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NAGAMINE Takuo
| Mechanical Science Division | Professor |
| Department of Mechanical Engineering and System Design |
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■ MISC- 複数振動子と支持系の連成振動
長嶺拓夫; 佐藤勇一; 森博輝
Volume：74, Number：739, First page：554, Last page：561, 2008
DOI：https://doi.org/10.1299/kikaic.74.554
DOI ID：10.1299/kikaic.74.554, ISSN：0387-5024, CiNii Articles ID：110006643668 - Synchronization and Chaos of Unbalanced Rotors on a Flexible Structure
NAGAMINE Takuo; SATO Yuichi; KAWASE Kosuke
JSDD, Volume：2, Number：1, First page：45, Last page：53, 2008
This paper describes the numerical calculations on the vibrations of a structure excited by two unbalanced rotors. When two rotors rotate on a base plate, which is free to vibrate horizontally, some kinds of vibration modes, i.e., in-phase synchronization, out-of-phase synchronization, and non-synchronization are observed. According to our investigation of rotor unbalance, we observed two types of non-synchronization. One is quasi-periodic vibration, and the other is chaos.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jsdd.2.45
DOI ID：10.1299/jsdd.2.45, ISSN：1881-3046, CiNii Articles ID：130000098862 - 複数振動子と支持系の連成振動
長嶺拓夫; 佐藤勇一; 森博輝
日本機械学会論文集C編, Volume：74, Number：739, First page：554, Last page：561, 2008
DOI：https://doi.org/10.1299/kikaic.74.554
DOI ID：10.1299/kikaic.74.554, ISSN：0387-5024, CiNii Articles ID：110006643668 - Synchronization and Chaos of Unbalanced Rotors on a Flexible Structure
Takuo NAGAMINE; Yuichi SATO; Kosuke KAWASE
Transactions of the Japan Society of Mechanical Engineer, Journal of System Design and Dynamics, Volume：2, Number：1, First page：45, Last page：53, 2008
This paper describes the numerical calculations on the vibrations of a structure excited by two unbalanced rotors. When two rotors rotate on a base plate, which is free to vibrate horizontally, some kinds of vibration modes, i.e., in-phase synchronization, out-of-phase synchronization, and non-synchronization are observed. According to our investigation of rotor unbalance, we observed two types of non-synchronization. One is quasi-periodic vibration, and the other is chaos.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jsdd.2.45
DOI ID：10.1299/jsdd.2.45, ISSN：1881-3046, CiNii Articles ID：130000098862 - Stable rotation of a parametrically excited double pendulum
Takuo Nagamine; Yutchi Sato; Yoshikazu Koseki
JOURNAL OF VIBRATION AND CONTROL, Volume：13, Number：2, First page：111, Last page：124, Feb. 2007
The rotation of a double pendulum with a dc motor installed between the first and second pendulums was investigated using both experiments and numerical computations. The first pendulum can rotate freely around one end, while the second pendulum is attached to the other end of the first pendulum; the dc motor attached to the first pendulum causes the second pendulum to rotate with respect to the first pendulum. We clarify that there is a range of rotation speed in which the first pendulum rotates at the same, one-half, or one-third of the rotation speed of the second pendulum, and the stable rotation of the double pendulum is realized without torque control of the dc motor and report the characteristics of the stable rotation of the double pendulum.
SAGE PUBLICATIONS LTD, English
DOI：https://doi.org/10.1177/1077546307065580
DOI ID：10.1177/1077546307065580, ISSN：1077-5463, eISSN：1741-2986, Web of Science ID：WOS:000244646800001 - Stable rotation of a parametrically excited double pendulum
Takuo Nagamine; Yuichi Sato; Yoshikazu Koseki
JVC/Journal of Vibration and Control, Volume：13, Number：2, First page：111, Last page：124, Feb. 2007
The rotation of a double pendulum with a dc motor installed between the first and second pendulums was investigated using both experiments and numerical computations. The first pendulum can rotate freely around one end, while the second pendulum is attached to the other end of the first pendulum
the dc motor attached to the first pendulum causes the second pendulum to rotate with respect to the first pendulum. We clarify that there is a range of rotation speed in which the first pendulum rotates at the same, one-half, or one-third of the rotation speed of the second pendulum, and the stable rotation of the double pendulum is realized without torque control of the dc motor and report the characteristics of the stable rotation of the double pendulum. © 2007 SAGE Publictions.
