Abstract : this article builds the model of the muffler on basis of the transfer matrix method . the optimization model is developed , which the demand of muffler design is met in . on this basis , the authors make the program of calculation and optimum design . the optimization model is verified to be practical 文摘:本文运用传递矩阵法建立了消声器性能的数学模型,给出了兼顾消声器各项设计要求的优化设计模型,编制了计算机及优化程序,并进行了试验验证。
And use this optimization program computate the boom structure shape of heavy bucket - wheel stacker & reclaimer ; based on shape optimization , we use second optimization technology to optimize structure section size . the optimization results are satisfied . the computation indicates that considering the geometric nonlinear element can enhance the calculation efficiency and precision of optimization design evidently in sensitivity analysis 编制了空间刚架结构优化设计程序( 3dfem - opt . for ) ,并利用编制的优化程序对某大型斗轮堆/取料机前臂架在最大应力约束条件下,进行结构形状优化设计;在形状优化的基础上,采用二次优化技术,对结构的截面尺寸进行了优化。
Aimed at the shortage of ga , this paper improves the simple genetic algorithm and accomplishes the optimal program based on the adaptive genetic algorithm . the result shows that the adaptive genetic algorithm improves the convergence rate . generally , the genetic algorithm randomly generates the initial population 针对简单遗传算法的缺点,本论文提出了对简单遗传算法进行改进?自适应遗传算法,并且编制了基于自适应遗传算法的结构优化程序,算例分析表明得出自适应遗传算法确实提高了遗传算法在应用于结构优化设计方面收敛性和计算速度。
So it is appears important to analyse capability of this structure , the people can compute all kinds of complex structure ’ s response under different sorts of exact load on current software , but the source program of the computing question , which is “ black box ” , on the contrary , fepg can get the source program , which can provide preference for the optimization of structure , even embed in the optimizing program and save much time of compiling program , linking to ga to identify the load can get the good result . so the problem is solved to alleviate the deadweight and the optimize design of the structure , as well as improve its secure capability 对格栅结构进行力学分析就显得至关重要,尽管利用通用有限元软件能够计算结构承受任意可以准确描述的载荷作用下的响应问题,但内部计算却是“黑箱”操作,利用fepg可以得到计算源代码,能够为优化程序提供参考甚至可以嵌入其中,节省繁琐的有限元计算编程内容,结合遗传算法进行载荷重构,往往会收到很好的效果,这就解决了由于工作环境比较复杂,引起响应的载荷难以直接测量得到的难题,从而为结构优化设计和提高安全性能的提供了保障。
By means of the optimization method - punishing function method and taking the sum of the planet gear radius and center distance as the target function , the parameters of drive are optimized . by using the optimization program , the initial serial studies of drive are completed , the best serial parameter value of the drive is given 采用外点罚函数优化方法,通过取行星轮半径和中心距之和作为优化目标函数,对滚锥齿超环面行星蜗杆传动进行了参数优化,运用此优化程序,初步完成了对该种传动的系列化研究,给出了传动系列的最佳参数取值。
Graphical user interfaces are developed to be convenient for implementing of parameterized model and debugging of program parameters . program of optimization based on ga is designed to optimize obturating performance of the obturator of the breech mechanism , further , the effect of control parameters of ga and friction factor on the optimal structure is studied 开发了实施参数化建模和程序参数调试的界面,编制了遗传算法优化程序,对炮闩闭气结构进行了闭气性能优化,并研究了遗传算法运行的控制参数对优化结果的影响以及摩擦系数对最优结构形式的影响。
The theory and the implementation of the genetic algorithms are discussed in detail . the question on how to choose the crossover probability , the mutation probability , the scale of population and the numbers of the generation is discussed . then , the mathematics model of the optimal design is established 详细介绍了遗传算法的理论和实现技术,探讨了交叉概率、变异概率、群体规模、进化代数等变量的选取问题,建立起了基于遗传算法的深基坑支护结构设计的优化模型,结合弹性地基梁有限元法,利用fortran语言编制了gafortran优化程序,程序中包括普通遗传算法和改进遗传算法。
The programs of genetics algorithms and the improved genetics algorithm are developed with c . putting some basic parameters of earthquake and other design data in the intelligent optimal design ' s program , the analysis results of lateral stiffiiess ( sectional dimension of members ) , sectional reinforcement of members and structural inner forces will be gotten 在改进的遗传算法优化程序中,只需要输入一些基本的地震动参数及其他设计数据,就能给出结构侧移刚度优化结果(构件截面尺寸) ,同时还给出结构内力和构件截面配筋率等分析结果。
In order to assure that the stress and strain state of structure is secure , the author analyses respectively the objective functions of the reasonable finished state and buckle - cable adjusted phase ; thus , the optimized model based on fga is framed . finally according to the example , the computation datum are compared with the iterative forward analysis method and the optimal control theory . the result shows that this method can be used conveniently and meet the construction and design precision 为了满足大跨度钢管混凝土拱桥施工的安全性与成桥预期的内力状态和拱肋线形,本文结合工程实例,分别对合理成桥状态和扣索索长调整的目标函数的确定进行了分析,将一组多变量、多约束的最小化问题无约束化,从而建立起适合于该问题的遗传算法优化模型,将其计算结果分别与迭代前进法和随机最优控制理论进行了比较;结果表明,采用该方法编制的基于结构计算的遗传优化程序操作灵活,能很好的满足施工和设计要求。