• Title/Summary/Keyword: 관측기 기반 고장검출

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Sampled-Data Fault Detection Observer Design of Takagi-Sugeno Fuzzy Systems (타카기-수게노 퍼지 시스템을 위한 샘플치 고장검출 관측기 설계)

  • Jee, Sung Chul;Lee, Ho Jae;Kim, Do Wan
    • Journal of the Korean Institute of Intelligent Systems
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    • v.23 no.1
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    • pp.65-71
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    • 2013
  • In this paper, we address fault detection observer design problem of T-S fuzzy systems with sensor fault. To detect fault, T-S fuzzy model-based observer is used. By introducing $\mathfrak{H}$_ performance index, an observer is designed as sensitive to fault as possible. The fault is then detected by a fault decision logic. The design conditions are derived in terms of linear matrix inequalities. An illustrative example is provided to verify the effectiveness of the proposed fault detection technique.

Desing of Fault Detection and Diagnosis systems using function observers (함수관측자 기반 고장검출진단시스템의 설계 및 응용)

  • Lee, Sang-Moon;Lee, Kee-Sang;Park, Tae-Geon
    • Proceedings of the KIEE Conference
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    • 2005.07d
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    • pp.2756-2758
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    • 2005
  • 본 논문에서는 제어시스템의 신뢰성 향상을 위한 고장허용제어계를 실현하기 위하여, 함수관측자를 도입한 장치고장검출(IFD)기법 및 고장보상알고리즘을 제안하고, 이를 전형적인 불안정 비선형시스템인 역진자제어계에 적용하였다. 제안된 IFDS는 기존의 다중관측자기법과 동일한 구조를 가지지만 최저차 설계가 가능한 미지입력 함수관측자를 채택함으로서 알고리즘의 단순화를 가하였을 뿐 아니라 고장량의 추정 등 다양한 설계목적을 고려하여 설계될 수 있다는 특징을 가진다. 제안된 고장 검출식별 기법의 제안된 역진자제어계를 위한 제어기, 고장검출식별 및 보상알고리즘을 모두 포함한 상태에서 고장허용제어의 가능성을 검증하였다.

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A Fault Detection System Design for Boiler-Turbine Control System of Thermal Power Pant (화력발전소 보일러-터빈 제어시스템의 고장검출시스템 설계)

  • Yoo, Seog-Hwan
    • Journal of the Korean Institute of Intelligent Systems
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    • v.25 no.6
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    • pp.615-620
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    • 2015
  • This paper deals with a fault detection system design for a boiler-turbine control system of thermal power plant. We described the nonlinear properties of the boiler-turbine dynamics as a T-S fuzzy system with time varying measurable parameters. We design a residual generator using an observer based fault detection filter. In order to identify the faulted output sensor, an approximate inverse system is connected to the outport of the fault detection filter. We demonstrate the efficiency of the suggested design method via computer simulations.

T—S Fuzzy Model-based Sampled-data Observer Design for Detecting Internal Oil Leakage in Single-rod Hydraulic Cylinder: LMI Approach (편로드 유압실린더 내부 누유 검출을 위한 T—S 퍼지 모델 기반 샘플치 관측기 설계: LMI 접근법)

  • Jee, Sung Chul;Kim, Hyogon;Park, Jeongwoo;Lee, Mun-Jik;Kang, Hyungjoo;Li, Ji-Hong
    • Journal of Ocean Engineering and Technology
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    • v.30 no.5
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    • pp.405-414
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    • 2016
  • This paper presents an internal oil leakage detection problem for a hydraulic single-rod cylinder. We derive the dynamics of the hydraulic cylinder as a state space model, and then design a T—S fuzzy model-based fault detection observer. We adopt an H observer design scheme so that the observer is robust against disturbance and relatively sensitive to the leakage fault. Sufficient design conditions are derived in the form of linear matrix inequalities. A numerical example is provided to verify the proposed techniques.

Active Fault Tolerant Control of Quadrotor Based on Multiple Sliding Surface Control Method (다중 슬라이딩 표면 제어 기법에 기반한 쿼드로터의 능동 결함 허용 제어)

  • Hwang, Nam-Eung;Kim, Byung-Soo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.1
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    • pp.59-70
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    • 2022
  • In this paper, we proposed an active fault tolerant control (AFTC) method for the position control of a quadrotor with complete loss of effectiveness of one motor. We obtained the dynamics of a quadrotor using Lagrangian equation without small angle assumption. For detecting the fault on a motor, we designed a fault detection module, which consists of the fault detection and diagnosis (FDD) module and the fault detection and isolation (FDI) module. For the FDD module, we designed a nonlinear observer that observes the states of a quadrotor based on the obtained dynamics. Using the observed states of a quadrotor, we designed residual signals and set the appropriate threshold values of residual signals to detect the fault. Also, we designed an FDI module to identify the fault location using the designed additional conditions. To make a quadrotor track the desired path after detecting the fault of a motor, we designed a fault tolerant controller based on the multiple sliding surface control (MSSC) technique. Finally, through simulations, we verified the effectiveness of the proposed AFTC method for a quadrotor with complete loss of effectiveness of one motor.

Sliding Mode Observer-based Fault Detection Algorithm for Steering Input of an All-Terrain Crane (슬라이딩 모드 관측기 기반 전지형 크레인의 조향입력 고장검출 알고리즘)

  • Oh, Kwangseok;Seo, Jaho
    • Journal of Drive and Control
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    • v.14 no.2
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    • pp.30-36
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    • 2017
  • This paper presents a sliding mode observer-based fault detection algorithm for steering inputs of an all-terrain crane. All-terrain cranes with multi-axles have several steering modes for various working purposes. Since steering angles at the other axles except the first wheel are controlled by using the information of steering angle at the first wheel, a reliable signal of the first axle's steering angle should be secured for the driving safety of cranes. For the fault detection of steering input signal, a simplified crane model-based sliding mode observer has been used. Using a sliding mode observer with an equivalent output injection signal that represents an actual fault signal, a fault signal in steering input was reconstructed. The road steering mode of the crane's steering system was used to conduct performance evaluations of a proposed algorithm, and an arbitrary fault signal was applied to the steering angle at the first wheel. Since the road steering mode has different steering strategies according to different speed intervals, performance evaluations were conducted based on the curved path scenario with various speed conditions. The design of algorithms and performance evaluations were conducted on Matlab/Simulink environment, and evaluation results reveal that the proposed algorithm is capable of detecting and reconstructing a fault signal reasonably well.