English
DOI：https://doi.org/10.1177/1077546307065580
DOI ID：10.1177/1077546307065580, ISSN：1077-5463, SCOPUS ID：33847341203 - 縦型柔軟回転軸に発生する振動
大嶋弘志; 長嶺拓夫; 佐藤勇一
Volume：No.070, Number：1, First page：463, Last page：464, 2007 - 柔軟回転軸に発生する摩擦振動
長嶺 拓夫
Volume：第5号(18年度), First page：582, Last page：583, 2007 - Synchronizaton and Chaos of Unbalanced Rotors on a Flexible Structure
Takuo NAGAMINE; Yuichi SATO; Kousuke KAWASE; Oleksandr MIKHYEYEV
Volume：Paper No. 58, First page：1, Last page：9, 2007 - Vibration of a Flexible Shaft Caused by Friction
Korneyev SERGIY; Yuichi SATO; Takuo NAGAMINE; Koji OSHIMA
Volume：Paper No. 42, First page：1, Last page：7, 2007 - 摩擦力の作用する縦型柔軟回転軸の振動
佐藤勇一; 長嶺拓夫; 大嶋弘志
Volume：73, Number：732, First page：2182, Last page：2188, 2007
DOI：https://doi.org/10.1299/kikaic.73.2182
DOI ID：10.1299/kikaic.73.2182, ISSN：0387-5024, CiNii Articles ID：110006380474 - Behavior of a Falling Water Sheet
SATO Yuichi; MIURA Shuichi; NAGAMINE Takuo; MORII Shigeki; OHKUBO Seiji
JEE, Volume：2, Number：2, First page：394, Last page：406, 2007
This paper describes experimental and analytical study on the behavior of falling water sheets. Falling water sheet flowing over a dam sometimes oscillates. It in turn causes vibrations of paper sliding doors or windowpanes of houses in the neighborhood since its frequency is low. Experimental results shows that the frequency of water sheet is the same as that of the pressure in the air chamber. Water sheet vibration is closely related with an air chamber behind the water sheet. The vibration can be suppressed by putting a baffle at an appropriate height in an air chamber. Further, water sheet behavior is analyzed. Comparing experimental data with analytical ones we conclude that sheet vibration occurs around the conditions where the work done by the water sheet on the air chamber reaches a maximum.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jee.2.394
DOI ID：10.1299/jee.2.394, ISSN：1880-988X, CiNii Articles ID：130000076889 - Vibration Induced by Multiple Unbalanced Rigid Rotors Passing Through Critical Speed
NAGAMINE Takuo; SATO Yuichi; KAWASE Kosuke
JEE, Volume：2, Number：2, First page：381, Last page：393, 2007
Vibration characteristics of a structure on which unbalanced rigid rotors are operated are investigated experimentally and analytically. Rotor speeds cannot exceed a critical speed when drive power to each rotor is insufficient. Furthermore, the running speeds of rotors are entrained into a single speed just below the critical speed and the phases of unbalanced rotors are locked so as to excite the structure violently. On the other hand, two or three rotors operated by sufficient power supplies can run above the critical speed and unbalance forces cancel each other, that is, vibration is very small. When four rotors are operated with sufficient power supplies, the phases of unbalanced rotors are not locked for speeds above a critical speed.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jee.2.381
DOI ID：10.1299/jee.2.381, ISSN：1880-988X, CiNii Articles ID：130000076891 - 縦型柔軟回転軸に発生する振動
大嶋弘志; 長嶺拓夫; 佐藤勇一
日本機械学会関東支部第13期総会講演会講演論文集, Volume：No.070, Number：1, First page：463, Last page：464, 2007 - 柔軟回転軸に発生する摩擦振動
長嶺 拓夫
総合研究機構研究プロジェクト研究成果報告書, Volume：第5号(18年度), First page：582, Last page：583, 2007 - Synchronizaton and Chaos of Unbalanced Rotors on a Flexible Structure
Takuo NAGAMINE; Yuichi SATO; Kousuke KAWASE; Oleksandr MIKHYEYEV
Proceedings of the Asia-Pacific Vibration Conference, Volume：Paper No. 58, First page：1, Last page：9, 2007 - Vibration of a Flexible Shaft Caused by Friction
Korneyev SERGIY; Yuichi SATO; Takuo NAGAMINE; Koji OSHIMA
Proceedings of the Asia-Pacific Vibration Conference, Volume：Paper No. 42, First page：1, Last page：7, 2007 - 摩擦力の作用する縦型柔軟回転軸の振動
佐藤勇一; 長嶺拓夫; 大嶋弘志
日本機械学会論文集C編, Volume：73, Number：732, First page：2182, Last page：2188, 2007
A soot blower is used to blow off soot on tubes in a tubular heat exchanger, or a gas heater. The soot blower has a long flexible tube, that is, a lance tube, about 10 m long and 76 mm in diameter, which is put slowly into/out of a gas heater. Steam flows through the lance tube and is discharged at the free end to blow off soot. The lance tube, rotating slowly about its axis at about 12 rpm, is supported at an intermediate position by a support bearing, that is, a lance bearing. Vibrations and noises occurred in operation while a lance tube is put into a gas heater. They are considered self-excited vibrations due to friction between the lance tube and the lance bearing. Experimental study is done to clarify the mechanism of the vibration. Accordingly, backward whirling motion of a shaft is observed. Analytical study is also done which clarify the mechanism and characteristics of friction induced vibrations.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.73.2182, ISSN：0387-5024, CiNii Articles ID：110006380474, CiNii Books ID：AN00187463 - Behavior of a Falling Water Sheet
