The dynamic design of the foundation of the specific 12 , 000kw steam turbine - generator set is carried out . the style of the foundation is confirmed as framed foundation . according to the model of foundation dynamic responses are calculated by large - scale analysis software , sap90 , finally , multiple designs of the foundation are compared to gain some useful conclusions 包括确定该基础的结构型式，建立基础的计算模型，利用有限元分析软件sap90对其进行固有特性和动力响应计算，并对计算结构进行分析后又进行了多方案的比较，从中得出?些有意义的结论。
This paper studies the rational b - splines curves with prescribed poles and surfaces for the first time , and studies the properties of this new surface modeling . the result indicate that this modeling not only have the property of geometric modeling , but also have the agility and availability , and score the singular of curve 本文首次构造了指定极点的有理b样条曲线曲面,并深入研究了这种新颖曲面模型的性质,结果表明该有理曲面模型不仅具有几何造型的特点,而且更灵活、更有效,并能刻画曲线的奇性等固有特性
In matlab software , we realized compute program on antenna structure design optimization and acquired the prime structure parameters . throw the analysis of the natural characteristic , we find an effective algorithm to enhance the base frequency and give a reference for the structure design of antenna . by the antenna structure optimum design , we obtain the optimum design results and solve a complicated structure design optimization problem with lots of finite element computation , multiple targets and multiple disbursed variants 通过对天线的固有特性分析，找到了提高天线系统基频的有效途径，为天线的结构设计提供了依据；通过天线的结构优化设计，获得了天线结构的优化设计结果，解决了带有大量有限元计算、多离散变量、多目标相结合的复杂的结构优化设计问题。
Due to the intrinsic characteristics of the gaas material , semi - insulating ( si ) gaas pcss ' s have more obvious advantages in the performance of both high power and ultra - fast switching than those pcss ' s made of other materials . the gaas pcss ' s can take on the particular phenomenon of lock - on effect when the thresholds of activating optical energy and bias field , which the devices demand , are meted simultaneously 然而，由于gaas材料的固有特性，半绝缘gaas光电导开关在其工作性能上有明显的优点，特别是在一定的光能和电场阈值条件下， gaas光电导开关能产生lock - on效应现象，所以gaas光电导开关的器件研究和实际应用开发成为光电导开关研究者所关注的焦点。
The rigid and flexible trusses were simulated respectively . the dependences of the attitude angle degree and angle velocity of the spacecraft on the rigid and flexible situation in the deployment process and drive velocities loaded on the joints were derived . the frequency - amplitude characteristic curves were gained from the attitude angle velocity curves of the deployment of the flexible truss and locked flexible truss after deployment through the fast fourier transition ( fft ) method 文中给出了展开前后的动力学固有特性;对展开过程中分别为刚性桁架和柔性桁架两种情况进行了仿真计算,对比了两种情况的桁架展开过程中卫星姿态角及姿态角速度的变化;比较了柔性桁架不同展开速度对卫星姿态角及姿态角速度的影响;分析了柔性桁架展开过程对卫星非展开方向的姿态角度及角速度的影响及原因;对柔性桁架展开过程中及展开锁定后的卫星姿态角速度的变化曲线进行快速傅立叶变换,得到柔性桁架展开过程即展开锁定后卫星姿态角速度的频幅特性曲线。
The dynamic model of misaligned rotor - bearing system equipped with a flexible laminated membrane coupling was developed by using the method of lumped parameter in this dissertation , and the dynamic behavior , such as the nature characteristics , stability , steady state response of the system , etc . was analyzed based on the theory of linear vibration 本文根据集总参数法建立了膜片联轴器耦合的不对中转子?轴承系统的动力学模型。基于线性振动理论分析了系统的固有特性、稳定性和不平衡响应。
