1 0 0 0 OA 有限要素法によるテーパーコイルばねの剛性設計
- 著者
- 小山 弘樹 有川 秀一 納冨 充雄
- 出版者
- 日本ばね学会
- 雑誌
- ばね論文集 (ISSN:03856917)
- 巻号頁・発行日
- vol.2022, no.67, pp.27-33, 2022-03-31 (Released:2022-10-01)
- 参考文献数
- 7
A tapered coil spring is the one whose wire diameter isn't constant and continuously changes. The spring possesses the non-linear stiffness which increases with increasing the load applied. Although its application is the axle spring for railway car because of passively changing the stiffness under the applied load that relates the number of passengers, making formula is difficult due to the gradually diameter change of tapered wires. Finite element method has often been applied to the analysis of mechanics for the springs and it should be found the appropriate end turn shape of the springs for real deformation of the coil and we found the optimized end turn for constant deformation. The stiffness of the spring follows the approximate formula on each region in different diameter before contact between wires and the formula on the region of thick wire after contact. The stiffness of the spring actually could be determined for varying the pitch and predicted using finite element method.
1 0 0 0 OA 外乱振動下で使用可能なスペックル干渉ナノメートル変位測定法の開発
これまでレーザ干渉計測を適用できなかったランダムな外乱振動下で,スペックル干渉法による面内2軸方向の変位分布測定方法を確立した.多数の画像から干渉可能な画像を選出することで,500mW以下のレーザでも測定可能な手法を確立し,3脚に設置可能な小型干渉計を構築した.さらにレーザの偏光を利用した分離方法および位相解析を適用可能にすることで面内2軸方向の変位分布・ひずみ成分を取得可能にした.そのためこれまでレーザ干渉測定が困難であった様々な現場でのスペックル干渉測定が可能になり,多くのひずみ測定実験や非破壊検査技術への応用が期待できる.