Piezoelektrik Yama Dönüştürücülerle Diz Hareketinden Enerji Hasadı

Abstract

Bu çalışmada insanların yürüyüşleri esnasında diz hareketinden enerji elde edebilen bir piezoelektrik enerji hasadı aygıtının geliştirilmesi ve test edilmesi ele alınmıştır. Aygıt diz çevresine yerleştirmek üzere optimize edilmiş ve minimal ölçülere sahip iki adet MEMS tabanlı piezoelektrik yama dönüştürücüden oluşmaktadır. COMSOL programında yapılan simülasyonlar ile normal yürüme sırasında elde edilebilecek maksimum performans incelenmiştir. Piezoelektrik dönüştürücülerin iç kapasitans ve dirençlerinin 80 nF ile 470 kohm mertebesinde olduğu ölçülmüştür. Dönüştürücüler bir gönüllünün taktığı dizliğe yerleştirilerek, üretilen gerilim ve güç değerleri test edilmiştir. Yürüme sırasında maksimum 14 V ve 6.2 uW rms güç elde edilmiştir. Bu değerlerin orta hızlı koşma esnasında 14.4 V ve 12uW’a çıktığı gözlemlenmiştir. Ölçülen gerilim ve güç değerleri, bu aygıtın giyilebilir elektronik aletleri çalıştırabilme ve bu aletlerin pillerini sürekli şarj edebilme potansiyelini ortaya koymaktadır.

Keywords

• enerji hasadı,piezoelektrik,diz hareketi,yürüme hareketi,Power MEMS

Energy Harvesting from Knee Motion Using Piezoelectric Patch Transducers

Abstract

This paper presents a piezoelectric energy harvesting device that generates electrical power from knee motion during human gait. The device is composed of two MEMS-based piezoelectric patch transducers optimized for placement around knee joints with minimal footprint. Simulations were performed on COMSOL software to reveal maximum performance that can be achieved under normal walking conditions. The internal capacitance of the patch transducers was measured to be 80 nF, while the resistance was on the order of 470 k. The patch transducers were inserted in a knee brace worn by a volunteer subject, and were characterized for voltage and power generation. During walking, the maximum open circuit voltage and rms power were measured to be 14 V and 6.2 W, respectively. These values were observed to increase up to 14.4 V and 12 W during a moderate running activity. The level of power achieved in the experiments shows the potential of this device as an independent onboard power component and as a continuous battery charger for wearable electronic devices. 

Keywords

• energy harvesting,piezoelectricity,knee motion,human gait,Power MEMS

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