Open AccessA piecewise negative stiffness mechanism and its application in dynamic vibration absorber
Author(s) -
Hao Yan,
Shen Yongjun,
Wang Junfeng,
Yang Shaopu
Publication year - 2021
Publication title -
international journal of mechanical system dynamics
Language(s) - English
Resource type - Journals
eISSN - 2767-1402
pISSN - 2767-1399
DOI - 10.1002/msd2.12012
Subject(s) - piecewise , vibration , correctness , stiffness , excitation , mechanism (biology) , displacement (psychology) , control theory (sociology) , amplitude , mathematics , harmonic , reduction (mathematics) , mathematical analysis , physics , computer science , algorithm , acoustics , geometry , optics , psychology , control (management) , quantum mechanics , artificial intelligence , psychotherapist , thermodynamics
A new type of piecewise negative stiffness (NS) mechanism is designed and the relationship between the force and displacement is studied. At first, the prototype of the piecewise NS mechanism is established, and the stiffness characteristic of this mechanism is analyzed. Then, the piecewise NS mechanism is applied to dynamic vibration absorber (DVA) system to establish a dynamic model with the piecewise linearity. The differential motion equations are derived according to Newton's law of mechanics. The approximate analytical solution and the amplitude frequency curve of the system with the piecewise NS are obtained by means of the averaging method. The correctness of the analytical solution is proved by comparing with the numerical solution. In the end, the comparisons with two other traditional DVAs show that the system in this paper has better vibration reduction effect under the condition of harmonic excitation and random excitation.