Search Results 1-20 of 580

  • Study of bovine sperm motility in shear-thinning viscoelastic fluids

    Hyakutake Toru , Sato Koichi , Sugita Kenta

    … To investigate the influence of flagellar waveform on sperm motility in more detail, the waveform was expressed as a function and the progressive thrust of the sperm was calculated based on the empirical resistive force theory. … The results of this study showed that the progressive thrust increased with the curvature of the flagellar tip. … Moreover, we calculated the thrust efficiency of motile sperm. …

    Journal of Biomechanics (88), 130-137, 2019-05-09

    IR 

  • STUDY ON DESIGN AND PROTOTYPING OF SMALL ELECTRIC DUCTED FAN FOR PROPULSION  [in Japanese]

    倉永 卓弥

    … In the study, a 1/10 size small EDF of the actual propulsion unit was used and effects of design factors of impeller such as number of blades, blade shape and tip clearance on thrust and noise characteristics were investigated. …

    法政大学大学院紀要. 理工学・工学研究科編 (60), 1-8, 2019-03-31

    IR  DOI 

  • Microplasma thruster powered by X-band microwaves

    Takahashi Takeshi , Mori Daisuke , Kawanabe Tetsuo , Takao Yoshinori , Eriguchi Koji , Ono Kouichi

    … The emphasis was placed on an understanding of distinguished features of the microplasma generation and thrust performance by X-band microwaves, compared with those by S-band (f = 4 GHz) ones. … The plasma generation, nozzle flow, and thrust performance were numerically analyzed using a two-dimensional fluid model, coupled with an electromagnetic model for microwaves interacting with plasmas in the source region. …

    Journal of Applied Physics 125(8), 2019-02-28

    IR 

  • Microplasma thruster powered by X-band microwaves

    Takahashi Takeshi , Mori Daisuke , Kawanabe Tetsuo , Takao Yoshinori , Eriguchi Koji , Ono Kouichi

    … The emphasis was placed on an understanding of distinguished features of the microplasma generation and thrust performance by X-band microwaves, compared with those by S-band (f = 4 GHz) ones. … The plasma generation, nozzle flow, and thrust performance were numerically analyzed using a two-dimensional fluid model, coupled with an electromagnetic model for microwaves interacting with plasmas in the source region. …

    Journal of applied physics 125(8), 083301-01-083301-21, 2019-02-28

    IR 

  • Development of mobile robot capable of stable passing a step with two driving wheels using parallel linkage  [in Japanese]

    SUZUKI Takaya , TAKAKI Takeshi , JIANG Mingjun , ISHII Idaku

    … Wheel movement is excellent in traveling efficiency, however it is not suitable for running on steps. … We focused on the thrust of the cylinder attached to the robot, and adjusted this value to obtain the condition for maintaining the contact between the wheel and the ground by the analysis based on the hydrostatics and verified by the experiment.</p> …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 2P2-A06, 2019

    J-STAGE 

  • Cutterhead mud-caking detection method and application based on cutter wear and temperature measurement

    JI Zhiyong , XIA Yimin , LAN Hao , YANG Mei , LIN Laikuang

    … Not only the opening of cutterhead could be blocked to cause problem for muck flowing through, mud-caking of a cutterhead will also lead to the increase of thrust and torque, as well as compromise of tunneling efficiency. …

    Journal of Advanced Mechanical Design, Systems, and Manufacturing 13(4), JAMDSM0088-JAMDSM0088, 2019

    J-STAGE 

  • Voice Coil Motor to Control Passenger Vibration for Ultra-Compact Mobility:(Fundamental Analysis for Effect of Coils)  [in Japanese]

    ENDO Ayato , IKEDA Keigo , MINOWA Ryosuke , KATO Hideaki , NARITA Takayoshi

    … The voice coil motor has high thrust performance and simple structure. … Meanwhile, motor characteristics, e.g. motor stroke, thrust variability and voltage capacity, are important factors for reduction of vibration. … Therefore, in this paper, efficiency of vibration control was investigated by simulation considering voltage capacity and nonlinearity of thrust.</p> …

