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Wobbling Mass를 고려한 인체 진동 모델의 개발
김영은(Youngeun Kim),백광현(Kwanghyun Baek),최준희(Junhee Choi) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.2
Simple spring-damper-mass models have been widely used to investigate whole-body vertical biodynamic response characteristics of the seated vehicle driver. Most previous models have not considered the effect of wobbling masses; i.e. heart, lungs. liver, intestine, etc. In this study, 4-DOF seated driver model including one non-rigid mass representing wobbling visceral mass. 5-DOF model including intestine, and 1O-DOF model including five lumbar vertebral masses were proposed. The model parameters were identified by a combinatorial optimization technique, simulated annealing method. The objective function was chosen as the sum of error between model response of seat-to-head transmissibility and driving point mechanical impedance and those of experimental data for subjects seated erect without backrest support. The model response showed a good agreement with the experimental response characteristics. Using a 19-DOF model, calculated resonance frequency of lumbar spine at 4Hz was matched well with experimental results of Panjabi et al.
김수형(Soo-Hyung Kim),김태형(Tae-Hyung Kim),정진영(Jean-Young Jeong),박관호(Kwan-Ho Park),이경록(Gyeong-Rok Lee),백광현(Kwanghyun Baek),송지현(Ji-Hyeon Song) 대한기계학회 2022 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.10 No.1
최근 COVID-19에 의해 택배 물량이 급증하면서 플라스틱 쓰레기가 하루 평균 약 850톤으로 지난해 대비 16% 증가했다. 이런 상황에서 폐플라스틱의 올바른 분리수거 방법이 중요해지고 있다. 환경부에 따르면, 올바른 페트병 분리수거 방법은 내용물을 비우고, 뚜껑, 라벨 제거 후, 찌그러트려 버리는 것이다. 이 방법이 가장 효율적이고 재활용 가능성이 높다고 설명한다. 본 연구에서는 페트병의 라벨을 제거하는 것을 가장 우선적으로 해결해야 할 문제로 판단하였고, 그에 따른 주거지 분리수거장용 및 가정용 라벨 제거기를 설계하였다. 개념 설계부터 3D 모델링, 제작까지 공학적 해석을 바탕으로 수행하였으며, 실제 구동 시 15~40초의 구동 시간 내에 성공적으로 페트병 라벨이 제거됨을 확인했다. The average volume of plastic waste is around 850 tons per day, which has increased by 16% from the last year, as the volume of parcel delivery has soared due to COVID-19. In this situation, recycling the waste plastic is becoming important. According to the Ministry of Environment, the most efficient method to recycle PET bottles is to empty the contents, remove the lid and label, and crush them. In this research, we determined that removing labels from PET bottles is the first issue to be addressed, and design a residential PET bottle label peeler. The design process including conceptual design, 3D modeling, and production was carried out based on engineering analysis. The PET bottle label was successfully removed within the driving time of 20 to 40 seconds on different shapes and sizes of the PET bottle.