• 제목/요약/키워드: Turning-Control

검색결과 432건 처리시간 0.02초

음압을 이용한 선삭작업에서의 채터감시 및 제어 (Monitoring and Control of Turning Chatter using Sound Pressure)

  • 이성일
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1996년도 추계학술대회 논문
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    • pp.85-90
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    • 1996
  • In order to detect and suppress chatter in turning processes a stability control methodology was studied through manipulation of spindle speeds regarding to chatter frequencies. The chatter frequency was identified by monitoring and signal processing of sound pressure during turning on a lathe. The stability control methodology can select stable spindle speeds without knowing a prior knowledge of machine compliances and cutting dynamics. Teliability of the developed stability control methodology was verified through turning experiments on an engine lathe. Experimental results show that a microphone is an excellent sensor for chatter detection and control

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선삭가공에서 절삭력을 일정하게 유지하기 위한 적응제어 (Adaptive Control for Cutting Force Regulating in Turning Operation)

  • 노상현;김진락;김교형
    • 대한기계학회논문집
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    • 제17권1호
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    • pp.69-77
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    • 1993
  • 본 연구에서는 Koren과 Masory가 개발하여 적분제어기에 적용한 제어알고리즘 을, 제어기 반응속도를 향상시키기 위하여 비례적분제어기에 적용하는 방법을 제시하 고자 한다. 실험을 통하여 제어시스템을 모델링하고, 근궤적법을 이용하여 시스템을 안정하게 유지하기 위한 개회로 이득을 선정하며, 기존의 보통선반을 적응제어시스템 으로 개발하여 고정이득 비례적분제어기와 가변이득 비례적분제어기의 성능을 실험을 통하여 비교하고자 한다.

배분력 제어를 통한 미세축 선삭가공에 관한 연구 (Study on Fine-shaft in Turning for Thrust Force Control)

  • 김규태;김원일;김상현;김경환
    • 한국기계가공학회지
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    • 제11권6호
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    • pp.88-93
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    • 2012
  • In this study, Machining fine shaft was examined by Lathe. method is proposed to control the thrust force to 0. through relationship between the cutting depth and the thrust force in turning, fine-shaft of less than 0.1mm diameter in turning is confirmed experimentally. also we propose practical expression to control thrust force in turning Through to change the approach angle, optimal tool design would be possible in turning.

선삭에서 절삭 속도 제어를 통한 표면 거칠기 향상 (Improvement of Surface Roughness by the Cutting Speed Control for Turning Operation)

  • 최종환
    • 한국기계가공학회지
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    • 제7권2호
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    • pp.23-30
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    • 2008
  • As a basic machining process, turning is a widely used machining process in which a single-point cutting tool removes material from the surface of a rotating material. A common method of evaluating machining performance is to measure the surface roughness. In a turning operation, it is important to select cutting conditions for achieving high cutting performance. As a rule, cutting conditions can be classified into feed rate, depth of cut and insert radius. While cutting process even though cutting conditions are optimized, the average roughness can be deterioration due to wear of the cutting tool edge. In this study, the aim is to maintain the average roughness even though the cutting condition is irregularly changing within the predictable range due to the working environment. First, the surface roughness model influenced by cutting conditions is constructed based on the experimental results in a turning operation, Second, applying the sliding mode control theory to the turning operation model which is composed of the surface roughness model and the motor transfer function, the surface roughness is closed to the desired value. Finally, the effectiveness of this approach is demonstrated through the computer simulation.

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비-어파인 비선형 동특성을 갖는 무인 자율 이동 보트의 속도 제어를 위한 적응 퍼지 제어 계통 (An Adaptive Fuzzy Control System for the Speed Control of the Autonomous Surface Vehicle with Nonaffine Nonlinear Dynamics)

  • 박영환;이재경
    • 제어로봇시스템학회논문지
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    • 제18권1호
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    • pp.1-6
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    • 2012
  • In this paper, an adaptive fuzzy control system is proposed for the speed control of the ASV (Autonomous Surface Vehicle) with nonaffine nonlinear system dynamics. We consider the turning speed of the screw propeller to be the control input instead of thrust so that we do not have to know the exact function between turning speed and thrust. But in this case, the ASV becomes a nonaffine nonlinear system because thrust is a nonlinear function of the turning speed. To solve this problem, we propose a Takagi-Sugeno fuzzy-model-based control system and simulation studies are performed. Simulation results show the effectiveness of the proposed control scheme.