    The Proceedings of Conference of Kanto Branch 2019.25(0), 19F05, 2019

    J-STAGE 

  • Valve Mechanism for Spark-Ignition Engine with Linear Motor:(Fundamental Consideration on Shape Modification)  [in Japanese]

    SATO Yukinao , KATO Hideaki , NARITA Takayoshi

    … <p>Recently, high efficiency of an automobile engine is demanded from the viewpoint of energy saving. … Therefore, we design a linear motor capable of opening and closing the engine valve, and we propose a valve system that can realize combustion efficiency improvement and pumping loss reduction by arbitrary valve lift and timing. … In this study, we derive the maximum thrust and the maximum speed as a basic study and considered the electric drive valve system (EDVS) design aimed at it. …

    The Proceedings of Conference of Kanto Branch 2019.25(0), 19G10, 2019

    J-STAGE 

  • Thermal Characteristics of Spindle Supported with Water-Lubricated Hydrostatic Bearings

    Nakao Yohichi , Kirigaya Rei , Fedorynenko Dmytro , Hayashi Akio , Suzuki Kenji

    … The flowrates of water as the lubricating fluid were measured separately for the radial and thrust bearings, in relation to the supply pressure. … By comparing the generated total power loss and the power transferred by the water flow, the cooling efficiency of the flow of lubricating-water was defined in this paper. … If the cooling efficiency is 100%, the temperature change of the spindle can be zero regardless of the power loss, achieving ideal thermal stability of the spindle. …

    International Journal of Automation Technology 13(5), 602-609, 2019

    J-STAGE 

  • Active Seat for Ultra-Compact Mobility with Voice Coil Motor (Fundamental Consideration on Design Method of Motors Considering Control of Vibration)  [in Japanese]

    Endo A. , Ikeda K. , Minowa R. , Kato H. , Narita T.

    … Motor characteristics, e.g. motor stroke, thrust variability, and voltage capacity, are important factors for reducing vibration. … Moreover, the efficiency of vibration control was investigated in a simulation in which voltage capacity and nonlinearity of thrust were considered.</p> …

    Transaction of the Magnetics Society of Japan Special Issues 3(2), 120-125, 2019

    J-STAGE 

  • Characterization of a Liquid-propellant Pulsed Plasma Thruster Using Various Nozzle Configurations

    MIYAGI Kinya , KAKAMI Akira , TACHIBANA Takeshi

    … The thrust measurements showed that the LP-PPT prototype demonstrated superior performance when it was fitted with the embedded annular anode ceramic nozzle than when it was fitted with the monolithic-anode nozzle. … = 10 mm, which yielded an impulse bit of 167 µNs, a specific impulse of 1,150 s, a thrust efficiency of 5.9%, and a thrust–power ratio of 11 µNs/J at a capacitor-stored energy of 14 J and a propellant mass shot of 14.8 µg.</p> …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 62(4), 184-191, 2019

    J-STAGE 

  • Mechanical efficiency of fish thrust induced by tail beating: comparison between kinetic energy and metabolic energy

    Eguchi Go , Aoki Yuki , Torisawa Shinsuke , Takehara Kohsei , Takagi Tsutomu

    … <p>There are few studies that compare thrust power <i>P</i><sub><i>T</i></sub> … obtained from oxygen consumption and mechanical efficiency <i>η</i> … <sup>-1</sup>) of fish thrust. … and thrust force <i>T</i> …

    Journal of Aero Aqua Bio-mechanisms 8(1), 54-62, 2019

    J-STAGE 

  • Control of Starter Generator in a UAV with a Micro Jet Engine

    Itoh Jun-ichi , Kawamura Kazuki , Kusaka Keisuke , Ohnuma Yoshiya , Koshikizawa Hiroyuki , Abe Kazuyuki

