多跨的三種梁的橫向自由振動模型
發(fā)布時間:2018-11-07 17:38
【摘要】:運用了參數(shù)變易法對Timoshenko、Rayleigh和Shear梁的橫向自由振動模型進行了推導,分析了鉸支座、集中質量、轉動慣性、拉壓彈簧和扭轉彈簧的復雜邊界條件的情形,進而給出了帶有多個復雜邊界條件的三種梁的自由振動模型。在其簡化的Euler梁下對三個有一定工程實踐意義的模型進行了推導,分別是雙跨梁、雙跨梁帶有任意個集中質量和單跨梁帶有任意個拉壓彈簧的自由振動模型,三個模型的頻率方程的結果與已有文獻的結果相比具有很好的一致性。并運用Nastran將雙跨梁進行了算例分析,該方法提出的公式計算的一階頻率與有限元方法得出的一階頻率之差小于5%,表明提出的模型是合理可用的。
[Abstract]:The transverse free vibration model of Timoshenko,Rayleigh and Shear beams is derived by parameter variation method. The complex boundary conditions of hinged bearing, concentrated mass, rotational inertia, tension spring and torsional spring are analyzed. Furthermore, the free vibration models of three kinds of beams with complex boundary conditions are given. Under its simplified Euler beam, three models of engineering practice are deduced, which are two span beam, two span beam with any concentrated mass and one span beam with any tension and compression spring. The results of the frequency equations of the three models are in good agreement with those obtained in the literature. The difference between the first order frequency and the first order frequency obtained by finite element method is less than 5, which shows that the proposed model is reasonable and usable.
【作者單位】: 南京航空航天大學機械結構力學及控制國家重點實驗室;
【基金】:國家自然科學基金(51105197;51075203) 江蘇高校優(yōu)勢學科建設工程資助項目
【分類號】:V214
[Abstract]:The transverse free vibration model of Timoshenko,Rayleigh and Shear beams is derived by parameter variation method. The complex boundary conditions of hinged bearing, concentrated mass, rotational inertia, tension spring and torsional spring are analyzed. Furthermore, the free vibration models of three kinds of beams with complex boundary conditions are given. Under its simplified Euler beam, three models of engineering practice are deduced, which are two span beam, two span beam with any concentrated mass and one span beam with any tension and compression spring. The results of the frequency equations of the three models are in good agreement with those obtained in the literature. The difference between the first order frequency and the first order frequency obtained by finite element method is less than 5, which shows that the proposed model is reasonable and usable.
【作者單位】: 南京航空航天大學機械結構力學及控制國家重點實驗室;
【基金】:國家自然科學基金(51105197;51075203) 江蘇高校優(yōu)勢學科建設工程資助項目
【分類號】:V214
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