1. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Generic model of vibration energy harvesters

2. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Clamped-guided beam

3. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Nonlinear effects in clamped-guided beams

4. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Boundary conditions for FEA

5. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Successive derivatives of FK(x) with respect to x: (a) FK, (b) F′K (c) F″K, (d) F‴K

6. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
H-shaped spring design

7. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
(a) Model of the new spring and equivalent behavior in (b) linear domain and (c) nonlinear domain

8. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Finite element analyses results. Deformation and Von Mises stresses σ in Pa for various x and for (L, b, e, l1, l2, a) = (3 mm, 1 mm, 100 μm, 100 μm, 100 μm, 1 mm) (a) x = 50 μm, (b) x = 100 μm, (c) x = 250 μm, and (d) x = 500 μm.

9. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Relative position (x) as a function of time (t) for nondamped oscillators

10. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Variation of the normalized natural frequency feq/f0 of the energy harvester as a function of the normalized displacement amplitude xmax/e (f0 = 100 Hz, e = 100 μm)

11. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Simulink model of VEH (a) linear and (b) nonlinear

12. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
(a) Relative displacement and (b) output power of a nonlinear energy harvester as a function of α (A = 1 m s−2) for e = 100 μm

13. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Output powers of (a) a linear energy harvester and (b) a nonlinear energy harvester as a function of A (α = 1)

14. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
Vibrations on a “car engine at 3000 rpm”: (a) temporal, (b) zoom between 8 s and 8.02 s, and (c) spectrum

15. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
(a) Relative displacement and (b) zoom; (c) output power of the linear energy harvester for m = 1 g and (d) zoom

16. Date of download: 10/5/2017
Copyright © ASME. All rights reserved.
From: Nonlinear H-Shaped Springs to Improve Efficiency of Vibration Energy Harvesters
J. Appl. Mech. 2013;80(6): doi: /
Figure Legend:
(a) Relative displacement and (b) zoom; (c) output power of the nonlinear energy harvester for m = 1 g and (d) zoom