Yuichi SATO; Shuichi MIURA; Takuo NAGAMINE; Shigeki MORII; Seiji OHKUBO
Transactions of the Japan Society of Mechanical Engineer, Journal of Environment and Engineering, Volume：2, Number：2, First page：394, Last page：406, 2007
This paper describes experimental and analytical study on the behavior of falling water sheets. Falling water sheet flowing over a dam sometimes oscillates. It in turn causes vibrations of paper sliding doors or windowpanes of houses in the neighborhood since its frequency is low. Experimental results shows that the frequency of water sheet is the same as that of the pressure in the air chamber. Water sheet vibration is closely related with an air chamber behind the water sheet. The vibration can be suppressed by putting a baffle at an appropriate height in an air chamber. Further, water sheet behavior is analyzed. Comparing experimental data with analytical ones we conclude that sheet vibration occurs around the conditions where the work done by the water sheet on the air chamber reaches a maximum.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jee.2.394
DOI ID：10.1299/jee.2.394, ISSN：1880-988X, CiNii Articles ID：130000076889 - Vibration Induced by Multiple Unbalanced Rigid Rotors Passing Through Critical Speed
Takuo NAGAMINE; Yuichi SATO; Kosuke KAWASE
Transactions of the Japan Society of Mechanical Engineer, Journal of Environment and Engineering, Volume：2, Number：2, First page：381, Last page：393, 2007
Vibration characteristics of a structure on which unbalanced rigid rotors are operated are investigated experimentally and analytically. Rotor speeds cannot exceed a critical speed when drive power to each rotor is insufficient. Furthermore, the running speeds of rotors are entrained into a single speed just below the critical speed and the phases of unbalanced rotors are locked so as to excite the structure violently. On the other hand, two or three rotors operated by sufficient power supplies can run above the critical speed and unbalance forces cancel each other, that is, vibration is very small. When four rotors are operated with sufficient power supplies, the phases of unbalanced rotors are not locked for speeds above a critical speed.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jee.2.381
DOI ID：10.1299/jee.2.381, ISSN：1880-988X, CiNii Articles ID：130000076891 - 落下水膜振動の抑制に関する研究(機械力学,計測,自動制御)
三浦 秀一; 長嶺 拓夫; 佐藤 勇一; 森井 茂樹; 大久保 精二
Volume：72, Number：716, First page：1093, Last page：1099, 2006
DOI：https://doi.org/10.1299/kikaic.72.1093
DOI ID：10.1299/kikaic.72.1093 - 多数の歩行者と歩道橋の連成による振動問題
長嶺拓夫
Volume：4号, First page：289, Last page：292, 2006 - ヘルムホルツ共鳴管から発生する自励音の消音
安田太郎; 長嶺拓夫; 佐藤勇一
Volume：No.070, Number：1, First page：477, Last page：478, 2006 - 機械系の同期現象
佐藤勇一; 長嶺拓夫
Volume：No.06, Number：1, First page：437, Last page：438, 2006 - 振動ふるいに発生した振動問題
長嶺拓夫; 佐藤勇一; 原陽平
Volume：No.06, Number：7, 2006 - 多数の歩行者と歩道橋の連成による振動問題
長嶺 拓夫
Volume：第4号(17年度), 2006 - スケートボードの推進メカニズム
佐藤勇一; 長嶺拓夫; 多田裕行
Volume：72, Number：724, First page：3905, Last page：3911, 2006
DOI：https://doi.org/10.1299/kikaic.72.3905
DOI ID：10.1299/kikaic.72.3905, ISSN：0387-5024, CiNii Articles ID：110006153484 - Friction Induced Vibration of a Very Flexible Shaft Rotating Slowly
Sergiy Kornyeyev; Yuichi Sato; Takuo Nagamine
Volume：No.11, First page：491, Last page：499, 2006 - 落下水膜振動の抑制に関する研究(機械力学,計測,自動制御)
三浦 秀一; 長嶺 拓夫; 佐藤 勇一; 森井 茂樹; 大久保 精二
日本機械学會論文集. C編, Volume：72, Number：716, First page：1093, Last page：1099, 2006
DOI：https://doi.org/10.1299/kikaic.72.1093
DOI ID：10.1299/kikaic.72.1093 - 多数の歩行者と歩道橋の連成による振動問題
長嶺拓夫
埼玉大学総合研究機構研究プロジェクト研究成果報告書, Volume：4号, First page：289, Last page：292, 2006 - ヘルムホルツ共鳴管から発生する自励音の消音
安田太郎; 長嶺拓夫; 佐藤勇一
日本機械学会関東支部第13期総会講演会, Volume：No.070, Number：1, First page：477, Last page：478, 2006 - 機械系の同期現象
佐藤勇一; 長嶺拓夫
日本機械学会2006年度年次大会講演資料集, Volume：No.06, Number：1, First page：437, Last page：438, 2006 - 振動ふるいに発生した振動問題
長嶺拓夫; 佐藤勇一; 原陽平
日本機械学会機械力学・計測制御部門CD-ROM論文集, Volume：No.06, Number：7, 2006 - 多数の歩行者と歩道橋の連成による振動問題
長嶺 拓夫
総合研究機構研究プロジェクト研究成果報告書, Volume：第4号(17年度), 2006 - スケートボードの推進メカニズム
佐藤勇一; 長嶺拓夫; 多田裕行
日本機械学会論文集 C編, Volume：72, Number：724, First page：3905, Last page：3911, 2006
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.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.72.3905, ISSN：0387-5024, CiNii Articles ID：110006153484, CiNii Books ID：AN00187463 - Friction Induced Vibration of a Very Flexible Shaft Rotating Slowly
Sergiy Kornyeyev; Yuichi Sato; Takuo Nagamine
Int. J. of Applied Mechanics and Engineering, Volume：No.11, First page：491, Last page：499, 2006 - Synchronization and Its Applications
NAGAMINE Takuo; SATO Yuichi
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：71, Number：704, First page：1113, Last page：1116, 2005
