In the low-frequency band below 5 mHz, seismic waves (equivalent to the Earth's free oscillation
in the frequency domain) are more difficult to excite at observable levels because of their longer wavelengths and higher modal mass.
One is free oscillation
resulted by negative damping ratio of power systems.
In this paper, we used Hamiltonian approach for solving differential equation governing the free oscillation
of the mathematical pendulum.
The free oscillation
of the probe is analyzed when it is excited at 320 kHz, a sub-resonant frequency.
By studying the free oscillation
of the building we obtain the free oscillation
amplitude, the stresses induced in the structure, and from the steel properties the maximum deformation the structure can undergo without plastic deformation.
Another measurement taken through a spectrum analyzer confirms that there is no free oscillation
over the frequency band of interest.
Garrett's group improves their efficiency by operating them at resonance or at the tones they produce by the natural free oscillation
of the system.
and Zeman, A.: 2005, Analysis of free oscillation
of the Earth by the record of tidal gravimeter Ascania Gs15.
Resonant oscillations, which occur as soon as the gravitational wave's frequency becomes double the frequency of the particle's free oscillation
(w=2[OMEGA]); in such a case even weak oscillations caused by the gravitational wave may be detected;
of the system without damping is a periodic motion and under the transformation W(t) = V([tau]), Eqs.