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회전하는 타이어의 동특성을 고려한 진동에너지 하베스터 성능 예측

Performance Prediction of Vibration Energy Harvester considering the Dynamic Characteristics of Rotating Tires

  • 나혜중 (영남대학교 공업기술연구소)
  • Na, Hae-Joong (Institute of Industrial Technology, Yeungnam UNIV.)
  • 투고 : 2020.09.02
  • 심사 : 2020.10.05
  • 발행 : 2020.10.31

초록

In general, tires require various sensors and power supply devices, such as batteries, to obtain information such as pressure, temperature, acceleration, and the friction coefficient between the tire and the road in real time. However, these sensors have a size limitation because they are mounted on a tire, and their batteries have limited usability due to short replacement cycles, leading to additional replacement costs. Therefore, vibration energy harvesting technology, which converts the dynamic strain energy generated from the tire into electrical energy and then stores the energy in a power supply, is advantageous. In this study, the output voltage and power generated from piezoelectric elements are predicted through finite element analysis under static state and transient state conditions, taking into account the dynamic characteristics of tires. First, the tire and piezoelectric elements are created as a finite element model and then the natural frequency and mode shapes are identified through modal analysis. Next, in the static state, with the piezoelectric element attached to the inside of the tire, the voltage distribution at the contact surface between the tire and the road is examined. Lastly, in the transient state, with the tire rotating at the speeds of 30 km/h and 50 km/h, the output voltage and power characteristics of the piezoelectric elements attached to four locations inside the tire are evaluated.

키워드

참고문헌

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