TY - JOUR
T1 - Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques
AU - Nico, V.
AU - Frizzell, R.
AU - Punch, J.
N1 - Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2017/3/20
Y1 - 2017/3/20
N2 - Conventional vibration energy harvesters are generally based on linear mass-spring oscillator models. Major limitations with common designs are their narrow bandwidths and the increase of resonant frequency as the device is scaled down. To overcome these problems, a two-degree-of-freedom nonlinear velocity-amplified energy harvester has been developed. The device comprises two masses, oscillating one inside the other, between four sets of nonlinear magnetic springs. Impacts between the masses allow momentum transfer from the heavier mass to the lighter, providing velocity amplification. This paper studies the nonlinear effects introduced by the presence of magnetic springs, using high order spectral analysis techniques on experimental and simulated data obtained for a range of excitation levels and magnetic spring configurations, which enabled the effective spring constant to be varied. Standard power spectrum analysis only provide limited information on the response of nonlinear systems. Instead, bispectral analysis is used here to provide deeper insight of the complex dynamics of the nonlinear velocity-amplified energy harvester. The analysis allows identification of period-doubling and couplings between modes that could be used to choose geometrical parameters to enhance the bandwidth of the device.
AB - Conventional vibration energy harvesters are generally based on linear mass-spring oscillator models. Major limitations with common designs are their narrow bandwidths and the increase of resonant frequency as the device is scaled down. To overcome these problems, a two-degree-of-freedom nonlinear velocity-amplified energy harvester has been developed. The device comprises two masses, oscillating one inside the other, between four sets of nonlinear magnetic springs. Impacts between the masses allow momentum transfer from the heavier mass to the lighter, providing velocity amplification. This paper studies the nonlinear effects introduced by the presence of magnetic springs, using high order spectral analysis techniques on experimental and simulated data obtained for a range of excitation levels and magnetic spring configurations, which enabled the effective spring constant to be varied. Standard power spectrum analysis only provide limited information on the response of nonlinear systems. Instead, bispectral analysis is used here to provide deeper insight of the complex dynamics of the nonlinear velocity-amplified energy harvester. The analysis allows identification of period-doubling and couplings between modes that could be used to choose geometrical parameters to enhance the bandwidth of the device.
KW - 2Dof
KW - electromagnetic transducer
KW - energy harvesting
KW - high order spectral analysis
KW - magnetic springs
KW - period doubling
KW - quadratic phase coupling
UR - http://www.scopus.com/inward/record.url?scp=85016152868&partnerID=8YFLogxK
U2 - 10.1088/1361-665X/aa63db
DO - 10.1088/1361-665X/aa63db
M3 - Article
AN - SCOPUS:85016152868
SN - 0964-1726
VL - 26
JO - Smart Materials and Structures
JF - Smart Materials and Structures
IS - 4
M1 - 045029
ER -