In this paper , a generalized hybrid finite strip method is deduded for analyzing the shear lag effect in box girders . it has the advantage of the generalized finite strip method and hybrid stress element . shear lag effect in thin - walled box girder is analyzed with this method and stiffness matrix of generalized hybrid finite strip element is deduced . a calculating program for thin - walled box girder " s generalized hybrid finite strip method is compiled with fortran language and performed in visual fortran environment of pc computer . a typical example demonstrates that the proposed method has higher accuracy and efficiency , is suitable for analysis of shear lag effect in box girders 本文结合应力杂交元法和广义有限条法导出一种用来分析箱梁剪力滞效应的广义应力杂交有限条法，它兼有应力杂交元和有限条法的优点。运用这种方法对薄壁箱形梁的剪力滞效应进行了分析，推导出广义应力杂交有限条元的单元刚度矩阵，用fortran - 77语言编写薄壁箱形梁广义杂交有限条法程序( hfsbg . for )在visualfortran环境下运行。具体算例的数值结果表明：广义应力杂交有限条法用于计算箱形梁的应力分析具有很好的精度和效率，适合于分析箱形梁的剪力滞效应。
Scientific computation visualization interactive virtual reality computer dynamic simulation etc . , to study thoroughly and carefully on critical technologies such as mixed - language programming simplification of scene models displaying realistic image and animation of 3d scene models and so on in this dissertation , the methods to build scene models were studied and applied to develop a dynamic simulation system of 3d railway scene based on this idea , the major study contents and results can be summarized as follows : 1 ) mixed - language programming can complement each other between different programming languages and the method has a general significance and can become popular many computation models including development of dtm optimum of dtm and reorganization of dtm were developed with fortran language in order to use the ripe codes , the dissertation succeeded in integrating the developed fortran codes to the visual c + + environment and achieving the course of mixed - language programming 2 ) the methods to build scene models for 3d location design were discussed in the dissertation and the development and animation of scene models had been realized by applying synthetically those technologies such as computer graphic computational geometry and geometrical modeling and computer dynamic simulation etc , and adopting opengl 3d graph library then achievement was got by using the technology of 3d visualization to livingly express design results 3 ) combing with the concerned study and development projects , adopting vc + + as development tools and in the light of those theories and algorithms stated in this dissertation , a software , which could build scene models with realism for 3d railway location design , in the name of " the dynamic simulation system of 3d scene of railway " was developed . , the correctness was proved by using the software to build the 3d scene models and achieve their animation of suining - chongqing railway and yunnan - xizang railway 本文综合利用计算机图形学、科学计算可视化、人机交互、虚拟现实、计算机动态仿真等理论和技术，针对混合语言编程、真实感图形绘制以及三维景观模型的动画驱动等关键技术，进行了深入细致的研究，从而探讨了建立逼真景观模型的方法，并基于本文提出的方法研制了一个铁路线路三维景观动态仿真系统。基于这一思想，本文主要研究内容及研究成果如下： 1 )混合语言编程可以实现语言优势互补，具有普遍意义。针对数字地面模型的建立、优化、重组等计算模块是成熟的fortran程序代码，本文成功实现了vc + +与fortran语言的混编； 2 )紧紧围绕三维选线设计中景观模型的建立方法展开研究，综合利用计算机图形学、计算几何及几何造型学以及计算机仿真技术，采用opengl三维图形库，实现了景观模型的建立以及动画驱动，使得三维可视化技术成功应用于选线设计成果的三维直观表达； 3 )结合有关科研课题，利用vc + +开发工具，以本文所述的理论和算法为基础，研制和开发了一个建立三维选线设计逼真景观模型的系统软件- - “铁路线路三维景观动态仿真系统” 。
Because of continuity of load effects in time and space , displacement effects of previous time period in the latter time period and effects in various places have been taken into accounts . it is on these basis that the paper puts forward the dispersed counting way discrete algorithm based on such relationship , takes time - stepping integration to calculate rails " dynamic response , uses fortran language to write counting program , and conducts computer mock tests about rails " power response 由于荷载作用在时间和空间上的连续性，因此考虑了前一时间段所产生的位移对后一时间段的影响以及不同位置的相互影响，在此基础上提出了基于车轮、轨道、枕木相互关系的离散化算法，采用时间步长积分计算了轨道的动力响应，使用fortran语言编制计算程序对轨道动力响应进行了模拟。
For practical purpose , an one - dimensional unsteady lumped model and a onedimensional unsteady stage - by - stage model , which are able to describe the dynamical post - stall behavior of compression systems , are derived firstly and then solved using the numerical methods to analyze the post - stall behavior and recoverability of compression systems . on the basis of characteristics of digital simulation of unsteady flow , the program for one - dimensional unsteady lumped model has compiled and tested under visual basic 6 . 0 environment completely . while the program for onedimensional unsteady stage - by - stage model has compiled and tested under foitran / visual basic mixed - language environment , which part of calculation is accomplished by fortran language 根据非定常流数值模拟的特点，通过可视化编程方法，用visualbasic6 . 0编写和调试了一维非定常总体模型的数值模拟程序；用visualbasic6 . 0制作界面，以fortran作为后台计算程序，编写和调试了一维非定常单元容积模型的数值模拟程序，成功地实现了vb与fortran的连接；使得数值模拟程序的界面友好，操作简单。
Thirdly , at the platform of adams , the virtual prototype of the model is founded , by using the toolbox of adams and fortran language to apply constrains and forces to the parts of the model . using the virtual prototype , dynamic simulations of the multi - rigid - body gun system are carried out under the conditions of single , repeating and planar revolving shoots 在adams软件平台下，结合fortran语言，对航炮系统的各个部件施加约束和力，编写仿真脚本文件，建立航炮系统虚拟样机，进行了单发、连发和平面扫射的多刚体系统动力学三维可视化仿真。
On the theory analysis , the post insulator structure is divided to triangle cell and electric field distribution including cleanness and covered with snow or ice etc is calculated by finite element method using fortran language . then the results are analyzed and the point of max electric strength was found 在理论分析方面，采用有限元方法对支柱绝缘子进行三角单元剖分，应用并修改fortran语言做电场计算程序，计算了无冰雪、冠雪、覆冰等三种情况下的电场分布，绘制了等位线图。
