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박명균,박세만,구본성 명지대학교 산업기술연구소 2006 産業技術硏究所論文集 Vol.25 No.-
Proto type vibrating machine was developed for reducing the fat of the human body. By using the commercial FEM package ANSYS and Pro-E, the dynamic model was developed and stress analysis was carried out and structure strength was investigated for structural stability. Finally optimized shape for machine structure was suggested.
박명균(Myung Kyun Park),박세만(SaeMahn Bahk) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are various methods to join mechanical structures together. They typically include welding, mechanical joints by bolts and other processes depending on specific needs. Analyses of joints in the mechanical structures are essential in understanding the dynamic characteristics of the structures. In this research an impulse technique<br/> is applies to investigate the dynamic behavior of joints produced by bolts. The length of overlap in the joints was varied as the number of the bolts in the joints was changed. Also, the torque applied to the bolts were adjusted. Resonance frequencies were determined for the joints to evaluate the relationship between the increase in the applied torque and the increase in the number of bolts used in the joints. The results have demonstrated that the resonance frequencies of the joints increase with the increasing torque.
박명균(Myung Kyun Park),박세만(Sae-Mahn Bahk) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To join structures together, various methods and processes are available including welding, riveting, bonding with industrial adhesives and fastening by bolts. Analyses of the common areas formed by joining between the structures are significant in that their results can provide critical information for understanding the dynamic behavior of the whole structure. The structural factors affecting the dynamic behavior of the joined structures are usually believed to be materials composing the bolts, bolt sizes and the number of bolts as well as the strength of applied torque and the extent of overlap between the structures joined together. This paper analyzes the impacts of the structural factors such as the bolt sizes, the extent of overlap and the materials composing the structures on the dynamic behavior of the joined structures.
충격기법을 이용한 샌드위치보에 내재된 점탄성 성질에 관한 연구
박명균,박세만,박상규,박응순 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
For a number of years it has been known that flexural vibrations in a plate can be damped by the application of a layer of viscoelastic material that is in turn constrained by a backing layer or foil. A common example is the damping tape currently used in aircraft. This paper presents a quantitative analysis of the damping effectiveness of such a constrained layer. As in the work of H. Oberst the damping is characterized by the loss factor η, which is the normalized imaginary part of the complex bending stiffness of the damped beam.
세라믹/ 金屬接合材의 界面組織과 接合强度에 關한 數値解析 및 實驗的 硏究
박명균,박세만,최영택,선동주 明知大學校 産業技術硏究所 1997 産業技術硏究所論文集 Vol.16 No.-
In this research, both computational and experimental studies are conducted to reveal mechanical natures of bondings and consequences of joining processes for metals and ceramic pairs. In the computational part of this research a FEM analysis was utilized to effectively evaluate stress fields around ceramic-metal interfaces. Special attentions were paid to consider the low yield strength of interlayer alloys(buffer alloys). For the experimental part the effectiveness of active brazing metal methods was investigated. For the test, four different types of ceramic-metal pairs are fabricated. All the ceramic-metal pairs are brazed in vacuum at 850℃, 900℃ and 950℃. Tensile tests were conducted on the fabricated ceramic-metal pairs to evaluate bond strength between ceramics and metals. The test results show temperature effects and increases in bond strengths which is largely due to the inserted buffer layers(Mo-Mn and Ni Layer).
朴明均,朴世蔓 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
To join structures together, various methods and processes are available including welding, riveting, bonding with industrial adhesives and fastening by bolts. The structural factors affecting the dynamic behavior of the joined structures are usually believed to be materials composing the bolts, bolt sizes and the number of bolts as well as the strength of applied torque and the extent of overlap between the structures joined together. This paper analyzes the impacts of the structural factors such as the bolt sizes, the extent of overlap and the materials composing the structures on the dynamic behavior of the joined structures In this research an impulse hammer technique is applies to investigate the dynamic behavior of joints produced by bolts. The results have demonstrated that the resonance frequencies of the joints increase with the increasing torque and decreasing overlap length and stiffness.