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Similar to combustion engines comprising multiple cylinders engaged with a crankshaft, multiple piezoelectric stack actuators (PSA) engaged with a common output rod can produce smooth, long stroke motion with desired properties. In particular, when equally spaced multiple units are arranged to push sinusoidal gear teeth on the output rod, the system exhibits unique collective behaviors thanks to “harmonic”...
Vibration isolation systems with nonlinear stiffness under sinusoidal excitation exhibit unwanted jump phenomena and superharmonics when they are lightly damped. These characteristics can be suppressed by linear viscous damping but the force transmissibility over the high frequency range increases as a result. In this study, nonlinear viscous damping will be chosen to solve this problem with the aid...
In this paper, the unbalanced magnetic pull and eccentric mass force which caused vibration of the rotor are introduced. The virtual displacement method is employed to solve the two kinds of force. The inherent characteristics of rotor are analyzed through finite element method and experiment. The dynamic response and axis locus of rotor under the action of unbalanced magnetic pull and eccentric mass...
In this paper, the unbalanced magnetic forces which act upon the rotor of a salient-pole synchronous generator due to eccentric motion of the rotor shaft in the presence of magnetic field in no-load and loaded condition are calculated using the finite-element method. The displacement of the rotor is modeled using the actual shaft orbit measured on a 5-MVA salient-pole generator driven by a gas turbine...
Bouncing is a typical activity of human body and it can generate dynamic loading which should be considered in various occasions. Three different bouncing load models in literature are compared in this paper, including the theories developed by E. Duarte and T. Ji in 2009, J. G. Parkhouse and D. J. Ewins in 2006, J. W. Dougill et al. in 2006. Base on the coefficients given in literature, the comparison...
This paper deals with the resonance control of a test rig for vibrations in overhead transmission lines and corresponding nonlinear dampers (STOCKBRIDGE dampers). In the test rig, an electrodynamical shaker is used as an actuator and the input power is measured. Operating the rig requires the excitation of the mechanical system in resonance. A control law adjusting the frequency and amplitude of the...
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