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이제윤(Jaeyun Lee),오재근(Jae-geun Oh),최범규(Bumkyoo Choi),전재형(JaeHyung Chun),김주곤(JooGon Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
70% of energy exhausted in the types of energy losses, such as vibration, thermal and noise, during the vehicle driving. This study suggests energy conversion system with piezoelectric materials using vibration that is a kind of energy losses. Energy conversion system is validated in the lab with a shaker by the measured acceleration data for driving on the road. The results of driving acceleration are 0.4g at 10㎐. Energy conversion system is designed to own the natural frequency at 10㎐. Experiments result in 150V(pk-pk) and 25㎽(rms) at 0.4g, 10㎐. Power consumption for wireless communication and data transmission is about 45㎽. Suggested energy conversion system can power a sensor system to transmit acquisition data from sensors every two seconds. Therefore, this study is meaningful access to adopt wireless sensor system inside the vehicle.
주행 중 타이어 변형을 이용한 자가 발전 시스템에 관한 연구
이제윤(Jaeyun Lee),오재근(Jaegeun Oh),전재형(Jaehyung Jun),김주곤(Joogon Kim),최범규(Bumkyoo Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The intelligence of the tire supporting the body and contacting with the road is vital to improve the safety of the vehicle while driving. To install the sensors for measuring behavior of the tire is necessary. However, It is difficult to apply a wired system on the wheel. It is necessary to implement an self-powering system to be mounted inside the tire . The purpose of the study is to convert the strain energy caused by deformation of the tire during driving into electrical energy. For the energy conversion, the usage of a flexible piezofiber is suitable to tire application. The amount of strain varied by speed, load and the tire internal pressure is measured according to two axial directions to primarily evaluate the amount of available strain energy. The amount of strain is changed from 700 to 5800 micro strain. Also, to predict generated energy from a tire, the analysis of the relationship between strain and voltage is performed and tests for the impedance matching between piezofiber and circuit are conducted to optimize external loads for transferring energy efficiently. Based on above results, 0.58mJ electrical energy can be generated by using the lateral direction strain(700 to 150 micro) showing minimal variation on the tire. The results of this study is expected to enhance the possibility of the self-generation type wireless sensor system.
스플릿 코어 설계를 위한 성능 분석 및 자기코어의 B-H curve 예측을 위한 멀티피직스 해석 시스템
이명서(Myungseo Lee),김민중(Minjoong Kim),이제윤(Jaeyun Lee),송지환(Jihwan Song) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Energy harvesting based on the current transformer (CT) method has been receiving great attention related to the design of low-power devices. It is important to understand the magnetic behavior of CT materials, such as B-H curve, to develop high-performance CT. Herein, we propose an intuitive method to predict B-H curve. The performance of CT, which is numerically calculated using the obtained B-H curve, shows high accuracy compared to the experimental performance. Additionally, we have analyzed the performance deterioration of the split core due to the existence of an air gap. With the simulation, the effective air gap range of the split core is obtained to show the performance, equivalent to that of the ring core. The proposed method provides an intuitive approach for predicting and estimating the performance of CT devices, which can be a useful guide for designing energy harvesting devices.
오재근(Jae-geun Oh),이제윤(Jaeyun Lee),최범규(Bumkyoo Choi),김주곤(JooGon Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This research focused on the battery-less real time tire pressure monitoring system by the use of a SAW device and micromachined pressure sensor. A SAW device acts as a wireless transponder without power sources such as battery, wired DC power, etc. Research results represent the optimistic feasibilities of intelligent tire sensor which should be operated without battery. For developing a SAW based passive radio tire pressure sensor and a monitoring system, we developed sensor systems such as a micro-machined touch-down mode capacitive pressure, low insertion loss SAW transponder and a high gain(over 77㏈) single heterodyne coherent dynamic rf. reader system with high speed(100MIPS) MCU based ECU, etc. The outstanding research results of developed passive radio sensor and reader system were the detection range about 3 meters without violation of international regulation, which is below 10㎽ transmitting power level at the frequency of 433㎒ ISM(Industrial, scientific and medical) band, and the adequate micromachined capacitive sensor's capacitance change if using touch-mode method. The normal capacitive pressure sensor's FOM(Figure of merit) is 1 or less. However, developed touch-mode capacitive pressure sensor's FOM was 4.This result shows large SNR affecting long range detection capability.
Tire 내부 가속도센서를 이용한 Tire Force 추정 방법 연구
전재형(Jaehyung Chun),박인혜(Inhye Park),윤호상(Hosang Yoon),이제윤(Jaeyun Lee),정삼현(Samhyeon Jung),허승진(Seungjin Heo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
본 연구에서는 외부 조건 변화에 따라서 타이어 내부에 장착된 3축 가속도 센서의 출력 값과 Flat Trac 시험기 출력 값의 비교를 통해 가속도 센서를 이용한 Tire Force estimation 적용 가능성을 검토하였다. 외부조건은 차속, 수직하중, 타이어 압력, slip angle 등을 조건 별로 인가하며, 가속도 센서 x, y, z 축의 출력변화를 모니터링 하였다. 이렇게 얻어진 출력 값은 타이어와 노면이 접지하는 구간을 구분하여 데이터 유효구간을 검출하였고, 가속도 센서 출력 데이터 신호 처리를 통해 실제 타이어에 인가되는 힘과의 관계를 검토하였다.