Fault Estimation in Finite Frequency Domain for Uncertain Systems with Sensor Fault

2018 ◽  
Author(s):  
Hongxia Li ◽  
Yang Wang ◽  
Xiaoning Wu ◽  
Hongjuan Yu ◽  
Rong Li ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Uncertain Systems ◽  
Fault Estimation ◽  
Sensor Fault ◽  
Finite Frequency

scholarly journals H∞ fault estimation of robot joint in finite frequency domain

2021 ◽  
Vol 261 ◽  
pp. 01067
Author(s):  
Yuedou Pan ◽  
Zhanbo Xiong
Keyword(s):  
Fault Diagnosis ◽  
Frequency Domain ◽  
Design Method ◽  
Frequency Theory ◽  
Design Methods ◽  
Fault Estimation ◽  
Finite Frequency

The fault estimation of robot joint is of great significance to improve the reliability and stability of robot joint. Based on the design of fault diagnosis observer and the finite frequency theory, a method of H infinite fault estimation with frequency domain is proposed. The design method combines H infinite filter wave with finite frequency technology effectively, and has strong anti-interference performance, Compared with other design methods, the method proposed in this paper can improve the accuracy of fault estimation

Fault estimation and observer-based fault-tolerant controller in finite frequency domain

2017 ◽  
Vol 40 (5) ◽  
pp. 1659-1668 ◽  
Author(s):  
Yingying Tian ◽  
Fanglai Zhu
Keyword(s):  
Frequency Domain ◽  
Controller Design ◽  
Fault Tolerant ◽  
Sufficient Conditions ◽  
Original System ◽  
Descriptor System ◽  
Fault Estimation ◽  
Linear Matrix ◽  
Finite Frequency ◽  
Closed Loop System

In this paper, the problems of finite-frequency fault estimation (FE) and fault tolerant controller design are investigated for a class of systems subjected to both sensor and actuator faults. To begin with, by introducing an expanded state vector, the original system is transformed into a descriptor system, and then an unknown input proportional-integral observer (PI) is developed to provide state and FE, which avoids the overdesign problems occurring in the entire frequency domain. After this, based on reconstructed information, an observer-based fault-tolerant controller is designed to stabilize the closed-loop system even if it suffers from faults and disturbances. In addition, the sufficient conditions of the existence of the PI and fault tolerant controller are derived by linear matrix inequality (LMI) tools. Finally, a simulation example is presented to demonstrate the effectiveness of the proposed techniques.

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