damping factor


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damping factor

[′dam·piŋ ‚fak·tər]
(physics)
The ratio of the logarithmic decrement of any underdamped harmonic motion to its period. Also known as damping coefficient.
References in periodicals archive ?
Figure 5 shows the variation of the damping factor with power law index.
Based on existing nonparametric estimation algorithms, we propose a two-dimensional spectral estimation algorithm to transform arbitrary real one-dimensional damping vibration signals in the time-domain into a two-dimensional signal in a joint domain of circular frequency and damping factor. The proposed method is expected to provide a high-resolution frequency, high-precision amplitude spectrum, and high-precision damping factor estimations of the vibration signal.
However, for high volume contents of the dispersed phase, the strong decrease in the damping factor (tan[Delta]) shown by such particulate composites is underestimated, i.e., predicted tan[Delta] values of composites are very close to that of displayed by the unfilled polymer.
Damping factor as an important physical parameter can be used to characterize the vibration attenuation capability of the owl feather shaft and compared with other bird's shafts.
The damping factor characterizes the mechanical energy dissipation.
Two major thermal transitions are obvious in storage modulus and damping factor curves, the first one around -50[degrees]C associated to the [T.sub.g] of EOC phase and the other around 150 associated to the [T.sub.g] of COC.
An increase in the damping factor bi leads to a decrease in the amplitude of vibrations and vice versa.
The parameters of the damped vibrations are the eigenangular frequency [[omega].sub.n], the reduced angular frequency p, and the damping factor [xi]:
However, the damping factor for the steel alloys is tiny and varying between 0.001 and 0.008 [32], so that the mechanical energy dissipation of these elements becomes insufficient to reduce the amplitudes of response.
where [s.sub.i] = [[sigma].sub.i] [+ or -] j[[omega].sub.i] is an ith pole including the damping factor [[sigma].sub.i] and natural frequency [[omega].sub.i].
It is seen that the damping factor of the sandwich beam without the field is evaluated as 0.013719 and it is reduced to 0.009219 by applying the magnetic field of 0.2 T.
After the ring-shaped damping layer constrained to outer margin of the stator and the damping factor set-up, the disc complex modal is computed and the complex eigenvalues distribution is obtained in Figure 16.