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흡음재 및 제진재의 최적배치를 이용한 구조-음향 연성계의 소음제어
김동영(Kim, Dong-Young),홍도관(Hong, Do-Kwan),안찬우(Ahn, Chan-Woo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
The absorbing material is mostly used to changing the acoustic energy to the heat energy in the passive control, and that consists of the porous media. That controls an air borne noise while the stiffened plates, damping material and additional mass control a structure borne noise. The additional mass can decrease the sound by mass effect and shift of natural frequency, and damping material can decrease the sound by damping effect. The passive acoustic control using these kinds of control materials has an advantage that is possible to control the acoustic in the wide frequency band and the whole space at a price as compared with the active control using the various electronic circuit and actuator. But the space efficiency decreased and the control ability isn't up to the active control. So it is necessary to maximize the control ability in the specific frequency to raise the capacity of passive control minimizing the diminution of space efficiency such an active control. Therefore, the characteristics of control materials and the optimum layout of control materials that attached to the boundary of structure-acoustic coupled cavity were studied using sequential optimization on this study.
엔드밀 가공시 진동, 표면거칠기, 절삭온도에 미치는 최적가공조건에 관한 연구
홍도관(Hong, Do-Kwan),김동영(Kim, Dong-Young),안찬우(Ahn, Chan-Woo) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
End-milling has been used widely in industrial system because it is effective to a material manufacturing with various shapes. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in precision machine part and electronic part. The optimum mechanical vibration of main spindle, surface roughness and cutting temperature have an effect on end-milling condition such as, cutting direction, revolution of spindle, feed rate and depth of cut, etc. Therefore, this study carried to decide the working condition for optimum mechanical vibration of main spindle, surface roughness and cutting temperature using design of experiments, ANOVA and characteristic function. From the results of experimentation, mechanical vibration has an effect on revolution of spindle, radial depth of cut, and axial depth of cut. The surface roughness has an effect on cutting direction, revolution of spindle and depth of cut. And then the optimum condition used design of experiments is upward cutting In cutting direction, 600 rpm in revolution of spindle, 240 mm/min in feed rate, 2 mm in axial depth of cut and 0.25 mm in radial depth of cut. By design of experiments and characteristic function, it is effectively represented shape characteristics of mechanical vibration, surface roughness and cutting temperature in end-milling.
홍도관(Do-Kwan Hong),김동영(Dong-Young Kim),한동섭(Dong-Seop Han),안찬우(Chan-Woo Ahn),한근조(Geun-Jo Han) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.3
본 연구에서는 항만하역장비인 스프레더용 충격흡수기의 개발을 위해 스프링과 오일댐퍼로 구성된 세 가지 형태의 모델에 대한 동적응답을 유한요소해석에 의해 수행하였다. 또한, 세 가지 모델의 충격흡수기에서 피스톤의 제한된 행정을 정적변수로 하고 목적함수인 충격에 대한 반력이 최소가 되도록 최적설계를 수행하였다. 본 연구의 결과로는 직렬식 2자유도계 모델의 반력이 가장 작게 나타났으며 그 다음으로는 1자유도계 모델, 병렬식 2자유도계 모델의 순으로 나타났다. 스프링상수와 감쇠계수의 변화가 반력에 미치는 영향을 확인하였으며, 최적설계 결과 각 모델에 대한 반력이 최소가 되는 스프링상수와 감쇠계수를 구하였다. On this study, to develop the impact absorbing system for spreader, we operated the dynamic response for models three types consisting of spring and oil damper by the finite element analysis. Also, in the three types of impact absorbing system, we set the restricted stroke of piston to the static variables and the optimum design was operated to have the minimum value of the reaction force for the impact. As the result, the direct model of two degree of freedom system has lowest value, the model of one degree of freedom system has higher value than that and the parallel model of two degree of freedom system has the highest value. And we studied the effect that the change of spring constant and damping coefficient affect to the reaction force and as the result of the optimum design, we found that reaction force has the lowest value in the each of models.
서진(Jin Seo),홍도관(Do-kwan Hong),김동영(Dong-young Kim),한근조(Geun-jo Han),안찬우(Chao-woo Ahn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper deals with the stability estimation of centrifuge compared the natural frequency of cylinder and screw with the gear tooth passing frequency of three step planetary gear using finite element analysis. Also, this paper performed the analysis of strength for rotating speed and centrifugal force of cylinder and screw. This study expressed the campbell diagram using the tooth passing frequency and the natural frequency of cylinder by transmission error which is one of the exciting cause.
권용수(Chan-woo Ahn),홍도관(Yong-soo Kwon),김동영(Do-kwan Hong),한근조(Dong-young Kim),안찬우(Geun-Jo Han) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper deals with the buckling and vibration analysis of plate with a hole. As aspect ratio rises in design parameter, the buckling strength and the natural frequency of laminated composite plate decrease and as diameter of hole for width of plate rises, the buckling strength decrease but the natural frequency increase. Also this paper tried to realize the optimum ply-angle with maximum buckling strength and natural frequency of laminated composite plate.
안찬우,김동영,홍도관 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2
In a number of cases it appears expedient to install several absorbers of smaller masses instead of one. This may be due to the need to distribute the absorber's response along the construction, restrictions on the absorber's installation and transportation and other reasons. The application of multimass absorbers is not limited to protection from harmonic actions. The complete optimization of the absorber's parameters reduces to resonance amplitude. So, we studied characteristic of main vibration system and multi dynamic absorber's system for the optimal natural frequency ratio and damping ratio of multi dynamic absorber. Also we obtain the optimization of the multi dynamic vibration absorber's parameters using computer simulation for the damped main vibration system. In designing multi dynamic vibration absorber, we are presented for the optimum values of the mass, spring constant and damping coefficient of multi dynamic vibration absorbers.