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对于求解波浪与大型结构物作用的pFFT方法,即预修正快速傅里叶变换方法(Pre-corrected Fast Fourier Transform),该文提出了消除“不规则频率”影响,从而保证在各频率下均可得到正确解的求解技术。该方法通过在内水面上配置源点的方法得到了唯一解的积分方程,并通过叠加物体内部积分方程而得到了便于求解的方形矩阵。算例表明:该方法能够消除“不规则频率”的影响,在整个频率内均可得到精确的计算结果;对于大型计算,在计算效率和内存空间的使用上,均较传统的高阶边界元方法有很大优势。
For the pFFT method to solve the effect of waves and large structures, ie, Pre-corrected Fast Fourier Transform, this paper proposes to eliminate the influence of “irregular frequency” to ensure that at each frequency Can get the correct solution of the solution. In this method, the integral equation of the unique solution is obtained by disposing the source point on the inner water surface, and the square matrix which is easy to be solved is obtained by superposing the integral equation inside the object. The example shows that this method can eliminate the influence of “irregular frequency ” and obtain accurate calculation results in the whole frequency. For large-scale calculation, the computational efficiency and the use of memory space are higher than the traditional higher order The boundary element method has great advantages.