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Shun Tanaka,Tadashige Ikeda,Atsuhiko Senba 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
Carbon fiber reinforced plastic (CFRP) laminates are sometimes adopted as material of space observation systems because their specific stiffness is high and thermal deformation can be controlled by stacking sequence and fiber orientation. However, unexpected out-ofplane thermal deformation is generated on CFRP laminate plates because of fiber orientation error. In this research, a CFRP reflector model was built and its thermal deformation was measured to determine the kinds of deformation generated on the reflector. In the experiment, non-axisymmetric deformation was generated even for uniform heating. Finite-element analysis (FEA) on thermal deformation of the reflector model was performed to explain non-axisymmetric deformation. FEA showed that non-axisymmetric deformation was generated by fiber orientation error. The thermal deformation of the CFRP reflector model was strongly affected by fiber orientation error, and accordingly, the fiber orientation angle of CFRP reflectors should be controlled strictly depending on the desired accuracy.
Smart Suit: Soft Power Suit with Semi-active Assist Mechanism
Takayuki Tanaka,Yuta Satoh,Shun’ichi Kaneko,Yoshihito SUZUKI,Naohisa Sakamoto,Shuji Seki 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
We have been developing “mart Suit”as a soft and light-weight wearable power assist system. A prototype for preventing low-back injury in agricultural works and its semi-active assist mechanism have been developed in the previous study. The previous prototype succeeded to reduce about 14% of average muscle fatigues of body trunk in waist extension/flexion motion. In this paper, we describe a prototype of smart suit for supporting waist and knee joint, and its control method for preventing the displacement of the adjustable assist force mechanism in order to keep the assist efficiency.
Nobuyuki Tanaka,Tatsuji Munaka,Joao Filipe Papel,Shun‑ichi Hattori,Toshiya Iwamatsu,Teruhisa Miura,Fujio Tsutsumi 한국대기환경학회 2023 Asian Journal of Atmospheric Environment (AJAE) Vol.17 No.1
In Japan, the number of elderly people in need of nursing care is increasing while the population of young people is decreasing, and the potential for labor shortages in the field of elder care is of great concern. This study aimed to estimate the behavior of the elderly by using sensors to monitor indoor air quality (IAQ), without placing undue burden on the elderly or their caregivers. Odor and carbon dioxide ( CO2) concentrations were monitored in a private room of a nursing home in the Kanto Region of Japan, the behaviors of the resident and staff members were recorded, and the relationship between the two was analyzed. Both odor and CO2 concentrations were higher when the resident was present than when absent, indicating that the resident was one of the main sources of indoor odor and CO2. In addition, after the resident entered the room, the CO2 concentration increased and remained stable, whereas the odor concentration tended to vary after the resident entered the room, first increasing and later decreasing. This suggested that the increase or decrease in odor could be used to monitor the behavior of the resident and staff members. The relationship between the slopes of odor and CO2 in typical behavioral events suggest that if only odor increases and CO2 does not change, the likelihood of the event in which feces were observed during diaper changes is high. In addition, based on the behavior near the sensor, the rate of CO2 and odor emissions differed between the elderly resident and the younger staff members, suggesting that the ratio of odor slope to CO2 slope may be greater in the elderly than in younger people. Furthermore, the repeated number of increases and decreases in odor and CO2 suggested that multiple events could be distinguished. These results suggest that IAQ can be utilized to estimate the behavior of residents and staff in nursing care facilities for the elderly.
