TY - GEN
T1 - Effects of white noise excitation on tristable piezoelectric energy harvesters with asymmetric potential wells
AU - Ramakrishnan, Subramanian
AU - Ul Shougat, Md Raf E.
AU - Sukumar, Prasanth
PY - 2019/1/8
Y1 - 2019/1/8
N2 - Vibration energy harvesters (VEH) convert the energy of ambient random vibrations to electrical power in applications including autonomous powering of small scale devices. Theoretically, a VEH is represented by a system of two coupled differential equations, one each for the mechanical degree of freedom and the electrical degree of freedom. The interaction between noise and nonlinearity (by design) in a VEH is yet to be fully explored. This is of potential interest in the emerging concept of VEH using nanoelectromechanical systems (NEMS) since stochastic effects assume greater significance in the smaller dynamical scales. Allied with the recent focus on tristable harvesters, we investigate several aspects of the influence of random excitation on harvested power. It is shown that the unique effects of white noise excitation when compared with deterministic excitation include: (1) increase in harvested power by up to 14.28 percent (2) the advantages of asymmetrically designed potentials being achieved at much lower excitation levels and (3) the threshold values for inter-well oscillations being altered in favor of higher harvested power. Together, the results indicate that the advantages of tristable harvesters are enhanced due to white noise excitation; a feature of potential significance in NEMS based harvesters.
AB - Vibration energy harvesters (VEH) convert the energy of ambient random vibrations to electrical power in applications including autonomous powering of small scale devices. Theoretically, a VEH is represented by a system of two coupled differential equations, one each for the mechanical degree of freedom and the electrical degree of freedom. The interaction between noise and nonlinearity (by design) in a VEH is yet to be fully explored. This is of potential interest in the emerging concept of VEH using nanoelectromechanical systems (NEMS) since stochastic effects assume greater significance in the smaller dynamical scales. Allied with the recent focus on tristable harvesters, we investigate several aspects of the influence of random excitation on harvested power. It is shown that the unique effects of white noise excitation when compared with deterministic excitation include: (1) increase in harvested power by up to 14.28 percent (2) the advantages of asymmetrically designed potentials being achieved at much lower excitation levels and (3) the threshold values for inter-well oscillations being altered in favor of higher harvested power. Together, the results indicate that the advantages of tristable harvesters are enhanced due to white noise excitation; a feature of potential significance in NEMS based harvesters.
KW - Energy harvesting
KW - NEMS
KW - White noise
UR - http://www.scopus.com/inward/record.url?scp=85061790144&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061790144&partnerID=8YFLogxK
U2 - 10.1109/NMDC.2018.8605874
DO - 10.1109/NMDC.2018.8605874
M3 - Conference contribution
AN - SCOPUS:85061790144
T3 - 2018 IEEE 13th Nanotechnology Materials and Devices Conference, NMDC 2018
BT - 2018 IEEE 13th Nanotechnology Materials and Devices Conference, NMDC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 13th IEEE Nanotechnology Materials and Devices Conference, NMDC 2018
Y2 - 14 October 2018 through 17 October 2018
ER -