Rotary bistable and Parametrically Excited Vibration Energy Harvesting

[摘要] Parametric resonance is a type of nonlinear vibration phenomenon [1], [2] induced from the periodic modulation of at least one of the system parameters and has the potential to exhibit interesting higher order nonlinear behaviour [3]. Parametrically excited vibration energy harvesters have been previously shown to enhance both the power amplitude [4] and the frequency bandwidth [5] when compared to the conventional direct resonant approach. However, to practically activate the more profitable regions of parametric resonance, additional design mechanisms [6], [7] are required to overcome a critical initiation threshold amplitude. One route is to establish an autoparametric system where external direct excitation is internally coupled to parametric excitation [8]. For a coupled two degrees of freedom (DoF) oscillatory system, principal autoparametric resonance can be achieved when the natural frequency of the first DoF f1 is twice that of the second DoF f2 and the external excitation is in the vicinity of f1. This paper looks at combining rotary and translatory motion and use autoparametric resonance phenomena.

[发布机构] University of Applied Sciences and Arts Northwestern Switzerland, School of Engineering, Inst. of Automation, Klosterzelgstrasse 2, Windisch; 5210, Switzerland^1;University of Chester, Department of Mechanical Engineering, University of Chester, Thornton Science Park, Pool Lane, Chester; CH2 4PU, United Kingdom^2;Hahn-Schickard, W.-Schickard-Str. 10, Villingen-Schwenningen; 78052, Germany^3;Fritz Huettinger Department of Microelectronics, Germany^4;Lab. for the Design of Microsystems, Department of Microsystems Engineering IMTEK, University of Freiburg, Georges-Köhler-Allee 102, Freiburg; 79110, Germany^5

[效力级别] 能源学

[关键词] Auto-parametric systems;Autoparametric resonance;Frequency band width;Non-linear vibrations;Nonlinear behaviours;Parametric excitations;Parametric resonance;Two degrees of freedom