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.1113, ISSN：0387-5024, CiNii Articles ID：110006264641, CiNii Books ID：AN00187463 - 振動回転子の回転速度と加振振動数
安藤芳晃; 佐藤勇一; 長嶺拓夫
Volume：50, Number：1, First page：93, Last page：94, 2005 - Stability of a Rotating Hollow Rotor Partially Filled with Liquid : Effect of Discharging Liquid by Centrifugal Force
SATO Yuichi; MORII Shigeki; NAGAMINE Takuo; ISHIKAWA Yusuke
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：71, Number：702, First page：359, Last page：365, 2005
This paper describes experimental study on the stability characteristics of a rotor partially filled with water. Constant amount of water is aupplied to the rotor continuously and is discharged radially by centrifugal force. Consequently, the rotor becomes unstable for some rotating speed range. The unstable speed range depends on the water supply rate as well as the amount of water in the rotor. Formardly traveling surface waves are also observed while the rotor undergoes an unstable orbital whirling motion. The wave travels at the same frequency as the rotor vibration frequency. As the water supply rate increases, the rotor becomes more stable.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.359, ISSN：0387-5024, CiNii Articles ID：110006264537, CiNii Books ID：AN00187463 - 水門や堰などの越流により発生する低周波音の防止装置
長嶺拓夫
First page：29, Last page：32, 2005 - ヘルムホルツ共鳴管から発生する自励音の消音
安田太郎; 長嶺拓夫; 佐藤勇一
Volume：No.060, Number：1, First page：487, Last page：488, 2005 - 不平衡ロータにより加振される構造物の非定常振動
河瀬紘介; 長嶺拓夫; 佐藤勇一
Volume：No.060, Number：1, First page：479, Last page：480, 2005 - 振動ふるいに発生した振動問題
長嶺拓夫; 佐藤勇一; 原陽平
Volume：No.060, Number：1, First page：477, Last page：478, 2005 - スケートボードの推進メカニズム
多田裕行; 長嶺拓夫; 佐藤勇一
Volume：No.060, Number：1, First page：429, Last page：430, 2005 - ゴム摺動部に発生する振動
岡野洋二; 長嶺拓夫; 佐藤勇一
Volume：No.5, Number：1, First page：252, Last page：253, 2005 - 縦型回転軸に発生する振動
大嶋弘志; 長嶺拓夫; 佐藤勇一
Volume：No.5, Number：1, First page：523, Last page：524, 2005 - 複数振動子と支持系の連成振動
長嶺拓夫; 岡田謙一朗; 大友広史; 佐藤勇一
Volume：No.6, First page：1, Last page：6, 2005 - ヘルムホルツレゾネータの消音
長嶺拓夫; 小林直晃; 安田太郎; 佐藤勇一
Volume：No.6, First page：1, Last page：5, 2005 - 出前の体験型授業と今後の試み
長嶺拓夫; 佐藤勇一
First page：444, Last page：445, 2005 - Quenching of Sounds Generated from Two Helmholtz Resonators By Use of Connecting Tube
Takuo NAGAMINE; Yuichi SATO; Sergiy KORNEYEV
Volume：Vol.1, First page：85, Last page：90, 2005 - Wire-Screen Belt Vibration in a Paper Machine
Yuichi SATO; Takuo NAGAMINE
First page：75, Last page：77, 2005 - Behavior of a Falling Water Sheet
SATO Yuichi; MIURA Shuichi; NAGAMINE Takuo; MORII Shigeki; OHKUBO Seiji
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：71, Number：709, First page：2685, Last page：2692, 2005
This paper describes experimental and analytical study on the behavior of falling water sheets. Falling water sheet flowing over a dam sometimes oscillates. It in turn causes vibrations of paper sliding doors or windowpanes of houses in the neighborhood since its frequency is low. Experimental results shows that the frequency of water sheet is the same as that of the pressure in the. air chamber. Water sheet vibration is closely related with an air chamber behind the water sheet. The vibration can be suppressed by putting a baffle at an appropriate height in an air chamber. Further, water sheet behavior is analyzed. Comparing experimental data with analytical ones we conclude that sheet vibration occurs around the conditions where the work done by the water sheet on the air chamber reaches a maximum.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.2685, ISSN：0387-5024, CiNii Articles ID：110006264851, CiNii Books ID：AN00187463 - 研究展望，同期現象とその応用，共著
長嶺拓夫; 佐藤勇一
Volume：71, Number：704, First page：1113, Last page：1116, 2005
DOI：https://doi.org/10.1299/kikaic.71.1113
DOI ID：10.1299/kikaic.71.1113, ISSN：0387-5024, CiNii Articles ID：110006264641 - Study on Energy Conversion from Vibrational to Rotational Energy by an Oscillatory Rotor
SATO Yuichi; NAGAMINE Takuo; ANDO Yoshiaki
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：71, Number：710, First page：2850, Last page：2856, 2005
This paper describes experimental and analytical study on energy conversion from vibrational energy to rotational one by an oscillatory rotor, which will rotate in one direction when it is oscillated. The characteristics of motion of an oscillatory rotor on a vibrating table are investigated experimentally. Consequently, for suitable range of exciting frequency, an oscillatory rotor rotates at an approximately constant speed. The fundamental mechanism of rotation is that the vertical vibration induces parametric oscillation of an oscillatory rotor. Then the characteristic of an oscillatory rotor converts shaking motion into rotational motion in turn.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.2850, ISSN：0387-5024, CiNii Articles ID：110006264874, CiNii Books ID：AN00187463 - Vibration Induced by Unbalanced Rigid Rotors Running Through a Critical Speed
