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Influence of Separated Vortex on Aerodynamic Noise of an Airfoil Blade

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Journal of Thermal Science 2010年第1期19卷 60-66页

作者： Soichi Sasaki Hajime Takamatsu Masao Tsujino Haruhiro Tsubota Hidechito Hayashi Faculty of Engineering Nagasaki University1-14 Bunkyo-machiNagasaki 852-8521Japan Graduate School of Science and Technology Nagasaki University1-14 Bunkyo-machiNagasaki 852-8521Japan Research Division Komatsu Ltd.1200MandaHiratsuka-shiKanagawa 254-8567Japan

In order to clarify the mechanism by which aerodynamic noise is generated from separated flow around an airfoil blade,the relation between the attack angle and the aerodynamic noise of the blade was analyzed using a wind tunnel experiment and a CFD *** the case of rear surface separation,the separated vortex which has a large-scale structure in the direction of the blade chord is transformed into a structure that concentrates at the trailing edge with an increase in the attack *** aerodynamic noise level then becomes small according to the vortex scale in the blade *** the flow is separated at the leading edge,a separated vortex of low pressure is formed at the vicinity of the trailing *** pressure fluctuations on the blade surface at the vicinity of the trailing edge become large due to the vortex in the *** is considered that the aerodynamic noise level increases when the flow is separated at the leading edge because the separated vortex is causing the fluctuations due to wake vortex shedding.

关键词：叶片表面气动噪声分离涡翼型空气动力性噪声计算流体力学压力波动噪声水平

Prediction of Aerodynamic Noise in a Ring Fan Based on Wake Characteristics

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Journal of Thermal Science 2011年第2期20卷 144-149页

作者： Soichi Sasaki Masaharu Fukuda Masao Tsujino Haruhiro Tsubota Faculty of Engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan Graduate School of Science and Technology Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan Research Division Komatsu Ltd.1200 Manda Hiratsuka-shi Kanagawa 254-8567 Japan

A ring fan is a propeller fan that applies an axial-flow impeller with a ring-shaped shroud on the blade tip side. In this study, the entire flow field of the ring fan is simulated using computational fluid dynamics (CFD); the accuracy of the CFD is verified through a comparison with the aerodynamic characteristics of a propeller fan of current model. Moreover, the aerodynamic noise generated by the fan is predicted on the basis of the wake characteristics. The aerodynamic characteristic of the ring fan based on CFD can represent qualitatively the variation in the measured value. The main flow domain of the ring fan is formed at the tip side of the blade because blade tip vortex is not formed at that location. Therefore, the relative velocity of the ring fan is increased by the circumferential velocity. The sound pressure levels of the ring fan within the frequency band of less than 200 Hz are larger than that of the propeller fan. In the analysis of the wake characteristics, it revealed that Karman vortex shedding occurred in the main flow domain in the frequency domain lower than 200 Hz ; the aerodynamic noise of the ring fan in the vortex shedding frequency enlarges due to increase in the relative velocity and the velocity fluctuation.

关键词：空气动力特性噪声特性风扇预测计算流体力学空气动力噪声相对速度螺旋桨

Prediction of fuel cell performance degradation using a combined approach of machine learning and impedance spectroscopy

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Journal of Energy Chemistry 2023年第12期87卷 32-41,I0003页

作者： Zewei Lyu Yige Wang Anna Sciazko Hangyue Li Yosuke komatsu Zaihong Sun Kaihua Sun Naoki Shikazono Minfang Han Institute of Industrial Science The University of TokyoTokyo 153-8505Japan Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China Xuzhou Huatsing Jingkun Energy Co. Ltd.Xuzhou 221005JiangsuChina

Accurate prediction of performance degradation in complex systems such as solid oxide fuel cells is crucial for expediting technological ***,significant challenges still persist due to limited comprehension of degradation mechanisms and difficulties in acquiring in-situ *** this study,we propose an effective approach that integrates long short-term memory(LSTM) neural network and dynamic electrochemical impedance spectroscopy(DEIS).This integrated approach enables precise prediction of future evolutions in both current-voltage and EIS features using historical testing data,without prior knowledge of degradation *** short-term predictions spanning hundreds of hours,our approach achieves a prediction accuracy exceeding 0.99,showcasing promising prospects for diagnostic ***,for long-term predictions spanning thousands of hours,we quantitatively determine the significance of each degradation mechanism,which is crucial for enhancing cell ***,our proposed approach demonstrates satisfactory predictive ability in both time and frequency domains,offering the potential to reduce EIS testing time by more than half.

