論文

公開件数: 23 件
No. 掲載種別 単著・共著区分 タイトル 著者 誌名 出版者 巻号頁 出版日 ISSN DOI URL 概要
1 研究論文(国際会議プロシーディングス)
共著
The Relationship between Sound and Rainwater Quality Purification Using Waterwheel Rotation
Akira HIRATSUKA, Yugo TOMONAGA(Ryukoku Univ.), Akitaka IMAMURA(Osaka Sangyo Univ.) and Ryoji TSUJINO(Niigata Univ.)
The 13th International Symposium on Advanced Science and Technology in Experimental Mechanics (13th ISEM'18)

A07119
2018/10/30



Sustainable water resource conservation is now essential to secure sustained, sound, and high-quality water in the world. In this paper, a raiwater quality purification using waterwheel rotation was first considered through the experiment. Next, the relationship between the sound wave and the rainwater quality pulification using the device is stated. Finally, a consideration regarding sustainable environmental management and a water resouce purification has been described in the paper.
2 研究論文(学術雑誌)
共著
Arbitrary Attitude Hovering Control of Quad Tilt Rotor Helicopter
Masafumi Miwa (Tokushima Univ.), Shinji Uemura (Fuji Imvac), and Akitaka Imamura (Osaka Sangyo Univ.)
Journal of Robotics and Mechatronics

Vol.28/ No.3, pp. 328-333
2016/06



The quad tilt rotor helicopter (QTRH), a tilt-rotor aircraft prototype, has fixed wings for long-range high-speed flight. Its rotor-tilt mechanism controls 4 rotor-tilt angles independently and controls its roll and pitch angles similarly to a multirotor helicopter. It controls yaw angle by thrust vectoring and moves forward and backward by tilting its rotors. Rotor-tilting maneuvers are the initial stage of flight-mode transition between helicopter and fixed-wing modes.
3 研究論文(学術雑誌)
共著
Flight Characteristics of Quad Rotor Helicopter with Thrust Vectoring Equipment
Akitaka Imamura (Osaka Sangyo Univ.), Masafumi Miwa (Tokushima Univ.), and Junichi Hino (Tokushima Univ.)
Journal of Robotics and Mechatronics

Vol.28/ No.3, pp. 334-342
2016/06



A quad rotor helicopter (QRH) is a radio controlled (RC) aircraft that tilts its attitude to generate a horizontal force component to move in a certain direction. Using autonomous control, the attitude control system tilts the airframe against disturbances, such as wind. Thus, the attitude of a flying QRH is always slanted. In this study, three types of deflecting thruster were compared to maintain the position and horizontal attitude of the QRH. The extra thrusters are tilted to generate a thrust against disturbances without causing the airframe to incline. It is suitable for precise measurements for which the airframe posture should remain horizontal.
4 研究論文(学術雑誌)
共著
Flight Characteristics of a Quadrotor Helicopter Using Extra Deflecting
Akitaka Imamura (Osaka Sangyo Univ.), Masafumi Miwa (Tokushima Univ.), Junichi Hino (Tokushima Univ.)
The Journal of Instrumentation, Automation and Systems

1/ 2, 64-71
2014/11



A quadrotor helicopter (QRH) tilts its attitude to generate a horizontal force component to move in a direction. With autonomous control, the attitude control system tilts the airframe against disturbances such as wind. Thus, the attitude of a flying QRH is always slanted. In this study, extra thruster rotors were mounted to maintain the position and horizontal attitude of the QRH.
5 研究論文(学術雑誌)
共著
Flight Characteristics of Quad Rotor Helicopter with Tilting Rotor
Akitaka Imamura (Osaka Sangyo Univ.), Yasuyuki Urashiri (Japan Remote Control), Masafumi Miwa (Tokushima Univ.), Junichiro Hino (Tokushima Univ.)
The Journal of Instrumentation, Automation and Systems

1/ 2, 56-63
2014/11



A quad rotor helicopter (QRH) uses a tilted attitude to generate a horizontal thrust component in the flying direction. The attitude control system is used to tilt the airframe against disturbances such as crosswinds. Consequently, the flying attitude of a QRH is always inclined. In this study, a tilting mechanism for rotors (TMR) was mounted on a QRH to maintain a horizontal attitude.
6 (MISC)総説・解説(国際会議プロシーディングズ)
共著
Flight Characteristics of Quad Rotor Helicopter with Tilting Rotor
Akitaka Imamura (Osaka Sangyo Univ.), Yasuyuki Urashiri (Japan Remoto Control), Masafumi Miwa (Tokushima Univ.), Junichi Hino (Tokushima Univ.)
The 10th International Conference on Intelligent Unmanned Systems