NAGAMINE Takuo; SATO Yuichi; KAWASE Kouke
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：71, Number：708, First page：2439, Last page：2446, 2005
Vibration characteristics of a structure on which unbalanced rigid rotors are operated are investigated experimentally and analytically. Rotor speeds cannot exceed a critical speed when drive power to each rotor is not enough. Further running speeds of rotors are entrained into a single speed just below the critical speed and phases of rotor unbalance are locked so as to excite the structure violently. On the other hand, two or three rotors operated by sufficient power supplies can run above the critical speed and unbalance forces cancel each other, that is, vibration is very small. When four rotors are operated with enough power supplies, the phases of rotor unbalance are not locked for speeds above a critical speed.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.2439, ISSN：0387-5024, CiNii Articles ID：110006264818, CiNii Books ID：AN00187463 - 2本の共鳴管から発生する自励音の消音,共著
長嶺拓夫; 佐藤勇一; 名取信彦
Volume：61, Number：9, First page：507, Last page：515, 2005
DOI：https://doi.org/10.20697/jasj.61.9_507
DOI ID：10.20697/jasj.61.9_507 - 同期現象とその応用
長嶺 拓夫; 佐藤 勇一
日本機械学會論文集. C編, Volume：71, Number：704, First page：1113, Last page：1116, 2005
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.1113, ISSN：0387-5024, CiNii Articles ID：110006264641, CiNii Books ID：AN00187463 - 振動回転子の回転速度と加振振動数
安藤芳晃; 佐藤勇一; 長嶺拓夫
日本機械学会関東支部講演論文集, Volume：50, Number：1, First page：93, Last page：94, 2005 - 液体を内蔵する中空回転体の安定性 : 液体が遠心力によって排出される影響
佐藤 勇一; 長嶺 拓夫; 石川 裕亮; 森井 茂樹
日本機械学會論文集. C編, Volume：71, Number：702, First page：359, Last page：365, 2005
This paper describes experimental study on the stability characteristics of a rotor partially filled with water. Constant amount of water is aupplied to the rotor continuously and is discharged radially by centrifugal force. Consequently, the rotor becomes unstable for some rotating speed range. The unstable speed range depends on the water supply rate as well as the amount of water in the rotor. Formardly traveling surface waves are also observed while the rotor undergoes an unstable orbital whirling motion. The wave travels at the same frequency as the rotor vibration frequency. As the water supply rate increases, the rotor becomes more stable.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.359, ISSN：0387-5024, CiNii Articles ID：110006264537, CiNii Books ID：AN00187463 - 水門や堰などの越流により発生する低周波音の防止装置
長嶺拓夫
首都圏四大学発新技術説明発表会資料, First page：29, Last page：32, 2005 - ヘルムホルツ共鳴管から発生する自励音の消音
安田太郎; 長嶺拓夫; 佐藤勇一
日本機械学会関東支部第12期総会講演論文集, Volume：No.060, Number：1, First page：487, Last page：488, 2005 - 不平衡ロータにより加振される構造物の非定常振動
河瀬紘介; 長嶺拓夫; 佐藤勇一
日本機械学会関東支部第12期総会講演会, Volume：No.060, Number：1, First page：479, Last page：480, 2005 - 振動ふるいに発生した振動問題
長嶺拓夫; 佐藤勇一; 原陽平
日本機械学会関東支部第12期総会講演会, Volume：No.060, Number：1, First page：477, Last page：478, 2005 - スケートボードの推進メカニズム
多田裕行; 長嶺拓夫; 佐藤勇一
日本機械学会関東支部第12期総会講演会, Volume：No.060, Number：1, First page：429, Last page：430, 2005 - ゴム摺動部に発生する振動
岡野洋二; 長嶺拓夫; 佐藤勇一
日本機械学会年次大会講演論文集, Volume：No.5, Number：1, First page：252, Last page：253, 2005 - 縦型回転軸に発生する振動
大嶋弘志; 長嶺拓夫; 佐藤勇一
日本機械学会年次大会講演論文集, Volume：No.5, Number：1, First page：523, Last page：524, 2005 - 複数振動子と支持系の連成振動
長嶺拓夫; 岡田謙一朗; 大友広史; 佐藤勇一
日本機械学会機械力学・計測制御部門CD-ROM講演論文集, Volume：No.6, First page：1, Last page：6, 2005 - ヘルムホルツレゾネータの消音
長嶺拓夫; 小林直晃; 安田太郎; 佐藤勇一
日本機械学会 機械力学・計測制御部門CD-ROM講演論文集, Volume：No.6, First page：1, Last page：5, 2005 - 出前の体験型授業と今後の試み
長嶺拓夫; 佐藤勇一
日本工学教育協会 工学・工業教育研究講演論文集, First page：444, Last page：445, 2005 - Quenching of Sounds Generated from Two Helmholtz Resonators By Use of Connecting Tube
Takuo NAGAMINE; Yuichi SATO; Sergiy KORNEYEV
Proceedings of the Asia-Pasific Vibration Conference, Volume：Vol.1, First page：85, Last page：90, 2005 - Wire-Screen Belt Vibration in a Paper Machine
Yuichi SATO; Takuo NAGAMINE
Proceedings of the Fifth International Symposium on Vibrations of Continuous Sytems, First page：75, Last page：77, 2005 - 落下水膜の挙動に関する研究,共著
佐藤勇一; 三浦秀一; 長嶺拓夫; 森井茂樹; 大久保精二
日本機械学会論文集, Volume：71, Number：709, First page：2685, Last page：2692, 2005
This paper describes experimental and analytical study on the behavior of falling water sheets. Falling water sheet flowing over a dam sometimes oscillates. It in turn causes vibrations of paper sliding doors or windowpanes of houses in the neighborhood since its frequency is low. Experimental results shows that the frequency of water sheet is the same as that of the pressure in the. air chamber. Water sheet vibration is closely related with an air chamber behind the water sheet. The vibration can be suppressed by putting a baffle at an appropriate height in an air chamber. Further, water sheet behavior is analyzed. Comparing experimental data with analytical ones we conclude that sheet vibration occurs around the conditions where the work done by the water sheet on the air chamber reaches a maximum.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.2685, ISSN：0387-5024, CiNii Articles ID：110006264851, CiNii Books ID：AN00187463 - 研究展望，同期現象とその応用，共著
