eigenfrequency

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eigenfrequency

[′ī·gən‚frē·kwən·sē]
(physics)
One of the frequencies at which an oscillatory system can vibrate.
References in periodicals archive ?
The increase in the absolute power of the first eigenfrequency while that of the other eigenfrequencies decreases may be due to damping of the oscillations.
The theoretical value of the eigenfrequency can be obtained using an analytical model based on (8).
A damping factor of 1% has been set for a frequency about 7 Hz, which is close to the first eigenfrequency of the undamaged plate.
Constraints are the first Eigenfrequency, which is required to be above 950 Hz, and a draw constraint to assert manufacturability.
The eigenfrequency for this fourth mode in the Gemona region is evaluated to be about 3.8 Hz and it compares well with one of the dominant frequencies (96) for the spectral response estimated from the Friuli 1976-1977 earthquake sequence at the Tolmezzo-Ambiesta dam (TLM1) accelerograph site.
A typical example of a physical constraint is the relationship between eigenfrequency of a valve plate and rotation speed in a compression chamber:
This range results from the parameters of used seismometers (the eigenfrequency of seismometer Lennartz LE3D/5s is 0.2 Hz) and from the parameters of recording (sampling frequency of the data recorded by the seismometer Guralp CMG-3ESP is 20 Hz).
This model only contains two parameters, the eigenfrequency [[omega].sub.0] = [square root of k+c/m+[m.sub.a]] of buoy/alternator, and the relative damping [zeta] = [gamma]/2 [square root of (m+[m.sub.a])(k+c).
In addition, [[eta].sub.d] = [square root of [[mu].sub.d]/[[epsilon].sub.d] and [[eta].sub.c] = [square root of [[mu].sub.c]/[[epsilon].sub.c] are the intrinsic impedances of the spherical cavity's internal dielectric filler and infinitely thick conducting wall materials, respectively, [mathematical expression not reproducible] and the complex angular resonance frequency (or eigenfrequency) is given by [[??].sub.0] = [[omega]'.sub.0] + j[[omega]".sub.0].
where [[omega].sub.0] = [square root of ([C.sub.Eq] / [J.sub.0])] and [[xi].sub.0]--an angular eigenfrequency of oscillations and a coefficient of the relative damping of the mechanical subsystem, while [[xi].sub.0] = 0.5 [T.sub.E][[omega].sub.0].
They include calculation models for revealing the relation between the eigenfrequency spectrum of anisotropic plates and the piezoelectric effect in the case of different boundary-value problems (Narita 2003).
3D Structural Mechanics Module (eigenfrequency analysis solver) of Comsol Multiphysics package was used to calculate the mode shapes and the undamped natural frequencies.
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