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Counter-Rotating Type Pumping Unit (Impeller Speeds in Smart Control)
Kanemoto, Toshiaki,Komaki, Keiichi,Katayama, Masaaki,Fujimura, Makoto Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.3
Turbo-pumps have weak points, such as the pumping operation is unstable on the positive slope of the head curve and/or the cavitation occurs at the low suction head. To improve simultaneously both weak points, the first author invented the unique pumping unit composed of the tandem impellers and the peculiar motor with the double rotational armatures. The front and the rear impellers are driven by the inner and the outer armatures of the motor, respectively. Both impeller speeds are automatically and smartly adjusted in response to the pumping discharge, while the rotational torques between both impellers/armatures are counter-balanced. Such speeds contribute to suppress successfully not only the unstable operation at the low discharge but also the cavitation at the high discharge, as verified with the axial flow type pumping unit in the previous paper. Continuously, this paper investigates experimentally the effects of the tandem impeller profiles on the pump performances and the rotational speeds against the discharge, using the impellers whose loads are low and/or high at the normal discharge. The worthy remarks are that (a) the unstable operation is suppressed as expected and the shut off power is scarcely large in the smart control, (b) the blade profile contributes to determine the discharge giving the maximum/minimum rotational speed where the reverse flow may incipiently appears at the front impeller inlet, (c) the tandem impeller profiles scarcely affect the rotational speeds, while the loads of the front and the rear impellers are same, but (d) the impeller with the low load must run faster and the impeller with the high load must run slower at the same discharge to take the same rotational torque, and (e) the reverse flow at the inlet and the swirling velocity component at the outlet of the front impeller with the high load require making the rotational speed of the rear impeller with low load fairly faster at the lower discharge.
Dream of marine-topia: New technologies to utilize effectively renewable energies at offshore
Toshiaki Kanemoto 한국물리학회 2010 Current Applied Physics Vol.10 No.2
For the next leap in the sustainable technologies, we are under obligations not only to cope with the warming global environment but also to conserve natural ecosystem and to coexist with nature. This paper introduces the following advanced technologies in Kyushu Institute of Technology, to utilize effectively the promising ocean and wind resources at the offshore. (1) Counter-Rotating Type Reversible Hydroelectric Unit, which is composed of the tandem runners and the peculiar generator with the double rotational armatures, is applicable to both rising and falling tides at the power station with the embankment,in place of the traditional bulb type turbines. (2) Gyro-Type Reversible Hydraulic Turbine, which is composed of some blades with a high aspect ratio, is effective to utilize the tide power even at the shallow and/or the very low range of the tide. (3) Submerged Ocean Wave Power Unit, where a pair of floats is lined up at the interval of one wave pitch and supports the vertical type hydroelectric unit submerged at the middle position, can get velocity energy four times higher than the traditional unit. (4) Intelligent Wind Turbine Unit, which is composed of the tandem wind rotors and the double rotational armatures,is suitable for the offshore wind farm.
Redundancy of the Giant Swing Backward Movement on the High Bar
Yoshinori Kanemoto,Taiga Yamasaki,Xin Xin,Kiyoshi Gotoh 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Extent of redundancy in human movements under nonholonomic constraints can be an important factor to detemince a resulting movement. However, the redundancy has seldom been examined concretely in previous studies concerning optimality of human movements under such constraints. This study focuses on a gymnastic movement on the high bar, called "giant swing backward", as and almost periodic task under a second order nonholonomic constraint, and reveals a part of redundancy of the task by extending our prvious study. To this end, a simple dynamical model of an expert gymnast performing the giant swing back ward is constructed with parameterization of time histories of actuated joint angles by Fourier serires, and is confirmed to approximately reproduce a measured movement of the gymnast. The redundancy is calculated in various parameter spaces composed of lower order fourier coefficients. The results illustrate restricted but considerable redundancy underlying the giant swing backward. Moreover, within the set of the redundant movements, four kinds of optimization citeria are examined to explain the movement performed by the gymnast.
Return Vane Installed in Multistage Centrifugal Pump
Miyano, Masafumi,Kanemoto, Toshiaki,Kawashima, Daisuke,Wada, Akihiro,Hara, Takashi,Sakoda, Kazuyuki Korean Society for Fluid machinery 2008 International journal of fluid machinery and syste Vol.1 No.1
To optimize the stationary components in the multistage centrifugal pump, the effects of the return vane profile on the performances of the multistage centrifugal pump were investigated experimentally, taking account of the inlet flow conditions for the next stage impeller. The return vane, whose trailing edge is set at the outer wall position of the annular channel downstream of the vane and which discharges the swirl-less flow, gives better pump performances. By equipping such return vane with the swirl stop set from the trailing edge to the main shaft position, the unstable head characteristics can be also suppressed successfully at the lower discharge. Taking the pump performances and the flow conditions into account, the impeller blade was modified so as to get the shock-free condition where the incidence angle is zero at the inlet.
Matching Diffuser Vane with Return Vane Installed in Multistage Centrifugal Pump
Kawashima, Daisuke,Kanemoto, Toshiaki,Sakoda, Kazuyuki,Wada, Akihiro,Hara, Takashi Korean Society for Fluid machinery 2008 International journal of fluid machinery and syste Vol.1 No.1
The effects of the diffuser vane on the performances of the multistage centrifugal pump were investigated experimentally, taking account of the interactions among the diffuser vane, the return vane, and the next stage impeller. It is very important to match well the diffuser vane with the return vane, for improving the hydraulic efficiency of the pump. The efficiency may be more improved by making the cross-sectional area of the channel from the diffuser vane outlet to the return vane inlet larger, as much as possible.
All that elongates is not a polyp
Atsushi Iraha,Moemi Kanemoto,Akira Hokama 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.6
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Automotive wheel with cooling fan for brake system and in-wheel motor
Ryunosuke Kawashima,Toshiaki Kanemoto 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.6
For suppressing the automotive troubles like an overheating of the drum/disc brake units or the in-wheel motor devices, authors propose the new automotive wheel with the blade shape spokes, which can work as the cooling fan, by use of the blade design procedure of the turbomachinery. In this paper, the prototype automotive wheels with the centrifugal or axial type blades were prepared to confirm the flow generation by proposed wheels experimentally and numerically, as the preliminary step. The proposed wheel brings the increase of the air flow through the wheel compared with the traditional wheel, which has the rectangle shape spokes. At a same time, the required power for the rotation wheel rotation with cooling fan also increase about 2-4% of the traditional one. Furthermore, the swirling inlet flow, which generates by the rotating cylindrical rim, may greatly influences the discharge performance of the wheel with the axial blades.