Showing papers on "Dynamic Vibration Absorber published in 1972"
219 citations
102 citations
46 citations
TL;DR: In this article, it was shown that neither an undamped nor an infinitely damped vibration absorber can reduce the amplitude of the limit cycle of a Van der Pol oscillator.
31 citations
01 Jul 1972
TL;DR: In this paper, a steady state analysis of the shaft and bearing housing motion was made by assuming synchronous precession of the system, and the conditions under which the support system would act as a dynamic vibration absorber at the rotor critical speed were studied; plots of the rotor and support amplitudes, phase angles, and forces transmitted were evaluated by the computer, and performance curves were automatically plotted by a CalComp plotter unit.
Abstract: A steady state analysis of the shaft and the bearing housing motion was made by assuming synchronous precession of the system. The conditions under which the support system would act as a dynamic vibration absorber at the rotor critical speed were studied; plots of the rotor and support amplitudes, phase angles, and forces transmitted were evaluated by the computer, and the performance curves were automatically plotted by a CalComp plotter unit. Curves are presented on the optimization of the support housing characteristics to attenuate the rotor unbalance response over the entire rotor speed range. The complete transient motion including rotor unbalance was examined by integrating the equations of motion numerically using a modified fourth order Runge-Kutta procedure, and the resulting whirl orbits were plotted by the CalComp plotter unit. The results of the transient analysis are discussed with regards to the design optimization procedure derived from the steady-state analysis.
14 citations
Patent•
06 Jun 1972
TL;DR: In this paper, the film reels are driven by respective electric motor-driven spindles having in the spindle drive a dynamic vibration absorber which resonates at sixty cycles per second to eliminate jittering at slow speed film drive of an image projected on a screen.
Abstract: Reeling apparatus adapted for feeding reeled film between reels, film cartridges, etc. in either direction and uses thereof in image projection devices. The film reels are driven by respective electric motor-driven spindles having in the spindle drive a dynamic vibration absorber which resonates at sixty cycles per second to eliminate jittering at slow speed film drive of an image projected on a screen.
1 citations