著者

戸田 均

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2013 (ISSN:24242667)

巻号頁・発行日

pp._S113024-1-_S113024-3, 2013-09-08 (Released:2017-06-19)

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To prevent the wheel separation accidents, clarifying the influence of running condition on load of wheel bolts. In this paper, I investigated the stress of wheel bolts while the vehicle is moving. In the results, I confirmed that stress amplitude on left rear wheel bolts increased in the car trun to the right. Then the load of wheel bolts changed the pulsating bending load from the reversed bending load with loosing the wheel bolt.

著者

北村 郁生 前田 将輝 田中 博人 劉 浩

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2013 (ISSN:24242667)

巻号頁・発行日

pp._J027041-1-_J027041-5, 2013-09-08 (Released:2017-06-19)

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Hummingbirds are the only species in birds capable of performing continuous hovering flight. However, the precise aerodynamic force generating mechanisms, which should be associated with the dynamic wing-morphing, still remains unclear. In this study, targeting at hummingbird Amazilia amazilia, we aim at conducting a systematic analysis of flapping-wing kinematics and dynamic configuration of the wings during hovering flight. With use of a filming system consisting of four synchronized digital high-speed video cameras operating at 2000 frames per second, we recorded a sequence of hovering with sufficiently high resolution. With the video images, characteristic points on the right wing of the hummingbird were tracked. Additionally, we conducted the flapping experiment to evaluate the effect of the wing-morphing on lift generation. Two time-variant wing deformation parameters were obtained: wing surface area and spanwise twist. We found that the wing area shows a variation up to 20% within a wingbeat cycle. Our results indicate that the time variation of the angles between adjacent primary feather shafts is the main cause of the variation of the wing area. The wing twist shows asymmetric variation during upstroke and downstroke, and this asymmetry is prominent for the inboard part of the wing. The hummingbird-inspired flapper experiment shows it is generating sufficient aerodynamic force to support the original hummingbirds weight based on which it is modeled.

著者

吉田 喜一

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2013 (ISSN:24242667)

巻号頁・発行日

pp._S201046-1-_S201046-4, 2013-09-08 (Released:2017-06-19)

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Fifty years passed after College of Technology started and more than four hundred thousand students graduated. It is found from various statistics datum that children of people which are seriously affected by economic condition enter to College of Technology. Fifty years' history of College of Technology is introduced roughly. The roles of College of Technology are reconfirmed by using various statistics datum (Application rate to College of Technology, Promises of employment of students of High School, Junior College and College of Technology)

著者

村井 聡紀 土屋 茉由 穂苅 真樹

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2013 (ISSN:24242667)

巻号頁・発行日

pp._J231011-1-_J231011-5, 2013-09-08 (Released:2017-06-19)

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In general, bat swing analysis of baseball has adopted an optical motion capture system. It is possible to perform advanced operating analysis, but the system is not practical for large-scale, high cost and labor-consuming measurement. In this study, the trunk rotation movement in baseball bat swing was measured using a three-dimensional gyro sensor. Gyro sensor attached to the shoulder and waist, to measure the angular velocity of the vertical axis of the body. It was possible to show a rotation movement of the trunk during the bat swing similar to the DLT method. There was no significant correlation between the angular velocity of the trunk and swing speed. There was a significant positive correlation between the maximum angular velocity of the waist and maximum angular velocity of the shoulder (r = 0.66). As a result, it was to clarify the relationship of the swing speed and trunk rotation movement.

著者

山川 勝史 岩崎 遼一 細谷 直人 松野 謙一

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2013 (ISSN:24242667)

巻号頁・発行日

pp._G051035-1-_G051035-4, 2013-09-08 (Released:2017-06-19)

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In this paper, numerical simulation for influenza infection was conducted using difference between air-flow course and virus-moving course. An alteration of radius of virus droplet changes sedimentation velocity. Then, the radius is affected by temperature and humidity around droplets. Flying virus drops may combine to other droplets. The repetition of the combination between droplets affects the sedimentation velocity of the droplet. Furthermore, using survival rate of influenza virus and human resistance, more realistic simulation is enabled. In this paper, the effectiveness of the method was shown carrying out infection simulation in an indoor environment.