摘要
Limited by the mass,stiffness,barrier height and natural frequency of the oscillator,the existing structure or mechanism is still difficult to achieve vibration suppression and effective utilization under ultra-low frequency excitation.In particular,it is difficult to break through the technical bottleneck of the integration and intelligence of vibration isolation and energy harvesting(VIEH).The introduction of nonlinearity is usually used to solve the problem of ultra-low frequency,and the integration problem can be overcome through electromechanical coupling.Therefore,the purpose of this article is to reveal and deeply explore the geometric nonlinearity and electromechanical coupling of multistage oscillators for ultra-low frequency VIEH.This kind of multifunctional oscillators can be realized by combining mechanical multistage coupling and electromechanical conversion technologies.The experimental results confirm the development of multistage theory,and the results show that,especially in the case of multicoupling structures,the multistage oscillators with high-order quasi-zero stiffness can effectively reduce the initial frequencies of vibration isolation and the frequencies corresponding to the maximum output power.The theoretical and experimental results in this paper show that the multistage oscillators are suitable for VIEH of ultra-low frequency sources.
基金
supported by the National Natural Science Foundation of China(Grant Nos.12002272,11802237 and 12072267)
the Fundamental Research Funds for the Central Universities(Grant No.G2020KY05309)
the China Postdoctoral Science Foundation(Grant No.2021M692642)
the 111 Project(Grant No.BP0719007)。
