On the influence of nonlinearities on vibrational energy transduction under band-limited noise excitations

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Nakano, K.^1 ; Su, D.^2 ; Zheng, R.^2 ; Cartmell, M.^3

Interfaculty Initiative in Information Studies, University of Tokyo, Tokyo

153-8505, Japan^1

Institute of Industrial Science, University of Tokyo, Tokyo

153-8505, Japan^2

Department of Mechanical Engineering, University of Sheffield, Sheffield

S1 3JD, United Kingdom^3

关键词: Band-limited excitations;    Band-limited noise;    Displacement constraint;    Electrical damping;    Excitation levels;    Excitation parameters;    Relative performance;    Vibrational energies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012078/pdf
DOI  :  10.1088/1742-6596/744/1/012078

来源: IOP

【 摘 要 】

Vibrational energy harvesters are often excited by band-limited noise excitations. In this paper, the influence of the stiffness nonlinearity on the transduction of the energy harvester and the relative performance of linear, monostable hardening-type and bistable energy harvesters are compared and investigated. The performance is experimentally compared under band-limited noise excitations of different levels, bandwidths, and centre frequencies at first. The rms output power delivered to the same load resistance is measured and compared under the same excitation levels, which indicts the constant electrical damping level. It is shown that the effect of nonlinearities is strongly dependent on the excitation parameters. Under a moderate excitation level it is shown that the monostable hardening-type oscillator performs worse than its linear counterpart under band-limited excitation. However, the results also illustrate that for the most part of the frequency and bandwidth range considered, the bistable harvester can outperforms the linear variant but for around the peak output area. Moreover, the comparison is also numerically conducted with the consideration of the optimised electrical damping level and the displacement constraint of the device. General conclusions are drawn based on the experimental observations.