 more
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On self-excited oscillations of the Earth
Izvestiya, Physics of the Solid Earth, 2015Recently, Izvestiya, Physics of the Solid Earth has published the empirical results certainly indicating the influence of the free oscillations of the Earth on earthquake activity. It is known that free oscillations are excited by the earthquakes. Therefore, we may hypothesize that the Earth experiences self-excited oscillations.
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