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일정가속도(一定加速度)의 이동하중(移動荷重)과 축하중(軸荷重)이 작용(作用)하는 유한(有限)보의 동특성(動特性)
홍동표,Hong, Dong Pyo 대한토목학회 1982 대한토목학회논문집 Vol.2 No.3
일정가속도(一定加速度)의 이동하중(移動荷重)과 축하중(軸荷重)이 작용(作用)하는 탄성기초(彈性基礎)위에 지지(支持)된 유한(有限)보의 동특성(動特性)을 연구(硏究)하였다. Euler보 이론(理論)을 이용(利用)하여 공간좌표(空間座標)에 관(關)하여는 Fourier 변환(變換)을 하고 시간(時間)에 관(關)하여는 Laplace 변환(變換)을 하여 해(解)를 구(求)하였다. 이론해석(理論解析) 결과(結果)에 포함(包含)된 적분(積分)은 Simpson's Rule에 의하여 구(求)하였다. 이론해석(理論解析) 결과(結果)로부터 보의 동특성(動特性)은 가속도(加速度)와 축하중(軸荷重)에 의하여 크게 영향(影響)을 받는다는 것을 밝혔다. The dynamic behaviour of an elastically supported finite beam subjected to an axial force and moving loads with acceleration is investigated. Within the Euler beam theory the solutions are obtained by using finite Fourier and Laplace transformation methods with respect to space and time variable. Integrations involved in the theoretical results are carried out by Simpson's rule. From the results of the theoretical analysis, it is evident that dynamic behaviour of the beam are affected remarkably by acceleration and axial force.
홍동표(Dong-Pyo Hong),홍용(Yong Hong),왕고평(Gao-Ping Wang),김병진(Byung-Jin Kim),김영문(Young-moon Kim),이재정(Jae-Jung Lee),김재열(Jae-Yeol Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents a primary study for a new method of enhancing measurement using impedance analysis method, which is widely used for structure health monitoring. Many of skyscrapers, bridges, tunnels, which have been built up several years, and nearly reached their operating life due to aging crack, material deterioration, and so on. therefore, the health monitoring technique has obtained considerable attention. The goal of this research is to show basic information to evaluate structural health condition using piezoelectric sensors. The piezoelectric materials have various merits. It is easy to shape various forms and can be embedded on the materials more conveniently. Moreover, the excitation frequency can be changed and the piezoelectric sensors cost less. All these features make the piezoelectric-based system applicable to structural healthy monitoring. This work presents a study for the development of a practical and quantitative technique for assessment of the structural health condition by piezoelectric impedance-based technique associated with longitudinal wave propagation. To estimate the damage condition numerically, we suggest the evaluation method Cov (Covariance) and CC (Correlation Coefficient) in this paper.
홍동표(Dong-Pyo Hong),홍용(Yong-Hong),김현식(Hyun-Sik Kim),박현우(Hyun-Woo Park),왕고평(Gao-ping Wang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Carbon fiber epoxy composite and glass fiber epoxy composite have many advantage because of higher specific stiffness and specific strength. In this work, vibration characteristics of hybrid shaft used composite and aluminum is of high natural frequency. Carbon fiber epoxy composite layer on the inner surface of an aluminum tube more higher natural frequency than aluminum tube. From the experiments and FE analyses, the natural frequency was calculated by ANSYS and 01㏈ FFT analyzer, and a hybrid-shaft was found that the natural frequency is higher 13% more than natural frequency of aluminum-shaft.
이동하중(移動荷重)과 축하중(軸荷重)이 작용(作用)하는 유연(柔軟)한 기초(基礎)위에 지지(支持)된 무한(無限)보의 휨모멘트 특성(特性)
홍동표,김광식,Hong, Dong Pyo,Kim, Kwang Sic 대한토목학회 1982 대한토목학회논문집 Vol.2 No.3
이 연구(硏究)는 이동하중(移動荷重)과 축하중(軸荷重)이 작용(作用)하는 무한(無限)보에 휨모멘트를 해석(解析)하고 공진선도(共振線圖)를 나타낸다. 하중(荷重)과 함께 이동(移動)하는 좌표계(座標系)에서 정상해(定常解)를 구하였다. 지지(支持)된 기초(基礎)는 감쇠(減衰)를 포함하였고 축하중(軸荷重)과 감쇠(減衰)와 이동하중속도(移動荷重速度)가 보의 응답(應答)에 미치는 영향(影響)을 연구(硏究)하였다. 비감표(非減表)와 임계감표(臨界減表)의 경우에 대하여도 연구(硏究)하였다. 몇몇의 이동하중속도변수(移動荷重速度變數), 축하중변수(軸荷重變數), 감표변수(減表變數)에 따른 보의 휨모멘트 윤곽(輪廓)이 도표(圖表)로 나타내졌다. This paper presents analytic bending moment solution and resonance diagrams for a uniform beam of infinite length subjected to anaxial force and moving transverse load. Solutions are obtained that are time invariant in a coordinate system moving with the load velocity. The supporting foundation includes damping effects. The influences of the axial force, damping coefficient and load velocity on the beam response are studied. The limiting case of no damping and critial damping are also investigated. The profiles of the mement of the beam is shown graphically for several values of the load speed, the axial force and damping parameters.