• 제목/요약/키워드: gain schedule

검색결과 43건 처리시간 0.022초

The SPWM Fuzzy Controller for speed control of Induction Motor

  • Kamsri, T.;Riewruja, V.;Ukakimaparn, P.;Pongswatd, S.;Kummool, S.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.465-465
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    • 2000
  • The paper presents the fuzzy control technique to adjust the gain schedule in the fuzzy controller. The micro computer is designed to the fuzzy controller to execute the proportional gain with the data of the error and speed command. The gain schedule is the fuzzy set which execute based on the fuzzy rule. The gain schedule from the fuzzy controller is fed to the sinusoidal pulse width modulation (SPWM) inverter for control the response and speed of the induction motor. The induction motor coupling to the DC motor and tachogenerator which DC motor as a load. The test result of the fuzzy control technique in the open loop control, it provides a good response and in the closed loop control it can control speed in the any condition of load design

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이득 스케쥴을 이용한 항공기 자동조종장치의 구성 (The study of autopilot system with pre-designed gain schedule)

  • 장정순;박춘배
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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    • pp.613-618
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    • 1993
  • This paper presents the aircraft autopilot system with a pre-designed gain schedule. It is mainly consisted of the parameter estimation end the autopilot system design. For off-line parameter estimation, leastsquare methods are investigated. The design of a controller is done in frequenced domain using classical control method and it is designed to satisfy the predetermined requirement such as time constant and transient response. Finally, it is compared with a optimal regulator.

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Cost and Schedule Analysis of Highway Projects based on Project Types

  • Shrestha, Bandana;Shrestha, Pramen P.
    • 국제학술발표논문집
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    • The 9th International Conference on Construction Engineering and Project Management
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    • pp.50-56
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    • 2022
  • Change Orders generally impact cost and schedule performance of highway projects. However, highway projects that do not have any change orders also face cost growth and schedule delays. This study seeks to determine the cost and schedule performance of Texas DOT projects by collecting project data for 120 highway projects completed between 2016 to 2020. For the study, we selected project data that has zero or negative change orders which were then grouped and analyzed based on their Project Types i.e., maintenance works; structural works; restoration and rehabilitation works; and safety works. The study found that performance of Maintenance and Safety type projects had less cost and schedule growth among the data analyzed. Statistical tests also found that even though the projects have no change orders, Rehabilitation and Restoration type projects experienced significant schedule growth compared to others. However, the data did not show any significant cost and schedule growth for the projects when statistical tests were performed on overall data. The study concluded that highway projects are experiencing schedule growth even though the projects had no change orders. Results from the study can help planners, engineers, and administrators to gain better insight on how different types of highway projects are performing in terms of cost and schedule and eventually derive appropriate solutions to minimize cost and schedule growth in such projects.

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항공사 기단의 상태변화 시각화에 관한 연구 (A Study on the Visualization of an Airline's Fleet State Variation)

  • 이용화;이주환;이금진
    • 한국항공운항학회지
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    • 제29권2호
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    • pp.84-93
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    • 2021
  • Airline schedule is the most basic data for flight operations and has significant importance to an airline's management. It is crucial to know the airline's current schedule status in order to effectively manage the company and to be prepared for abnormal situations. In this study, machine learning techniques were applied to actual schedule data to examine the possibility of whether the airline's fleet state could be artificially learned without prior information. Given that the schedule is in categorical form, One Hot Encoding was applied and t-SNE was used to reduce the dimension of the data and visualize them to gain insights into the airline's overall fleet status. Interesting results were discovered from the experiments where the initial findings are expected to contribute to the fields of airline schedule health monitoring, anomaly detection, and disruption management.

Z축 운전구조를 갖는 선형 영구자석형 동기 전동기 운전제어에 관한 연구 (A study of control system on Permanent Magnet Linear Synchronous Motor with Z-axis operation structure)

  • 이진하;최철;박한웅;김철우
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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    • pp.654-658
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    • 2003
  • In this study a control system with variable gain schedule using real speed and moving direction is proposed to control a Permanent Magnet Linear Synchronous Motor (PMLSM) with Z-axis operation structure. The implementation of the controller is designed on the DSP TMS320C32 board. PMLSM is operated by using 4-point absolute positions profile with each velocity, acceleration and deceleration. The direction of the initial angle action for starting is set from the lower limit point to the upper limit point on PMLSM operation stroke. The effectiveness of a control system with variable gain schedule is demonstrated by some experimental results.