유압실린더 구동식 전도 수문의 실시간 모의시험기 개발 (Development of the Real-Time Simulator of a Turning-Type Sluice Gate Actuated by the Hydraulic Cylinder)

  • 이성래
    • 한국자동차공학회논문집
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    • 제14권4호
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    • pp.192-198
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    • 2006
  • The real-time simulator of a turning-type sluice gate actuated by the hydraulic cylinders is developed using a PC and a visual C++ program language. The real-time simulator receives the directional control valve signal selected by the operator using the mouse, updates the state variables of the turning-type sluice gate system responding to the control signal, and draws the moving figures of the sluice gate, cylinder, reserved water every drawing time on the PC monitor. Also, the operator can observe the sluice gate angle, cylinder force, cylinder pressures, and hydraulic power representing the operation of sluice gate system through the PC monitor every drawing time. The simulator can be a very useful tool to design and improve the turning-type sluice gate system.

선박 자동 항로추종 제어알고리즘에 관한 연구 (A Study on the Automatic Route Tracking Control of Ships)

  • 정경열
    • Journal of Advanced Marine Engineering and Technology
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    • 제22권6호
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    • pp.920-927
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    • 1998
  • This paper presents a synthetic control algorithm that generates the rudder command angle to track the optimal route which is composed of straight-lines among way-points with keeping a required error limit. The control algorithm comprises three main lgorithms that is a course-keeping algorithm that eliminates the yaw angle difference between optimal route and current route a track-keeping algorithm that tracks the optimal route among way-points and a turning-control algorithm that includes the generation of optimal turning routes and control method. The effectiveness of the proposed control algorithm is assured through computer simulation.

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슬라이딩 모드 제어기를 응용한 선삭공정 절삭력 제어 (Cutting Force Regulation in Turning Using Sliding Mode Control)

  • 박영빈;김종원
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 추계학술대회 논문집
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    • pp.605-609
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    • 1996
  • Continuous sliding mode control is applied to turning process for cutting force regulation. The highest feedrate compatible with the allowable cutting force is applied in rough cutting process such that maximum productivity is ensured and tool breakage is avoided. The programmed feedrate is overridden after the control algorithm is carried out. However, most CNC lathe manufacturers offer limited number of data bits far feedrate override, thus resulting in nonlinear behavior of the machine tools. Such nonlinearity brings “quantized” effect, and the optimal faedrate is rounded off before being fed into the CNC system. To compensate for this problem, continuous sliding mode control is applied. Conventional switching control law at a sliding surface is replaced by a smooth control interpolation in a selected boundary layer to avoid the excitation of high-frequency dynamics. Simulation results are presented in comparison with those obtained by applying adaptive control.

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퍼지이론을 이용한 선삭의 절삭력제어 (Cutting Force Control of Turning Process Using Fuzzy Theory)

  • 노상현;정선환;김교형
    • 대한기계학회논문집
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    • 제18권1호
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    • pp.113-120
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    • 1994
  • The dynamic characteristics of turning processes are complex, non-linear and time-varying. Consequently, the conventional techniques based on crisp mathematical model may not guarantee cutting force regulation. This paper presents a fuzzy controller which can regulate cutting force in turning process under varying cutting conditions. The fuzzy control rules are extablished from operator experience and expert knowledge about the process dynamics. Regulation which increases productivity and tool life is achieved by adjusting feedrate according to the variation of cutting conditions. The performance of the proposed controller is evaluated by cutting experiments in the converted conventional lathe. The results of experiments show that the proposed fuzzy controller has a good cutting force regulation capability in spite of the variation of cutting conditions.

선삭에서의 가공 표면 제어 (ENGINEERED SURFACE CONTROL IN TURNING PROCESS)

  • 홍민성
    • 한국생산제조학회지
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    • 제4권3호
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    • pp.48-57
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    • 1995
  • The feasibility of generating controller surface topographies in single-point conventional turning operations is investigated. First, a mathematical model of the surface generation process was developed. Second, in order to control the texture of the machined surface, a micro-positioning stage and the associated command generation software were designed and built. Experimental examples have shown that surface texture can be precisely controlled and is in good agrement with the theoretical predictions.

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