(64)　Robust Control for the Vibration Attenuation of Superstructures

W.J.Hsueh(National Taiwan Univ.)

A robust control methodology applied for active vibration reduction on superstructures using the H ∞ synthesis is presented. Based on this technique, the control law may be calculated according to the required objective. The results show that the active vibration control system designed by this scheme has an effective vibration attenuation for both wind gust and hull oscillate excitations. This controller also has high robust for parameter perturbation.

　

(65) Low Velocity Impact Behavior Analysis of Sandwich Beam Used in Ship Structures

Ya-Jung Lee, Yau Shyu (National Taiwan Univ.)

Low-velocity impact behavior of sandwich beam is investigated numerically. Maximum stress failure criterion and a modified stiffness degradation method are adopted. The two failure modes; shear cracks in foam (Mode I), and crushed in core and damage in top face sheets right underneath the impactor (Mode II) can be simulated well. At the range of impact velocity in this study, the dynamic response is nearly quasi-static.

　

(66)　微小水撃角における弾性平板の水面衝撃の研究

角　洋一,向井広樹,井上弘一(横国大)

岡田真二(住重)

弾性平板を用いて小さな水撃角での衝撃試験を行い,水撃現象が水撃角βにより以下の領域に別れることが明らかとなった。

　

(67)　破壊靭性試験の構造性能評価へのTransferabiliｙを考慮した破壊靭性要求

-破壊制御設計へのローカルアプローチの展開(第1報)-

南二三吉,大畑　充,豊田政男(阪大),有持和茂(住友金属)

靭性試験片と当該構造要素が同じWeibull応力をもつ負荷レベルを結びつけて破壊靭性要求値を決定する手法を提案し,?本手法では従来法に比べて靭性要求が大幅に緩和できること,?溶接部靭性要求と強度ミスマッチの関係の評価手順を示した。

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