• Title/Summary/Keyword: 동해석

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Dynamic Analysis of Composite Satellite Antenna Structure for Sine Vibration Test (복합재료 위성안테나의 진동시험을 위한 구조 동해석)

  • ;;;;;Horst Stockburger
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.05a
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    • pp.119-122
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    • 2002
  • The vibration qualification test of satellite antenna is required to verify that there will be no structural damage due to the severe vibration caused by the launch of satellite. For the qualification test, reasonable test load condition needs to be introduced by dynamic analysis. The present work has been performed to provide an understanding how the qualification test load can be evaluated by the results of both normal mode and sine vibration analyses with notching technique for a composite Ka-band antenna structure.

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Structural Design of the Door Frame of a Microwave Oven to Decrease Its Twisting Deformation Using Dynamic Analysis (동해석을 이용한 전자레인지 도어 프레임의 비틀림 변형 저감 구조설계)

  • Lee Boo-Youn;Koo Jin-Young;Kim Won-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.8 s.185
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    • pp.145-153
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    • 2006
  • To minimize the possible leakage of microwave when one opens the door of a microwave oven during its operation, a structural design of the reinforcing brackets for the door frame is presented. Twisting deformation of the door frame resulting from a dynamic pulling force is analyzed by harmonic and transient response analyses. Several types of the reinforcing brackets weldable to the right flange of the door frame is taken into consideration, and their effects to the twisting deformation of the door frame are compared and evaluated. As a conclusion, a thick step-shaped bracket, which is welded to whole length of the right flange, is favorable.

Dynamic Analysis of a Rigid Body Travelling on the Rotating Shaft (회전축을 따라 이동하는 강체의 동해석)

  • Park, Yong-Suk;Hong, Sung-Chul
    • Proceedings of the KAIS Fall Conference
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    • 2009.05a
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    • pp.528-531
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    • 2009
  • 본 연구에서는 두 스프링으로 지지된 강체가 회전하는 Timoshenko 축을 따라 이동할 때, 그 계의 동적응답 특성을 해석하였다. 운동방정식은 Hamilton의 원리에 따라 유도되었다. 유도된 운동방정식을 이용하여 주요 설계 파라미터 변화에 따른 응답특성을 해석하였다. 해석시 설계파라미터를 무차원 변수화 하여 속도비, 질량비, 회전수비 등 그 변화에 따른 응답특성을 비교 분석하였다.

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Cam Profile Design of a Fuel Pump Using Dynamic Analysis (동해석을 이용한 연료펌프의 캠 형상 설계)

  • Kim Bong-Ho;Lee Boo-Youn;Kim Won-Jin
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.1
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    • pp.58-64
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    • 2006
  • This work focuses on reducing the noise and vibration levels of an LPi fuel pump, which are generated from the dynamic motions of pump elements and non-uniform flow of fuel. The noise and vibration levels increase as the revolution speed of the cam goes up. The fuel pump consists of five cavity cells, plungers and diaphragms, which are driven by the cam. The optimal design of the cam profile is performed to decrease the accelerations of moving Parts and to obtain a smooth hydraulic force through a dynamic analysis of a cam-plunger mechanism. The cam-Plunger with a cavity is modeled as a 2 degrees of freedom system having non-linear contacts, the cam profile being represented in terms of Fourier series in order to determine the optimal shape of the cam. From the optimized cam Profile, the acceleration of the diaphragm is reduced in $78\%$, the hydraulic force becoming smoother in case that the hydraulic force is rapidly dropped.

Discrete element analysis for design modification of leveling blade on motor grader vehicle (모터 그레이더 평탄작업용 블레이드의 설계개선을 위한 개별요소법 해석)

  • Song, Chang-Heon;Oh, Joo-Young;Cho, Jung-Woo;Kim, Mun-Gyu;Seok, Jeong-Ho
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.23 no.6
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    • pp.423-438
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    • 2021
  • The blade of motor grader is used for scattering and leveling the aggregates on the foundation of road construction site. The paper performed a design improvement research of the blade part to enhance the working efficiency of motor graders. The scattering works of aggregates by blade driving were simulated by DEM (discrete element method) of a dynamic code. The four design parameters were selected and a specific leveling scenario for the simulation was determined. The nine blade models were numerically experimented, and the sensitivity of each factors was analyzed. Next, the design factors that influence a blade performance have been selected by ANOVA, and these key design factors were applied to the progressive quadratic response surface method (PQRSM). The optimum set of design factors of the blade was finally proposed.

Degree of saturation of $(CaCO_3)$ in the East Sea (동해의 탄산칼슘$(CaCO_3)$ 포화도)

  • Kang, Dong-Jin;Kim, Kyung-Ryul;Lee, Kyung-Eun
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.6 no.4
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    • pp.234-241
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    • 2001
  • The degree of saturation of calcium carbonate in the East Sea was calculated from the data obtained from'99 expedition using R/V Roger Revelle. The calcium concentrations in seawaters were estimated from salinity data, and the carbonate ion concentrations were calculated from total alkalinity and pH data. The results suggest that the crossover from the supersaturation to undersaturation for calcium carbonate occur at the depth of approximately 200-400 m for calcite, and 100-300 m for aragonite. Compared to the Pacific and Atlantic oceans, these levels in the East Sea are shallow due to most likely lower temperature of sea water in this region.

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