The diffractive optical element ( DOE) is designed using iterative phase retrieval algorithm. In the iterative algorithm, a new modification of far-field amplitude constraint is introduced to provide very high mode-conversion quality. 其中的衍射光学器件通过数值迭代位相恢复算法进行优化设计,在迭代算法中引入一种新的混和远场振幅约束,可以达到很高的模式转换质量。
Having been simplified by the linear approximation and the uniform-strati-fied assumption, the amplitude of free propagation ocean internal wave should satisfy hyperbolic partial differential equations and the constraint condition with the sea bottom and sea surface being stream line. 经过线性近似、海水均匀层化假设等一系列简化处理后,自由传播的海洋内波的振幅应满足双曲型偏微分方程和海底海面为流线的约束条件。
After great amplitude of sympathetic vibration region, axial constraint controls unbalance response and it is very prominent. 随后经过共振区的大幅振动之后,进入相对非常平稳的运转区间,此时轴向约束对于抑制转子系统不平衡响应起到比较大的作用;
An optimization mode was established, in which the dominant mode damping ratio derived from Prony analysis was introduced as the optimization objective and the modes amplitude ratio constraint was included. 引入了基于Prony分析的主导模式阻尼比作为优化目标,并且考虑了模式幅值比约束建立了优化模型。