• Title/Summary/Keyword: 제어이득

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Effect of Grating Phase in DFB Lasers with an Anti-reflection Coated Mirror (AR 코팅된 DFB 레이저에서 격자 위상의 영향)

  • Kwon, Kee-young;Ki, Jang-geun;Cho, Hyun-mook
    • The Journal of the Convergence on Culture Technology
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    • v.7 no.3
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    • pp.463-468
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    • 2021
  • In this paper, when a refractive index grating and a gain grating were simultaneously present in a DFB laser having a wavelength of 1.55 ㎛, a dielectric film coating was applied so that reflection did not occur on the right mirror surface, so that 𝜌r=0. In case of 𝛿L>0, the characteristics of the oscillation frequency and oscillation gain were analyzed. When the grating phase of the left mirror surface continues to decrease from 𝜋, the graph lines of each mode gradually shift to the left. In case of 𝜅L=10, the threshold gain of the oscillation mode is the lowest. In this case, the mode selectivity is relatively low. From 𝜅L=0.5 to 𝜅L=6, the mode selectivity and the frequency stability are excellent. In the case of DFB lasers with an anti-reflection coated mirror, the threshold gain of the oscillation mode increases but the mode selectivity is about twice as excellent, compared with DFB lasers of having two cleaved facets.

Optical ATM Cell Decompressor using Gain-transparent SOA Switch (이득-투명 SOA 스위치를 이용한 광 ATM 셀 역압축기)

  • 정광원;안상호;이정렬;이승우;엄진섭
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.7B
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    • pp.901-906
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    • 2001
  • 본 논문에서는 이득-투명 SOA 스위치를 이용한 새로운 구조의 광 셀 역압축기를 제안하였다. 제안된 구조는 하드웨어 및 제어의 단순화와 이득-투명 SOA를 이용함으로써 처리용량을 극대화하기 위한 요구조건을 만족시킨다. 제안된 구조의 동작을 실험으로 보이기 위해 4-비트의 소규모 광 압축셀을 역압축시키는 실험을 수행하였으며, 제안구조의 동작원리와 일치하는 결과를 얻을 수 있었다. 이는 시간분할 방식을 포함하는 광 ATM 교환기와 광 패킷망 등에 주요 요소로서 적용될 수 있다.

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A study on the Speed Control of SPMSM Using the Variable Gain (가변 Gain을 이용한 SPMSM의 속도제어에 관한 연구)

  • Lee J.H.;Jo U.K.;Kim C.U.
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.15-18
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    • 2004
  • 본 논문에서는 표면 부착형 영구자석형 동기 전동기(SPMSM)의 가감속과 부하 변동에 따른 속도 특성 향상을 위해 실제 속도와 부하 토크 관측기를 통한 부하 토크를 입력 변수로 설정하여 가변 이득 조절 알고리즘을 제안한다. 제안된 알고리즘을 증명하기 위해 여러 운전 조건에서 기존의 이득 시스템과 가변 이득 조절 시스템을 비교하여 제안된 알고리즘의 효용성을 검증하였다.

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3-phase current measurement synchronization and gain error correction method for high speed motor operation (고속 전동기 구동을 위한 3상 전류 측정 동기화 및 이득 오차 보정 방법)

  • Kim, Miseong;Lee, Wook-Jin
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.402-403
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    • 2019
  • 2개의 S/H (Sample and Hold)회로를 내장한 ADC (Analog to Digital converter)는 전동기의 3상 전류를 동시점에서 샘플링(sampling)할 수 없다. 또한 전류 센서 및 아날로그 신호처리 회로의 이득은 오차가 있다. 이러한 이유로 3상 측정 전류의 불평형 상태가 야기될 수 있으며 이 불평형은 전동기 전류제어에 영향을 미친다. 이 논문에서는 2개의 S/H 회로를 이용한 3상 전류 측정의 동기화 및 이득 오차의 보정 방법을 제안하고 컴퓨터 모의 실험을 통하여 제안된 방법을 검증하였다.

