鋼材 및 鋼板淸淨工程에 對한 考察

車一男 서울産業大學校 1981 논문집 Vol.15 No.1

In this paper, author investigated which process is better than Shot Blasting and pickling for cleaning of hot roll steel products. To induce the results, author first compared with the pickling process and the Shot blasting process theoritically. and than investigated the speciality and productivity of each process. The results are as follows: 1. The Blasting method is more economic and productive than the pickling method. 2. But, blasting method couldn't cover the all area of hot roll steel cleaning. For Example, Blasting method couldn't get the surface texture that is better than Ra 20μ. 3. For the efficient cleaning, It brings good result to use combining the pickling and the blasting method.

族削 加工面의 變形에 關한 切削모델에 對한 研究

車一男(IL Nam Cha),金潤濟(Yoon Jeh Kim) Korean Society for Precision Engineering 1988 한국정밀공학회지 Vol.5 No.1

Grid法에 依한 旋削 加工面의 変形에 關한 研究

車一男(IL Nam Cha),金潤濟(Yoon Jeh Kim) Korean Society for Precision Engineering 1986 한국정밀공학회지 Vol.3 No.4

압전세라믹 작동기를 이용한 유연그리퍼의 힘 추적제어

박용군,차일남 서울産業大學校 1996 논문집 Vol.44 No.1

본 논문은 압전세라믹 액튜에이터를 이용한 유연 그리퍼의 힘 추적제어에 관한 것이다. 먼저, 해밀돈 법칙을 이용하여 제안된 그리퍼 시스템의 운동지배 방정식을 유도한 후, 모달해석을 통해 주파수 변동의 불확실 인자가 포함된 상태공간 제어모델식을 도출하였다. 제어기로서는 시스템 불확실성에 강건한 슬라이딩 모드 제어기를 도입하였고, 완전차수 관측시를 이용하여 선단의 힘 센서 신호를 통해 시스템의 상태변수들을 추정하였다. 실험적 구현과 시뮬레이션을 통해 정현파와 계단파의 요구함에 대한 유연 그리퍼 선단에서의 힘 추적제어를 실시하여 바람직한 추적성능을 얻었다. 연구결과를 통해, 향후 본 논문에서 제시된 함추적 방법론을 로봇의 소형 그리퍼에 효과적으로 적용할 수 있음을 입증하였다. This paper provides a robust tracking control on tip force of a flexible gripper via piezoceramic actuator. Firstly, a dynamic governing equation for the proposed gripper is derived by employing Hamilton`s principle. A control model including uncertain system parameters such s natural frequency variations is then obtained via modal analysis. In addition, a sliding mode controller inherently robust to system uncertainties is adopted to carry out a tracking control for tip forces of the gripper. With the aid of sensor output information on tip forces, a full-order observer is formulated to estimate state variable of the gripper system. Finally, both simulation and experimental implementation are undertaken to evaluate tracking performances for desired force trajectories such as sinusoidal and step functions. The results explicitly exhibit that the proposed methodology is very effective in the robot gripper.

석유액화가스 엔진의 운전영역 따른 공연비 제어

심한섭,차일남 서울産業大學校 1998 논문집 Vol.47 No.1

Since the LPG has higher octane number and lower maximum combustion temperature than gasoline, the LPG engine work in many other operating range, analysis the operating range preciously and provides reducing method of emission for the LPG engine. An electronic control unit(ECU) for the LPG engine using a feedback mixer is presented. A PI-controller is implemented in the ECU in order to handle air/fuel ratio control. The experimental result exhibit the required engine performance are satisfied in the each operating range.

덕트계 음장 모델링에 의한 능동 소음 제어에 관한 연구

차일남,이태연 서울産業大學校 1992 논문집 Vol.35 No.1

In many years, active noise control in a long duct have mainly been studied. Active noise control in long duct system deal with plane wave propagation at low frequency using adaptive filtering techniques. In most of these studies, the acoustic properties such as reflections and resonances inside the acoustic system have rarely been studied. In this paper, the modeling method of active noise control system using a fixed FIR filter for short-length rectangular duct was proposed. The acceptable attenuation on the real acoustic system and stability of the controller are predicted in this computational simulation.

