新型可调动力吸振器设计及参数优化

doi:10.7527/S1000-6893.2018.21721

Abstract

Abstract: To effectively suppress the low-frequency or ultra-low-frequency vibration induced by the disturbances in aerospace equipment, a New tunable Dynamic Vibration Absorber (NDVA) with tuning stiffness is proposed in this paper. The implementation of the NDVA is mainly carried out by connecting a Spiral Flexure Spring (SFS) and a Magnetic Negative Stiffness Spring (MNSS). As the proposed NDVA is applied to suppression of resonance, the steady-state frequency response equations and the stability criterion under harmonic force are derived with the averaging method. Based on stability analysis, a new optimization method is offered to attain the optimal parameters with simple iteration. Robustness of the NDVA is analyzed. The results show that besides attenuating vibration in a large low-frequency range, the proposed NDVA can achieve better vibration reduction effect than the linear absorber due to its advantage of robustness in practical application.

Key words: dynamic absorber, negative stiffness, nonlinearity, saddle-node bifurcation, robustness

CLC Number:

V214.3⁺3

LI Qiang, DONG Guangxu, ZHANG Xinong, LUO Yajun, ZHANG Yahong, XIE Shilin. Design and parameter optimization of a new tunable dynamic vibration absorber[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(6): 221721-221721.

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Design and parameter optimization of a new tunable dynamic vibration absorber

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