In the end of this thesis , basis on the structure dimension of a specifically submarine , some solutions for strengthening structure are discussed , such as increasing the thickness of shell , reducing the spacing of frames , increasing the bending inertial moments of frame and setting the intermediate stiffer , when the extreme diving depth becomes 450m or 600m . comparing these structure weights , the excellent solution is the lightest structure 本文最后以某核潜艇指挥舱的结构形式作为计算实例，对下潜深度分别增加到450米和600米的情况，选择增加壳板厚度、缩小肋骨间距、增加肋骨尺寸以及加设中间支骨等加强方案，经分析确定其中结构重量最轻的方案为最佳设计方案。
First , based on the analysis of the design method of two - valued shift counter , we use the multivaled circuit ' s property of high information density to put forward the design method of three - valued shift counter . by using this method module - n three - valued shift counter can be designed . and by selecting the best design method , the simplest circuit of control logic can be made 首先，在分析二值的移位计数器的设计方法的基础上，利用多值电路的高信息密度，提出了三值移位计数器的设计，运用该方法可以设计任意状态的三值移位计数器，并且通过选择最佳设计方案使控制逻辑电路最简。
In our experimentation , we combine fiber bragg grating with tb - dy - fe single crystal , we can measure the current which produces the magnetic field when we measure the shift of bragg wavelength because of magnetostrictive strain of tb - dy - fe single crystal in magnetic field , we also study the relation between bias field , strain of current sensor 本实验将光纤布拉格光栅与tb - dy - fe结合起来，利用tb - dy - fe在磁场下的伸缩引起布拉格波长的改变，来测量产生磁场的待测电流的大小。在实验中我们还研究了偏场，预应力与传感器的关系，在这个过程中我们找到了与传感器有关的最佳设计参数。
Through contrastively stimulating many models of axial fan which are made by changing some primary geometrical parameters that effect on fan ' s performance , then we can aquire the reason and degree that each parameter effects on the axial fan ' s performance , based on the analyst for the result of stimulation , regarding fan ' s efficiency as target and making use of optimal design method , we improve on parameters which effect on axial fan performance , achieve the axial fan best design project at last through computing again and again 在采用工程设计方法? ?孤立叶型法初步设计轴流通风机的基础上，运用cfd软件? ? fluent对所设计的轴流风机进行了三维数值模拟，获得了轴流风机内部许多重要流动细节、规律及其性能参数，并对影响轴流风机性能的主要几何参数进行了对比模拟，从而可获得各参数影响轴流风机性能的原因和影响程度。在结果分析的基础上，运用优化方法以效率为目标，对影响轴流风机性能的主要参数进行了改进设计，通过反复计算最终完成轴流风机的最佳设计。
