用于非線性動力分析的一種高效精細積分單步法
發(fā)布時間:2018-10-26 13:51
【摘要】:針對非線性動力狀態(tài)方程v=H·v+f(v,t),結合精細積分法和Romberg數(shù)值積分,對計算過程中待求的v_(k+j/m)(j=1,2,…,m),利用當前時刻vk,通過二階龍格庫塔法進行預估,提出了一種避免狀態(tài)矩陣求逆的高效精細積分單步法。該方法計算格式統(tǒng)一,易于編程,通過選取m值,可進行不同計算精度的計算。與兩種單步法、一次預-校法及預估校正-辛時間子域法進行數(shù)值比較,計算結果表明,該方法具有高精度、高效率及較好的穩(wěn)定性。在求解多自由度、強非線性動力響應問題中具有較大優(yōu)勢。
[Abstract]:For the nonlinear dynamic equation of state (VX H v f (VT), combining the precise integration method and the Romberg numerical integration, the vk / j / m (J _ (k / j / m) (J _ (k / j / m), which is to be solved in the process of calculation, is studied. , m), uses the current time vk, to predict by the second order Runge-Kutta method and proposes an efficient precise integration single-step method to avoid the inversion of the state matrix. This method has the advantages of uniform calculation format and easy programming. By selecting m value, different calculation accuracy can be carried out. Compared with two single-step methods, one-step precalibration method and predictor-correction-symplectic time subdomain method, the numerical results show that the proposed method has high accuracy, high efficiency and good stability. It has great advantages in solving multi-degree-of-freedom and strongly nonlinear dynamic response problems.
【作者單位】: 中南大學土木工程學院;
【基金】:國家自然科學基金(50908230)
【分類號】:O241.4
本文編號:2295923
[Abstract]:For the nonlinear dynamic equation of state (VX H v f (VT), combining the precise integration method and the Romberg numerical integration, the vk / j / m (J _ (k / j / m) (J _ (k / j / m), which is to be solved in the process of calculation, is studied. , m), uses the current time vk, to predict by the second order Runge-Kutta method and proposes an efficient precise integration single-step method to avoid the inversion of the state matrix. This method has the advantages of uniform calculation format and easy programming. By selecting m value, different calculation accuracy can be carried out. Compared with two single-step methods, one-step precalibration method and predictor-correction-symplectic time subdomain method, the numerical results show that the proposed method has high accuracy, high efficiency and good stability. It has great advantages in solving multi-degree-of-freedom and strongly nonlinear dynamic response problems.
【作者單位】: 中南大學土木工程學院;
【基金】:國家自然科學基金(50908230)
【分類號】:O241.4
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