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안찬우,최석창,박일수,김동영,홍도관 동아대학교 생산기술연구소 2002 生産技術硏究所硏究論文集 Vol.7 No.2
The vibration of turbo fan using in the work place widely is due to various cause and it gives arise to unnecessary noise and life reduction. To solve these vibration problems, it need to be grasped of the source at first and then established the suitable counterplan for vibration-proof. In this part, after the vibration characteristic of turbo fan was analyzed by the experiment and then to estimate the existence of fault by the badness of design and manufacturing and to choose the suitable vibration isolator to reduce the vibration travelling to the base are included. In this study, the vibration characteristic of turbo fan was analyzed by using the FFT spectrum and the order tracking analysis methods and it was found out through the experiment that the vibration-proof spring was more effective than the existing vibration-proof rubber as the isolator to reduce the vibration travelling to the base.
기반의 조화운동을 받는 감쇠진동계에 부착된 동흡진기의 특성에 관한 연구
안찬우 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.2
A study on the dynamic vibration absorber with coil spring and oil damper is carried out both theoretically and experimentally. A main mass is connected to a foundation through three coil spring and an oil damper. A harmonic motion is applied to the foundation. The effects of the dynamic vibration absorber on the acceleration amplitude ratio are theoretically summarized in graphs, and tested on a vibratory model. As a result, the first resonance acceleration amplitude ratio is decreased and the second resonance acceleration amplitude ration is increased as the absorber mass increase. When the absorber spring constant increase, the first resonance acceleration amplitude ration is increased and the second resonance acceleration amplitude ration is decreased.
반응표면 분석법을 이용한 마이크로 스피커 다이아프램의 형상최적설계
안찬우,홍도관,우병철,박일수,권용수,최재기 동아대학교 생산기술연구소 2006 生産技術硏究所硏究論文集 Vol.11 No.-
This study uses a characteristic function to explain correlations between the objective function and design variables. Analysis of means and table of orthogonal array were carried out. The change of shape of diaphragm, thickness of diaphragm and voice coil weight based on the table of orthogonal array is made. Therefore, this study carried to decide design variables for minimizing 1st natural frequency and maximizing 2nd natural frequency of diaphragm using design of experiments and characteristic function with constraints. We showed improved design variables.
안찬우,정현,김예진 한국특수체육학회 2023 한국특수체육학회지 Vol.31 No.4
This study sought to understand the subculture of park golf clubs by classifying and examining the characteristics of the sub-culture by type. For this purpose, eight people who were active in the park golf club were selected as research participants and data was collected through in-depth interviews and participant observation. The collected data were converted into text data through transcription, and the following conclusions were drawn through the analysis process of categorization and conceptualization of meaning. First, the characteristics of the park golf club's game management were the game expedition culture, betting culture, and enforced norm culture. Second, the social relationship characteristics of the park golf club were found to be positive and negative social relationship characteristics. Third, the cultural characteristics of the park golf club were showing off expensive equipment, improving the sense of belonging to the club through monthly meetings, and self-achievement through obtaining certification.
안찬우,홍성철 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Sulfonyl azide group, RSO<sub>2</sub>N<sub>3</sub>, generates reactive nitrene intermediate by heat or irradiation. The nitrene functionality may then react with C-H bonds of hydrocarbon compound, resulting in modification of the compound. As a model study, non-catalytic and solvent-free postpolymerization modification of polyethylene was attempted employing polystyrene with sulfonyl azide functionality. Firstly, azo based initiator containing the sulfonyl azide functional groups was synthesized, followed by the polymerization of styrene using the initiator to afford polystyrene end-functionalized with sulfonyl azide groups (PS-SA). Commercially available high-density polyethylene (HDPE) was then thermally treated with the PS-SA by using Brabender melt mixer. The modified HDPE exhibited improved tensile mechanical properties, suggesting the potential of this value-adding approach as an efficient technical platform to modify various polymers.
안찬우,박일수,최석창,이봉진,최인호 동아대학교 환경문제연구소 1995 硏究報告 Vol.18 No.2
The angular vibration displacement & velocity of ø10, ø16, ø20 shafts were experimentally invistigated changing the rotational speed from 600rpm to 1650rpm through torsional vibration meter to verify the characteristics of torsional vibration of the fixed-fixed shafts The results obtained are as follows. 1. The maximum angular vibration displacement of ø10 shaft occured in 1050rpm and the angular vibration displacement of ø16, ø20 shafts are decreased according to increasing the rotational speed. 2. The angular vibration velocity of $16 shaft is decreased according to increasing the rotational speed and the minimum angular vibration velocity of ø20 shaft was shown in 600rpm, 1200rpm. 3. The angular vibration displacement & velocity of the shaft are decreased according to increasing the diameter in the aspect of torsional vibration of the fixed-fixed shafts.
안찬우,최석창,이희범,이봉진 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.1
This paper presents with dual dynamic vibration absorber consisting of mass, coil spring and oil damper attached to primary vibration system with damping. The effects of dual dynamic vibration absorber were investigated with optimizing equation which equalizes the height of amplitude ratio in the resonance frequency of the primary vibration system and numerically obtaining curves of resonance frequency ratio on the primary vibration system and dual dynamic vibration absorber according to mass ratio, natural frequency ratio and damping ratio of dynamic vibration absorber. The variation of amplitude ratio related to frequency ratio of primary vibration system is verified experimentally and theoretically according to dual dynamic vibration systems using computer program designed to find mutual relationship between dual dynamic vibration absorber.
자동차용 Seat Adjust DC Motor의 NVH 저감에 관한 연구
안찬우,홍도관,권용수,최재기,허윤 동아대학교 생산기술연구소 2006 生産技術硏究所硏究論文集 Vol.11 No.-
Recently, usage of DC motor is increasing for vehicle convenience and safety. According to trend, interest for noise and vibration are increasing too. In this paper, decrease of noise & vibration for Compact motor (which) developed for vehicle miniaturization and lighten will be studied. All of test implemented under actual load. Natural frequency of each parts are measured through modal & Random excite except resonance by Natural frequency.
안찬우,이동현,백준현,김일,홍성철 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Carbon dioxide (CO<sub>2</sub>) released as waste in various industry is major cause of global warming issues. In this regard, the utilization of CO<sub>2</sub> as a sustainable feedstock for chemical products is attractive research topic. In this study, difunctional and multifunctional CO<sub>2</sub>-based poly(ether carbonate) (PEC) polyols were successfully prepared by using double metal cyanide catalyst. Difunctional CO<sub>2</sub>-based PEC polyol successfully replaced ~ 47.2 wt% of conventional petroleumbased polyol in bi-polyol mixture for the preparation of rigid polyurethane foams (RPUFs). The RPUF was also successfully prepared employing multifunctional CO<sub>2</sub>-based PEC polyol alone. Characteristics of the RPUFs, such as density, compressive strength, thermal conductivity, thermal stability and cell morphology were then investigated investigated, demonstrating the potential of the CO<sub>2</sub> conversion pathway as an eco-friendly and sustainable technique to provide industrially important RPUFs.