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RISS 인기검색어
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- 주제어 : aerodynamic stiffness (검색결과 5 건)
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김태균(Taekyun Kim),임우철(Woochul Lim),이태희(Tae Hee Lee) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.9
경기력 향상을 위한 자전거 프레임을 제작하기 위하여 주행 시 자전거 프레임에 발생하는 항력을 고려한 공기역학적 설계가 필요하다. 이를 위해 국제 사이클연맹 규격에 맞추어 초기 프레임을 설계 및 제작을 하였고 프레임에 발생하는 항력을 정량적 척도로 판단하기 위하여 항력계수를 이용하였다. 자전거 프레임의 공기저항을 최소화하기 위해 프레임 단면의 파라미터 설계를 실시하여 최적의 프레임의 형상을 도출하였다. 또한 자전거 프레임은 주행 시 선수에 의한 하중을 견딜 수 있어야 한다. 구조적인 측면에서 안정성을 갖춘 프레임을 제작하기 위하여 국제 사이클 연맹규격에서 제시하는 하중조건을 근거로 프레임의 강성을 평가하였고 이를 통해 선수용 자전거 프레임을 개발하였다. To improve cycling performance, the power output of the rider and the sources of resistance (e.g., air resistance, frame stiffness, and cycle mass) must be considered. From a mechanical viewpoint, we consider how the bike frame performance can be increased while decreasing the resistance. First, to improve the competitive ability of a racing track cycle, we should consider the stiffness of the bike frame including the pedal loading and aerodynamic effects when riding. Therefore, we obtained the cross-sectional area of each part of the bike frame and then aimed to minimize the drag force through an aerodynamic parametric study. In addition, the frame should remain safe under the loading applied by the rider. Under the guidelines of the UCI (union Cycliste Internationale) regulations, the bike frame has been evaluated under the proposed loading condition, and we developed a racing track cycle for elite cyclists.
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김남철(Namcheol Kim),이정호(Jeongho Lee),이승목(Seungmok Lee),조영익(Youngik Joe) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
A spoiler is one of most important factors for secure Aerodynamic performance and recently is not any more option part for MPV/SUV/Hatchback, by reducing strength of rear wake zone and optimizing flow separation of a roof end to prevent increasing drag. Until now, Blow method in mold has been seen as a typical one for spoiler. But, most of automobile companies use the Injection type for reduction of cost and weight and for getting more complicated design. In this study, we can set a standard of engineering design in optimized position and distance between mounting hardware and in evaluating the stiffness for opened shaped spoiler as well as large sized exterior parts with high stiffness material and see the higher quality of it with panel and other parts than blow method typed one.
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Wang, Lei,Liang, Shuguo,Song, Jie,Wang, Shuliang Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.21 No.5
To study the vibration frequency of super high-rise buildings in the process of vortex induced vibration (VIV), wind tunnel tests of multi-degree-of-freedom (MDOF) aero-elastic models were carried out to measure the vibration frequency of the system directly. The effects of structural damping, wind field category, mass density, reduced wind velocity ($V_r$), as well as VIV displacement on the VIV frequency were investigated systematically. It was found that the frequency drift phenomenon cannot be ignored when the building is very high and flexible. When $V_r$ is less than 8, the drift magnitude of the frequency is typically positive. When $V_r$ is close to the critical wind velocity of resonance, the frequency drift magnitude becomes negative and reaches a minimum at the critical wind velocity. When $V_r$ is larger than12, the frequency drift magnitude almost maintains a stable value that is slightly smaller than the fundamental frequency of the aero-elastic model. Furthermore, the vibration frequency does not lock in the vortex shedding frequency completely, and it can even be significantly modified by the vortex shedding frequency when the reduced wind velocity is close to 10.5.
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Lei Wang,Shuguo Liang,Jie Song,Shuliang Wang 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.21 No.5
To study the vibration frequency of super high-rise buildings in the process of vortex induced vibration (VIV), wind tunnel tests of multi-degree-of-freedom (MDOF) aero-elastic models were carried out to measure the vibration frequency of the system directly. The effects of structural damping, wind field category, mass density, reduced wind velocity (Vr), as well as VIV displacement on the VIV frequency were investigated systematically. It was found that the frequency drift phenomenon cannot be ignored when the building is very high and flexible. When Vr is less than 8, the drift magnitude of the frequency is typically positive. When Vr is close to the critical wind velocity of resonance, the frequency drift magnitude becomes negative and reaches a minimum at the critical wind velocity. When Vr is larger than12, the frequency drift magnitude almost maintains a stable value that is slightly smaller than the fundamental frequency of the aero-elastic model. Furthermore, the vibration frequency does not lock in the vortex shedding frequency completely, and it can even be significantly modified by the vortex shedding frequency when the reduced wind velocity is close to 10.5.
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The future role of smart structure systems in modern aircraft
Becker, J.,Luber, W.,Simpson, J.,Dittrich, K. Techno-Press 2005 Smart Structures and Systems, An International Jou Vol.1 No.2
The paper intends to summarize some guidelines for future smart structure system application in military aircraft. This preview of system integration is based upon a review on approximately one and a half decades of application oriented aerospace related smart structures research. Achievements in the area of structural health monitoring, adaptive shape, adaptive load bearing devices and active vibration control have been reached, potentials have been identified, several feasibility studies have been performed and some smart technologies have been already implemented. However the realization of anticipated visions and previously initial timescales announced have been rather too optimistic. The current development shall be based on a more realistic basis including more emphasis on fundamental aircraft strength, stiffness, static and dynamic load and stability requirements of aircraft and interdisciplinary integration requirements and improvements of integrated actors, actuator systems and control systems including micro controllers.
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