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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TL;DR: In this article, the rotational inertia double tuned mass damper (RIDTMD) was used for damping in-plane vibrations of a floating offshore wind turbine (FOWT).
25 citations
TL;DR: In this article, the effect of time delays and control gains on the stability, amplitude, frequency-response behavior, peak amplitude, critical excitation amplitude, and compared the optimal values of the controllers gains, simulated and compared.
Abstract: The paper presents time-delayed feedback control to reduce the nonlinear resonant vibration of a piezoelectric elastic beam.a#13; Specially, we examine three single-input linear time-delayed feedback control methodologies: displacement, velocity anda#13; acceleration time-delayed feedback. Moreover, the multi-input time-delayed feedback control methodologies are discussed. Utilizinga#13; the method of multiple scales, the modulation equation and the first order approximations of the primary resonances are derived and the effect of time delay on the resonances is analyzed. Then the effect of time delays and control gains on the stability, amplitude,a#13; frequency-response behavior, peak amplitude, critical excitation amplitude are investigated. Optimal values of the controllers gainsa#13; and delay are obtained, simulated, and compared. The time-delayed feedback control acts as a vibration absorber at specific values of time delay. On the other hand, using using mixed delay feedback controllers demonstrates an excellent improvement in mitigating the first-mode vibration.
25 citations
TL;DR: In this paper, the rubber member of an automotive vehicle is provided with multistep elasticity characteristics such that a first shearing portion of the rubber part is first deformed in shear, a second shearing part is next deformed under compression, and the other portion thereof is lastly deformed by compression.
Abstract: A vibration absorber for an automotive vehicle which can prevent the shuddering phenomenon even while the vehicle is gradually accelerated or decelerated. The rubber member thereof is provided with multistep elasticity characteristics such that a first shearing portion of the rubber member is first deformed in shear, a second shearing portion thereof is next deformed in shear, and the other portion thereof is lastly deformed under compression. To achieve the above-mentioned elasticity characteristics, some appropriately sized slots, cavities, or gaps are provided within the rubber member at appropriate positions within the rubber member.
25 citations
Patent•
20 Apr 2004
TL;DR: In this article, a dynamic vibration absorber, comprising a weight, a frame body surrounding the weight, and a total of four sets of U-shaped plate springs (4, 5, 6, 7, 8) was installed between the frame body and the weight.
Abstract: A dynamic vibration absorber (1), comprising a weight (2), a frame body (3) surrounding the weight (2), a total of four sets of vertical U-shaped plate springs (4, 5, 6, 7), each set comprising two springs, installed between the frame body (3) and the weight (2) to hold the weight (2) against the frame body (3) movably in all directions in a horizontal plane and unmovably in a vertical direction (V), and a damping mechanism (8) damping the vibration of the weight (2) in a horizontal plane.
25 citations
Patent•
15 Apr 1974
TL;DR: In this paper, the inertia mass moves back and forth in response to vibrations of the vibrating body, alternately compressing the pressurizable fluid within each chamber, and a pressure regulator keeps equal minimum pressures within the chambers.
Abstract: A vibration absorber includes an inertia mass having oppositely directed spaced apart pistons, each being disposed within an independent pressurizable cylindrical chamber which is rigidly attached to a vibrating body. The inertia mass moves back and forth in response to vibrations of the vibrating body, alternately compressing the pressurizable fluid within each chamber. Automatic adjusting means in one embodiment keeps the inertia mass reciprocating substantially evenly about a central point whereby the restoring force on each piston face at the end of each stroke is always about the same. A pressure regulator keeps equal minimum pressures within the chambers. The magnitude of the pressure in conjunction with the mean volume of the pressurized chambers determines the natural period of the reciprocating motion. The pressure can be set so that the device may absorb a wide band of vibrating frequencies of the vibrating body.
25 citations