著者

佐藤 隆太郎

巻号頁・発行日

2021-03

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Supervisor: 上原 隆平

著者

新谷 理恵子 佐藤 三穂 大友 里奈 佐藤 靖 佐藤 隆太 中山 瑛里 大萱生 一馬 奥村 美灯 逸見 奈緒 矢野 理香 髙橋 久美子

出版者

一般社団法人 日本看護研究学会

雑誌

日本看護研究学会雑誌 (ISSN:21883599)

巻号頁・発行日

pp.20210816139, (Released:2022-01-24)

参考文献数

18

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目的:北海道の高度急性期医療を担う病棟看護師がCOVID-19患者の受け入れを開始してからどのような体験をして,どのような心理状況にあったかを明らかにする。方法:病棟看護師13名を対象にフォーカス・グループインタビューを行い質的に分析した。結果:【患者の受け入れ決定に対する葛藤】,【未知で新規の感染症であることに由来するつらさ】,【自分や家族の感染に対する不安】などを経験し,【看護を続ける中で生じるジレンマ】,【患者の看取りに関わる中での複雑な思い】を持っていた。一方で【病院が体制を整えようとしてくれていることへの安心感】,【協働しながら実践できているという思い】,【看護への責任と成長】を感じていた。結論:病棟看護師はつらさや葛藤といった心理状況があった一方で,看護を継続できている思いも持っていた。これらの経験の理解がより良い看護に向けた看護管理体制の整備に重要である。

著者

崔 成日 高橋 和也 堤 正臣 佐藤 隆太

出版者

精密工学会

雑誌

精密工学会誌 = Journal of the Japan Society of Precision Engineering (ISSN:09120289)

巻号頁・発行日

vol.73, no.9, pp.1040-1045, 2007-09-05

参考文献数

10

被引用文献数

3 2

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This paper describes the measuring methods for positioning accuracy of tilting axes in five-axis controlled machining centers with a tilting rotary table. The top surface of the tilting rotary table is generally in higher position than the tilting axis. In this case, there is no measuring method except for a manually operated clinometer. Thus, a clinometer consisting of a precision rotary encoder and a bubble level was firstly developed. In the method, operators have to read visually the scale of the level and the reading accuracy is dependent on their ability. Instead of the bubble level, an electronic level with high resolution was employed for comparison. A ball bar equipment was also applied to measure the angular positioning accuracy of the tilting rotary table, as the ball bar equipment can measure the angular displacement continuously.

著者

今木 大輔 佐藤 隆太 堤 正臣

出版者

公益社団法人 精密工学会

雑誌

精密工学会学術講演会講演論文集

巻号頁・発行日

vol.2006, pp.173-174, 2006

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工作機械や半導体製造装置の送り駆動系には,一般的に直動転がり案内機構としてボールガイドが用いられている.特に近年採用されつつあるリニアモータを用いた送り駆動系では,接触が直動転がり案内部分のみとなるため,送り駆動系の摩擦特性は直動転がり案内の特性に大きく依存する.本研究では,ボールガイドの球径が,送り駆動系全体の摩擦挙動に及ぼす影響を実験的に解析している.

著者

佐藤 隆太

出版者

公益社団法人 精密工学会

雑誌

精密工学会学術講演会講演論文集 2016年度精密工学会春季大会

巻号頁・発行日

pp.473-474, 2016-03-01 (Released:2016-09-02)

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同時2軸制御運動である円運動を行うと,各軸の運動方向が反転する象限切替え時に,摩擦の影響により象限突起と呼ばれる突起状の軌跡誤差が生じる.象限突起が発生することの事実は広く知られているが,その補正のためには現象を正しく理解することが重要である.ここでは,象限突起の発生メカニズムについて,摩擦特性と送り駆動系の外乱抑制特性との関係に基づいて説明するほか,象限突起の発生に影響を及ぼす因子について示す.

