著者

山本 建太 伊藤 弘樹 菊池 司

出版者

一般社団法人映像情報メディア学会

雑誌

映像情報メディア学会技術報告 (ISSN:13426893)

巻号頁・発行日

vol.38, pp.211-213, 2014

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現在では、大きな建物やライブの演出などにプロジェクションマッピングを用いているのが主流であるが、それをあえて小型化することによって、プロジェクションマッピングをより身近に体験できるツールとして、本研究では、プロジェクションマッピングとアミッドスクリーンの後ろが透けて見える特性を生かした、今までにない宣伝ツールを提案する

著者

山本 建郎

出版者

秋田大学

雑誌

秋田大学教育文化学部研究紀要. 人文科学・社会科学 (ISSN:1348527X)

巻号頁・発行日

vol.59, pp.57-61, 2004-03-31

著者

山藤 勝彦 山本 建 澤田 賢治

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 (ISSN:21879761)

巻号頁・発行日

vol.83, no.852, pp.16-00553-16-00553, 2017 (Released:2017-08-25)

参考文献数

11

被引用文献数

1

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This paper describes self-excited oscillation caused by coulomb friction of electromagnetic proportional valve. Especially, this research focuses on a hydraulic system in which electromagnetic proportional and pressure proportional valves are located tandem. In the system, the coulomb frictional force effects on the displacement direction of the spool of the former valve and the piston is established in the downstream region of the latter valve. Each valve is stable, but, the connection of them causes instability. This paper analyzes the mechanism of this unstable vibration and then investigates an anti-vibration design method. In analysis, this paper clarifies that the vibration is caused by an elastic deformation delay of the oil in the piston. This delay increases the phase delay of the spool due to the coulomb frictional force. After replacing the coulomb frictional force with hysteresis, the proposed method uses the describing function method to express phase delay phenomenon due to the coulomb frictional force. The describing function is the complex function which expresses an amplitude ratio and phase difference with the input and output of nonlinear element. The delay of a vibration factor is linearized by converting coulomb friction into hysteresis. The effectiveness of the proposed method is demonstrated via practical experiment and non-linear simulation results.

著者

山本 建郎

出版者

秋田大学

雑誌

秋田大学教育学部情報科学研究紀要 (ISSN:09183183)

巻号頁・発行日

vol.2, pp.33-50, 1993-03

著者

山本 建郎

出版者

秋田大学

雑誌

基盤研究(C)

巻号頁・発行日

2009

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アリスティデス・クィンテリアヌスの『音楽論』全三巻を翻訳し、詳しい注釈を付した。それによって、これまで不明として不問に伏せられていたいくつかの点に決着をつけ、古代ギリシアの音階理論のほぼ全容を明らかにした。

著者

山藤 勝彦 橋本 真 山本 建 澤田 賢治

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.57, no.7, pp.324-333, 2021 (Released:2021-07-17)

参考文献数

13

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Judder is well known as a vibration that occurs in a dry clutch. In order to maintain the ride quality and quietness of dry clutches, research on judder analysis and mechanical design to suppress judder is actively pursued. This paper describes the design and implementation of robust control techniques as an approach to suppressing judder during gear shifting in traction-controlled transmissions. This paper is concerned with transmissions that exhibit strongly nonlinear frictional characteristics that can only be approximated by higher order polynomials. Specifically, the coefficient of friction varies significantly nonlinearly with the rotational speed during gear shifting. In this paper, the controller is designed by expressing this nonlinear property as the uncertainty of the frequency. Simulation and bench test results are presented to validate the validity of such an approach. The results show that judder-free shifting is possible with the proposed approach. Furthermore, the requirements of three controllers are presented by analyzing the robust controllers.

著者

山本 建郎

出版者

東北哲学会

雑誌

東北哲学会年報 (ISSN:09139354)

巻号頁・発行日

vol.10, pp.1-13, 1994-06-30 (Released:2018-02-28)

著者

山本 建郎

出版者

東北哲学会

雑誌

東北哲学会年報 (ISSN:09139354)

巻号頁・発行日

vol.1, pp.18-33, 1985-03-25 (Released:2018-02-28)

著者

山本 建郎

出版者

日本イギリス哲学会

雑誌

イギリス哲学研究 (ISSN:03877450)

巻号頁・発行日

vol.28, pp.5-17, 2005-03-20 (Released:2018-03-30)

