This paper presents design optimization of an electromagnetic vibration energy harvester to improve durability and increase life cycle. The energy harvester discussed in this paper has been developed by the Korean Railroad Research Institute, as a maintenance-free power supply for a wireless sensor module that monitors rail bogie axles and bearings. Our research team realized a durability issue in the leaf spring in this harvester because of high stress concentration and the corresponding fatigue failure when the harvester experiences high impact loading in rail operation. The topology optimization method has been applied in this research to design the shape of the leaf spring with a lower stress concentration magnitude while satisfying the multiple functional requirements on vibration amplitude and natural frequency. For fast and effective design search, we firstly identified several initial models from literature. These models have been carefully chosen to minimize any unnecessary parasitic motions. The topology optimization is then applied to produce the new leaf spring structure. The results of this research showed that topology optimization method could reduce the magnitude of stress concentration while satisfying required vibration amplitude and natural frequency of the spring structure.
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ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 28–30, 2016
Stowe, Vermont, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5049-7
PROCEEDINGS PAPER
Improving Durability of a Vibration Energy Harvester Using Structural Design Optimization Available to Purchase
Saman Nezami,
Saman Nezami
University of Maryland at Baltimore County, Baltimore, MD
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Soobum Lee,
Soobum Lee
University of Maryland at Baltimore County, Baltimore, MD
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Kiweon Kang,
Kiweon Kang
Kunsan National University, Kunsan, Korea
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Jaehoon Kim
Jaehoon Kim
Korean Railroad Research Institute, Uiwang-si, Korea
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Saman Nezami
University of Maryland at Baltimore County, Baltimore, MD
Soobum Lee
University of Maryland at Baltimore County, Baltimore, MD
Kiweon Kang
Kunsan National University, Kunsan, Korea
Jaehoon Kim
Korean Railroad Research Institute, Uiwang-si, Korea
Paper No:
SMASIS2016-9301, V002T07A018; 7 pages
Published Online:
November 29, 2016
Citation
Nezami, S, Lee, S, Kang, K, & Kim, J. "Improving Durability of a Vibration Energy Harvester Using Structural Design Optimization." Proceedings of the ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 2: Modeling, Simulation and Control; Bio-Inspired Smart Materials and Systems; Energy Harvesting. Stowe, Vermont, USA. September 28–30, 2016. V002T07A018. ASME. https://doi.org/10.1115/SMASIS2016-9301
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