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On-line Identification Algorithm and Convergence Analysis for Sandwich Systems with Backlash
Ruili Dong,Yonghong Tan 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.3
In this paper, an on-line algorithm for identification of sandwich systems with backlash is proposed. In this method, the sandwich systems with backlash can be transformed into a special model where all the model parameters are separated based on the so-called key term separation principle. In this case, a piecewise model with linear coefficients combining with nonlinear variables is obtained. Thus, an ex-tended recursive identification algorithm is used to estimate the parameters of the proposed model. Fi-nally, the modeling results on an X-Y positioning stage are presented.
Observability and Controllability Analysis for Sandwich Systems with Dead-zone
Yonghong Tan,Na Luo,Ruili Dong 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
In this paper, an approach to analyze the observability and controllability of sandwich systems withdead-zone is proposed. In this method, a non-smooth state-space function is proposed to describe the sandwichsystems with dead-zone which are also non-smooth nonlinear systems. Then, a linearization method based onnon-smooth optimization is proposed to derive a linearized state-space function to approximate the non-smoothsandwich systems within a bounded region around the equilibrium points that we are interested in. Afterwards,both observability and controllability matrices are constructed and the methods to analyze the observability as wellas controllability of sandwich system with dead-zone are derived. Finally, a numerical example is presented.
Robust-nonsmooth Kalman Filtering for Stochastic Sandwich Systems with Dead-zone
Baoan Li,Yonghong Tan,Lei Zhou,Ruili Dong 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
In this paper, a robust-nonsmooth Kalman filtering approach for stochastic sandwich systems with deadzone is proposed, which can guarantee the variance of filtering error to be upper bounded. In this approach, thestochastic sandwich system with dead-zone is described by a stochastic nonsmooth state-space function. Then, inorder to approximate the nonsmooth sandwich system within a bounded region around the equilibrium point, alinearization approach based on nonsmooth optimization is proposed. For handling the model uncertainty causedby linearization and modeling, the robust-nonsmooth Kalman filtering method is proposed for state estimation ofthe stochastic sandwich system with dead-zones with model uncertainty. Finally, both simulation and experimentalexamples are presented for evaluating the performance of the proposed filtering scheme.
Identification of a Small Molecule Sensitizing DNA Repair Deficiency
Yongliang Zhang,Jennifer T. Fox,Gene Elliott,Ganesha Rai,Mengli Cai,Srilatha Sakamuru,Ruili Huang,Menghang Xia,Kyeryoung Lee,Hee Dong Park,Winfried Edelmann,David Maloney,Kyungjae Myung 한국실험동물학회 2015 한국실험동물학회 학술발표대회 논문집 Vol.2015 No.8
A Novel Design of Compact Low-Pass Filter and Its Equivalent Circuit Model
Rui LI,Dong-ll KIM,Chang-Mook CHOl,Young-Man SONG 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2006 No.-
A novel design of compact low-pass filter based on microstrip structure and its equivalent-circuit model are developed. The philosophy of the structure behind this novel microstrip low-pass filter is simple as it is composed of a pair of symmetrical parallel coupled-line and an open-stub. With this configuration, a finite attenuation pole near the stopband cutoff frequency is available and adjustable by simply tuning the circuit parameters. Furthermore, the rejection bandwidth of this type of lowpass filter can be extended. In order to validate the feasibility of the proposed design method, a low-pass filter based on a microstrip structure is designed, fabricated, and measured. Experimental results agree very well with the simulation and analytical results.
Semi-Lumped Compact Low-Pass Filter for Harmonics Suppression
Rui Li,Dong Il Kim,Chang-Mook Choi 한국전자파학회JEES 2006 Journal of Electromagnetic Engineering and Science Vol.6 No.3
In this paper, a new semi-lumped low-pass filter with three finite attenuation poles at stopband is presented. The new structure is composed of a pair of symmetrical parallel coupled-line and a shunted capacitor. With this configuration, three finite attenuation poles can be available for 2nd, 3rd, and 4th harmonics suppression. The research method is based on transmission-line model for tuning the attenuation poles. In order to examine the feasibility of the proposed structure, a low-pass filter based on microstrip structure with harmonics suppression is designed, fabricated, and measured. The experimental results of the fabricated circuit agree well with the simulation and analytical ones.
Compact Structure With Three Attenuation Poles for Improving Stopband Characteristics
Rui Li,Dong Il Kim,Chang Mook Choi IEEE 2006 IEEE microwave and wireless components letters Vol.16 No.12
<P>A novel compact structure with three controllable finite attenuation poles at stopband is presented. The new structure is composed of a pair of symmetrical parallel coupled-lines and a capacitive load. With this configuration, three finite attenuation poles are available, which can improve the stopband characteristics of low-pass filters (LPFs) or the upper stopband performances of band-pass filters. The research method is based on a transmission-line model for tuning the finite attenuation poles. In order to examine the feasibility of the proposed structure, a new type of LPF with broad stopband and sharp cutoff frequency response is designed, fabricated, and measured. The experimental results of the fabricated circuit agree well with the simulation and analytical ones</P>
Compact Low-Pass Filter with Sharp Skirt Characteristics and Broad Stopband
Rui Li,Dong-Il Kim,Chang-Mook Choi 한국항해항만학회 2006 한국항해항만학회지 Vol.30 No.7
A new compact microstrip low-pass filter and its equivalent-circuit model are developed. The philosophy if the structure behind this novel microstrip low-pass filter is simple as it is composed of a pair of symmetrical parallel coupled-line and an open-stub. With this configuration, a finite attenuation pole near the stopband cutoff frequency is available and adjustable by simply tuning the circuit parameters. Furthermore, the rejection bandwidth if this type if low-pass filter am be extended In order to validate the feasibility of the proposed design method, a low-pass filter based on a microstrip structure is designed, fabricated, and measured Experimental results agree very well with the simulation and analytical results.