Unknown disturbance inputs estimation based on a state functional observer design

Xiong, Yi; Saif, Mehrdad

doi:10.1016/s0005-1098(03)00087-6

Cited by 218 publications

(129 citation statements)

References 13 publications

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“…That leads to a large number of elegant approaches to develop the disturbance observer as well as improve its performance. Xiong and Saif have proposed a state functional disturbance observer to estimate disturbances with a bounded error (8) . In this method, the disturbance observer state does not precisely track the system states, which is an advantage that simplifies the estimation error dynamics.…”

Section: Introductionmentioning

confidence: 99%

FPGA-based Wideband Force Control System with Friction-Free and Noise-Free Force Observation

et al. 2012

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In this paper, a novel force sensing method is proposed to achieve a wideband force control system with friction-free and noise-free observation. The effect of friction on force observation is eliminated owing to the addition of a periodic signal to the desired reference signal. A high-order disturbance observer and a Kalman filter are used for the forcesensing operation to reject the oscillatory disturbance and to suppress the noise in force estimation. In consequence of effective noise reduction using the Kalman filter, the force sensing bandwidth improves radically. Additionally, all the control algorithms are implemented in a field-programmable gate array (FPGA) with a high sampling rate; the FPGA enables the widening of the bandwidth of the force control system. The effectiveness of the proposed method is verified by experimental results.

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Section: Introductionmentioning

confidence: 99%

FPGA-based Wideband Force Control System with Friction-Free and Noise-Free Force Observation

et al. 2012

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“…모의실험에 사용된 시스템은 논문 [11,16]의 시스템에서 외 란 행렬을 수정한 식 (24)이다. 제안하는 외란 관측기의 전달함수는 식 (5)와 같고, 기존의 상수 외란 관측기의 전달함수는 아래 식과 같다 [11].…”

Section: 모의실험unclassified

Design of a Model-Based Low-Order Disturbance Observer to Estimate a Sinusoidal Disturbance with Unknown Constant Offset

Lee¹,

Son²

2016

The Transactions of The Korean Institute of Electrical Engineer

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-In practical control systems differences between nominal and real systems arise from internal uncertainties and/or external disturbances. This paper presents a model-based low-order disturbance observer for a sinusoidal disturbance with unknown constant offset. By using the disturbance model of a biased harmonic signal, the proposed method can successfully estimate the biased sinusoidal disturbance with unknown amplitude and phase but known frequency. At the first stage of the observer design, a model-based disturbance observer is designed when all the system states are measurable. Next, a sufficient condition is presented for the proposed observer to estimate the sinusoidal disturbance with a minimal-order additional dynamics using only output measurement. Comparative computer simulations are performed to test the performance of the proposed method. The simulation results show the enhanced performance of the proposed disturbance observer. 본 논문에서는 상수 외란에 대한 기존 연구 결과를 확장하여

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“…The input observability problem was addressed by Patton in (Hou & Patton, 1998) who gave some necessary and sufficient conditions to prove input observability for linear time invariant systems with unknown initial conditions. As far as the observer is concerned, Xiong (Xiong & Saif, 2003) proposed an Unknown Input Decoupled Functionnal Observer (UIDFO) which has no boundedness conditions as for time varying inputs and does not require differentiation of the measured outputs. The fact remains that control surfaces offer redundancies that make aileron failures not isolable.…”

Section: Fault Diagnosismentioning

confidence: 99%

“…In this part, results established in (Xiong & Saif, 2003) are recalled. The following dynamic system driven by both known and unknown inputs is considereḋ…”

Section: The Unknown Input Decoupled Functional Observermentioning

confidence: 99%

“…A, B, G and C are matrices with appropriate dimensions, C and G are assumed to be full rank. The UIDFO detailed in (Xiong & Saif, 2003) provides an estimationd of the unknown input d and an estimation z of linear combination of state Tx. Theoretically, no boundedness conditions are required for the unknown inputs and their derivatives.…”

Section: The Unknown Input Decoupled Functional Observermentioning

confidence: 99%

See 1 more Smart Citation

Active Fault Diagnosis and Major Actuator Failure Accommodation: Application to a UAV

Bateman¹,

Noura²,

Ouladsine³

2011

Advances in Flight Control Systems

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Unknown disturbance inputs estimation based on a state functional observer design

Cited by 218 publications

References 13 publications

FPGA-based Wideband Force Control System with Friction-Free and Noise-Free Force Observation

FPGA-based Wideband Force Control System with Friction-Free and Noise-Free Force Observation

Design of a Model-Based Low-Order Disturbance Observer to Estimate a Sinusoidal Disturbance with Unknown Constant Offset

Active Fault Diagnosis and Major Actuator Failure Accommodation: Application to a UAV

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