关键词： Solid oxide fuel cell Performance degradation Electrochemical impedance spectroscopy Longshort-term memory Machine learning

Learning Control of Hyper Redundant Robots Based on Linear Learning Control Scheme

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Learning Control of Hyper Redundant Robots Based on Linear L...

Plasma Nitriding-Assisted Printing of Stainless Steel Punches for Micro-piercing Process

首届亚洲机械电子学学术会议

作者： Daisuke Matsuura Nobuyuki Iwatsuki Yoichi Shimada Kouichi Morikawa Graduate School Tokyo Institute of Technology2-12-1 OhokayamaMeguro-kuTokyo 152-8552Japan komatsu Co. Ltd.Japan

This paper describes motion control of hyper redundant robots with learning control based on linear learning control *** the conventional linear learning control scheme for non-redundant robots,the increment of joint inputs in a celtain learning process could be calculated with an inverse Jacobian matrix and the linear combination of error *** using general solution of inverse kinematics with pseudo inverse of Jacobian matrix,the control scheme was extended so that a redundant robot can realize a motion as a sub task while generating the trajectory specified as a main *** new control scheme was applied to control a planar serial manipulator with 5 DOF,which generated continuous path trajectory while avoiding obstacles in its workspace. Several simulations and experiments revealed that the proposed control scheme was effective and useful.

关键词： Learning control Linear learning control scheme Hyper redundant robot Obstacle avoidance

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Journal of Mechanics Engineering and Automation 2017年第1期7卷 1-11页

作者： Tatsuhiko Aizawa Tomomi Shiratori Department of Engineering and Design Shibaura Institute of Technology 3-9-14 Shibaura Minato-City Tokyo 108-8548 Japan R & D Center Komatsu Seiki Kosakusho Co. Ltd. Shiga-Kuwahara Ohaza Suwa-City Nagano 942-2 Japan

High-Performance UV Lamp System

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High-Performance UV Lamp System

New Rectangular-like Columns： Advanced Swing Jet Grouting Test and Quality Confirmation

RadTech Asia 2005

作者： Daisuke Maruyama Osamu komatsu Yoji Morozumi Takeshi Tada Satoshi Nishibu Akio Suzuki ORC Manufacturing Co. Ltd. 28-5 Hirai Hinode-cho Nishitama-gun Tokyo Japan ORC Manufacturing Co. Ltd. 28-5 Hirai Hinode-cho Nishitama-gun Tokyo Japan ORC Manufacturing Co. Ltd. 28-5 Hirai Hinode-cho Nishitama-gun Tokyo Japan ORC Manufacturing Co. Ltd. 28-5 Hirai Hinode-cho Nishitama-gun Tokyo Japan ORC Manufacturing Co. Ltd. 28-5 Hirai Hinode-cho Nishitama-gun Tokyo Japan ORC Manufacturing Co. Ltd. 28-5 Hirai Hinode-cho Nishitama-gun Tokyo Japan

＜正＞ We have developed a system that operates stably with higher luminance, high irradiance, and no significant ripples in optical output compared to existing microwave excited UV lamp systems. Its higher luminance and irradiance enable high-speed UV processing. The UV system can be made more compact than existing UV systems operating at same emission power. Its high irradiance enables a wide variety of UV curing resins （material, thickness etc.） to be selected. In addition, due to very low ripples in optical output, no unevenness is caused, even during very high-speed UV processing. Furthermore, stability of operation contributes to the high economic efficiency of actual manufacturing *** course, these lamp systems can be connected in the direction of the lengths of the lamps, so there are no theoretical limitations on the lengths of lamps, resulting in a very large lighting area, and making the system suitable for wide-ranging applications.

