[논문]압전 에너지 하베스팅을 이용한 신발용 발열 시스템 개발

이승진; 이상웅; 신희근; 김기만; 최성대

doi:10.14775/ksmpe.2019.18.7.048

압전 에너지 하베스팅을 이용한 신발용 발열 시스템 개발
Development of Shoe-heating System based on Piezoelectric Energy Harvesting 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.18 no.7, 2019년, pp.48 - 55

이승진 (금오공과대학교 대학원 기계시스템공학과) , 이상웅 (금오공과대학교 대학원 기계시스템공학과) , 신희근 (금오공과대학교 대학원 기계시스템공학과) , 김기만 (금오공과대학교 대학원 기계시스템공학과) , 최성대 (금오공과대학교 대학원 기계시스템공학과)

Abstract ▼ AI-Helper

Soldiers have been exposed to the risk of chilblains in cold winters. Recent studies have described sensors and IOT devices that use independent power sources based on piezoelectric energy harvesting. Therefore, the heated shoes with an independent power source have been developed. For the application of energy harvesting to shoes, it is necessary to develop a unique harvester by considering human gait characteristics. Energy harvesters and ceramics were designed and fabricated in this study. The performances of these harvesters and ceramics were evaluated experimentally. Then, the harvesters and ceramics with superior performance were selected and applied to the system. Thereafter, the heating and charging performance of the system was tested under real walking conditions. The results show that the developed system can generate adequate energy to charge the battery and heat the shoes.

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가설 설정

2. According to the experimental results, the direct energy harvester provides stronger load amplification and a higher output voltage.

제안 방법

Therefore, the load is amplified according to the leverage principle and applied to the ceramics. Assuming that a concentrated load is applied at the end of the harvester, the load amplification ratio is determined by the ratio of R1 and R2, and in this study, the load amplification ratio was set to 1:3.
To evaluate the performance of the system and the effects of real-world conditions, we conducted two experiments. In the first of these experiments, a man weighing 90 kgf was asked to wear shoes equipped with the developed system and walk around, and the resulting changes in battery voltage and shoe temperature were measured.
Ingenious harvester development is needed to consider the characteristics of human gait. In this study, two types of energy harvesters, indirect and direct, are developed using multi-layered ceramics and considering their energy-conversion efficiency.
In this study, we focused on a piezoelectric energy harvesting system optimized for shoes and developed a heating system based on it. To develop a system optimized for shoes, a scheme for energy harvesting considering human gait characteristics was proposed.
The shoe-heating system was built using the direct energy harvester and SA050510 (product of PiezoDrive) based on the results obtained earlier in this study. To evaluate the performance of the system and the effects of real-world conditions, we conducted two experiments.
In the prior test, which is evaluating ceramics fabricated in this study, compression speed affected the output voltage. Therefore, the experimental method was changed, and the experiment was conducted using triceps-pushdown machine. We set the weight to be applied and placed the jig to which the ceramics were fixed on the testing machine.

데이터처리

Deformation analysis of the direct energy harvester was conducted through ANSYS. The analysis results obtained by applying a force of 600 N to the end of the harvester are shown in Fig.

이론/모형

Raw PMN-PZT powder, solvent, and binder were mixed to form a slurry, which was matured for 24h. A tape-like ceramic sheet was formed from the matured slurry by using the doctor blade method. The ceramic sheet was cut into 8 rounds that ∅ were then placed under a silkscreen, which is shown in Fig.

성능/효과

1. The results of the experiments conducted with two types of piezoelectric ceramics show that the ceramic mass-produced by PiezoDrive has higher capacitance and higher output voltage than the ceramic fabricated in this study.
3. In the charging experiment involving real walking, the battery voltage increased by approximately 0.12 V from 2.62 V to 2.74 V, which demonstrates that the developed energy harvesting system can charge the heating system battery.
4. In the heating experiment, the toe temperature on the foot with the heating-system-equipped shoe was approximately 4.8 ℃ higher than that on the foot with the ordinary shoe. This result indicates that the heating system with the independent power source can generate sufficient heat.

참고문헌 (10)

Kim, K. J., Lee, G. Y., Rho, N. K., Kim, W. S., Kwon, Y. H., “Original Article : Clinical Features of Chilblain in Korean Soldiers”, Korean Journal of Dermatology, Vol. 45, No. 10, pp. 996-1003. 2007.
Kim, B. Y., Nam, S., “Understanding and Convergence Research about Technology of Piezoelectric Energy Harvesting and 3D Printing”, CERAMIST, Vol. 18 No. 4, pp. 5-12, 2015.
Moon, S. P., Kim, T. W., Kim, S. H., “Technological Overview and Study Trends of Energy Harvesting”, The Korean Institute of Electrical Engineers, Vol. 65, No. 5, pp. 7-15, 2016.
Jang, H. D., “Study on the Design Method of the Energy Harvesting Smart Sensor for Implementing IoT Service”, Journal of Korea Institute of Information, Electronics, and Communication Technology, Vol. 11, No. 1, pp. 89-93, 2018.
Kim, S. W., “Study and Technology on Energy Harvester”, The Korean Institute of Electrical Engineers, Vol. 62, No. 11, pp. 10-18, 2013.
Jung, J. Y., Park, C. W., Pyo, C. S., “Investigation on Energy Harvesting Technology Trends for IOT”, The Proceedings of the Korea Electromagnetic Engineering Society, Vol. 27, No. 4, pp. 40-50, 2016.
Mo, S. G., “Study on energy conversion of piezoelectric device applicable for shoe inserts”, A Thesis for a Doctorate, Hansei University, Republic of Korea, 2016.
10.5050/KSNVE.2014.24.11.890 Kim, J. E., Kim, Y. C., Sun, K. H., “Performance Characteristics of Vibration Energy Harvesting Using [001] and [011]-Poled PMN-PZTSingle Crystals”, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 24, No. 11, pp. 890-897, 2014.

원문보기 상세보기
10.4313/JKEM.2016.29.10.601 Cho, J. H., Paik, J. H., Park, W. I., Lee, M. S., Yun, J. S., Hong, Y. W., Park, Y. H., Jeong, Y. H.. “Characteristics and Fabrication of Multi- Layered Piezoelectric Ceramic Actuators for Speaker Application”. Journal of the Korean Institute of Electrical and Electronic Material Engineers, Vol. 29, No. 10, pp. 601-607, 2016.

원문보기 상세보기
10.1016/j.energy.2017.12.159 Turkmen, A. C., Celik, C., “Energy harvesting with the piezoelectric material integrated shoe”, Energy, Vol. 150, pp. 556-564, 2018.

상세보기

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압전 에너지 하베스팅을 이용한 신발용 발열 시스템 개발
Development of Shoe-heating System based on Piezoelectric Energy Harvesting 원문보기

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압전 에너지 하베스팅을 이용한 신발용 발열 시스템 개발 Development of Shoe-heating System based on Piezoelectric Energy Harvesting 원문보기

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압전 에너지 하베스팅을 이용한 신발용 발열 시스템 개발
Development of Shoe-heating System based on Piezoelectric Energy Harvesting 원문보기

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