but first€¦ · conclusion 21 ! nonlinear mechanics introduces new possible directions for energy...
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But First …
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Frontiers in Energy Research Nonlinear Mechanics & Granular Media
Joseph Lydon
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Frontiers In Energy Research
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1. Introduce Nonlinear Mechanics
2. Discuss Two Areas of Energy Research
3. How Granular Crystals fit in with the Frontiers in Energy Research?
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Linear Systems
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} “Simple Harmonic Motion” } 𝑈= 1/2 𝑘𝑥↑2 & 𝐹=−𝑘𝑥
Advantages
• Math Friendly • Low Amplitude • Predictable
Disadvantages
• Quality Factor/Bandwidth Tradeoff
• Harmonic
U(x)
x
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Nonlinear Systems
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} Complex Motion
} 𝐹=𝑚𝑔sin (𝜃)
} 𝐹=𝑎𝑥+𝑏𝑥↑3
} 𝐹= 𝛿↑3/2
• Unpredictable Response/Missing Math Tools • Larger Amplitude • Complex Dynamics • Not Harmonic • Not Described by Transfer Functions
Advantages/ Disadvantages
U(x)
x
𝛿
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𝛿
𝐹𝑜𝑟𝑐𝑒= 𝐴 𝛿↑3/2 Nonlinear Compression
𝐹𝑜𝑟𝑐𝑒=0 Tensionless behavior
Leads to a Tunable Stiffness 𝐶= 3/2 𝐴𝛿↓0↑1/2 𝐶= 3/2 (𝐴𝐹↓0 )↑1/3
Hertz, H. (1882). Ueber die Berührung fester elastischer Körper. Journal für die reine und angewandte Mathematik (Crelle's Journal). 1882: 156.
Granular Crystals
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Granular Crystals
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C m C m C m C m C m C m m
𝐹↓0
𝐵𝑐𝑜𝑠(2𝜋𝑓𝑡)
Modeled as a Nonlinear Lattice
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Energy Harvesting in Perspective
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How & Where does Nonlinear Mechanics fit in?
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Frontiers of Energy Research
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1. Nonlinear Resonance for Stability & Energy
2. Ambient (Vibrational) Energy Harvesting
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Resonance
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Tacoma Narrows Bridge
Billah, K.; R. Scanlan (1991). "Resonance, Tacoma Narrows Bridge Failure, and Undergraduate Physics Textbooks" (PDF).American Journal of Physics 59 (2): 118–124. Bibcode:1991AmJPh..59..118B. doi:10.1119/1.16590.
1. Forced Resonance 2. Aeroelastic Flutter – Dynamic Instability
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2. Nonlinear Resonance for Stability and Energy
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§ Why use nonlinear systems? 1. Frequency Shifting
2. Predictable Breakdown
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2. Nonlinear Resonance for Stability and Energy
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§ Why use nonlinear systems? 1. Frequency Shifting
2. Predictable Breakdown
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2. Nonlinear Resonance for Stability and Energy
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Instability – Grows to High Amplitude
and Stabilizes
Low Amplitude State is Stable
Takeaway Message: Frequency Shifting
Stabilizes the Resonance
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Solution
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2. Nonlinear Resonance for Stability
} Design Structures around resonances to more efficiently couple with harmonic energy sources nature.
} Use Nonlinear Mechanics to achieve a predictable breakdown mechanism.
} Harvest Energy in this high amplitude state.
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Frontiers of Energy Research
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1. Nonlinear Resonance for Stability & Energy
2. Ambient (Vibrational) Energy Harvesting
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1. Ambient (Vibrational) Energy Harvesting
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1. Ambient (Vibrational) Energy Harvesting
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} Low Power } My Samsung – 7.98Wh } 220 mW Avg. Consumption
} Tunable Nonlinearity } Different Amplitude Signals
} Distributed Energy } 1𝑚↑2 =10,000𝑐𝑚↑2
} Localization Mechanism
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Tunable Localization
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Introduce a resonator defect to localize energy.
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Localization in Granular Crystals
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Measure Signal from Far Force Sensor
(i.e. bright region corresponds delocalized)
Localized
Delocalized
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Control Localization
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Increase Static Compression
Delocalize Mode
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Conclusion
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} Nonlinear Mechanics introduces new possible directions for energy research
1. Localize low amplitude vibrations } For more efficient energy harvesting
2. Utilize Resonances to more efficiently couple to natural systems
} Nonlinear systems can be used to stabilize the oftentimes destructive breakdowns
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Acknowledgments
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} The Entire Daraio Group } Marc Serra Garcia
} Georgios Theocharis - UMR-CNRS - Universit e du Maine } ETH – IDES
} Funding Grants } NSF CMMI CAREER (844540) } US-AFOSR (FA9550-12-1-0332)
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Questions
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