arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.01693math.NAcs.NA
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广义Kirchhoff-Love板的稳定精确数值方法

Stable and accurate numerical methods for generalized Kirchhoff-Love plates

Duong T. A. Nguyen, Longfei Li, Hangjie Ji

摘要:

开发了有效和精确的数值算法来求解受三种常见物理边界条件约束的广义Kirchhoff-Love板模型:(i)夹紧;(ii)简支;和(iii)自由。我们解决了模型方程离散的空间导数使用二阶有限差分格式,然后推进半离散问题的时间与显式预测-校正或隐式Newmark-Beta时间步进算法。对这些格式进行了稳定性分析,并将分析结果用于确定实际中的稳定时间步长。一系列精心挑选的测试问题得到解决,以证明我们的数值方法的性能和应用。数值结果证实了算法的稳定性和二阶精度,并与类似薄板的实验也是可比的。作为一个应用程序,我们说明了一个战略,以确定使用我们的数值方法与快速傅立叶变换(FFT)的功率谱分析的计算数据的板的固有频率。然后,我们利用计算的自然频率之一,模拟有趣的物理现象称为共振和拍广义Kirchhoff-Love板。

英文摘要:

Efficient and accurate numerical algorithms are developed to solve a generalized Kirchhoff-Love plate model subject to three common physical boundary conditions: (i) clamped; (ii) simply supported; and (iii) free. We solve the model equation by discretizing the spatial derivatives using second-order finite-difference schemes, and then advancing the semi-discrete problem in time with either an explicit predictor-corrector or an implicit Newmark-Beta time-stepping algorithm. Stability analysis is conducted for the schemes and the results are used to determine stable time steps in practice. A series of carefully chosen test problems are solved to demonstrate the properties and applications of our numerical approaches. The numerical results confirm the stability and 2nd-order accuracy of the algorithms, and are also comparable with experiments for similar thin plates. As an application, we illustrate a strategy to identify the natural frequencies of a plate using our numerical methods in conjunction with a fast Fourier transformation (FFT) power spectrum analysis of the computed data. Then we take advantage of one of the computed natural frequencies to simulate the interesting physical phenomena known as resonance and beat for a generalized Kirchhoff-Love plate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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