長嶺拓夫; 佐藤勇一
日本機械学会論文集, Volume：71, Number：704, First page：1113, Last page：1116, 2005
DOI：https://doi.org/10.1299/kikaic.71.1113
DOI ID：10.1299/kikaic.71.1113, ISSN：0387-5024, CiNii Articles ID：110006264641 - 振動回転子による振動エネルギー回生の試み，共著
佐藤勇一; 長嶺拓夫; 安藤芳晃
日本機械学会論文集, Volume：71, Number：710, First page：2850, Last page：2856, 2005
This paper describes experimental and analytical study on energy conversion from vibrational energy to rotational one by an oscillatory rotor, which will rotate in one direction when it is oscillated. The characteristics of motion of an oscillatory rotor on a vibrating table are investigated experimentally. Consequently, for suitable range of exciting frequency, an oscillatory rotor rotates at an approximately constant speed. The fundamental mechanism of rotation is that the vertical vibration induces parametric oscillation of an oscillatory rotor. Then the characteristic of an oscillatory rotor converts shaking motion into rotational motion in turn.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.2850, ISSN：0387-5024, CiNii Articles ID：110006264874, CiNii Books ID：AN00187463 - 複数回転機械の危険速度通過振動,共著
長嶺拓夫; 佐藤勇一; 河瀬紘介
日本機械学会論文集, Volume：71, Number：708, First page：2439, Last page：2446, 2005
Vibration characteristics of a structure on which unbalanced rigid rotors are operated are investigated experimentally and analytically. Rotor speeds cannot exceed a critical speed when drive power to each rotor is not enough. Further running speeds of rotors are entrained into a single speed just below the critical speed and phases of rotor unbalance are locked so as to excite the structure violently. On the other hand, two or three rotors operated by sufficient power supplies can run above the critical speed and unbalance forces cancel each other, that is, vibration is very small. When four rotors are operated with enough power supplies, the phases of rotor unbalance are not locked for speeds above a critical speed.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.71.2439, ISSN：0387-5024, CiNii Articles ID：110006264818, CiNii Books ID：AN00187463 - 2本の共鳴管から発生する自励音の消音,共著
長嶺拓夫; 佐藤勇一; 名取信彦
日本音響学会誌, Volume：61, Number：9, First page：507, Last page：515, 2005
本研究では, 2本のヘルムホルツ型共鳴管に発生する自励音を相互に干渉させることにより消音させる可能性について検討している。音を干渉させて消音するためには, 振動数を一致させお互いを逆位相にすることが必要となる。そこで振動数を一致させ位相を保持するために同期現象を用いる。同期現象を起こすには相互作用が必要となるため, ここでは音響的な相互作用を利用する。実験的に, 同位相あるいは逆位相同期となる条件を検討した。その結果, 自励音の位相は共鳴管を接続する管の長さによることを明らかにした。
The Acoustical Society of Japan (ASJ), Japanese
DOI ID：10.20697/jasj.61.9_507, ISSN：0369-4232, CiNii Articles ID：110003143621, CiNii Books ID：AN00186234 - 電磁力駆動される複数の自律振動子に発生する振動パターンと相互作用，共著
長嶺拓夫; 佐藤勇一; 国眼太郎
Volume：12, Number：3, First page：212, Last page：217, 2004 - 複数回転機械の危険速度通過振動
河瀬紘介; 長嶺拓夫; 佐藤勇一
Volume：4, Number：5, 2004 - 落下水膜の挙動に関する研究
三浦秀一; 佐藤勇一; 長嶺拓夫; 大久保精二; 勝浦啓
Volume：4, Number：5, 2004 - 多数振動子における振動パターン
長嶺拓夫; 佐藤勇一
Volume：4, Number：5, 2004 - 複数振動子と支持系の連成振動
岡田謙一朗; 長嶺拓夫; 佐藤勇一
Volume：4, Number：5, 2004 - 重力と振動を利用した移動機構：教材
長嶺拓夫; 保野秀久; 佐藤勇一
First page：99, Last page：100, 2004 - 複数振動子の同期現象
佐藤勇一; 長嶺拓夫
First page：B1-B6, 2004 - 電磁力駆動される複数の自律振動子に発生する振動パターンと相互作用
長嶺拓夫; 佐藤勇一; 国眼太郎
First page：375, Last page：380, 2004 - 液体を内蔵する回転体の動特性
石川裕亮; 長嶺拓夫; 佐藤勇一; 森井茂樹
Volume：40-1, First page：575, Last page：576, 2004 - 相互作用を受ける複数振動子の特性
国眼太郎; 長嶺拓夫; 佐藤勇一
Volume：40-1, First page：451, Last page：452, 2004 - Friction Induced Vibrations of a Long Flexible Shaft : Experimental Study
SATO Yuichi; NAGAMINE Takuo; NAGAI Jun'ichi; KATAYAMA Keiichi
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：70, Number：690, First page：356, Last page：362, 2004
A soot blower is used to blow off soot on tubes in a tubular heat exchanger, or a gas heater. The soot blower has a long flexible tube, that is, a lance tube, 8 m long and 76.2 mm in diameter, which is put slowly into/out of a gas heater. Steam flows through the lance tube and is discharged at the free end to blow off soot. The lance tube, rotating slowly about its axis at about 12 rpm, is supported at an intermediate position by a support bearing, that is, a lance bearing. Vibrations and noises occurred in operation while a lance tube is being put into a gas heater slowly. They are considered self-excited vibrations due to friction between the lance tube and the lance bearing. From frequency analysis dominant frequencies of the observed vibrations are the eighth to tenth natural frequencies. Experimental study is done to clarify the mechanism of the vibration. Accordingly, backward whirling motion of a shaft is observed. As the clearance between the flexible shaft and the circular support is reduced, higher modes appear.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.70.356, ISSN：0387-5024, CiNii Articles ID：110006263751, CiNii Books ID：AN00187463 - 電磁力駆動される複数の自律振動子に発生する振動パターンと相互作用，共著