著者

野口 晋 西田 勇 佐藤 隆太 白瀬 敬一

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

vol.83, no.856, pp.17-00254-17-00254, 2017 (Released:2017-12-25)

参考文献数

14

被引用文献数

1

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It is known that the cutting force excites the structural vibration of machine tool. In addition, cutting force acts on feed and spindle drive system as a force disturbance, and feed speed and spindle speed are changed. As the results, cutting force is also changed because the depth of cut and cutting speed are changed due to the machine vibration, feed and spindle speed changes. The purpose of this study is to analyze the coupled vibration between the machine tool behavior and the cutting force. In order to achieve the purpose, in this study, a coupled simulation method of the vibration of machine tool, the dynamic behaviors of feed and spindle drive systems and the cutting force is developed. Cutting force and machined surface geometry is simulated using the voxel simulator in which the workpieces is represented by voxels. Undeformed chip thickness can be calculated based on the relative position between the tool and workpieces, and the tool rotational angle at the each time step based on the voxel model. The cutting force is estimated based on the calculated undeformed chip thickness. The relative position between tool and workpiece at each time step is simulated by the feed drive system and machine tool structural models. The tool rotational angle is simulated by the spindle drive system model. The coupled simulation between the cutting force, structural vibration of machine tool and feed and spindle drive systems is carried out by applying the simulated cutting force and cutting torque as a disturbance to the feed and spindle drive systems and machine tool structure. Cutting tests and simulations are carried out with two kinds of radial depth of cut, 5 mm and 20 mm. It is confirmed that the machine tool dynamic behaviors due to the cutting force and torque which is also influenced by the machine tool behaviors can be simulated by the proposed method. It is also confirmed that the chatter vibration which is observed in case of the 20 mm depth of cut can be simulated by the proposed method.

著者

金子 和暉 西田 勇 佐藤 隆太 白瀬 敬一

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

vol.83, no.856, pp.17-00247-17-00247, 2017 (Released:2017-12-25)

参考文献数

9

被引用文献数

3

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In end milling, in order to improve machining efficiency and accuracy, instantaneous rigid force model is widely used to predict cutting force and improve cutting conditions. The instantaneous rigid force model is well known as the practically simple model to predict cutting force. However this model requires the six parameters called cutting coefficients which have to be determined by the experimental milling operation. So several experimental milling operations are needed before cutting force prediction. In this study, a new instantaneous rigid force model based on oblique cutting is proposed. In this force model, the end milling process is modeled using the oblique cutting model. Therefore, cutting force prediction can be realized using only the one parameter such as shear angle instead of the six parameters such as cutting coefficients required for a conventional instantaneous rigid force model. The shear angle can be determined from tangential milling force or milling torque. And this force model is easier to apply for practical cutting force prediction, because time and effort to determine the parameter(s) before cutting force prediction. The validation of this force model compared with the conventional force model is performed. As the result, cutting forces predicted by the proposed force model has good agreement with the measured cutting forces. Also, the proposed force model has good performance in a wide range of cutting conditions compared with the conventional force model.

著者

佐藤 隆太

出版者

神戸大学

雑誌

若手研究(B)

巻号頁・発行日

2011

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本研究では,実際の数値制御工作機械の送り駆動系をモデル化し,送り駆動系の運動誤差を考慮して加工面をシミュレーションするための方法を開発した.送り駆動系の運動誤差が加工面に及ぼす影響について,実験とシミュレーションの両面から検討したところ,同じ運動誤差が生じていても工具経路によって加工面に及ぼす影響が異なることが明らかとなり,工作機械の運動特性を考慮した知能化CAMシステムの実現に向けた重要な知見を得ることができた.

著者

佐藤 隆太 横堀 祐也 堤 正臣

出版者

公益社団法人精密工学会

雑誌

精密工学会誌論文集 (ISSN:13488724)

巻号頁・発行日

vol.72, no.1, pp.73-78, 2006-01-05

被引用文献数

8 8

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This paper describes the dynamic synchronous accuracy between the axes of translational and rotational in a 5-axis machining center. The 5-axis machining centers are applied to machining complex shapes, such as trurbine blades and impellers. When the 5-axis machining centers are used to machine complex shapes, the velocity of each axis varies greatly. Therefore, the synchronous accuracy of each axis is an important factor to generate high accuracy shapes. In this study, non-uniform 3-axis synchronous motion was investigated in order to estimate the dynamic synchronous accuracy. A dynamic model of the each axis including a rotary axis was developed, and the synchronous motion was simulated. As the results of experiment and simulation, it is verified the developed model can express the experimental results accurately. In addition, a method that can improve the synchronous accuracy is proposed, and its effectiveness is clarified by the developed dynamic model.