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Based on genetic algorithm,a new hybrid coding method using the integer and floating number was presented. The enumerable method guarantees each individual in the population to satisfy the constrains, thus the punishment function was avoided. The two adjustable parameters made the evolution process jump out of the local best solution perfectly.The application of the fitness assignment based on Pareto ranking attained inferior solution set of the multi-objective and multiple options were provided to the decision-maker.
设计了一种新的整数和浮点数结合的编码方式;通过列举法使得每代个体满足约束条件,避免了罚函数的使用;可调整的双参数变异算子使进化过程能够较好地跳出局部最优解;应用基于Pareto排序的适应值分配方式得到目标函数的非劣解集,为决策者提供了多种选择方式。
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We should do our best to protect and improve our ecological environ
我们要努力保护和改善生态环境,使经济发展既满足当代人的需要,又造福于子孙后代。
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Points out questions of matching technology for flash furnace and the contents of expansion and reconstruction to improve the capacity and equilibrate in production.
通过对金隆闪速炉炼铜现状的分析,指出了目前与闪速炉配套的其他工艺存在的问题,讨论了扩产改造的内容,以满足闪速炉35万t熔炼的要求,使辅助设施和生产相配套,实现产能扩大和均衡生产。
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The following points are emphasized:The operation models of adiabatic and diabatic distillation have been set up and the operation block, thermodynamics model and mathematical model in the simulation have been determined as well;(2)Based on the simulation and exergy analysis with Aspen Plus program, shortcut distillation design—DSTWU model and rigorous distillation design—RADFRAC model, the author has determined the heat duty, exergy losses and the distribution of exergy losses along the adiabatic column, which will help the simulation and optimization of the diabatic distillation;(3)Diabatic distillation under various operation conditions has been simulated by using energy balance method and exergy analysis;(4)How the different mixture and the various degree of separation, number of trays and feed location influence exergy saving in diabatic distillation have also been discussed;(5)On the basis of the total exergy losses along the column, different schema of the heat transfer distribution along the column have been compared and analyzed;they can be classified in three categories: heat duty equipartition approach, empirical approach, separation degree matching approach. In conclusion, different heat transfer distribution along the column will have effect on total exergy losses. In particular, most satisfactory results have been obtained by using separation degree matching approach. In order to diminish the exergy losses, heat transfer distribution should meet the needs of the request of separation degree.And on this premise, the author makes his suggestion in increasing the proportion of heat supplied to the tray with minimum exergy losses and decreasing the proportion of heat supplied to the tray with the maximum exergy losses.
本文对透热精馏过程进行了模拟并对其节能效果的影响因素做了较为全面的分析和深入的研究,主要研究内容如下:(1)建立了常规精馏和透热精馏过程的模拟操作模块、热力学模型以及数学模型;(2)利用化工模拟软件Aspen Plus并分别采用DSTWU简捷模型和RADFRAC严格计算模型对常规精馏进行模拟计算和有效能分析,确定常规精馏塔的公用工程热负荷、有效能损失及有效能损失在塔内的分布,为透热精馏的模拟和优化提供数据参考;(3)对不同物系在不同分离度条件下进行透热精馏的模拟,分别采用能量衡算法和有效能分析法进行计算和分析;(4)探讨了各种因素如物系的选择、不同分离度、塔板数、进料位置对透热精馏节能效果的影响;(5)以全塔总有效能损失为比较基准,对热量在塔内的三种分布方案即热负荷平均分配法、经验法和分离度匹配法进行了对比分析并得出结论:塔内热量的不同分布方案对于全塔总有效能损失会产生影响,其中以分离度匹配法的节能效果最为理想,为减少有效能的损失,应使塔内的热量分布满足各塔板的分离度要求,并在此前提下,尽量减小有效能损失大的塔板的热负荷和增加有效能损失小的塔板的热负荷。
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For this method, integeral was proceed by triangular Gaussian quadrature method in polygon domain, which can reduce computational time greatly. Neighbor nodes database was create which can reduce neighbor nodes searching time. Rock and soil cutting problem are two complicated problems, so a robust method is needed to treat essential boundary condition.
岩土掘削数值分析要求无网格法拥有高效而适应性强(来源:ABC论文f1网www.abclunwen.com)的本质边界条件处理方法,本文提出一种新的处理方法,该方法通过改变边界节点权函数使试函数通过边界节点,并采用对角元素改1法满足本质边界条件,该方法灵活性强,适用于各种岩土掘削问题。
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Esthesia devices enable all points of the training assembly to meet given conditions, and achieve separation through searching a series of weights.
感知器通过寻找一系列权使训练集合中的所有点都满足规定的条件来实现分隔。
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It is shown that the error can be up to 6.6 nm when the original distance between inner face of the etalon plate and the adjacent silicon sphere surface equals 13.2 mm, and the incident angle equals 10^(-3) rad.
提出了一种精确调整光束垂直入射平板的方法,实验结果表明,此方法能够使光束入射角的调整优于10^(-5)rad,满足系统测量的要求。
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The combined scheme of selective hydrogenation and etherization of FCC's light gasoline and hydrogenation desulfurization of heavy gasoline can make gasoline quality meet EURO IV Standard, indicating that this combined scheme is a feasible scheme selection for gasoline quality updating and upgrading.
FCC汽油实施加氢、醚化及重汽油加氢脱硫组合方案后,可使该汽油质量满足欧IV标准,说明该组合方案是实现汽油产品升级换代的一种可行的方案选择。
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A variable-step modified Euler time integration method is proposed and analyzed. Four major factors that affect the efficiency of the variable-step modified Euler time integration method are discussed. These include stability and accuracy analysis for the damped fix-step modified Euler integration formula, adjustment method of the fix-step basic integration formula to accommodate step-size changes, suitable range of the step-size selection strategy based on truncation error concept and development of the step-size selection strategy based on apparent frequency concept to satisfied the specified error bound and stability condition.
提出了变步长修正Euler时间积分法,详细讨论了影响变步长修正Euler时间积分算法效率的四个主要因素,它们包括:有阻尼问题的修正Euler法的稳定性和精度分析,调整固定步长的基本积分公式使之容纳步长大小变化的研究,基于截断误差概念的步长大小选择策略适用范围的讨论,同时满足规定误差界和稳定性条件的、基于表观频率概念的步长大小选择策略的建立。
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The wall must be designed so that the individual pieces of the wall do not pullout, separate, or slide apart. In a modular block wall, the designer must be concerned with the potential of the tieback failing under tension or pulling out from the soil or the facia.
墙的设计必须使个别墙不分离,独立或外移,墙的一个独立单元,设计必须满足来自墙体和面板的压力和推力引起的潜在破坏联结面的要求。
- 推荐网络例句
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I will endeavour to find you some assistance.
我尽力帮你找人帮忙。
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At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.
起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。
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Ah may dee:You are chinese living in a democratic country.
你是居住在民主国家的中国人吧。