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제어입력 크기제한을 갖는 시스템에서 외란 응답 감소를 위한 이득 스케쥴 제어 - 안정화 제어 응용 (Gain Scheduled Control for Disturbance Attenuation of Systems with Bounded Control Input - Application to Stabilization Control)

  • 강민식
    • 한국정밀공학회지
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    • 제23권6호
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    • pp.88-95
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    • 2006
  • In this paper, the gain-scheduled control design proposed in the previous paper has been applied to a target tracking system. In such system, it is needed to attenuate disturbance effectively as long as control input satisfies the given constraint on its magnitude. The scheduled gains are derived in the framework of linear matrix inequality(LMI) optimization by means of the MatLab toolbox. Its effectiveness is verified along with the simulation results compared with the conventional optimum constant gain and the scheduled gain control with constant Q matrix cases.

제어입력 크기제한을 갖는 시스템에서 외란 응답 감소를 위한 이득 스케쥴 제어 - 이론 (Gain Scheduled Control for Disturbance Attenuation of Systems with Bounded Control Input - Theory)

  • 강민식
    • 한국정밀공학회지
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    • 제23권6호
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    • pp.81-87
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    • 2006
  • A new gain-scheduled control design is proposed to improve disturbance attenuation for systems with bounded control input. The state feedback controller is scheduled according to the proximity to the origin of the state of the plant. The controllers is derived in the framework of linear matrix inequality(LMI) optimization. This procedure yields a linear time varying control structure that allows higher gain and hence higher performance controllers as the state move closer to the origin. The main results give sufficient conditions for the satisfaction of a parameter-dependent performance measure, without violating the bounded control input condition.

선형 영구자석형 동기 전동기의 Fuzzy 기반 Self-Tuning PI 속도 제어기에 관한 연구 (A study of Self-Tuning PI Speed Controller Based on Fuzzy for Permanent Magnet Linear Synchronous Motor)

  • 이진하;최철;김철우
    • 전력전자학회논문지
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    • 제9권6호
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    • pp.602-611
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    • 2004
  • 본 논문에서는 속도 오차의 최소화와 안정된 응답 특성을 가진 선형 영구자석형 동기 전동기를 이용한 시스템을 구성하기 위해서 속도 오차와 속도 오차의 미분항을 입력 변수로 하고 PI 룩업-테이블(look up table)을 이용한 퍼지(fuzzy) 기반 자기동조(self-tuning) PI 속도 제어기를 제안 하였다. 부하가 변동되는 제어 환경이나 시스템에 비선형성 외란이 가해지는 경우, 고정된 최초의 이득 설정 또는 NC 공작기에서 사용되는 속도에 따른 가변이득 조절 방식만으로는 원하는 제어특성을 기대하기가 어렵다. 본 연구의 타당성을 검증하기 위해서 기존의 고정이득 방식 및 속도 변동량에 따른 가변이득 방식을 제안한 방식과 시뮬레이션 및 4상한 운전 실험을 통해 비교함으로써 제안된 방식이 기존의 방식들보다 안정되고 빠른 속도 응답특성을 가짐을 확인하였다.

SW 공학수준과 SW 프로젝트 납기성과와의 관계 (Evaluation on the Relationship between Software Engineering Level and Schedule Deviation in Software Development)

  • 김승권;고병선
    • 한국IT서비스학회지
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    • 제10권4호
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    • pp.191-204
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    • 2011
  • Recently, many software companies are trying to improve the software quality and project outcome with more costs and efforts in development time. In the software convergence and integration environments, it is required efforts to gain high quality of software. In other words, it is required to utilize software engineering knowledge and technology for higher software quality and better software project productivity. The Software development productivity can be varied by software process capability according to building a framework for software development, selection and use of appropriate technology, human resource management. Software process capability will influence software project outcome which is the general opinion. This study provides empirical evidence about software engineering efforts and investment approach to lead software project performance. We measured the software engineering efforts by SW engineering level and analyzed the corelation between software engineering level and schedule deviation. And, we verified that this performance is affected by the size of software company. As a result, software process capability is important to build a infrastructure and develop systematically software project. The higher software engineering level can lead to improved software project performance.