カドワキ　レン   Ren Kadowaki   門脇　廉    所属   追手門学院大学  理工学部 機械工学科    職種   准教授
発表年月日	2019/11
発表テーマ	加振振動数を追従する凹型板ばねの移動現象に関する実験的考察
会議名	日本機械学会九州支部沖縄講演会
学会区分	全国学会
発表形式	その他
国名	日本
開催地名	琉球大学（沖縄県中頭郡西原町）
開催期間	2019/11/16～2019/11/16
発表者・共同発表者	松井 亮磨,井上 卓見,門脇 廉,吉村 謙太,大村 和久
概要	The authors devised a test equipment to automatically adjust the natural frequency to exciting frequency. This equipment consists of a sector-like shaped base, an elongated plate spring and rotating shaft. The transverse motion of the plate spring enables the equipment to change its own natural frequency. Under the excitation, the test equipment automatically adjusts its natural frequency to the excitation frequency without any controllers. By applying this automatic adjusting mechanism to a vibration energy harvester, the generating efficiency under the situation that the excitation frequency of vibration changes is expected to be improved. However, the mechanism of the motion, how the oscillator automatically adjusts the natural frequency to the resonant frequency, have not been clear. Therefore, the optimum design has not been established, and the behavior has been poorly reproducible. In this study, we changed the shape of plate spring into concave shape in order to stabilize the resonance tracking phenomenon, and obtained an effective result. Details of the results are shown through some experiments by using high-speed cameras. As a result, we found that the plate spring moves in the horizontal direction during non-contact period with the base, and the amplitude of the vibration is large at the beam of the traveling direction side.