The data regression processing method based on fuzzy mathematics theory is proposed to get the middle frequency band simulating result based on finite element result of low frequency band and statistics energy analysis result of high frequency band to get a complete frequency band result and solve the middle frequency band result processing problem in the simulation of floating raft isolation system 摘要为了解决浮筏隔振系统仿真结果的中间频段数据处理问题，基于浮筏隔振系统低频段的有限元分析结果和高频段的统计能量分析结果与试验结果的对比分析，提出采用模糊理论进行数据回归处理来得到中间频段的仿真结果，从而提出一种估算浮筏隔振效果的方法。
And classic pid control method and numerical pid control method have been introduced in the paper . the paper adopt stabilization border method to set the pid parameters and simulates the control system which is based on matlab / simulink . simulation results indicate that pid control ’ s simulation results have a good effect in low - frequency stage , but it is not perfect in mid - frequency and high - frequency stage 采用稳定边界法实现对pid参数的整定,并基于matlab / simulink对控制系统进行了仿真,仿真结果表明:低频段pid控制正弦跟踪曲线取得了良好的效果,而在中频和高频段时的跟踪效果不是很好, pid控制的阶跃响应超调量较大, pid控制三角波曲线的高频性能也不理想。
In general , a watermark system must satisfy the two basic requirements : imperceptibility and robustness . in this thesis , we proposed a frequency - based watermarking algorithm using toral automorphisms , in which a kind of toral automorphism is employed to mix a recognizable binary image ( bw ) , which contains the copyright information , into a noise - like signal 算法简单描述如下：首先用一个环形自同构映射把要嵌入的数字水印映射成伪随机噪声，然后把该伪随机噪声嵌入到宿主数据频域的低频段中，接着把得到的频域系数进行相应的逆变换得到嵌入水印的图象，最后对该嵌入水印的图象进行视觉掩蔽处理。
It shows that a disadvantag ekists when a crsi is used to measure a step structure in a wavefront , but it is useful to adjust a crsi system with lcslm . 4 . according to the didriction effect of an aperture , the spatial resolution of our crsi was analyzed and the transform function of our crsi was calibrated by using the psd method of a step wavefront . and some factors which are associated with the accuracy of our crsi were analyzed too 四、从光学系统衍射效应的角度分析了本文建立的环路径向剪切干涉仪的空间分辨率，并利用波前功率谱密度的概念对该干涉仪的空间频率响应特性进行了标定，分析了限制该干涉仪测量精度的主要因素以及径向剪切比与测量精度的关系，并指出了该干涉仪的测量范围，结果显示该干涉仪基本上可用于准确测量中低频段的波前畸变。
