• Title/Summary/Keyword: Feedback Type

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Development of the New Inverter Control System for TG Feedback a formula Control (P/M의 TG Feedback방식을 제어하기 위한 인버터 시스템 적용에 관한 연구)

  • Cho, Hyeon-Seob;Ryu, In-Ho;Min, Lin;Oh, Hun
    • Proceedings of the KIEE Conference
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    • 2002.07d
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    • pp.2493-2494
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    • 2002
  • In this paper new inverter control system for TG feedback a formula Control was developed. The motor control system with TG feedback controller as an effect of load disturbance, it is very difficult to guarantee the robustness of control system. The function of the implementation are TG feedback type, and temperature scheme. The Inverter Control System approach is based on master-slave control concept. To show validity of the developed new inverter control system, severial experiments are illustrated.

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Control of Inverted Pendulum Systems Using a State Observer (상태관측기를 이용한 도립진자 시스템의 제어)

  • Lee, Yun-Hyung;Ahn, Jong-Kap;Jin, Gang-Gyoo;So, Myung-Ok
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.4
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    • pp.462-467
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    • 2007
  • The design and synthesis of a state feedback controller assumes the feedback of all state variables of the system. However, some state variables are not physical quantifies so that sensors may not be available, or may be too expensive to measure. Hence, a state observer can be an alternative to estimate unmeasurable state variables. This paper therefore presents a scheme for state observer-based stabilization control of inverted pendulum systems. The feedback gain matrices of both the state feedback controller and the state observer are tuned by real-coded genetic algorithms(RCGAs) such that the given performance indices are minimized. The proposed method is demonstrated through simulations.

Development of the New Inverter Control System for TG Feedback a formula Control (TG Feedback 방식을 제어하기 위한 새로운 Inverter Control System 개발)

  • Cho, Hyeon-Seob;Ryu, Byoung-Sik;Ryu, In-Ho
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2437-2438
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    • 2001
  • In this paper new, inverter control system for TG feedback a formula Control was developed. The motor control system with TG feedback controller as an effect of load disturbance, it is very difficult to guarantee the robustness of control system. The function of the implementation are TG feedback type, and temperature scheme. The Inverter Control System approach is based on master-slave control concept. To show validity of the developed new inverter control system, severial experiments are illustrated.

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A multivariable controller design of 6 DOF motion simulator (6자유도 운동재현기의 다변수 제어기 설계)

  • 이호영;강지윤;이교일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.449-454
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    • 1994
  • The Stewart Platform is one example of a motion simulator which generater 6DOF motion in space by six actuators in parallel. The presented control methrol of 6DOF motion simulator is generally classified into two types, one is SISO and the other is MIMO control type. The SISO control can't compensate for external load variation and different dynamic behavior of 6DOF motion, trerefore this type don's control motion precisely. On the other hand, the MIMO control compensates for a interference of 6DOF motion because MIMO controller is designed with 6DOF motion simulator synamics. But MIMO control of motion simulator has a complexity of 6DOF displacement feedback, because in oder to obtain feedback value we must solve the forward kinematics using measurement of cylinder length or design a state estimator, unless measurement of 6DOF displacement is possible. In this paper, a multivariable controller using H .inf. optimal control theory is designed to consider a interference of 6DOF motion and to obtain robust,precise control of system. Also in order to solve the mentioned problem of MIMO control, this paper presents a modified MIMO control model which control 6DOF motion by using feedback of measurement od cylinder length.

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Effect of Online Collaborative Learning Strategies on Nursing Student Interaction Patterns, Task Performance and Learning Attitude in Web Based Team Learning Environments (웹 기반 원격교육에서 온라인 협력학습전략이 간호학전공 학습자의 소집단 상호작용 유형, 학습결과 및 학습태도에 미치는 효과)

  • Lee, Sun-Ock;Suh, Minhee
    • The Journal of Korean Academic Society of Nursing Education
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    • v.20 no.4
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    • pp.577-586
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    • 2014
  • Purpose: This study investigates patterns of small group interaction and examines the influence among graduate nursing students of online collaborative learning strategies on small group interaction patterns, task performance and learning attitude in web-based team learning environments. Method: To analyze patterns of small group interaction, group discussion dialogues were reviewed by two instructors. Groups were divided into two categories depending on the type of feedback given (passive or active). For task performance, evaluation of learning processes and numbers of postings were examined. Learning attitude toward group study and coursework were measured via scales. Results: Explorative interactions were still low among graduate nursing students. Among the students given active feedback, considerable individual variability in interaction frequency was revealed and some students did not show any specific type of interaction pattern. Whether given active or passive feedback, groups exhibited no significant differences in terms of task performance and learning attitude. Also, frequent group interaction was significantly related to greater task performance. Conclusion: Active feedback strategies should be modified to improve task performance and learning attitude among graduate nursing students.

