Moreover the vibration frequencies of the plate are comput-ed using iterative method, which begins with the in vacuo eigenfrequency and continues until in-water eigenfrequency con-verges.

• 从真空中模态特征频率出发用迭代法直到水中频率收敛为止而得到水中方板的特征频率，进而计算了方板的棤态辐射效率。