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Global Regulation of a Class of Nonlinear Systems with High-order Triangular Type Nonlinearity
구민성,최호림,임종태 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4
The problem of global regulation is investigated for a class of nonlinear systems which contain some high-order terms. We propose a high-order scaling state-feedback controller with appropriate dynamic gains. Compared to existing results, the condition on the nonlinearity is flexible due to the freedom of choosing the bounding positive function of the nonlinearity. Thus, the nonlinear systems with some high-order nonlinearities which do not belong to existing conditions can be globally regulated.
항공기 시스템 설계와 안전성평가에 운영경험 반영 사례 연구
구민성,Koo, Min-Sung 한국항공운항학회 2014 한국항공운항학회지 Vol.22 No.2
Airworthiness authorities specify the technical standards of airworthiness that propose minimum requirement of the commercial transport category and apply the rules in the certification process to ensure the safety of the aircraft. The Federal Aviation Administration and other national airworthiness authorities define the fatal accident risk levels for the safety assessment of the aircraft system and establish standard procedures to apply both qualitative and quantitative analysis techniques. However, an accident or incident may occur by the combination of various factors, although the aircraft is designed in accordance with the strict standards and approval by the Airworthiness Authorities. There are some key factors, such as human error, unpredictable complex system failures, degradation of the components reliability, improper maintenance task and intervals. Risk can be reduced by reflecting aircraft operational experience with similar types of aircraft in the process of aircraft development and safety assessment. Result of the root cause analysis for the Airbus A300-600 incident in which the aircraft engine reverser was deployed in the air have been introduced to reflect the design of system and related components. Also, this paper suggests to create a big-database in order to provide a feed-back to the FAR Part 25 transport category design and safety assessment of the operational experience.
시변지연과 미지 제어 방향과 비억제 성장율을 갖는 피드포워드 비선형 시스템의 안정화
구민성,최호림 제어·로봇·시스템학회 2022 제어·로봇·시스템학회 논문지 Vol.28 No.11
In this study, we investigate the regulation problem of a feedforward nonlinear system with time-varying state delay, an unknown control direction, and an unbounded growth function. The proposed controller was mainly developed using the Nussbaum gain and gain scaling techniques, and a rigorous system analysis was carried out to show that the controller achieved global regulation of the considered system. Numerical simulation results are provided to demonstrate the effectiveness of the proposed controller. .
Measurement Feedback Control of a Class of Nonlinear Systems via Matrix Inequality Approach
구민성,최호림,Koo, Min-Sung,Choi, Ho-Lim Institute of Control 2014 제어·로봇·시스템학회 논문지 Vol.20 No.6
We propose a measurement state feedback controller for a class of nonlinear systems that have uncertain nonlinearity and sensor noise. The new design method based on the matrix inequality approach solves the measurement feedback control problem of a class of nonlinear systems. As a result, the proposed methods using a matrix inequality approach has the flexibility to apply the controller. In addition, the sensor noise can be attenuated for more generalized systems containing uncertain nonlinearities.
Fast Regulation Control of a Class of Input-delayed Linear Systems with Pre-feedback
구민성,최호림 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1
A control problem of a class of input-delayed linear systems is considered in this paper. Due to the delay t in the input, any designed feedback controller can only be engaged after t≥ τ . Then, this can become the cause of slow regulation since any feedback information cannot be available during the delay. So, the initial function defined for -τ ≤ t ≤ 0 is engaged as an ‘initial non-feedback input’ for 0 ≤ t ≤ τ, which governs the system behavior during this initial time period. There have been numerous research results on the control of input-delayed linear systems by far. Yet, there have been no results on the examination and design of this initial function. Utilizing a time optimal control in the existing results, we show that if some pre-feedback as the initial function is engaged, the system response of the input-delayed linear system can be much improved, and a bang-bang input function is a good candidate as a pre-feedback which can provide better starting state values for the state feedback controller in order to perform the fast regulation. Two examples are given for the illustration of our results.
구민성,최호림,Koo, Min-Sung,Choi, Ho-Lim Institute of Control 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
We present an output feedback controller for a class of nonlinear systems with uncertain nonlinearity and sensor noise. The sensor noise has both a finite constant component and a time-varying component such that its integral function is finite. The new design and analysis method is based on the matrix inequality approach. With our proposed controller, the states and output can be ultimately bounded even though the structure of nonlinearity is more general than that in the existing results.
구민성,최호림 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.9
In this paper, a regulation problem for a class of lower triangular nonlinear systems under unknown measurement sensitivity by output feedback is considered. The distinguished feature is that the unknown measurement sensitivity is only required to be positive and bounded. The analysis is carried out to show the relation between the gain selection of an output feedback controller and the bound of the measurement sensitivity. Then, the adaptive gain-scalings of the controller are utilized to dominate the unknown growth rate of the nonlinearity.
구민성,최호림,임종태 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4
In this paper, feedback linearization method is proposed for nonlinear systems with a time varying delay in states. The diffeomorphism is presented to linearize the state-delayed nonlinear system if time-varying delay is known. Furthermore, we propose a control scheme to stabilize the approximate feedback linearizable system under the proposed conditions if the first order derivative of time-varying delay and the parametric uncertainties are finite and measurable.