At last we present the result and data in visualization , including main menu and online display window , initialization window , data processing record window , analog signal scale and result examining window , wave testing window etc 包括主菜单及实时显示窗口、初始数据输入窗口、断火次数显示窗口、数据处理记录窗口、模拟量的标定及查看标定结果窗口、波形测试窗口等。
In the paper , many methods of harmonic analysis are described in detail above all , because they are the important means by which the rudimental data that various harmonic emission estimation methods require can be attained , and influence the final results 在本文中，首先对谐波分析的方法进行了详细叙述，因为对谐波的分析是各类谐波发射水平估计方法所需初始数据的获得方式，同时也影响最终估计的结果。
For the process of synthesizing of phosphonic acid dimethyl , the significance of application of mspc on it is discussed , the parameters and original data are deduced and estimated , and process monitoring and diagnostic simulation are given based on simplified model 对于亚磷酸二甲酯生产过程，论述了对其进行多变量统计过程控制的意义，对该生产过程的物性参数和初始数据进行了推导和估计，并在经过简化的生产控制模型基础上进行了多变量统计过程监控和诊断仿真。
With the help of the electronic computers , engineers employ it to figure out nearly all kinds of engineering problems ranging from astronavigation , construction , waterpower projects , ship - building and mechanical engineering etc . owing to the strong power of finite element method , one kind of software pack which based on the method is exploited and named algor feas to resolve problems on structure analysis for trusses and shells . this paper also employ algor feas software pack to analyze and compute the cableway towers , giving the accurate result on stress and displacement both in location and whole . finally , we also bring out some advice on structure improving 在此分析过程中：首先将物理模型简化为力学模型，主要是将塔架结构按空间杆单元简化为空间桁架结构，目的是将力学模型变换为数学模型；这一过程主要是利用autocad2000建立塔架的计算模型；再者，利用algorfeas软件包读入autocad建立的塔架计算模型生成初始数据卡利用计算机进行编程进行风载计算，再将计算结论整合入algorfeas产生的初始数据卡中，生成计算数据卡；接着，利用algorfeas软件包计算塔架在不同载荷情况下的应力图，位移图，并且求出在不同载荷条件下的最大位移和最大应力等；然后，对塔架的稳定性进行分析；最后；根据计算结果提出改进建议。
This paper describes an aag ( attributed adjacency garaph ) based method of machining features recognition for shaft kind parts and 2 . 5d parts on the acis platform , which can effectively recognize the main and assistant feature of these kinds of parts . using the class library provided by acis , all the geometrical information for defining a feature can be acquired . finally a xml neutral file describing the recognition result is provided for the later capp process and the generation of nc code 本文首先分析三维实体边界模型的特征识别方法及其特点,继而采用基于属性邻接图的特征识别方法,研究了轴类零件及2 . 5维零件的加工特征的分类及其识别,并在acis平台上开发了相应的软件原型系统,有效地识别该类零件的主特征和常见的辅助特征,且利用acis提供的类库接口提取模型底层的几何参数,得到定义各项特征所需的几何尺寸信息,最后以xml中性文件的形式输出识别结果,为后续进行的工艺规划、加工代码生成提供初始数据,从而为cad / capp / cam的集成提供有效的方法。
This feature reflects the physical phenomenon of breaking of waves and development of shock waves . in the fields of fulid dynamics , ( 0 . 2 . 1 ) is an approximation of small visvosity phenomenon . if viscosity ( or the diffusion term , two derivatives ) are added to ( 0 . 2 . 1 ) , it can be researched in the classical way which say that the solutions become very smooth immediately even for coarse inital data because of the diffusion of viscosity . a natural idea ( method of regularity ) is obtained as follows : solutions of the viscous convection - diffusion pr oblem approachs to the solutions of ( 0 . 2 . 1 ) when the viscosity goes to zeros . another method is numerical method such as difference methods , finite element method , spectrum method or finite volume method etc . numerical solutions which is constructed from the numerical scheme approximate to the solutions of the hyperbolic con - ervation laws ( 0 . 2 . 1 ) as the discretation parameter goes to zero . the aim of these two methods is to construct approximate solutions and then to conside the stability of approximate so - lutions ( i , e . the upper bound of approximate solutions in the suitable norms , especally for that independent of the approximate parameters ) . using the compactness framework ( such as bv compactness , l1 compactness and compensated compactness etc ) and the fact that the truncation is small , the approximate function consquence approch to a function which is exactly the solutions of ( 0 . 2 . 1 ) in some sense of definiton 当考虑粘性后，即在数学上反映为( 0 . 1 . 1 )中多了扩散项(二阶导数项) ，即使很粗糙的初始数据，解在瞬间内变的很光滑，这由于流体的粘性扩散引起，这种对流-扩散问题可用古典的微分方程来研究。自然的想法就是当粘性趋于零时，带粘性的对流-扩散问题的解在某意义下趋于无粘性问题( 0 . 1 . 1 )的解，这就是正则化方法。另一办法从离散(数值)角度上研究仅有对流项的守恒律( 0 . 1 . 1 ) ，如构造它的差分格式，甚至更一般的有限体积格式，有限元及谱方法等，从这些格式构造近似解(常表现为分片多项式)来逼近原守恒律的解。
In order to implement the proposed numerical procedure , a two - module computer program is developed with the computational module in visual fortran code and the input - output module in visual basic code . using the program the initial data can be interactively entered and the results can be graphically obtained 为实现上述数值分析方法，采用visualfortran语言编制了相应的计算机程序，同时用visualbasic语言开发出了可视化输入输出模块，利用该模块可以实现初始数据的交互输入和计算结果的图形输出。
Most of partial differential equation arising from physical or engineering science can be formulated into conservation form : it directly reflects conservation laws in natural sciences . from viewpoints of fluid dynamics , it can be obtained from the mass , momentum , energy conservation laws . because the form ( 0 . 2 . 1 ) has no other terms such as dispersion , diffusion ( caused by nonuniformity of some physical states ) , reaction , memory , damping and relaxation etc , smoothness of solution of ( 0 . 2 . 1 ) may be loss as times goes on . even for the smooth inital data , solutions of ( 0 . 2 . 1 ) become discontinuous in a finite time 由于双曲守恒律( 0 . 1 . 1 )没有其它项，如色散( dispersion ) ，扩散( diffusion ) (某物理量分布不均匀引起的输运) ，反应( reaction ) ，记忆( memory ) ，阻尼( damping )及松弛( relaxation ) (描述非平衡态)等，而仅有输运或对流项( convection ) (由于流体的流动引起的输运)时，守恒律( 0 . 1 . 1 )的解失去光滑性(这里不特殊说明守恒律就指该意义下) ，甚至即使光滑的初始数据，解随着时间的发展会变成不连续，这在物理上表现为激波的形成。
