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강연준(Yeon Jun Kang),민동우(Dongwoo Min),송현진(David P. Song),김형건(Hyoung Gun Kim),조문환(Munhwan Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The purpose of this study is to optimize the acceleration operational data at suspension link pivotal point for Transfer Path Analysis (TPA). Generally, acceleration signal obtained at pivotal point contains not only fore-aft, radial, and tangential direction component but also undesirable rotational signal. An experimental approach to eliminate undesirable rotational signal is studied by adding extra accelerometer on the opposite side of where the original pivotal point acceleration is obtained. The acceleration signals at suspension link pivotal point are compared to one another then, averaged with phase. This averaged acceleration spectrum is then validated through TPA results.
S시 하수처리장의 잠재 에너지원 활용과 온실가스 감축 효과 분석 연구
강연준 ( Yeon-jun Kang· ),장용철 ( Yong-chul Jang† ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회지 Vol.36 No.1
The purpose of this research was to examine energy recovery potentials and utilization of sewage heat, digestion gas, and sewage sludge from a municipal wastewater treatment plant in city S. This study analyzed the reduction of greenhouse gas, improvement of energy self-efficiency, and economic benefits due to the recovery of unutilized energy sources from the site. We found that energy self-efficiency may improve from 51.6% (as of 2015) to 115%. The energy recovery of unutilized energy may help wastewater treatment plants achieve over 100% energy self-efficiency. The annual estimated reduction potentials of greenhouse gases were approximately 422,762 tCO<sub>2</sub>, 18,984 tCO<sub>2</sub>, and 73,693 tCO<sub>2</sub> from sewage heat, digestion gas, and sewage sludge, respectively. These accounted for 25% of greenhouse gas emissions from the wastewater treatment plant in 2015. Economic benefits of the recovery were 120.5 billion KRW won per year in total savings as follows: sewage heat (116 billion KRW won), digestion gas (3.2 billion KRW won), and sewage sludge (900 million KRW won). By considering energy recovery from unutilized sources from municipal wastewater treatment plants, energy self-efficiency and greenhouse gas reduction can be improved and economic savings can be achieved.
차대 동력계에서 자동차 구속조건에 따른 거동 특성 비교
강연준(Yeon Jun Kang),김희수(Heesoo Kim),David P. Song,민동우(Dongwoo Min) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
The primary purpose of this study is to observe the dynamic behavior within a vehicle on chassis dynamometer throughout cleat impact testing with two different constraining setups (Tie-down strap and one point fixation). Throughout this empirical experiment, no outstanding dynamic behavior characteristics are observed between two setups and thus, the performance of the one point fixation device is validated. Neither the interior noise nor acceleration at driver seat rail and knuckle is heavily influenced by two different constraining methods. However, one point fixation is far more advantageous considering its shorter set up time and its capability of measuring traction force with its built in force sensor.
노면 가진으로부터 차체로 전달되는 구조기인 힘 측정장비에 대한 연구
강연준(Yeon Jun Kang),David P. Song,민동우(Dongwoo Min) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
The primary purpose of this study is to verify the suspension force rig which is developed for structure-borne road noise analysis prior to availability of vehicle boy. With Continuous increase market of hybrid and electrical vehicle, NVH engineers endeavor to improve vehicle road noise thoroughly. However, tackling the vehicle road noise is known for one of the most difficult NVH issue until now because NVH engineers and R&H engineers must reach a compromise between quieter interior noise and crisp handling. To achieve such, identifying the body input force is crucial and thus, a suspension rig which enables direct force measurement has developed. In this paper, the suspension rig is verified through a comparative analysis with the actual baseline vehicle measureme nt with varying tire pressure, rig mass, and suspension parameters up to 300 Hz.