Abstract
In the first part of the research, we present the design of a vibration-based energy harvesting system . Robotic flexible arm having variable cross-section is investigated to overcome serious problems, e.g. insufficient bandwidth and model inaccuracies. Most of the energy harvesting systems are linear with unimodal characteristics. On the other hand, real vibrations can be modeled as random, multi-modal and time varying systems. Hence, unimodal linear systems can give highly unsatisfactory results under certain circumstances. However, non-linear systems can have multi-modal character with increased performance in real and practical situations. In this work, tapered links are preferred with nonlinear coupling setup to provide sufficient bandwidth and output power requirements for modern applications. Thus, the proposed scheme has been proven by simulated and experimental results successfully. In the second part of the research, we present design and experimental results of an electromagnetic harvester, energy source of which is single-phase household AC power with a nominal voltage of 220 V and a frequency of 50 Hz. In this case, energy harvesting is based on the induced electromotive force (EMF) as a result of the periodic variations of the magnetic field around the AC power cord. In this part, we also discuss basic principles of a wireless sensor network design powered by electromagnetically harvested energy obtained from household alternating current.
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Abbreviations
- a 1 :
-
Linear slope for tapering
- b i (x):
-
Variable height of the links due to tapering
- E :
-
Young’s modulus
- I i (x i ):
-
Variable beam cross-section moment about the z-axis at the location x i
- I hi :
-
Inertia of ith hub
- I ti :
-
Tip inertia of ith beam
- l i :
-
Length of ith link
- m hi :
-
Mass of ith hub
- m ti :
-
Tip mass of ith beam
- t :
-
Time (t ≥ 0)
- w i (x i , t):
-
Flexural deflection of point i at the location x i of ith beam
- w ix (x i , t):
-
Flexural slope of point i at the location x i where the subscript in w ix denotes spatial derivative w.r.t. x
- w ixx (x i , t):
-
Bending strain of point i at the location x i
- x i :
-
Coordinate along the axial centre of the ith beam (0 ≤ xi ≤ li)
- θ 1 :
-
Angular position of the first link
- θ 2 :
-
Angular position of the second link
- ρ i (x i ):
-
Variable density of the ith link depends on the cross-sectional area
- τ i :
-
Input torque at ith motor
- FEM:
-
Finite element method
- MEMS:
-
Micro-electro-mechanical systems
- ODE:
-
Ordinary differential equations
- PDE:
-
Partial differential equations
- FFT:
-
Fast Fourier transform
- EMF:
-
Electromotive force
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Doğan, M., İnam, S.Ç., Orkun Sürel, Ö. (2017). Efficient Energy Harvesting Systems for Vibration and Wireless Sensor Applications. In: Bizon, N., Mahdavi Tabatabaei, N., Blaabjerg, F., Kurt, E. (eds) Energy Harvesting and Energy Efficiency. Lecture Notes in Energy, vol 37. Springer, Cham. https://doi.org/10.1007/978-3-319-49875-1_4
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