The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
Yasuaki Oishi - One of the best experts on this subject based on the ideXlab platform.
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Passivity degradation under the discretization with the zero-order hold and the Ideal Sampler
49th IEEE Conference on Decision and Control (CDC), 2010Co-Authors: Yasuaki OishiAbstract:Quantitative study is made on how much passivity is lost when a continuous-time nonlinear system is discretized for digital implementation of a controller. The standard discretization with the zero-order hold and the Ideal Sampler is mainly considered though other types of discretization are also considered. The result can be used for the choice of the sampling period. Namely, the sampling period has to be small when the original continuous-time system is oscillatory. The general input-output framework is used for the discussion.
Kouhei Ohnishi - One of the best experts on this subject based on the ideXlab platform.
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Performance Analysis of Bilateral Control System With Communication Bandwidth Constraint
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Daisuke Yashiro, Kouhei OhnishiAbstract:It is difficult to realize a transparent bilateral control over network because communication time delay, jitter, or packet loss deteriorates transparency and stability. Although many dead time compensation methods have been considered, each approach does not realize both high transparency and stability. To solve the problem, our previous work has proposed a multirate sampling method for bilateral control systems. In this approach, packet-sending period tp is set to larger than the control period of the master/slave robot control tc. This method has an advantage to improve the transparency because large tp often reduces communication delays. However, that work has not shown the relationship between the transparency and the value of tp. Therefore, this paper analyzes the relationship between the transparency and tp by introducing frequency characteristic of an Ideal Sampler and a zero-order holder. In addition, the validity of the analysis is shown by experimental results.
Andrew C. Singer - One of the best experts on this subject based on the ideXlab platform.
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A performance bound on low-pass reconstruction from PWM signals
2015 IEEE International Conference on Communications (ICC), 2015Co-Authors: Noyan C. Sevuktekin, Andrew C. SingerAbstract:A performance bound on low-pass reconstruction of a finite energy, band-limited signal from its corresponding pulse width modulated (PWM) signal is given. A finite dimensional input signal structure is proposed and its characteristics such as ℒ∞ norm and convergence rate in the tail regions are investigated. The criteria on sampling rate and reference signal structure for lossless PWM generation are specified. With uniform oversampling, different PWM structures are constructed using a generator consisting of an Ideal Sampler and a comparator. An equivalent model for PWM generation and low-pass reconstruction is proposed in order to separate infinite energy components in the modulated signal from the finite energy information bearing components. Using the equivalent model, bounds on distortion energies due to low-pass reconstruction and the corresponding signal to distortion ratios are given. Characteristics of low-pass reconstruction from different PWM signals such as output shifts, blurring effects and distortion attenuations are discussed.
Daisuke Yashiro - One of the best experts on this subject based on the ideXlab platform.
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Performance Analysis of Bilateral Control System With Communication Bandwidth Constraint
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Daisuke Yashiro, Kouhei OhnishiAbstract:It is difficult to realize a transparent bilateral control over network because communication time delay, jitter, or packet loss deteriorates transparency and stability. Although many dead time compensation methods have been considered, each approach does not realize both high transparency and stability. To solve the problem, our previous work has proposed a multirate sampling method for bilateral control systems. In this approach, packet-sending period tp is set to larger than the control period of the master/slave robot control tc. This method has an advantage to improve the transparency because large tp often reduces communication delays. However, that work has not shown the relationship between the transparency and the value of tp. Therefore, this paper analyzes the relationship between the transparency and tp by introducing frequency characteristic of an Ideal Sampler and a zero-order holder. In addition, the validity of the analysis is shown by experimental results.
Noyan C. Sevuktekin - One of the best experts on this subject based on the ideXlab platform.
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A performance bound on low-pass reconstruction from PWM signals
2015 IEEE International Conference on Communications (ICC), 2015Co-Authors: Noyan C. Sevuktekin, Andrew C. SingerAbstract:A performance bound on low-pass reconstruction of a finite energy, band-limited signal from its corresponding pulse width modulated (PWM) signal is given. A finite dimensional input signal structure is proposed and its characteristics such as ℒ∞ norm and convergence rate in the tail regions are investigated. The criteria on sampling rate and reference signal structure for lossless PWM generation are specified. With uniform oversampling, different PWM structures are constructed using a generator consisting of an Ideal Sampler and a comparator. An equivalent model for PWM generation and low-pass reconstruction is proposed in order to separate infinite energy components in the modulated signal from the finite energy information bearing components. Using the equivalent model, bounds on distortion energies due to low-pass reconstruction and the corresponding signal to distortion ratios are given. Characteristics of low-pass reconstruction from different PWM signals such as output shifts, blurring effects and distortion attenuations are discussed.