長嶺拓夫; 佐藤勇一; 国眼太郎
日本AEM学会論文集, Volume：12, Number：3, First page：212, Last page：217, 2004 - 複数回転機械の危険速度通過振動
河瀬紘介; 長嶺拓夫; 佐藤勇一
日本機械学会機械力学・計測制御部門講演論文集, Volume：4, Number：5, 2004 - 落下水膜の挙動に関する研究
三浦秀一; 佐藤勇一; 長嶺拓夫; 大久保精二; 勝浦啓
日本機械学会機械力学・計測制御部門講演論文集, Volume：4, Number：5, 2004 - 多数振動子における振動パターン
長嶺拓夫; 佐藤勇一
日本機械学会機械力学・計測制御部門講演論文集, Volume：4, Number：5, 2004 - 複数振動子と支持系の連成振動
岡田謙一朗; 長嶺拓夫; 佐藤勇一
日本機械学会機械力学・計測制御部門講演論文集, Volume：4, Number：5, 2004 - 重力と振動を利用した移動機構：教材
長嶺拓夫; 保野秀久; 佐藤勇一
日本機械学会関東支部講演論文集, First page：99, Last page：100, 2004 - 複数振動子の同期現象
佐藤勇一; 長嶺拓夫
日本機械学会非線形振動研究会, First page：B1-B6, 2004 - 電磁力駆動される複数の自律振動子に発生する振動パターンと相互作用
長嶺拓夫; 佐藤勇一; 国眼太郎
日本ＡＥＭ学会ＭＡＧＤＡ講演論文集, First page：375, Last page：380, 2004 - 液体を内蔵する回転体の動特性
石川裕亮; 長嶺拓夫; 佐藤勇一; 森井茂樹
日本機械学会関東支部講演論文集, Volume：40-1, First page：575, Last page：576, 2004 - 相互作用を受ける複数振動子の特性
国眼太郎; 長嶺拓夫; 佐藤勇一
日本機械学会関東支部講演論文集, Volume：40-1, First page：451, Last page：452, 2004 - 摩擦力の作用する柔軟回転軸の振動 実験
佐藤 勇一; 長嶺 拓夫; 永井 純一; 片山 圭一
日本機械学會論文集. C編, Volume：70, Number：690, First page：356, Last page：362, 2004
A soot blower is used to blow off soot on tubes in a tubular heat exchanger, or a gas heater. The soot blower has a long flexible tube, that is, a lance tube, 8 m long and 76.2 mm in diameter, which is put slowly into/out of a gas heater. Steam flows through the lance tube and is discharged at the free end to blow off soot. The lance tube, rotating slowly about its axis at about 12 rpm, is supported at an intermediate position by a support bearing, that is, a lance bearing. Vibrations and noises occurred in operation while a lance tube is being put into a gas heater slowly. They are considered self-excited vibrations due to friction between the lance tube and the lance bearing. From frequency analysis dominant frequencies of the observed vibrations are the eighth to tenth natural frequencies. Experimental study is done to clarify the mechanism of the vibration. Accordingly, backward whirling motion of a shaft is observed. As the clearance between the flexible shaft and the circular support is reduced, higher modes appear.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.70.356, ISSN：0387-5024, CiNii Articles ID：110006263751, CiNii Books ID：AN00187463 - Synchronized Phenomena of Oscillators (Experimental and Analytical Investigation for Two MMetronomes)
SATO Yuichi; NAKANO Ken; NAGAMINE Takuo; FUSE Makoto
Transactions of the Japan Society of Mechanical Engineers. Series C., Volume：66, Number：642, First page：363, Last page：369, 2000
This paper describes experimental and analytical investigation on synchronized phenomena conducted with two metronomes on a base plate suspended by four wires. Two modes of synchronized phenomena, i.e., in-phase synchronization and out-of-phase synchronization, are experimentally observed. The synchronization mode and frequency in synchronization is strongly influenced by the natural frequency of the base plate. Calculated results based on a physical model of the experimental apparatus show good agreement with the experimental ones, not only qualitively but also quantitatively.
The Japan Society of Mechanical Engineers, Japanese
DOI ID：10.1299/kikaic.66.363, ISSN：0387-5024, CiNii Articles ID：110002382924, CiNii Books ID：AN00187463 - 振動系の同期現象 : 2台のメトロノームを対象とした実験と解析
佐藤 勇一; 中野 健; 長嶺 拓夫; 布施 誠
日本機械学會論文集. C編, Volume：66, Number：642, First page：363, Last page：369, 2000
DOI：https://doi.org/10.1299/kikaic.66.363
DOI ID：10.1299/kikaic.66.363, ISSN：0387-5024, CiNii Articles ID：110002382924 - 遠心力利用強制渦方式分級機の分級メカニズムに関する基礎的研究（第3報，風量および羽根形状の分級径に及ぼす影響），共著
佐藤 勇一; 長嶺 拓夫; 山田 幸良
Volume：27, Number：4, First page：225, Last page：230, 1990
Japanese
DOI ID：10.4164/sptj.27.225, ISSN：0386-6157, CiNii Articles ID：40004190130, CiNii Books ID：AN00222757 - 遠心力利用強制渦方式分級機の分級メカニズムに関する基礎的研究（第3報，風量および羽根形状の分級径に及ぼす影響），共著
Yuichi SATO; Takuo NAGAMINE; Yukiyoshi YAMADA
粉体工学会誌, Volume：27, Number：4, First page：225, Last page：230, 1990
Japanese
DOI ID：10.4164/sptj.27.225, ISSN：0386-6157, CiNii Articles ID：40004190130, CiNii Books ID：AN00222757 - 遠心力利用強制渦方式分級機の分級メカニズムに関する基礎的研究（第2報，分級精度に及ぼす諸要因の数値解析），共著
佐藤勇一; 長嶺拓夫; 山田幸良
Volume：25, Number：7, First page：443, Last page：450, 1988
Japanese
DOI ID：10.4164/sptj.25.443, ISSN：0386-6157, CiNii Articles ID：40004189870, CiNii Books ID：AN00222757 - 遠心力利用強制渦方式分級機の分級メカニズムに関する基礎的研究（第2報，分級精度に及ぼす諸要因の数値解析），共著
佐藤 勇一; 長嶺 拓夫; 山田 幸良
粉体工学会誌, Volume：25, Number：7, First page：443, Last page：450, 1988
Japanese
DOI ID：10.4164/sptj.25.443, ISSN：0386-6157, CiNii Articles ID：40004189870, CiNii Books ID：AN00222757
■ Lectures, oral presentations, etc.