전기유동유체와 압전필름을 이용한 스마트 구조물의 능동 진동제어

박용군,차일남 서울産業大學校 1996 논문집 Vol.43 No.1

본 논문에서는 전기유동유체와 압전필름 액튜에이터를 특징으로 하는 하이브리드형 스마트 구조물에 대한 능동 진동제어를 실시하였다. 먼저, 가운데가 빈 샌드위치형태의 복합재료 구조물속에 전기유동유체를 삽입하고 또한 구조물 표면에는 압전필름을 접착하여 스마트 구조물을 제작하였다. 그리고, 전기유동유체에 대해서는 전기장함수의 주파수응답을 특징으로 하는 제어알고리즘을, 압전필름에 대해서는 신경회로망 제어기를 도출하였다. 이 두가지 액튜에이터를 개별적으로 적용하였을 때와, 동시에 적용하였을 때의 능동 진동제어 성능을 과도진동과 강제진동 하에서 고찰하여, 제시된 능동 진동제어 방법론의 타당성을 입증하였다. This paper provides a proof-of-concept investigation on an active vibration control of a hybrid smart structure (HSS) consisting of an electrorheological fluid actuator (ERFA) and a piezoelectric film actuator (PFA). Firstly, an HSS beam is constructed by inserting a starch-based electrorheological fluid into a hollow composite beam and bonding piezoelectric films on the surfaces of the structure, respectively. The control scheme for the ERFA is developed as a function of excitation frequencies on the basis of field-dependent frequency responses On the other hand, as for the PFA, a neuro-sliding mode controller (NSC) incorporating neural networks with the concept of sliding mode control is formulated. An experimental implementation for both the ERFA and the PFA is forced vibrations. Both the increment of damping ratios and the suppression of tip deflections are evaluated in order to demonstrate the control effectiveness of the ERFA, the PFA, and the hybrid actuation methodology. The experimental results exhibit a superior ability of the hybrid actuation system to tailor elastodynamic responses of the HSS rather than a single class of actuation system alone.

加工表面域에 生成되는 殘留應力에 對한 硏究Ⅰ

車一男 서울産業大學校 1988 논문집 Vol.28 No.1

This study is to investigate the distribution of residual stress on the subsurface of the machining area. The operation was carry out within the range of normal working condition such as feed and cutting speeds. Turning operation was carry out orthogonal cutting condition on carbon alloy steel (SCM 4). The results are as follows. 1) It can be seen that in all cases the residual stress generate at the beneath of surface, it is increased to the maximum residual stress and then decreased. The maximum residual stress was located 4-25 un depth from the machining surface. 2) As the cutting speed increased maximum residual stress was increased to the certain speed (80-120 m/min) and then decreased. 3) As the feed rate increased, maximum residual stress also increased, the depth of maximum residual stress layer was deeper from the machining surfaces.

신경회로망 제어기를 이용한 스마트 구조물의 능동 진동제어

박용군,차일남 서울産業大學校 1995 논문집 Vol.42 No.1

본 논문에서는 압전필름을 특징으로 하는 스마트 구조물의 동적 모델링과 능동 진동제어를 수행하였다. 먼저, 압전필름을 복합재료판의 상하면에 각각 액튜에이터와 센서로 부착하여 스마트 구조물을 제작하였다. 그리고 동적 모델링을 압전필름의 액튜에이팅 특성과 구조물의 에너지를 적용하여 실시한 후, 신경망회로와 슬라딩모드 제어 개념을 연계한 신경 슬라이딩모드 제어기를 제안하였다. 한편, 시물레이션과 실험적 구현을 통해 과도진동과 강제진동에 대한 능동 진동제어를 수행하여 제시된 동적 모델링과 제어방법론의 타당성을 입증하였다. This paper presents dynamic modeling and vibration control of smart structures featuring piezoelectric films(PFs). A smart structure is firstly constructed by perfectly bonding two PFs on the upper and lower surfaces of host material structures (glass/epoxy) as an actuator and a sensor, respectively. Adoption Hamilton's principle with PF actuating dynamics, a governing equation for the lateral motion and associated boundary conditions are obtained. Furthermore, a neural network controller so called neuro-sliding mode controller(NSC) is fabricated to perform vibration control of the smart structure. The effectiveness of the methodology on dynamic model and control strategy is demonstrated by achieving vibration performances through numerical simulations and experimental implementations in both the transient and forced vibrations.

3차원 밀폐 음장에서의 능동소음제어에 관한 연구

차일남,이태연 서울産業大學校 1993 논문집 Vol.38 No.1

A computer simulation is performed on the effectiveness of the active minimization of harmonically excited enclosed sound fields for producing global reduction in the amplitude of the pressure fluctuations. In this study for the appreciable reductions in total time averaged acoustic potential energy, ???, the transfer location strategies for three dimensional active noise control is presented based on the approximation in the total time averaged acoustic potential energy. In this study, the above theoretical basis is used to investigate the application of active control to sound fields of low modal density. By the use of room-like 3-dimensional rectangular enclosure it is demonstrated that the reductions in ???, can be achieved by using a single secondary source, provided that the source is placed within the half a wavelengths from the primary source and placed away from nodal line of the sound field. Concerning the reduction in ??? by minimizing the pressure in sound fields by the use of 3-dimensional rectangular enclosure, the effects of the number of sensors and the locations of these sensors are investigated. When a few models dominate the response it is found that if only a limited number of sensors are located away from nodal line and located at the pressure maxima of the sound field such as at each corner of a rectangular enclosure.