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

  • Lee Chin-Ha;Choi Cheol;Kim Cheul-U
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.6
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    • pp.602-611
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    • 2004
  • Servo system has commonly adapted PI controller with fixed gains, because of its simplicity and determinative relationship among the parameters. The fixed gains PI system may be applied well to some operation conditions, but not non-linearities, complex and time variant operation conditions. For solving these problems, another conventional method, 'variable gun schedule according to speed', is published. The value of gain is determined according to the absolute value of the mover real speed. In this paper, FSTPIC(Fuzzy Self-Tuning PI Controller) is proposed based on various experiences to rapidly reduce speed error and to secure a good speed response characteristics. The effectiveness of proposed algorithms is demonstrated by comparing to two conventional gain systems via 4-quadrant operation.

Pressure Control Law of Gas Generator Considering Combustion Volume Change (연소공간 변화를 보상하는 가스발생기 압력 제어기법)

  • Park, Ik-Soo;Lee, Jae-Yoon;Choi, Ho-Jin;Kim, Jung-Hoe;Yoon, Hyun-Gull;Lim, Jin-Shik
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.3
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    • pp.34-40
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    • 2012
  • A pressure control law to regulate pressure of gas generator is suggested. To design a model based control law, the governing equation which consists of Robert and conservation equation is built and verified through the ground burning test. PID and nonlinear adaptive control laws are designed to analyze the loop response characteristics under the system which has varying eigen properties arisen from combustion volume change. It is suggested that new approach, gain scheduling design, is required to overcome the defects identified from numerical simulation results of the two control laws. The newly suggested scheme shows good control performance even under disturbances and measurement noise.

Pressure control law of gas generator considering combustor volume change (연소공간 변화를 보상하는 가스발생기 압력 제어기법)

  • Park, Ik-Soo;Lee, Jae-Yoon;Choi, Ho-Jin;Park, Geun-Hong;Yoon, Hyun-Gull;Lim, Jin-Shik
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.618-623
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    • 2011
  • A pressure control law to regulate pressure of gas generator is suggested. To design a model based control law, the governing equation which is consisted of Robert and conservation equation is built and verified through the ground burning test. PID and nonlinear adaptive control laws are designed to evaluate the loop response characteristics under the system which has varying eigen properties as combustor volume is increased. It is suggested that new approach, gain scheduling design, is required to overcome the defects identified from numerical simulation results of the two control laws. The newly suggested scheme showed good control performance even under disturbances and measurement noise.

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Inverse Optimal Problem for Homing Guidance with Angular Constraint (충돌각 제어 호밍유도법칙의 역최적 문제)

  • Lee, Jin-Ik;Lee, Yong-In
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.5
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    • pp.412-418
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    • 2007
  • An inverse optimal problem for homing guidance with angular constraint is addressed. The gains of BPN(Biased PN) are investigated by duality analysis related to the weighting matrices of the performance index in the LQ control problem. Moreover, the criteria for the existence of optimal gains are derived from the generalized Riccati equation. Based on the conditions we achieve the gain set of BPN to be optimal solution to the LQ problem with terminal constraints. To validate and demonstrate the proposed approach 3-DOF simulations are carried out.

Identification and Control of Command Panoramic Sight System (조준경안정화시스템의 인식과 제어)

  • Kim, Dae-Woon;Cheon, Soon-Yong
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.44 no.3
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    • pp.14-21
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    • 2007
  • Sight Stabilization system is the control system to preserve Line of Sight for the targets though many nonlinear disturbances and vibrations are generated. In this paper, we identified Stabilization system using RLS algorithm, one of the system identification algorithm and found out the modeling of system. Considering nonlinear operational condition this paper proposes two Knowledge-base controllers - Fuzzy controller, Fuzzy PI Gain Scheduling controller, and simulates the performances of proposed controllers compare with Lead PI controller being used in Sight system of NFIV.

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

  • Kang Min-Sig
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.6 s.183
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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.