156
2014/09



A quad rotor helicopter (QRH), a type of unmanned aerial vehicle (UAV), uses a tilted attitude to generate a horizontal thrust component in the flying direction. In the case of autonomous control, the attitude control system is used to tilt the airframe against disturbances such as crosswinds. Consequently, the flying attitude of a QRH is always inclined. In this study, a tilting mechanism for rotors (TMR) was mounted on a QRH to maintain a horizontal attitude. The TMRs were tilted to generate thrust against disturbances without inclining the airframe. The system was constructed using a QRH and TMRs tilted around only one axis and allocated every 90°. Because the airframe is always horizontal, this system can be used for the precise measurement of, e.g., landforms and buildings.
7 研究論文(学術雑誌)
共著
Flight Characteristics of Quad Ducted Fan Helicopter with Thrust Vectoring Nozzles
Akitaka Imamura (Osaka Sangyo Univ.), Shinji Uemura (Tokushima Univ.), Masafumi Miwa (Tokushima Univ.) and Junichi Hino (Tokushima Univ.)
The Journal of Unmanned System Technology

2/ 1, 54-61
2014/06



As an unmanned aerial vehicle (UAV), a quad rotor helicopter (QRH) uses a tilted attitude to generate a horizontal thrust component in the flying direction. The attitude control system is used to tilt the airframe against disturbances such as crosswinds. In this study, thrust vectoring nozzles (TVNs) were mounted on a quad ducted fan helicopter (QDH) to maintain a horizontal attitude.
8 研究論文(学術雑誌)
共著
Quad Rotor Helicopter Control with Humanoid Robot
Masafumi Miwa (Tokushima Univ.), Kunou Shingo (Tokushima Univ.), Akitaka Imamura (Osaka Sangyo Univ.), Hirofumi Niimi (Tokushima Univ.)
The Journal of Unmanned System Technology

2/ 1, 40-47
2014/06



We propose a new control method using an external input to P attitude control system of Quad Rotor Helicopter (QRH). We set a humanoid robot on the center of experimental QRH. When the humanoid robot takes a step forward, this motion causes the shift of center of gravity (COG), and it causes the attitude change of QRH. Then attitude control system generates counter torque to cancel the tilt angle.
9 (MISC)総説・解説(国際会議プロシーディングズ)
共著
Quad Rotor Helicopter Control with Humanoid Robot
M. Miwa (Tokushima Univ.), S. Kunou (Tokushima Univ.), A. Imamura (Osaka Sangyo Univ.), H. Niimi (Tokushima Univ.)
The 9th International Conference on Intelligent Unmanned Systems

133
2013/09



In this study, we propose a new control method using an external input to PD attitude control system of Quad-Rotor Helicopter (QRH). We set a humanoid robot on the center of experimental QRH. When the humanoid robot takes a step forward, this motion causes the shift of center of gravity (COG), and it causes the attitude change of QRH. Then attitude control system generates counter torque to cancel the tilt angle. As the result, small inclination exists. This small inclination generates moving thrust, and QRH starts to slide. This result means that we can control QRH with external independent devices attached on it.
10 (MISC)総説・解説(国際会議プロシーディングズ)
共著
Flight Characteristic of Quad Ducted fan Helicopter with Thrust Vectoring Nozzles
Akitaka Imamura1, Shinji Uemura2, Masafumi Miwa2 and Junichi Hino2
1 Department of Electronics, Information and Communication Engineering,
Osaka Sangyo University
2 Institute of Technology and Science,
The University of Tokushima, Tokushima
The 9th International Conference on Intelligent Unmanned Systems

034
2013/09



As UAV, Quad Rotor Helicopter (QRH) is tilted its attitude to generate horizontal force component for moving direction. In the case of autonomous control, attitude control system tilts the airframe against to the disturbance such as wind. As a result, the attitude of flying QRH always slants. In this study, Thrust Vectoring Nozzles (TVN) are mounted to keep the position and horizontal attitude of Quad Ducted fan Helicopter (QDH). TVN are tilted to generate thrust against to the disturbance without airframe inclination. This system is constructed with QDH and VTN which can slant by two axes. Because the airframe is kept the horizontal, it is suitable for a precise measurement.
11 研究論文(学術雑誌)
共著
Attitude Control of Quad-Rotor Helicopter with COG Shift
Masafumi Miwa (Tokushima Unuv.), Kunou Shingo (Tokushima Unuv.), Shinji Uemura (Tokushima Unuv.), Akitaka Imamura (Osaka Sangyo Univ.), Hirofumi Niimi (Tokushima Univ.)
Journal of the Japanese Society for Experimental Mechanics

