An Improved Method of the Transient Waveform Analysis in Power Systems

The angular frequency and decaying constant of each copmonect for the transient waveform in power systems were obtained by using the discrete Fourier transform; the amplitude and phase angle were calculated in the linear curve fitting method. And all of the parameters obtained above were treated in an unified optimization by using the curve fitting optimization of the least square method of general nonlinear funcrion so as to get the results of waveform analysis. Two examples are included.     

The Software System for Computation and Drawing of Ship Properties

The softwa re system suggested in this paper is applied to replace the traditionalhanded-computation forms. It uses the cubic sample interpolation and numerical integral,and is writ-ten with FORTRAN according to the accurate formula. With this software system,the nine sorts ofcomputation results of ship properties can be obtained. The system is con nected through SCR filewith AutoCAD,and ean draw automatically eleven sorts of pictures according to the computation re-sults.     

Around Body Flow Computation with Vortex-Flow-streamFunction in Boundary Fitted Coordinates

In this paper, partial differential equations of vortex flow-stream function in boundary fitted coordinates and related ADI equations were listed. The flow around a cylinder in quadrilateral area by auto control boundary was computed. The diagram of distribution of speed arrow, constant lines of flow-stream function, vortex, two speed parts and pressure were studied.     

Avoiding Obstacle Planning for Robots on Molecular Optimization Algorithm

Interest in DNA computing has increased overwhelmingly since Adleman successfully demonstrated its capability to solve Hamiltonian Path Problem. This article introduces the improving method in virtue of the biological thery of DNA technology, a new molecular algorithm is advanced. After a numerical simulation, the result shows that it avoids the prematurely and lower convergent speed of the classic genetic algorithm, and inherits global search capability, the validity and the speed of the genetic algorithm have been increased. The best result can be obtained in few iterative times. It is fit for solving path planning problem.     

分叉管流动的数值模拟

采用非结构、非均匀的网格和有限元方法,通过求解Navier-Stokes方程,对90°分叉管的流动进行了并行数值模拟的研究。计算网格为500000个有限单元,计算Reynolds数为1500。计算结果给出了90°分叉管详细的流动结构。     

“数字清江”实时水情调度联合计

为了快速、准确的分析水情实况、预测未来的发展趋势，结合清江流域防洪减灾工作实际情况，设计了实时水情调度联合计算方案。根据清江流域地理位置的特点，将其分为7个子流域，依次进行降雨径流预报、洪水演算，为防洪减灾提供真实有效的决策依据。通过对该方案的分析，探讨了设计思路，并给出了其实现机理。该方案已在“数字清江”项目中得到成功应用。     

利用MATLAB计算切割图中三区域的面积值

切割器是收割机的主要工作部件,它的工作性能直接影响收割机的性能。为此,介绍了利用MATLAB软件对标准往复式切割器在一定工作条件下切割图中3个区域面积的计算方法和计算过程,这将对于切割器的性能评价及工作参数的选择具有重要的作用。     

离心泵非定常流动计算及性能预测

采用以SSTk-ω模型封闭的雷诺平均方程和滑移网格技术计算了离心泵内的非定常流场.基于非定常流动计算结果,考虑容积损失、圆盘摩擦损失和机械损失,对离心泵的性能进行了预测,并与实测性能曲线进行了比较.结果表明,在给定进口速度的条件下,由于叶轮与蜗壳隔舌的相对位置不同,泵的扬程和轴功率有比较大的脉动,且其脉动幅值随流量的增大而增大.定常流动计算和非定常流动计算所预测的性能曲线在大流量与设计工况时相差不大,在小流量时有明显的差别.与试验曲线相比,预测的扬程曲线偏低,轴功率曲线也偏低,效率曲线比较接近.由于在设计工况时定常计算和非定常计算差别不明显,在设计过程中采用定常计算是可行的.     

基于量子神经网络的马铃薯早疫病诊断模型

针对马铃薯早疫病智能诊断,将量子计算的态叠加方法和神经网络计算的自适应性结合,提出了将量子神经网络作为马铃薯早疫病诊断模型.该模型隐含层采用多个量子能级的激励函数叠加的量子神经元,有效地解决了病害诊断中模糊决策,在给出的学习算法的训练过程中自适应地确定样本特征数据中的不确定性.此算法能够较好地避免传统神经网络在训练过程中易出现局部极小值的弊端,提高了网络学习速度.仿真结果表明:量子神经网络在马铃薯早疫病诊断中,诊断正确率达到96.5％.     

薄板冲压成形时表面质量状态的分析

以薄板冲压为例,在冲压成形缩条情况下,根据希尔理论利用有限元法分析成形件的表面状态,得出了计算有的条件和方法,为薄板在冲压成形时产生表面不规则变形的分析提供了理论依据。