文献一覧: 佐藤勇 (著者)

1 0 0 0 OA レベルセット法に基づく複数材料を対象としたトポロジー最適化

著者: 岸本直樹野口悠暉佐藤勇気泉井一浩山田崇恭西脇眞二
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.849, pp.17-00069-17-00069, 2017 (Released:2017-05-25)
参考文献数: 24
被引用文献数: 8

Topology optimization is the most flexible type of structural optimization method. This method has been applied in a variety of physics problems dealing with a multitude of design problems. In a given design problem, however, the optimization problem often has conflicting evaluative functions, such as the need for high rigidity in combination with minimal weight. The difficulty of simultaneously achieving high performance for two or more functions may be further compounded because current topology optimization methods typically only deal with a single material. On the other hand, when multiple kinds of materials having various properties can be selected for use, the range of a designer's choices is increased and an appropriate solution that greatly improves product functions may be achieved. Thus, this paper presents a new topology optimization method for multi-materials that obtains high-performance configurations. We apply the Multi-Material Level Set (MM-LS) topology description model in the topology optimization method, which uses a total of n level set functions to represent n materials, plus the void phase. The advantage of the MM-LS model is that clear optimal configurations are obtained and the design sensitivity for multi-material structures can be easily calculated. The level set functions that are design variables are updated using the topological derivatives, which also function as design sensitivities, and we derive the topological derivatives for multiple materials. Through several numerical examples, we demonstrate the validity of the proposed method.

2017-06-17 15:26:57
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1 0 0 0 OA 鼻笛に関する基礎的研究

著者: 大場啓介長嶺拓夫森博輝佐藤勇一
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: pp.14-00593, (Released:2015-02-24)
参考文献数: 8

This paper describes the investigations of the characteristic about the sound generation of a nose flute experimentally. The nose flute is attached to the upper part of a container. If air is passed to a nose flute, sound will occur. The volume of a container is changed and the generated sound is measured. The natural frequencies of an experimental device are calculated and we confirm that it is in agreement with frequency of sound generated in experiment. We show that nose flute is a unique musical instrument with the point that a nose flute has only an edge part and uses people's mouth for a resonance body part. The frequencies of resonance sound can be calculated from the capacity in a mouth, the thickness and the area of an opening of a nose flute. When people play a nose flute, it is thought that only the first mode of vibration is used.

2016-05-15 19:43:05
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1 0 0 0 鼻笛に関する基礎的研究

著者: 大場啓介長嶺拓夫森博輝佐藤勇一
出版者: The Japan Society of Mechanical Engineers
雑誌: 日本機械学会論文集 (ISSN:21879761)
巻号頁・発行日: vol.81, no.824, pp.14-00593-14-00593, 2015

This paper describes the investigations of the characteristic about the sound generation of a nose flute experimentally. The nose flute is attached to the upper part of a container. If air is passed to a nose flute, sound will occur. The volume of a container is changed and the generated sound is measured. The natural frequencies of an experimental device are calculated and we confirm that it is in agreement with frequency of sound generated in experiment. We show that nose flute is a unique musical instrument with the point that a nose flute has only an edge part and uses peoples mouth for a resonance body part. The frequencies of resonance sound can be calculated from the capacity in a mouth, the thickness and the area of an opening of a nose flute. When people play a nose flute, it is thought that only the first mode of vibration is used.

2015-05-26 14:28:18
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1 0 0 0 IR スケートボードの推進メカニズム(機械力学,計測,自動制御)

著者: 佐藤勇一長嶺拓夫多田裕行
出版者: 一般社団法人日本機械学会
雑誌: 日本機械学會論文集. C編 (ISSN:03875024)
巻号頁・発行日: vol.72, no.724, pp.3905-3911, 2006-12-25

rights: 社団法人日本機械学会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110006153484/This paper describes the propulsion mechanism of a skateboard. We observed the behavior of a rider on a skateboard and built experimental apparatuses. Further we analyze the characteristic by using a two dimensional analytical model. Comparing experimental and analytical results we show that primary propulsion of a skateboard is given by twisting motion of a rider. Propulsion is influenced considerably by the phase difference between twisting motion and tilting the front and rear wheel axles, that is, torque acting on a skateboard and angle of the two axles.