13/ Special Issue 2013, pp. s102-s107
2013/08



In this study, we set a single arm robot and load mass on the center of experimental Quad Rotor Helicopter (QRH). When the robot arm tilts in small angle (~30 degrees), this motion generates load torque to tilt the airframe of QRH, and then attitude control system generates counter torque to cancel the tilt angle. As the result, small inclination exists when counter torque balances to load torque. This small inclination generates moving thrust, and QRH starts to slide. This result means that we can control QRH with external independent devices attached on it.
12 研究論文(学術雑誌)
共著
Evaluation of quad ducted-fan helicopter
M. Miwa (Tokushima Univ.), S. Uemura (Tokushima Univ.), Y. Ishihara (Tokushima Univ.), A. Imamura (Osaka Sangyo Univ.), J.-H.Shim (Koria Maritime Univ,), K. Ioi (Kinki Univ.)
The International Journal of Intelligent Unmanned Systems

1/ 2, pp.187-198
2013/04



With the purpose of clearing up the risk to rotor blades, this paper develops a quad ducted-fan helicopter using four ducted-fans instead of four rotor blades in a quad rotor helicopter. Auto hoverring test, auto cruise test, and altitude control quad rotor helicopter, and it aucceeds to decrease the risk to the rotor blade, However, endurance is shorter than that of the quad rotor helicopter, because of the ducted-fan characteristics.
13 (MISC)総説・解説(国際会議プロシーディングズ)
共著
Attitude Control of Quad Ducted-Fan Helicopter
Masafumi Miwa1, Shinji Uemura1, Yasuyuki Ishihara1, Joon-hwan Shim2,
Akitaka Imamura3 and Kiyoshi Ioi4
1The University of Tokushima, 2Korea Maritime University, 3Osaka Sangyo University, 4Kinki University
The 8th International Conference on Intelligent Unmanned Systems

pp.280-284
2012/10



Recently, R/C single/multi rotor helicopter is used in fields of aerial photography and aerial investigation. But helicopter rotor blades are not covered, and the thrust is generated by high rotational speed. Thus R/C helicopter has a high risk of damage. In this study, we develop a new flying object using 4 ducted-fans instead of 4 rotor blades for quad rotor helicopter.
14 (MISC)総説・解説(国際会議プロシーディングズ)
共著
EXTRA THRUSTER FOR QUAD ROTOR HELICOPTER
Akitaka Imamura1, Masafumi Miwa2, Junichi Hino2 and Joon-Hwan Shim3
1Osaka Sangyo University, 2The University of Tokushima, 3Korea Maritime University
The 8th International Conference on Intelligent Unmanned Systems

pp.587-591
2012/10



In the case of autonomous control, attitude control system tilts the airframe against to the disturbance such as wind. As a result, the attitude of flying QRH always slants. In this study, extra thruster rotors are mounted to keep the position and horizontal attitude of QRH. This system is constructed with two ducted fans which can slant by two axes.
15 (MISC)総説・解説(大学・研究所紀要)
共著
チャープ搬送波を用いるCDMA通信システム
今村彰隆, 森中力, 佐藤正志
大阪産業大学論集 自然科学編

116, 19-31
2005/02



DS-CDMAにおける多元接続性の改善については種々の方式が提案されているが,本研究では,搬送波に周波数掃引信号であるチャープ波を用いるシステムを提案している.提案システムの特徴は,受信側で複雑な符号同期システムを必要としない点,さらにチャープ搬送波によって相関特性が改善される点が挙げられる.システム構成の特徴としては,送信側で分散性チャープフィルタを用意し,受信側では圧縮性チャープフィルタを用意するが,このインパルス応答に予め拡散符号を乗算しておく点にある.
16 研究論文(学術雑誌)
共著
Lock-in time characteristics of double correlator delay lock loop
S. Kishibe, A Imamura, M. Sato
Electronics and Communications in Japan (Part III: Fundamental Electronic Science)