    … Both the jet engine and the propellers that are powered by the jet engine via a starter generator generates the thrust power. … Using the jet engine for obtaining the thrust, it is possible to extend a flight range since the energy density of the jet engine of the developed system is higher than the energy density of the battery in the conventional system. … As the results, the maximum conversion efficiency of 92.7% is observed. …

    IEEJ Journal of Industry Applications 8(3), 421-429, 2019

    J-STAGE 

  • Cutting Capability of Microdrills in Nonstep Drilling

    Uchiyama Mitsuo , Sakata Naoshi

    … In this study, nonstep drilling methods are developed for high-efficiency processing. … Herein, the effects of the cutting oil supply method and the drill's feed rate on the developed thrust force and torque during drilling are investigated. …

    International Journal of Automation Technology 13(1), 74-79, 2019

    J-STAGE 

  • Hybrid Rocket Firing Experiments at Various Axial–Tangential Oxidizer-Flow-Rate Ratios

    Ozawa Kohei , Kitagawa Koki , Aso Shigeru , Shimada Toru

    … A-SOFTs are intended to control thrust at an optimal O/F and achieve a high baseline of regression rates with a fixed motor configuration. … Combustion efficiency was evaluated indirectly using equations for the efficiencies of thrust and specific impulse to eliminate errors due to local pressure shifts and the centrifugal force in swirling flows. …

    Journal of Propulsion and Power 35(1), 94-108, 2018-09-24

    IR 

  • Improvement of Thrust Characteristics with Variable Magnetic Flux in a Free-Piston Engine Linear Generator System  [in Japanese]

    佐藤 光秀 , 楡井 雅巳 , 山中 雄一朗 , 鈴木 樹 , 後藤 拓海 , 卜 穎剛 , 水野 勉

    電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan 2018(62-80), 1-6, 2018-08-22

  • Experimental Study on Small Sounding Hybrid Rocket Motor using LT Fuel  [in Japanese]

    ONAGANO Kazunari , KAWABATA Yo , WADA Yutaka , KATOU Nobuji , HORI Keiichi

    … The hybrid rocket motor is required 5000 N thrust and 30 second burning time. … efficiency and structural coefficient. … efficiency is more than 87.5%, the altitude reaches 30 km.</p> …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), J1920102, 2018

    J-STAGE 

  • Research on Performance Improvement of Thruster for Ships  [in Japanese]

    YOSHIKAWA Naoya , SHIGEMITSU Toru , SODA Tsutomu , WATANABE Keishin

    … <p>Thruster is a thrust device that has a propeller in the tunnel which penetrates the body of the ship laterally. … It is required for the thruster to improve the thrust and operability. … A propeller solidity is one of the important parameters to influence the thrust, but the relationship between the propeller solidity and detailed thruster performance is not clarified. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), J0550304, 2018

    J-STAGE 

  • Multi-DOF Control of an AUV with 1-DOF Input  [in Japanese]

    KUNIMATSU Kei , KURABAYASHI Daisuke , HATTORI Yuya

    … The test result partially shows that the robot has the necessary thrust for the movement. … Generally, multi-DOF control using low-DOF input in non-holonomic systems has high efficiency. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018(0), 2P1-B08, 2018

    J-STAGE 

  • Power Transmission of CVT Using aMetal V-belt under Fluctuating Torque  [in Japanese]

    Isozaki Yusuke , Okubo Kazuya , Fujii Toru , Sakagami Kyohei , Yagasaki Toru

    … However, the experimental results confirmed that no sliding slip macroscopically occurred while partial slip called micro sliding slip occurred when the maximum torque exceeded the critical torque for a given thrust. … The micro sliding slip reduces the power transmitting efficiency, and probably gives additional damage to pulleys and elements of the belt. …

    Transactions of Society of Automotive Engineers of Japan 49(6), 1230-1236, 2018

    J-STAGE 

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