Modeling and design of electromagnetic and piezoelectric chest strain energy harvesters including soft tissue effects

Tahzib Safwat; Zoubeida Ounaies; Christopher D. Rahn

doi:10.1117/12.2296672

16 March 2018 Modeling and design of electromagnetic and piezoelectric chest strain energy harvesters including soft tissue effects

Tahzib Safwat, Zoubeida Ounaies, Christopher D. Rahn

Author Affiliations +

Proceedings Volume 10595, Active and Passive Smart Structures and Integrated Systems XII; 105951W (2018) https://doi.org/10.1117/12.2296672
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

Breathing produces chest motion 24 hours a day, hence it is ideal for continuous energy harvesting of up to milliwatt scale power levels. A soft band wrapped around the chest can extend by centimeters at relatively low force levels. A stiff band extends at higher force levels but with some discomfort to the user. Chest strain energy harvesters must balance power generation and the soft tissue compression associated with user discomfort. This paper explores the modeling and analysis of wearable chest strain energy harvesters that use electromagnetic generators and piezoelectric polymers including the effects of soft tissue compliance. Electromagnetic generators are shown to produce more power than piezoelectric polymers during deep breathing. During shallow breathing, however, the polymer harvester performs better because static friction and soft tissue compression limit power generation in the electromagnetic harvester.

Citation Download Citation

Tahzib Safwat, Zoubeida Ounaies, and Christopher D. Rahn "Modeling and design of electromagnetic and piezoelectric chest strain energy harvesters including soft tissue effects", Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 105951W (16 March 2018); https://doi.org/10.1117/12.2296672

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