Abstract
This paper presents a new dynamic absorber attenuating the vibrations at three resonance frequencies simultaneously. The dynamic vibration responses of mechanical systems with dynamic absorbers are mainly influenced by how close the eigenfrequencies of the installed dynamic absorbers are to the eigenfrequencies of the hosting structure. To suppress structural vibration at single target frequency, it is enough to install a single mass tuned dynamic absorber whose eigenfrequency is tuned to the excitation frequency. To suppress structural vibrations at multiple frequencies, multiple dynamic absorbers whose eigenfrequencies are tuned differently can be installed. Inevitably this approach increases the total weight of the dynamic absorbers and the manufacturing cost. To overcome the limitation and to attenuate vibrations over a wide range of frequencies, a new dynamic absorber without a damper tuned for multiple frequencies was presented in this research. The present dynamic absorber consists of a mass and two arm-beams connected to a hosting structure. By changing the geometric dimensions, it is possible to precisely tune the eigenfrequencies of the dynamic absorbers to those of hosting structure. The present study also adopts an optimization process to tune the geometric parameters based on the numerical optimization algorithm. With several numerical examples and an experiment, the validity of the present dynamic absorber is presented.
Highlights
Exploiting the availability of efficient dynamic absorber, finite element (FE) procedure, and structural optimization, this research develops a new dynamic absorber for multiple frequencies while reducing the mass of the dynamic absorber
Dynamic absorber with mass-spring system illustrated in Figure 1 has been widely used to mitigate structural vibration in mechanical and civil structures for the effectiveness and the easy installation
This example shows that the present dynamic absorber and the optimization algorithm can be useful in reducing the vibration
Summary
Exploiting the availability of efficient dynamic absorber, finite element (FE) procedure, and structural optimization, this research develops a new dynamic absorber for multiple frequencies while reducing the mass of the dynamic absorber. An active vibration absorber is recommended for variable frequency operation conditions To overcome this shortcoming, this research presents a new type of passive dynamic absorber attenuating two bending modes and one torsional mode. This research presents a new type of passive dynamic absorber attenuating two bending modes and one torsional mode This dynamic absorber consists of two beams connected a hosting structure. As the characteristic length of the dynamic absorber is about 10 cm, it may be difficult to find out very different size dynamic absorbers To overcome this difficulty, this research suggests to apply the structural optimization scheme optimizing the geometric dimensions to minimize the proof mass subject to the frequency constraints.
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