Identification of saturation-type nonlinear feedback control systems

  • Yeping, Sun;Kasiwagi, Hiroshi
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10a
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    • pp.161-164
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    • 1996
  • The authors have recently proposed a new method for identifying Volterra kernels of nonlinear control systems by use of M-sequence and correlation technique. A specially chosen M-sequence is added to the nonlinear system to be identified, and the crosscorrelation function between the input and output is calculated. Then every crosssection of Volterra kernels up to 3rd order appears at a specified delay time point in the crosscorrelation. This method is applied to a saturation-type nonlinear feedback control system of mechanical-electrical servo system having torque saturation nonlinearity. Simulation experiments show that we can obtain Volterra kernels of saturation-type nonlinear system, and a good agreement is observed between the observed output and the calculated one from the measured Volterra kernels.

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Position Control of Ultra-Precision Machine Tool Post using Piezoelectric Material(1) (압전 재료를 이용한 초정밀 가공기용 공구 위치 제어(1))

  • 김승한;송하성;송재욱;김의중
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.162-166
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    • 1996
  • This paper presents a position control of ultra-precision machine tool post using piezoelectric material. A stack-type piezoelectric actuator Is employed in a hinge-type tool holder. An assumed linear transfer function of the practical nonlinear plant is established through the comparison of transfer functions and step responses in the experiments and the simulations. Several types of feedforward/feedback controllers are designed via computer simulations using the assumed linear transfer function. The position tracking control experiments are undertaken to show the control efficiency of each controller.

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Flexible Multibody Dynamic Model of a Maglev Vehicle Bogie (자기부상열차 대차 유연 다물체 모델)

  • Kim, Ki-Jung;Han, Hyung-Suk;Lee, Nam-Jin;Kim, Bong-Sub
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.1207-1212
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    • 2009
  • The flexible multibody dynamic model of an EMS-type Maglev vehicle is necessary in design stage to predict its behavior, load history and levitation performance. Especially in EMS-type Maglev vehicle, the body flexibility of its bogie with electromagnets affects the levitation performance because its feedback control system is more sensitive to vibration of bogie structure. The flexible multibody dynamic model of a 1/2 Maglev vehicle under test is presented. The basic modeling procedure is almost the same as in other applications. However, the feedback control system model unique in EMS-type maglev vehicle must be included in the model. With the model proposed in this study, the dynamic behavior, load history and levitation performance are more precisely predicted. This model could realize the virtual prototyping in EMS-type Maglev vehicle area.

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A Comparison between Wordless and Narrative Picture Book of Mother-Child Verbal Interaction Strategy and Type (글 없는 그림책과 이야기 그림책의 유아와 어머니의 언어적 상호작용 전략 및 유형 비교)

  • 한유진
    • Journal of the Korean Home Economics Association
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    • v.41 no.3
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    • pp.17-30
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    • 2003
  • The purpose of this study was to explore the difference mother-child verbal interaction between wordless and narrative picture book. Forty-two 4-year-old middle class children(21 girls and 21 boys) and their mothers were observed in their home. Major findings were as follows: 1) Mothers' verbal interaction strategies shows difference according to the genre of the book. Mothers used more descriptive statement, descriptive questions, inferential statements, evaluative statements and elaborative feedback when sharing the wordless book than the narrative book. 2) Children differently interact when reading picture books of different genres. Children used more descriptive statements, inferential statements and elaborative feedback. 3) Compared with the narrative picture boot mother and child engaged in more turn-taking when reading the wordless picture book. 4) While the proportion of collaborative type was higher when reading the wordless boot the proportion of passive type was higher when the narrative book.

The Effect of Force Feedback on Video Gamers' Performance (포스 피드백이 비디오 게이머들의 게임결과에 미치는 영향)

  • Jeong, Wooseob
    • Journal of the Korean BIBLIA Society for library and Information Science
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    • v.24 no.4
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    • pp.91-98
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    • 2013
  • The purpose of this study is to examine the effect of force feedback on video gamers' performance with two different types of game controllers, and to verify users' consistency on their perceptions of force feedback effect and their actual performances in video games. 42 qualified players' records on a driving video game were analyzed in this study. This study shows 1) the force feedback effect in video games depends on the type of game controllers, 2) there is inconsistency between gamers' perception on the force feedback effect and their actual performances with the force feedback effect, and 3) emotional pleasure (fun factor) plays a big role in gamers' performances.