- 同期現象による吊橋状構造物の振動
2008
Poster presentation - 振動ふるいに起こる振動問題
2008
Poster presentation - キャスティング動作による物体の搬送
2008 - 複数振動子による吊橋振動
2008 - 吊り橋上の自励振動子による水平方向振動
2008 - 円柱近傍に置かれた弾性棒に発生する振れ回り現象に関する研究
2008 - 振動ふるいに起る自励振動
2008 - 同期現象による吊橋状構造物の振動
第7回評価・振動に関するシンポジウム講演論文集, 2008
Poster presentation - 振動ふるいに起こる振動問題
第7回評価・振動に関するシンポジウム講演論文集, 2008
Poster presentation - キャスティング動作による物体の搬送
日本機械学会機械力学・計測制御部門D&D2008 CD-ROM講演論文集, 2008 - 複数振動子による吊橋振動
日本機械学会機械力学・計測制御部門D&D2008 CD-ROM講演論文集, 2008 - 吊り橋上の自励振動子による水平方向振動
日本機械学会関東支部第14期総会講演会講演論文集, 2008 - 円柱近傍に置かれた弾性棒に発生する振れ回り現象に関する研究
日本機械学会関東支部第14期総会講演会講演論文集, 2008 - 振動ふるいに起る自励振動
日本機械学会2008年度年次大会講演論文集, 2008 - 円柱近傍に配置された弾性棒の振動
2007 - 複数振動子と構造物の連成振動
2007 - 複数振動子の引き込み現象による構造物の振動
2007 - Synchronizaton and Chaos of Unbalanced Rotors on a Flexible Structure
2007 - Vibration of a Flexible Shaft Caused by Friction
2007 - 地域貢献と教材開発
2007 - 円柱近傍に配置された弾性棒の振動
機械力学・計測制御部門CD-ROM論文集, 2007 - 複数振動子と構造物の連成振動
日本機械学会機械力学・計測制御部門CD-ROM論文集, 2007 - 複数振動子の引き込み現象による構造物の振動
関東支部ブロック合同講演会講演文集, 2007 - Synchronizaton and Chaos of Unbalanced Rotors on a Flexible Structure
Proceedings of the Asia-Pacific Vibration Conference, 2007 - Vibration of a Flexible Shaft Caused by Friction
Proceedings of the Asia-Pacific Vibration Conference, 2007 - 地域貢献と教材開発
工学・工業教育研究講演会講演論文集, 2007 - 振動ふるいに発生した振動問題
2006 - ヘルムホルツ共鳴管から発生する自励音の消音
2006 - 不平衡ロータにより加振される構造物の非定常振動
2006 - 振動ふるいに発生した振動問題
2006 - スケートボードの推進メカニズム
2006 - 振動ふるいに発生した振動問題
日本機械学会機械力学・計測制御部門CD-ROM論文集, 2006 - ヘルムホルツ共鳴管から発生する自励音の消音
関東支部第12期講演論文集, 2006 - 不平衡ロータにより加振される構造物の非定常振動
関東支部第12期総会講演論文集, 2006 - 振動ふるいに発生した振動問題
関東支部第12期総会講演論文集, 2006 - スケートボードの推進メカニズム
関東支部第12期総会講演論文集, 2006 - Quenching of Sounds Generated from Two Helmholtz Resonators by Use of Conneciting Tube
2005 - ゴム摺動部に発生する振動
2005 - 柔軟回転軸に発生する振動
2005 - 出前の体験型授業と今後の試み
2005 - ヘルムホルツレゾネータの消音
2005 - 複数振動子と支持系の連成振動
2005 - Quenching of sounds generated from two Helmholtz resonators by use of a connectiong tube
2005 - Wire-screen belt vibrations in a paper machine
2005 - Quenching of Sounds Generated from Two Helmholtz Resonators by Use of Conneciting Tube
Proceedings of the Asia-Pasific Vibration Conference, 2005 - ゴム摺動部に発生する振動
年次大会講演論文集, 2005 - 柔軟回転軸に発生する振動
年次大会講演論文集, 2005 - 出前の体験型授業と今後の試み
工学・工業教育研究講演論文集, 2005 - ヘルムホルツレゾネータの消音
D&D2005 機械力学・計測制御部門CD-ROM講演論文集, 2005 - 複数振動子と支持系の連成振動
D&D2005 機械力学・計測制御部門 CD-ROM講演論文集, 2005 - Quenching of sounds generated from two Helmholtz resonators by use of a connectiong tube
Proceedings of the Asia-Pacific Vibration Conference, 2005 - Wire-screen belt vibrations in a paper machine
Proceedings of the Fifth International Symposium on Vibrations of Continuous Systems, 2005 - 多数振動子における振動パターン
2004 - 複数振動子の同期現象
2004 - 電磁力駆動される複数自律振動子に発生する振動パターンと相互作用
2004
Poster presentation - 多数振動子における振動パターン
日本機械学会機械力学・計測制御講演論文集, 2004 - 複数振動子の同期現象
日本機械学会非線形振動研究会平成16年非線形振動研究会概要集, 2004 - 電磁力駆動される複数自律振動子に発生する振動パターンと相互作用
日本ＡＥＭ学会第１３回ＭＡＧＤＡコンファレンス講演論文集, 2004
Poster presentation - Simplified Model of a Giant Swing and Its Motion Mechanism
2001 - Simplified Model of a Giant Swing and Its Motion Mechanism
Proceedings of International Conference on Biomechanics combined with the Annual Scientific Meeting, 2001 - On Synchronization of Two Unbalanced Rotors
1999 - On Synchronization of Two Unbalanced Rotors
Proceedings of the Aisa-Pacific Vibration Conference, 1999