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The reason is that the direct drive valve (DDV) (a device in governor) of a small power unit in 110 kV power grid is not stable at certain load level, thus it excites the load fluctuation of the small unit and finally leads to the forced oscillation around 1 Hz in many power units nearby, including the Qinshan nuclear unit.
Our results show that the first transverse forward and backward modes could be excited if the longitudinal excitation load is larger than the critical load, even though there is no excitation in the transverse direction.
It is worth noting that the vibration suppression is enhanced with increasing the damping of NES when the system is excited by harmonic loads and with decreasing the damping when the system is excited by impulse loads.
Equations of a dynamic system excited by arbitrary loads result in partial differential equations.
These relations are applied to a panel with one or more attached masses that is excited by impulsive loads.
The present work is focused on the analysis of the effectiveness of dynamic vibration absorbers applied to beams excited by moving loads.
A general analytical formulation is used to compute the response of three-dimensional invariant or periodic media that are excited by moving loads.
As examples, the displacement responses of FGM shells excited by point loads are calculated, and the characteristics of waves in FGM shells are discussed.
The wind loads which include buffeting loads and self-excited loads are converted into the time domain by using a computer simulation technique to form aerodynamic damping and stiffness matrices as well as element loading vectors.
The vortex-induced vibration equation of a casing pipe was set up with considering the beam mode and Morison's nonlinear fluid loads as well as the vortex-excited loads.
I followed it through several stops and starts as it loaded excited children.
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