Carbon nanofiber bundles grown by plasma enhanced chemical vapor deposition
Norihiro Shimoi,Shun-ichiro Tanaka 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5
A bundle of carbon nanofibers (CNFs) was successfully obtained on a glass substrate through a plasma enhanced chemical vapor deposition (PECVD) process. CNFs having dimensions of 100 nm in diameter and 1 μm in length nucleated on the Ni- Cr catalysis and grew selectively in a circular area 3 μm in diameter with a number density of 50 in 1 μm2. PECVD was used with mixed source gases of CH4/H2/He and a substrate temperature of less than 743 K which was lower than the transition temperature of glass substrate. Each CNF had a nanostructure of a stacked cup-cone shaped graphite shells with a Ni-Cr nanoparticle surmounted at the top. The field emission characteristics of the CNF bundle were also evaluated up to 3 μA at 130 V and the maximum in the current-voltage relation was converted to a Fowler-Nordheim (F-N) plot using a work function value of 5.0 eV for CNF which showed an explicit linear F-N relation. This means a CNF bundle is a candidate element for two dimensional field emitter devices. A bundle of carbon nanofibers (CNFs) was successfully obtained on a glass substrate through a plasma enhanced chemical vapor deposition (PECVD) process. CNFs having dimensions of 100 nm in diameter and 1 μm in length nucleated on the Ni- Cr catalysis and grew selectively in a circular area 3 μm in diameter with a number density of 50 in 1 μm2. PECVD was used with mixed source gases of CH4/H2/He and a substrate temperature of less than 743 K which was lower than the transition temperature of glass substrate. Each CNF had a nanostructure of a stacked cup-cone shaped graphite shells with a Ni-Cr nanoparticle surmounted at the top. The field emission characteristics of the CNF bundle were also evaluated up to 3 μA at 130 V and the maximum in the current-voltage relation was converted to a Fowler-Nordheim (F-N) plot using a work function value of 5.0 eV for CNF which showed an explicit linear F-N relation. This means a CNF bundle is a candidate element for two dimensional field emitter devices.
Fast Voltage-Dip Detection Method With Single-Phase PLL in Bidirectional Battery Charger for EVs
Fuka Ikeda,Shun Okamoto,Masayuki Okamoto,Hiroaki Yamada,Toshihiko Tanaka 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This study proposes a fast voltage-dip detection method with a single-phase phase-locked loop (PLL), which is always included in the control circuit of a bidirectional battery charger for electric vehicles with a power quality compensator. The basic principle of the proposed fast voltage-dip detection method using single-phase PLLs is discussed in detail. The detection time is theoretically derived and compared using two types of single-phase PLLs. A digital computer simulation was implemented to confirm the validity and practicability of the proposed fast voltage-dip detection method with the PSIM software considering IEC61000-4-11. A prototype experimental setup was constructed and tested, where IEC61000-4-11 was considered. The simulation and experimental results demonstrate that the proposed detection method detects the voltage dip rapidly and correctly. The simulation and experimental results also demonstrate that the detection times in the simulation and experimental results agree well with the theoretical values.
Attachment Behavior of Fission Products to Solution Aerosol
Takamiya, Koichi,Tanaka, Toru,Nitta, Shinnosuke,Itosu, Satoshi,Sekimoto, Shun,Oki, Yuichi,Ohtsuki, Tsutomu The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.4
Background: Various characteristics such as size distribution, chemical component and radio-activity have been analyzed for radioactive aerosols released from Fukushima Daiichi Nuclear Power Plant. Measured results for radioactive aerosols suggest that the potential transport medium for radioactive cesium was non-sea-salt sulfate. This result indicates that cesium isotopes would preferentially attach with sulfate compounds. In the present work the attachment behavior of fission products to aqueous solution aerosols of sodium salts has been studied using a generation system of solution aerosols and spontaneous fission source of $^{248}Cm$. Materials and Methods: Attachment ratios of fission products to the solution aerosols were compared among the aerosols generated by different solutions of sodium salt. Results and Discussion: A significant difference according as a solute of solution aerosols was found in the attachment behavior. Conclusion: The present results suggest the existence of chemical effects in the attachment behavior of fission products to solution aerosols.
Takashi KUSAKA,Takayuki TANAKA,Shun’ichi KANEKO,Yoshihito SUZUKI,Munenobu SAITO,Shuji SEK,Naohisa SAKAMOTO,Hidekazu KAJIWARA 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes the assist force control of semi-active assist system ”Smart Suit” for horse trainer. We developed a soft and flexible power assist device named ”Smart Suit” for reducing horse trainers’ physical fatigue in their horse training works in order to prevent their spine or legs injuries. The smart suit is a kind of semi-active and flexible power assist devices. In order to gain the suitable assist force for periodical horse trainers’ motion, the assist force control method based on the periodical input control was developed in this study. Also, for stabilizing their horse riding motion, we developed the assist force control method considering their dynamic stability by controlling their center of gravity on the zero moment point (ZMP)which is the dynamic stable point.