Abstract
In order to realize low-frequency vibration isolation, a novel geometric anti-spring isolator consisting of several cantilever blade springs are developed in this paper. The optimal design parameters of the geometric anti-spring isolator for different nonlinear geometric parameters are theoretically obtained. The transmissibility characteristic of the geometric anti-spring isolator is investigated through mathematical simulation. A geometric anti-spring isolator with a nonlinear geometric parameter of 0.92 is designed and its vibration isolation performance and nonlinearity characteristic is experimentally studied. The experiment results show that the designed isolator has good low-frequency vibration isolation performance, of which the initial isolation frequency is less than 3.6 Hz when the load weight is 21 kg. The jump phenomena of the response of the isolator under linear frequency sweep excitation are observed, and this result demonstrates that the geometric anti-spring isolator has a complex nonlinearity characteristics with the increment of excitation amplitude. This research work provides a theoretical and experimental basis for the application of the nonlinear geometric anti-spring low-frequency passive vibration isolation technology in engineering practice.
Highlights
For a linear passive vibration isolation system, the vibration isolation performance is effective only when the frequency of external disturbance is more than 2 times the natural frequency
In order to settle this problem, nonlinear vibration isolation systems attract great interests, because they exhibit the typical characteristics of high static stiffness and low dynamic stiffness (HSLDS), which are very different from the invariant stiffness characteristic of linear vibration isolation system [1]
Due to its nonlinear characteristics of high static low dynamic stiffness, the geometric anti-spring structure would be a perfect candidate for the design of low-frequency vibration isolation system
Summary
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, No 443, Huangshan Road, Shushan District, Hefei 230026, China
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