Results 261 to 270 of about 360,412 (305)

Mechanical vibrations of freely standing smectic-A films

International Seminar. Day on Diffraction '2001. Proceedings (IEEE Cat.No.01EX477), 2002
The time-dependent layer displacement-layer displacement correlation functions are analyzed in a free standing thin smectic-A films with the help of the discrete layer model. The film motions are described using the Chebyshev polynomials of second kind, U/sub n/(x).
S.V. Ul'yanov, V.P. Romanov
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Chaotic vibrations of a nonideal electro-mechanical system

International Journal of Solids and Structures, 2001
Abstract Nonideal systems are those in which one takes account of the influence of the oscillatory system on the energy supply with a limited power (Kononenko, 1969) . In this paper, a particular nonideal system is investigated, consisting of a pendulum whose support point is vibrated along a horizontal guide by a two bar linkage driven by a DC ...
Belato, D., Weber, H. I., Balthazar, José Manoel, Mook, D. T.   +3 more
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Forced Vibrations of a Harmonic Lattice in Quantum Mechanics

American Journal of Physics, 1962
Schrödinger's equation is solved in an elementary fashion for a harmonic lattice subject to external forces that are functions explicitly only of time, and to damping forces proportional to velocity expectation values. The result shows that the response is a purely classical motion of the quantum mechanical probability distribution associated with the ...
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Mechanical characteristics of strained vibrating strings and a vibration-induced electric field

Technical Physics, 2012
The mechanical characteristics of vibrating strings strained between rigid supports and a vibration-induced electric field are studied. Experiments are conducted with nylon, rubber, and metallic strings. Vibrations are excited by a pinch at different sites along the string.
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Measurement of Mechanical Vibration of a Dumper

1998
Due to improper assembly and/or manufacture unusual and unpleasant vibrations of all parts of the drivers cabin of the Mercedes-Benz dumper were established. The dumper was of the type 3544-8x6 and was produced in 1995. In order to find the possible source of vibration and to define the comfort factor, the vibration of the drivers seat, the steering ...
Vranković, Nikola, Alfirević, Ivo, Stegić, Milenko   +2 more
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MR Detection of Mechanical Vibrations Using a Radiofrequency Field Gradient

Journal of Magnetic Resonance, 2002
A new method for NMR characterization of mechanical waves, based upon radiofrequency field gradient for motion encoding, is proposed. A binomial B1 gradient excitation scheme was used to visualize the mobile spins undergoing a periodic transverse mechanical excitation.
Nathalie, Baril, Czeslaw Jozef, Lewa, Jacques Donald, de Certaines, Paul, Canioni, Jean-Michel, Franconi, Eric, Thiaudière   +5 more
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Improved monitoring of a spectrum of complex mechanical vibrations

Measurement Techniques, 1996
This article examines new methods of evaluating a spectrum of mechanical vibrations on the basis of smoothing of the spectrum of the signal being analyzed, spectral analysis, and adaptive averaging. A comparative analysis is made of different methods.
Ya. S. Uretskii, Z. A. Bashirov
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Mechanism underlying stability of a vortex-induced vibration

Physics of Fluids
The stability of vortex-induced vibration of a rigid circular cylinder elastically mounted with one degree of freedom in a transverse flow is investigated in the absence of damping. New equations describing the non-stationary behavior of the frequency, amplitude, and phase of cylinder oscillations have been derived, based on the assumption of slowly ...
Galina Dynnikova, Yaroslav Dynnikov, Peter Andronov   +2 more
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Vibration Absorbers for a Class of Self-Excited Mechanical Systems

Journal of Applied Mechanics, 1993
An averaging methodology is employed in studying dynamics of a two-degree-of-freedom nonlinear oscillator. The main system is modeled as a van der Pol oscillator under harmonic forcing. The objective is to reduce its amplitude of oscillation near resonance, by attaching to it a damped vibration absorber with a Duffing spring.
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Excitation of Single-Frequency Vibrations of a Mechanical Resonator

Measurement Techniques, 2000
A new method is proposed for exciting vibrations that makes it possible to create a single-frequency oscillation regime. The article examines the physical and mathematical principles governing excitation conditions and the distribution of single-frequency oscillations in semiconducting sensitive elements of microsensors that measure mechanical ...
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