著者

山藤 勝彦 山本 建 橋本 真 新 誠一 澤田 賢治

出版者

一般社団法人日本機械学会

雑誌

年次大会 : Mechanical Engineering Congress, Japan

巻号頁・発行日

vol.2013, pp."J101012-1"-"J101012-5", 2013-09-08

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Judder is well known oscillation occurring in dry clutches. To maintain riding comfort and silence in dry clutches, a lot of studies of judder analysis and machine design suppressing judder have been done. This paper describes the design and implementation of a robust control technique as a judder suppression approach for clutch during shifting. We address the automatic transmission using dry clutches of which the μ-V characteristics show a complicated nonlinearity. Specifically, their friction coefficient varies non-linearly with respect to the rotational speed during shifting. In this paper, it is clarified that the non-linear μ-V characteristic can be expressed as frequency uncertainties and then the control system is constructed with H∞ control. To verify the validity of such the approach, the results of simulation and bench testing are presented. As a result, we see that the proposed approach allows us to achieve the shifting without judder. Furthermore, we show the three controller requirements by analyzing the robust controllers.

著者

山本 建太 伊藤 弘樹 菊池 司

出版者

一般社団法人 映像情報メディア学会

雑誌

映像情報メディア学会技術報告

巻号頁・発行日

vol.38, pp.211-213, 2014

---

現在では、大きな建物やライブの演出などにプロジェクションマッピングを用いているのが主流であるが、それをあえて小型化することによって、プロジェクションマッピングをより身近に体験できるツールとして、本研究では、プロジェクションマッピングとアミッドスクリーンの後ろが透けて見える特性を生かした、今までにない宣伝ツールを提案する

著者

山本 建郎

出版者

日本西洋古典学会

雑誌

西洋古典學研究 (ISSN:04479114)

巻号頁・発行日

vol.51, pp.20-30, 2003-03-20

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As is well known, in the Respublica III Plato remarks many kinds of harmoniai, among which he selects the Dorian and the Phrygian as fitting subject matter for education of the young The aim of this paper is firstly to find out the real nature of Dorian and other harmoniai The detailed structures are shown in the additional paragraph of Aristides Quintihanus (Arq)' De Musica I ch 9 as old-fashioned harmoniai, according to which we can guess that Plato's Dorian is akin to the form of disjunction of two tetrachords, the standard style of a scale of an octave On the other hand the rationalized styles of harmoniai as the species of an octave are also described in Arq (I ch 8) These structures correspond to the modes of Western Medieval and Renaissance music Historically speaking the standard schema of an octave has developed through Terpander's improvement Terpander's schema has been guessed to be conjunction of tetrachords added the tonos uppermost But this schema shows the Mixolydian octave instead of the Dorian To be Dorian the schema must be the form of disjunction As an evidence of the disjunct octave we can take up Nicomachus' description of Philolaus' scale in the Enchilidion ch 9 This passage is opposed to the description of Pythagoras' scale (Ench ch 5), which is an improvement of the old-fashioned conjunct scale Compared to Nicomachus' passages we can conclude that Terpander's schema must have been the disjunct schema devoid of the trite Terpander arranged the old-fashioned Dorian which had appeared much earlier into the rationalized schema of the disjunct octave Contrary to the Dorian the other old-fashioned harmoniai are supposed to come into existence respectively These traces could be seen in Plutarch's description (mainly on the Mixolydian) So the rationalized style of harmoniai which form the species of an octave should have come into existence somewhat later They might have been constructed artificially about BC430 when Eratocles (an inventor of the circularity of a scale) and Damon were both in their akme Plato's so called Dorianism is supposed to be a reaction against the overflowing of ethos of his age But Plato was not a theorist of harmonics, so he was unable to make an actual reformation It was Aristoxenus (Arx ) who reformed the musical situation by replacing the species with tonoi (pitch) Each tonos is also the same fragment as the species of an octave, but there is a central note, the mese, around which all of the other notes move As the mese works as a central note, many kinds of ethos in the species of an octave disappear, and the scale is reduced to the Dorian The system of tonos presupposes the Great Perfect System (GPS), two octaves system which has the mese as a central note Usually GPS wasconjectured to be arranged about at the middle of the 4^<th> century BC and succeeded by Arx , but I assert as a conclusion that it was invented by Arx constructing the system of tonos