본 연구에서는 각종 큐브위성 미션에 사용되는 테이프 스프링 힌지의 거동해석을 수행하였다. 테이프 스프링 힌지는 곡선 단면을 갖는 직선형의 얇은 스트립이며 곡률을 따라 방향성을 가지는 특성 때문에 비선형성이 강하게 발생한다. 정확한 회전-모멘트 선도 예측을 목적으로 Edison 프로그램을 통한 수치 해석을 진행하였다. 통계적 모형을 통해 최적화 변수를 예측하고 수치 해석 결과를 비교해 검증하였으며, 더 높은 정확도를 위해 향후 연구 방향을 제시하였다.

There are different kinds of aircrafts, such as conventional airplane, rotorcraft, fighter, and umanned aerial vehicle. Their shape and feature are dependent upon their assigned mission. One of the fundamental analyses during the design of the aircraft is the structural analysis. The structural analysis becomes more complicated and needs more computations because of the on going complex aircrafts' structure. In order for efficency in the structural analysis, a simplified approach, such as equivalent beam or plate model, is preferred . However, it is not clear which analysis will be appropriate to analyze the realistic configuration, i.e, an equivalent beam or plate analysis for an aircraft wing. It is necessary to assess the boundary between the one dimensional beam analysis and the two dimensional plate theory for an accurate structural analysis. Thus, in this paper, the static structural analysis results obtained by EDISON solvers were compared with the three dimesional results obtained from MSC NASTRAN. Before that, EDISON program was verfied by comparing the results with those from MSC NASTRAN program and analytic solution.

처음 에디슨 경진대회를 준비할 때 업로드 되어 있는 다양한 프로그램을 보면서 어떤 주제를 선정할 지 고민을 하던중, 눈에 들어온 프로그램은 서울대학교에서 제작한 Co-rotational Plane beam-Dynamic tip load이란 프로그램이었다. 위 프로그램은 한쪽 단이 고정된 외팔보(cantilever beam)의 끝단에 하중을 시간에 관련된 함수(sin, cos)로 주어 각 절점에서의 변위(X, Y), 속도 그리고 가속도를 알려주는 프로그램이다. 우리는 이 프로그램을 이용해서 외팔보 끝단의 진동 형태와 주기가 어떤 요인(단면의 모양, 재료의 성질, 가하는 하중의 진동수 등)에 의해서 변하는지 분석할 수 있었다. 거기서 더 나아가 하중을 실제 지진상황에서의 크기와 유사하게 주고 위 프로그램에서의 보의 거동(진동 주기, 진동 변위 등)을 건물의 거동이라 가정했을 때 면진 주기를 얼마로 설정해야하는지도 알 수 있었다.

In this paper, Timoshenko and Euler-Bernoulli beam theories (EB-beam)are used, and Fast Fourier Transformation(FFT) analysis is then employed to extract their natural frequencies using both analytical approach and co-rotational plane beam(CR-beam) EDISON program. EB-beam is used to analyze a spring mass system with a single degree of freedom. Sinusoidal force with various frequencies and constant magnitude are applied to tip of each beam. After the oscillatory tip response is observed in EB-beam, it decreases and finally converges to the so called 'steady state'. The decreasing rate of the tip deflection with respect to time is reduced when the forcing frequency is increased . Although the tip deflection is found to be independent of the excitation frequency, it turns out that time to reach the steady state response is dependent on the forcing frequency.

In this paper, to examine the difference between the linear and non linear static, dynamic analysis for a structure, a cantilevered beam was used. Then, an external transverse static and dynamic loads were applied at the free end of the beam. Classical theories were used for the linear analysis and the EDISON CSD solver, co-rotational dynamic FEM program, was used for nonlinear analysis. In the static analysis, effects of the load for the beam deflection were observed in the linear and nonlinear analysis. Then, normalized displacement of tip of the beam was predicted for different frequency ration and a significant difference was obtatined in the vicinity of the resonant frequency. In addition, effects of frequency and time for the beam deflection were investigated to find the frequency delay.