Topic
Dynamic Vibration Absorber
About: Dynamic Vibration Absorber is a research topic. Over the lifetime, 4764 publications have been published within this topic receiving 49429 citations.
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Dissertation•
08 Jun 2005
14 citations
TL;DR: In this article, a finite element analysis based on a moderate deflection beam model is employed to capture the flap, lag, and torsion deflections of the rotor blade.
Abstract: An aeroelastic simulation of a stiff in-plane hingeless rotor in forward flight is conducted to evaluate the feasibility of reducing lagwise root loads via an embedded absorber within the blade. A finite element analysis based on a moderate deflection beam model is employed to capture the flap, lag, and torsion deflections of the rotor blade. The mass-spring-damper absorber system is simulated as a one-degree-of-freedom rigid body with chordwise motion. By using the Hamilton principle, system equations of motion are derived based on the generalized force formulation. Dynamic responses are calculated to investigate the potential of the absorber for in-plane loads reduction. Parametric studies are conducted to explore the influence of the absorber on the dynamic characteristics of the rotor blade. From the aeroelastic analysis of the blade-absorber system, results indicate that placing an embedded absorber in the blade chordwise direction can decrease the 1 and 2/rev lagwise root bending moments by about 50 and 90%, respectively, under large load states. The effects of absorber frequency, absorber damping, chordwise position of the absorber, rotor thrust, forward speed, and trim condition are also studied.
14 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•
19 Sep 2012
TL;DR: In this article, a generating device for recycling energy of a suspended vibration absorber to charge a new-energy-source automobile is presented, which is related to the field of new energy-source automobiles.
Abstract: The invention discloses a generating device for recycling energy of a suspended vibration absorber to charge a new-energy-source automobile, and relates to the field of new-energy-source automobiles. The generating device is mounted in a vibration absorber of an automobile and comprises a ball screw, a generator, a damping piston assembly and a screw guiding shaft sleeve, wherein the ball screw can move up and down along the vibration of the automobile; the damping piston assembly is connected with the lower part of the ball screw and can move up and down along the ball screw; and the screw guiding shaft sleeve is fixed at the bottom in a shell of the vibration absorber and is connected with the bottom of the ball screw. According to the invention, on the basis of not increasing the energy consumption, idle mechanical energy in an automobile driving process is converted into electric energy, so that the new-energy-source automobile can be continuously charged in a driving process at any time, a driving distance of the new-energy-source automobile to a charging station is prolonged, and efficient energy saving is realized; and meanwhile, the invention creates conditions for further popularizing the new-energy-source automobile.
14 citations
Patent•
13 Nov 1980
TL;DR: In this article, the authors propose a dynamic damper mechanism to absorb low frequncy vibration generated on a vehicle, by elastically supporting a part such as a radiator on a front end of a vehicle body so that its inherent vibration frequency becomes a prescribed value.
Abstract: PURPOSE: To efficiently absorb any low frequncy vibration generated on a vehicle, by elastically supporting a such as a radiator on a front end of a vehicle body so that its inherent vibration frequency becomes a prescribed value to have the part actuated as a dynamic damper. CONSTITUTION: A heavy weight part 1 such as a radiator or a battery on a front end of a vehicle body is mounted so that its inherent vibration frequency is kept within the range of 20W30Hz, by means of an elastic body 21, etc. is suppressed by a dynamic damper, so that vibrations of a steering post 8 and a seat 9 can be reduced. COPYRIGHT: (C)1982,JPO&Japio
14 citations