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Journal of Civil Engineering and Architecture 2018年第3期12卷 213-224页

作者： Tsutomu Tsuchiya, Hiroyuki Abe Kazuhiko komatsu Chemical Grouting Co. Ltd. Tokyo 105-0001 Japan

The Biological Actions and Mechanisms of Brain-Derived Neurotrophic Factor in Healthy and Disordered Brains

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Neuroscience & Medicine 2014年第4期5卷 183-195页

作者： Toshiyuki Mizui Yuichiro Tanima Hiroko komatsu Haruko Kumanogoh Masami Kojima Bio-Interface Research Group Health Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Ikeda Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Japan Global Discovery Research Neuroscience and General Medicine Product Creation Unit Eisai Product Creation Systems Eisai Co. Ltd. Tsukuba Japan

Brain-derived neurotrophic factor (BDNF) is a neurotrophin that elicits neuronal survival and differentiation, synaptic transmission, and the modulation of synaptic plasticity. The biological actions of BDNF are mediated via two distinct receptors: the high-affinity tropomyosin-related kinase B (TrkB) receptor and the low-affinity p75 neurotrophin receptor (p75NTR). Recent findings regarding the actions and mechanisms of BDNF are reviewed here. Activity-dependent synaptic plasticity, as exemplified by long-term potentiation (LTP) and long-term depression (ltd., underlies the cellular mechanism of learning and memory. An accumulating body of evidence shows that BDNF modulates synaptic plasticity. This function requires extracellular neurotrophin release, synaptic activity-dependent local protein synthesis. In addition, a precursor of BDNF, proBDNF, is emerging as a new ligand with biological activities that are distinct from those of BDNF. The proteolytic cleavage of proBDNF is also proposed as a mechanism that determines the direction of BDNF actions. This review discusses the post-translational processing of proBDNF, the modulatory roles of the human BDNF polymorphism Val66Met, recent reports of the novel mechanisms of BDNF expression, and clinical reports showing the roles of BDNF in the blood. Taken together, these data provide new insights into the biological roles of BDNF and its related molecules in the central nervous system.

关键词： Component Brain-Derived Neurotrophic Factor (BDNF) Tropomyosin-Related Kinase B (TrkB) Synaptic Plasticity Polymorphism Proteolytic Cleavage

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粉末注射成形奥氏体不锈钢的疲劳和冲击强度

粉末冶金技术 2005年第2期23卷 95-99页

作者： H.Kyogoku S.komatsu M.Shinzawa H.Nakayama T.Matsuoka 永佳 Department of Mechanical Engineering Kinki UniversityHigashihiroshimaHiroshima 739-2116Japan Nippon piston Ring Co.ltd. NogiTochigi 329-0114Japan CASTEM Co.ltd. FukuyamaHiroshima 720-0004Japan Department of Mechanical Systems Engineering Doshisha UniversityKyotanabeKyto 610-0394Japan

本文的目的是研究粉末性能对粉末注射成形奥氏体不锈钢的力学性能(特别是疲劳和冲击强度)的影响。试样用混有聚酰氨粘结剂系的水雾化(WA)和气雾化(GA)粉末制成。注射坯在空气中脱粘,而后在不同温度、不同保温时间下真空烧结。粉末性能... 详细信息

本文的目的是研究粉末性能对粉末注射成形奥氏体不锈钢的力学性能(特别是疲劳和冲击强度)的影响。试样用混有聚酰氨粘结剂系的水雾化(WA)和气雾化(GA)粉末制成。注射坯在空气中脱粘,而后在不同温度、不同保温时间下真空烧结。粉末性能对烧结体的密度、显微组织和力学性能有显著影响。孔和析出物显示出Ostward时效,而孔和析出物的长大满足Lifshitz-Wagner方程。WA和GA粉末试样的疲劳极限分别约为300MPa和310MPa。它们的疲劳强度略低于常规锻材。烧结体的冲击值随密度增加线性增大。

关键词：奥氏体不锈钢粉末注射成形冲击强度力学性能粉末性能真空烧结保温时间显微组织疲劳极限疲劳强度烧结体析出物气雾化水雾化粘结剂聚酰氨冲击值试样密度