頁籤選單縮合
題名 | Dynamic Stability of Timoshenko Beam Resting on a Viscoelastic Foundation=靜置於黏彈性基底上提摩盛科樑的動態穩定性 |
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作者 | 黃健生; 馮榮豐; 陳文祥; |
期刊 | 中原學報 |
出版日期 | 19911200 |
卷期 | 20 1991.12[民80.12] |
頁次 | 頁40-51 |
分類號 | 440.13 |
語文 | eng |
關鍵詞 | |
中文摘要 | This paper studies the dynamic stability of Timoshenko beam subjected to periodic axial loads and resting on a viscoelastic foundation by the finite element technique. We investigate the effects of viscoelastic foundation and various end-conditions of Timoshenko beam on the regions of dynamic instability. The results indicate that an increasing in the foundation stiffiness or damping will increase the critical dynamic load and shifts the regions of instabi1ity toward a higher frequency direction. Due to the efflffcts of rotatory inertia and transverse shear deformation, the regions of dynamic instability are shifted closer to each other and the sizes of these regions are increased. The results obtained for Euler beam show agreement with the available results by analytical methods. |
英文摘要 | 本文乃利用有限元素法研究靜置於黏彈性基底上受一軸向週期力作用之提摩盛科樑的動態穩定性。我們將探討提摩盛科樑之黏彈性基底和不同邊界的端點狀況對於動態不穩定區域的影響,其結果顯示若增加黏彈性基底的剛度或阻尼大小,將增加其臨界動態負荷值,並且這些不穩定性區域將往較高的頻率方向偏移。又因旋轉慣性和橫向剪力變形量的影響,使得這些動態不穩定性區域,彼此間的距離更靠近,且其區域範圍的大小會變大。本文亦探討歐拉樑的動態穩定性,而所得的有限元素結果跟已有文獻利用解析法或數值法所得之結果比較相當吻合。 |
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