著者

岡島 寛 南 裕樹 松永 信智

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.52, no.7, pp.393-400, 2016 (Released:2016-09-29)

参考文献数

24

被引用文献数

1

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Networked control has been studied by many researchers in recent years. This paper proposes a new system structure of the networked control systems. The evaluation system is presented to find the performance degradation caused by the communication channels. The proposed system has high degree of freedom for design and is not cumbersome structure. The effectiveness of the proposed structure is illustrated by numerical simulations.

著者

岡島 寛 上瀧 剛 松永 信智 内村 圭一

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.51, no.9, pp.645-654, 2015 (Released:2015-10-08)

参考文献数

19

被引用文献数

1

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A digital halftoning method for DLP projector system is proposed in this paper. PWM type 2-value images have been rapidly switched to achieve high resolution image in DLP projector systems. To achieve high frame rate image projection with high image quality, it is required to reduce the number of 2-value images with small degradation of the image quality. We propose a framework for optimizing color quantization and luminance for DLP projector system with a few number of the 2-value images. The optimal light intense is designed based on a particle swarm optimization algorithm. We illustrate the effectiveness of the proposed method by numerical examples.

著者

岡島 寛 澤田 賢治 松永 信智 南 裕樹

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.131, no.10, pp.1767-1774, 2011-10-01 (Released:2011-10-01)

参考文献数

21

被引用文献数

1

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This paper proposes a design method of dynamic quantizers for MIMO networked control systems. It is well known that feedback type dynamic quantizers are effective for quantization of the data series in the meaning of noise shaping. The dynamic quantizers include a set of a dynamic filter and a static quantizer. When it is required to use the quantizer under the network communication, the data size of signal should be minimized appropriately by the quantizers. The authors have proposed a design method of the dynamic quantizers for SISO systems based on the communication rate constraint. In this paper, the design method is extended to MIMO systems. By this extension, we can handle the communication rate constraint for a kind of concentrated systems. In the setting of the quantizer for MIMO system, bit assignment is important matter for appropriate design of information flow. The effectiveness of proposed design method is shown by numerical examples.

著者

岡島 寛 松永 信智

出版者

日本設計工学会

雑誌

設計工学 = Journal of Japan Society for Design Engineering : 日本設計工学会誌 (ISSN:09192948)

巻号頁・発行日

vol.50, no.4, pp.163-168, 2015-04

著者

丸野 裕太郎 Aydin Tarik ZENGIN 岡島 寛 松永 信智 中村 憲仁

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.79, no.808, pp.4721-4733, 2013 (Released:2013-12-25)

参考文献数

18

被引用文献数

2 6

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Electric-powered personal vehicles have been used as a convenient transportation device. A front-drive-type personal vehicle STAVi, that is easy for elderly but also disabled persons, to climb on from a bed has been focused on. However, front-drive-type personal vehicles are difficult to operate because their over-steering characteristic is strong owing to free casters. If the vehicle can be driven by an easy joy-stick operation, it will be a comfortable function for all users. In previous studies, we proposed a simple modeling error compensator which achieves a desired driving characteristics using a simple reference model, and the effectiveness was evaluated by simulations. In this paper, we propose a control system for STAVi using a modeling error compensator with a non-linear reference model to realize a comfortable under-steering characteristics. At first, the advantage of proposed controller is summarized. The STAVi's over-steering characteristic is modified to be under-steering one by proposed controller. As an experimental result, the additional assistance is necessary for a beginner. The phase-lead compensator for beginners is designed to adjust the maneuverability depending on the skill level. The maneuverability is evaluated by driving experiments on the slope.

著者

梅井 啓紀 岡島 寛 松永 信智 浅井 徹

出版者

一般社団法人 システム制御情報学会

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.27, no.2, pp.67-72, 2014-02-15 (Released:2014-05-15)

参考文献数

19

被引用文献数

7 5

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Many control system design methods are developed based on the dynamics of the accurate plant model. However, desired control performance cannot be achieved by the designed controller if the modeling error is not small. To overcome this problem, we have proposed a compensator to minimize the gap between an actual plant and its nominal model in SISO setting. The compensator design problem has been reduced to the standard LMI design problem and the modeling error is minimized. Consequently, the desired control performance can be achieved if we use the designed controller with our proposed compensator. The design method is extended to MIMO systems. In particular, not only error between compensated system and model, but also magnitude of the compensation input are handled in the compensator design. The effectiveness is shown by the numerical examples.

著者

鍋倉 司樹 岡島 寛 松永 信智

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.50, no.3, pp.295-302, 2014 (Released:2014-03-20)

参考文献数

15

被引用文献数

2

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AD/DA conversion has become a core technology in digital signal processing. Traditionally, AD/DA systems are composed of the post-filter and the quantizer, and it is required to satisfy the low quantization noise and the low distortion characteristics. However, it is well known that there exists trade-off between these two characteristics. In previous studies, we proposed a new design method of AD/DA system that includes pre-filter, in addition to the traditional AD/DA systems. Post and pre-filters are designed towards the original signal, so as to minimize the effect of noise and distortion due to quantization. In this paper, we verify the AD/DA systems with post and pre-filters by using the voice signal compression system. We evaluate the effectiveness using DMOS (Degradation Mean Opinion Score) method.