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갈영민(Young Min Gal),손인수(In Soo Son),윤한익(Han Ik Yoon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Corrosion of structures can make their actual lifetime shorter than that originally designed. Therefore. the investigation of relation between the vibration characteristics of structures with the corrosion. The purpose of this' study is to investigate a change of natural frequency of beam structure according to the effect of corrosion. The corrosion device was designed for the corrosion experiment. The modal tests were carried out to examine the change of vibration characteristics of corrosion beam. It had the corrosion period of 4 weeks.
경사종동력을 받는 크랙 외팔보의 안정성에 미치는 세장비의 영향
갈영민(Young-Min Gal),안성진(Sung-Jin Ahn),윤한익(Han-Ik Yoon),손인수(In-Soo Son) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this paper, the purpose is to investigate the stability and variation of natural frequency of a Timoshenko cantilever beam subjected to Subtangential follower force and tip mass. In addition, an analysis of the flutter instability(flutter critical follower force) of a cantilever beam as slenderness ratio is investigated. The governing differential equations of a Timoshenko beam subjected to an end tangential follower force is derived via Hamilton;s principle. The two coupled governing differential equations are reduced to one fourth order ordinary differential equation in terms of the flexural displacement. Finally, the influence of the slenderness ratio and tip mass on the critical follower force and the natural frequency of a Timoshenko beam are investigated.
종동력을 받는 보의 안정성에 미치는 크랙 및 세장비의 영향
갈영민(Young-Min Gal),안성진(Sung-Jin Ahn),윤한익(Han-Ik Yoon),손인수(In-Soo Son) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this paper, the purpose is to investigate the stability and variation of natural frequency of a Timoshenko cantilever beam subjected to Subtangential follower force and tip mass. In addition, an analysis of the flutter instability(flutter critical follower force) of a cantilever beam as slenderness ratio is investigated. The governing differential equations of a Timoshenko beam subjected to an end tangential follower force is derived via Hamilton;s principle. The two coupled governing differential equations are reduced to one fourth order ordinary differential equation in terms of the flexural displacement. Finally, the influence of the slenderness ratio and tip mass on the critical follower force and the natural frequency of a Timoshenko beam are investigated.
갈영민(Young Min Gal),백무진(Moo-Jin Baek),이두호(Dooho Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In this study, a finite element model of human middle ear has been developed. The FE model was verified by comparing the result with previous studies. The displacement transfer function of umbo and velocity transfer function of footplate were calculated for comparison. The geometric data of ossicles from micro CT was used in order to develop the middle ear FE model. A right side temporal bone of a Korean cadaver was used for micro CT. The 2-dimensional geometric data from the micro CT was transformed into 3-dimensional solid geometry of three ossicles such as malleus, incus and stapes and used for the finite element model of middle ear. The developed FE model includes three ossicles, tympanic membrane, ligaments and muscles. The sound transfer functions of the FE model shows good agreement with measured responses over 10 ㎑ frequency band. To identify sensitivities of middle ear function due to material property variation, several parameter studies have been fulfilled using the middle ear FE model. As a result the stiffness property of incudostapedial joint was the most influential to the middle ear sound transfer function among the parameters.
갈영민(Young Min Gal),백무진(Moo-Jin Baek),이두호(Dooho Lee) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.12
본 연구에서는 인간중이의 소리전달특성 계산을 위한 유한요소모델을 개발하였다. 이소골의 형상을 얻기 위하여 한국인 사체에서 추출한 측두골을 마이크로 CT 촬영하여 3 차원 입체모델로 변환하였다. 유한요소모델은 이소골, 고막, 인대와 근육 등을 포함하여 구성하였다. 유한요소모델을 이용하여 고막에서 등골족판까지의 응답함수를 계산한 후 측정값을 갖는 선행연구와 비교하였고 그 결과 10 ㎑ 주파수 대역까지 소리전달특성을 잘 표현하고 있음을 보였다. 또한 유한요소 모델을 구성하는 주요 물성인자의 변화에 대한 소리전달특성의 변화를 살피고 침등골관절의 강성값이 중이의 소리전달특성에 큰 영향을 미침을 보였다. In this study, we developed a finite element model of the human middle ear has been developed to calculate itsfor sound transfer characteristics calculation. We usedThe geometric data forof ossicles, obtained byfrom micro-CT scanning, was used in order to develop the middle- ear FE model. A right- side temporal bone of a Korean cadaver was used for the micro-CT scanning. The developed FE model includes three ossicles, the tympanic membrane, ligaments, and muscles. We calculated theA sound transfer function from the tympanic membrane to the stapes footplate was calculated. The sound transfer function calculated vias of the FE model shows good agreement with measured responses over the 10- ㎑ frequency band. To measureidentify the sensitivityies of the middle- ear function due to material property variation, we studied several parameters studies have been fulfilled using the middle ear FE model. TAs a result the stiffness property of the incudostapedial joint had the greatest influence onwas the most influential to the middle- ear sound transfer function. among the parameters.