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윤한익,임순홍,유진석,Yun, Han-Ik,Im, Sun-Hong,Yu, Jin-Seok 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.9
An analysis is presented on the stability of an elastic cantilever column subjected to a concentrated follower force as to the influence of the elastic restraint and a tip mass at the free end. The elastic restraint is formed by the rotatory springs. For this purpose, the governing equations and boundary conditions are derived by using Hamilton's principle, and the critical flutter loads and frequencies are obtained from the numerical evaluation of the eigenvalue functions of the considered system.
윤한익(Han-Ik Yoon),손인수(In-Soo Son),조정래(Jeong-Rae Cho) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper analyzes the rotating vibration characteristics of the flexible 2-link manipulator forming a SCARA robot. Especially, Task-space of the manipulator is considered in this vibration analysis. In many previous studies it is supposed that only the second link of the manipulator is flexible, but in this study both of the two links are flexible. The equation of motion considered the effect of tension, flexural, and tip-mass is derived by the Lagrange's equation. The end-effector and payload are modeled as a tip-mass of the cantilever beam. And elastic deformation is approximated using the assumed mode method. Through numerical study, it is shown that the axial direction deflection of link 1 is small when the task-space of link 1 is narrower than that of link 2 and the flexural deflection of link I is influenced largely by variation of the angular velocity of link I. The natural frequencies at I st mode according to the angular velocity of the cantilever beam are provided
윤한익(HAN-IK YOON) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.2
A simply supported pipe conveying fluid and a moving mass upon it constitute a vibrational system. The equation of motion is derived by using Lagrange's equation. The influence of the velocity and the inertia force of a moving mass and the velocities of fluid flow in the pipe have been studied on the dynamic behavior of a simply supported pipe by numerical method. The velocities of fluid flow are considered within its critical values of the simply supported pipe without a moving mass upon it. Their coupling effects on the transverse vibration of a simply supported pipe are inspected too. As the velocity of a moving mass increases, the deflection of midspan of a simply supported pipe conveying fluid is increased and the frequency of transverse vibration of the pipe is not varied. Increasing of the velocity of fluid flow makes the frequency of transverse vibration of the simply supported pipe conveying fluid decrease and the deflection of midspan of the pipe increase. The deflection of the simply supported pipe conveying fluid is increased by a coupling of the moving mass and the velocities of a moving mass and fluid flow.
윤한익(Han-Ik Yoon),손인수(In-Soo Son),안성진(Sung-Jin Ahn),안태수(Tae-Soo Ahn),김동진(Dong-Jin Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
In this paper a dynamic behavior(natural frequency) of a cracked simply supported pipe conveying fluid is presented. In addition, an analysis of the buckling instability of a cracked pipe conveying fluid subjected to a follower compressive load is presented. Based on the Euler-Bemouli beam theory, the equation of motion can be constructed by using the Lagrange's equation. The crack section is represented by a local flexibility matrix connecting two undamaged beam segments. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations.
윤한익(HAN-IK YOON),김영수(YOUNG-SOO KIM),김봉균(BONG-KYUN KIM),송재길(JAE-KIL SONG) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.1
The dynamic behavior of a moving elastic body system with three constant velocities on a simple beam with an axial load is analyzed by numerical method. A moving elastic body system is composed of an elastic body and a suspension unit with two unsprung masses. The governing equations are derived with an aid of Lagrange’s equation. These equation are solved by Runge-Kutta method. The damping coefficients a spring constants of the suspension unit, the forced circular frequency on a moving elastic body, the velocity of a moving elastic body system and the axial load on a simple beam have the important effects upon the dynamic behavior of a moving elastic body system. These effects are more important in the high modes of a simple beam.
노즐 경사각을 고려한 이동질량을 가진 유체이송 외팔 파이프의 동특성 해석
윤한익(HAN-IK YOON),손인수(IN-SOO SON),김현수(HYUN-SOO KIM),조정래(JEONG-RAE CHO) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.6
The vibrational system in this study consists of a cantilever pipe conveying fluid, the moving mass upon it, and an attached tip mass. The equation of motion is derived by using the Lagrange equation. The influences of the velocity and the velocities of fluid flow in the pipe have been studied on the dynamic behavior of a cantilever pipe using a numerical method. While the moving mass moves upon the cantilever pipe, the velocity of fluid flow and the nozzle angle increase; as a result, the tip displacement of the cantilever pipe, conveying fluid, is decreased. After the moving mass passes over the cantilever pipe, the tip displacement of the pipe is influenced by the potential energy of the cantilever pipe and the deflection of the pipe; this effect is the result of the moving mass and gravity. As the velocity of fluid flow and nozzle angle increases, the natural frequency of the system is decreased at the second mode and third mode, but it is increased at the first mode. As the moving mass increases, the natural frequency of the system is decreased at all modes.
윤한익(Yoon, Han-Ik),손인수(Son, In-Soo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.5
In this paper, we studied about the dynamic behavior of a cracked rotating cantilever beam. The influences of a rotating angular velocity, the crack depth and the crack position on the dynamic behavior of a cracked cantilever beam have been studied by the numerical method. The equation of motion is derived by using the Lagrange's equation. The cracked cantilever beam is modeled by the Euler-Bernoulli beam theory. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. The lateral tip-displacement and the axial tip-deflection of a rotating cantilever beam is more sensitive to the rotating angular velocity than the depth and position of crack. Totally, as the crack depth is increased, the natural frequency of a rotating cantilever beam is decreased in the first and second mode of vibration. When the crack depth is constant, the natural frequencies of a rotating cantilever beam are proportional to the rotating angular velocity in the each direction.
윤한익(Yoon, Han-Ik),손인수(Son, In-Soo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.5
In this paper, we studied about the effects of the rotating cantilever pipe conveying fluid with a moving mass. The influences of a rotating angular velocity, the velocity of fluid flow and moving mass on the dynamic behavior of a cantilever pipe have been studied by the numerical method. The equation of motion is derived by using the Lagrange's equation. The cantilever pipe is modeled by the Euler-Bernoulli beam theory. When the velocity of a moving mass is constant, the lateral tip-displacement of a cantilever pipe is proportional to the moving mass and the angular velocity. In the steady state, the lateral tip-displacement of a cantilever pipe is more sensitive to the velocity of fluid than the angular velocity, and the axial deflection of a cantilever pipe is more sensitive to the effect of a angular velocity. Totally, as the moving mass is increased, the frequency of a cantilever pipe is decreased in steady state.
이동질량과 크랙을 가진 단순지지 보의 동특성에 관한 연구
윤한익(HAN-IK YOON),손인수(IN-SOO SON),조정래(JEONG-RAE CHO) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.6
To determine the effect of transverse open crack on the dynamic behavior of simply-supported Euler-Bernoulli beam with the moving masses, an iterative modal analysis approach is developed. The influence of depth and position of the crack in the beam, on the dynamic behavior of the simply supported beam system, have been studied by numerical method. The cracked section is represented by a local flexibility matrix, connecting two undamaged beam segments that is, the crack is modeled as a rotational spring This flexibility matrix defines the relationship between the displacements and forces across the crack section, and is derived by applying a fundamental fracture mechanics theory. As the depth of the crack is increased, the mid-span deflection of the simply-supported beam, with the moving mass, is increased. The crack is positioned in the middle point of the pipe, and the mid-span deflection of the simply-supported pipe represents maximum deflection.