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朴日柱,陳鍾泰,尹漢翼 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-
The vibration problem of a two-dimensional rigid body system on a simple beam is studied. The rigid body system is supported by the suspension units with stiffness and damping, and it has constant velocity on a beam. The deformations of the beams is represented by their corresponding eigenfunction series. The Runge-Kutta method is used in numerical analysis. 1. Regardless of damping, as the speed reduces, the maximum deflection of rigid body system increases, and as the speed increases, the maximum deflection of rigid body system reduces. 2. As the speed reduces, the deflection of rigid body system decreaces at endpoint of the simple beam from C=0 to C=100 N·s/m. And in case of C=1700 N·s/m, the deflection of rigid body system at endpoint of the simple beam is smallest at midspeed 22.22 m/s. 3. In case of undamping(C=O), the maximum deflection of rigid body system is moved from midpoint to endpoint of the simple beam as the speed increases. 4. As the damping coefficient increases, the deflection of rigid body system increases very small at the initial portion of the simple beam, but the maximum deflection reduces. 5. As the damping coefficient increases, the maximum deflection of rigid body system is moved from endpoint to midpoint of the simple beam.
軸壓縮力을 받는 單純보 上에서 移動하는 剛體系의 動特性
유진석,윤한익 東義大學校 産業技術開發硏究所 1999 産業技術硏究誌 Vol.13 No.-
The dynamic behavior of a moving rigid body system with four constant velociries on a simple beam subjected to a compressive axial force is analyzed by a numerical method. The governing equation are derived with the aid of Lagrange's equation. These equations are solved by Runge-Kutta method. The velocity of a rigid body system, the damping coefficients and spring constants of the suspension unit and the compressive axial force on a simple beam have an important effect upon the dymanic behavior of a moving rigid body system. As the speed reduces, the maximum amplitude of rigid body system increases. And as the speed increases, the maximum amplitude of rigid body system reduces. As the velocity increases, the amplitude of rigid body system at end part of simple beam.
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.
金永秀,尹漢翼 東義大學校産業技術開發硏究所 1995 産業技術硏究誌 Vol.9 No.-
The stability of a Leipholz's column having a rotatory spring at the support and two concentrated masses, one at support and the other at its tip, is studied by numerical method. The moment of inertia of the concentrated mass at support increases the critical flutter load of this elastic system, whereas the moment of inertia of the concentrated mass at its tip decreases it. The rotatory spring at the support decreases the critical flutter load of this elastic system.
두 이동질량이 단순지지 유체유동 파이프의 동특성에 미치는 영향
윤한익,임순홍,유진석 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.8
A simply supported pipe conveying fluid and two moving masses upon it constitute this nitration system. The equation of motion is derived by using Lagrange's equation. The influence of the velocities of two moving masses, the distance between two moving masses, 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 with in its critical values of a simply supported pipe without moving masses upon It. Their coupling effects on the transverse vibration of a simply supported pipe are inspected too. As the velocity of two moving masses increases, the deflection of a simply supported pipe is increased and the frequency of transverse vibration of a simply supported pipe is not varied. In case of small distance between two masses, the maximum deflection of the pipe occur when the front mass arrive at midspan. Otherwise as the distance get larger, the position of the front masses where midspan deflection is maximum moves beyond the midpoint of a simply supported pipe. The deflection of a simply supported pipe is increased by coupling of the velocities of moving masses and fluid flow.
최용문,손종동,윤한익 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-
The coupled effect on natural frequencies of Rotor System is studies by transfer matrix method. The results of this study are summarized as follows; (1) In case of coupled longitudinal vibration with flexural vibration the coupled effect of longitudinal vibration were 11.76% in comparison with first natural frequency of flexural vibration, 10.44% in comparison with second natural frequency, 3.1% in comparison with third natural frequency and 4.25% in comparison with fourth natural frequency. (2) In case of coupled longitudinal vibration with torsional and flexural vibration the coupled effects were almost same above. (3) It is found that the coupled effect have an influence on the mode shapes of flexural vibration.
Leipholz 기둥의 自由端을 支持하는 竝進 스프링이 安定性에 미치는 영향
陳鐘泰,尹漢翼 東義大學校産業技術開發硏究所 1994 産業技術硏究誌 Vol.8 No.-
On the stability of clamped-free elastic rods subjected to a compressive uniformly distributed tangential follower force the influence of the translation spring at the free end have been studied by numerical methods. It is proved that as the constant of a spring supporting the free end is augumented the critical flutter loads of the above system decrease. Therefore, when an elastic rod subjected to an compressive uniformly distributed tangential follower force is analyzed and designed, the characteristics of spring supporting the free end is a very effective element for the stability of the rod.
固定端 의 스프링 상수 가 末端質量을 가진 Beck′s Column 의 安定性 에 미치는 영향
윤한익,김광식 대한기계학회 1985 대한기계학회논문집 Vol.9 No.5
본 논문에서는 전보의 연속으로서 말단질량이 부착된 기둥의 자유단에 압축 종동력이 작용하는 비보존적 탄성계의 불완전 고정단에 나타나는 스프링 특성의 영향 을 연구하였다. 고정단은 병진스프링과 회전스프링으로 구속되었고, 이들 스프링 상 수의 여러 값이 말단질량과 연성(coupling)되어 기둥의 안정성에 미치는 영향을 연구 하였다. 기둥의 전단변형과 회전관성의 영향을 고려하였으며, Hamilton's principle 로서 계의 운동방정식과 경계조건의 식을 유도하여 수치해석하였다. On the stability of the Beck's column with a tip mass, the influence of the characteristics of the springs at the fixed end of the column are studied. The equations of motion and boundary conditions of this system are established by using the Hamiton's principle. On the evaluation of the stability of the column, t he effect of the shear deformation and rotatory inertial is considered in calculation. For the maintenance of the stability of the column, it is proved that the constant of the translational spring at the fixed end must be very large while th magnitude of the constant of the rotational spring at the fixed end has no effect. When the constants of the springs at the fixed end are small, it is also proved that the influence of the moment of inertial of the tip mass on the stability of the column are decreased and for the translational spring the degree of the decrease is more and more. Therefore it is found that the characteristics of the springs at the fixed end are very effective elements for the stability of the column when the columns subjected to a compressive follower force are designed.