85/ 2, 43-51
2002/02




17 研究論文(学術雑誌)
共著
2重相関器型DLLの同期特性
岸部真一,今村彰隆,佐藤正志
電子情報通信学会論文誌A

J83-A/ 05, 568-575
2000/05



スペクトル拡散通信方式の同期追跡システムとして、遅延同期ループ(DLL)が従来から広く用いられている。しかし、符号分割多元接続(CDMA)を行う際、同時通信中の他局信号が干渉波として存在し、DLLでは定常位相誤差が生じるために相関出力が低下し、その結果誤り率特性等が劣化する。そこで、本論文では、この定常位相誤差を除去することができる同期システムとして、2重相関器型DLLを提案し、同期するまでに必要な時間(同期時間)と、雑音のために同期状態から同期が外れるまでにかかる平均時間(平均同期外れ時間)の理論式を導出し、これらの式を用いて2重相関器型DLLの同期特性についての検討を行い、適切なパラメータの設定の仕方についても検討する。
18 (MISC)総説・解説(大学・研究所紀要)
共著
衛星測位システム(GPS)における2衛星測位について
今村彰隆, 横田幸久, 佐藤正志
大阪産業大学論集 自然科学編

104, 9-16
1997/10



本論文では、衛星測位システムの測位演算方法について述べ、つぎに実際の受信環境を想定した測位時間率を実測により示し、受信可能な衛星がより少ない場合の対策について考察している。具体的には、2次元測位の際に重要な高度および受信機時計誤差について統計的性質を評価し、2次元測位における誤差分布を幾何学的に示した。つぎに3衛星による2次元測位の最適演算方法を検討し、さらに2衛星による2次元測位についてその適用範囲を実験的に検討している。
19 研究論文(学術雑誌)
共著
Transmission performance of digital FM utilizing jointly Gaussian filter and Nyquist-III filter for a premodulation filter
W Takaishi, T Kimura, A Imamura, M. Sato
Electronics and Communications in Japan (Part III: Fundamental Electronic Science)

80/ 9, 1-10
1997/09




20 研究論文(学術雑誌)
共著
Lock-in time characteristics of dual delay lock loop
K Fukino, T Habara, A Imamura, M. Sato
Electronics and Communications in Japan (Part III: Fundamental Electronic Science)

80/ 6, 93-102
1997/06




21 (MISC)総説・解説(大学・研究所紀要)
共著
チャープ式スペクトル拡散通信を用いた4相位相変調
今村彰隆, 佐藤正志, 杉浦善信, 中村謙児
大阪産業大学論集 自然科学編

103, 17-24
1997/06



本研究では、チャープ式のスペクトル拡散(Spread Spectrum;SS)方式を電灯線バス通信に応用することを検討する。変調方式としては、チャープ信号に4相位相変調(Quadrature Phase Shift Keying;QPSK)を適用する。またその検波方式として圧縮パルス比較方式を提案し、その結果について考察する。またDSP(Digital Signal Processor)を用いた装置を試作した。
22 研究論文(学術雑誌)
共著
ガウスフィルタとナイキストⅢフィルタを併用するディジタルFMの伝送特性
高石渉, 木村建夫, 今村彰隆, 佐藤正志
電子情報通信学会論文誌A

J80-A/ 02, 388-397
1997/02



前置フィルタとしてナイキストⅢフィルタとガウス形フィルタを併用するディジタル周波数変調方式を提案する。本方式では、これら二つのフィルタにより送信信号の位相の時間的変化の様子と1符号期間当たりの位相変化量の制御を独立に行えるため、フィルタのパラメータであるαとBbTを適切に設定することで伝送特性を改善することが可能となる。このように二つのフィルタのパラメータを適切に設定し、それに適応した復調方式を採用することにより、優れた伝送特性が得られる。更に、AWGN環境下で直交同期検波を行った場合、GMSK方式よりも優れた伝送特性を有することを明らかにしている。
23 研究論文(学術雑誌)
共著
2重DLLの同期時間特性
吹野幸治, 羽原巧, 今村彰隆, 佐藤正志
電子情報通信学会論文誌A

J79-A/ 01, 88-97
1996/01



スペクトル拡散通信方式の同期追跡システムとして、2重遅延同期ループ(Dual DLL)が提案されている。Dual DLLは、二つのDLLを用いており、各々独立に動作していることから、同期追跡過程における過渡応答特性がDLLより劣化することが予測される。本論文では、まず、Dual DLLの単位位相ステップ応答を与える式を導出し、この式を用いてDual DLLの同期時間特性についての検討を行い、同期追跡ループのパラメータである減衰係数を適切に設定することにより同期時間特性を劣化させずに済むことを示す。