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박영필,김재원 연세대학교 대학원 1994 延世論叢 Vol.30 No.1
Abstract Recently, interests in fuzzy control theory have grown rapidly and a lots of industrial products implementing fuzzy control algorithm have made appearances. Therefore, as an example of fuzzy control theory implementation, position control of DC servo motor is carried out which is widely used in mechanical engineering field. In this paper, studies are performed as follows. 1) Finding out the characteristics of fuzzy control; 2) Comparing the results of fuzzy control with that of PD control.
끝단질량을 갖고 아접선력을 받는 외팔 수직기둥의 동적 안정성
박영필,류봉조,이규섭,김인성,Park, Young-Pil,Ryu, Bong-Jo,Lee, Gyu-Seop,Kim, In-Sung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.2
The dynamic behavior of elastic columns under the action of the subtangential force is studied in this paper. The subtangential force is the combination of the tip mass dead load and pure follower thrust. In this study, the tip mass is assumed to be a rigid body rather than a point mass. The equations of motion are derived based on the extended Hamilton's principle and the finite element method. Then the equations of motion are trasformed into a dimensionless form, and several parameters are identified. It is found that the critical subtangential force can be changed subtangentially by considering the parameters related to tip mass. It is also shown that the nonconservativeness of the applied force has a significant effect on the type of instability. The influence of the self-weight of the column on the variation of the critical force is also investigated.
不均一 質量分布를 갖는 Flexible Missile의 動的安定性에 關한 硏究
박영필,이재영 연세대학교 대학원 1982 延世論叢 Vol.19 No.1
Because of the large axial loads due to the thrust force and the inertia force of the vesicle mass, the elastic stability analysis of the f1exible missile is important for the dynamic analysis of the flying miesile. In this study, the stability behaviors of a missile with several concentrated masses and a multi-stage missile are analyzed for the various thrust forces subjected to a directional control. The stability behavior is studied by using the finite element technique, in conjunction with the unconstrained adjoint variational principle, and evaluated by the study of the eigenvalues.
박영필 연세대학교 산업기술연구소 1981 논문집 Vol.13 No.1
本 硏究에서는 軸對稱의 帶壓을 받는 圓型 시린더의 彈一塑性問題를 應力一變形率의 增分개념을 利用한 有限要素法을 使用하여 解析하였다. von Mises의 降伏理論과 Prandtl-Reuss의 흐름理論에 따르는 彈性-完全塑性材料로 이루어진 圓型 시린더에 軸對稱의 內帶壓과 外帶壓이 作用하는 경우 帶壓의 幅의 變化에 따르는 彈一塑성의 거동을 解析하였다. For solving the problems of elastic-plastic behavior of circular cylinders subjected to a localized axisymmetric band pressure, a finite element method of the incremental stress-strain relation is presented. For the analysis, elastic-perfectly-plastic material obeying the von Mises yield criterion and the P randtl-Reuss flow theory was used. Results were analyzed for the internal and external axisymmetric band pressure with various widths.
박영필 대한기계학회 1994 大韓機械學會誌 Vol.34 No.10
방진설계에 있어서 능동제어의 활용은 다음과 같은 사항을 염두에 두어야 한다. 1)제어대상에 대한 이해 2)제어목적의 선정 3)제어이온의 선정 4)능동직동기의 선정 및 개발 5)능동제어계의 구성 이상과 같은 과정을 통하여 능동제어계를 구성함으로써, 방진설계에 대한 능동제어를 실현하게 된다. 이 단계에서는 실상황에서의 적용 또한 아울러 검토되어야 한다.