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为降低纸浆间歇蒸煮过程的能耗,提出了一种基于支持向量机(SVM)和遗传算法的蒸煮参数优化方法。该方法先根据生产数据,采用SVM建立了间歇蒸煮纸浆卡伯值模型,描述了白液浓度、硫化度、白液量、黑液量、蒸煮时间和蒸煮温度等参数与纸浆卡伯值之间的数学关系;再针对基于SVM的纸浆卡伯值模型较难用于常规优化方法的问题,提出了一种改进的自适应小生境遗传算法,用于间歇蒸煮的参数优化,使纸浆满足质量要求的前提下尽量降低蒸煮过程能耗;最后进行仿真,与实际生产数据相比,实验结果节约蒸汽3.52%,节约白液用量17.18%,硫化度减少0.37%。实验结果表明,该方法模型泛化性好,优化效果明显,很大程度上实现了节能降耗。 相似文献
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为了实现细纱生产工艺参数优化,解决细纱生产过程中高能耗问题,提出了一种基于非支配排序遗传算法的细纱工艺参数多目标优化方法.通过分析细纱生产工艺流程,确定了影响细纱成纱质量与能耗的工艺参数,提取了评价成纱质量的关键质量评价指标,结合灰色关联理论将质量评价指标转化为综合质量指标,利用二阶响应曲面法拟合工艺参数与综合质量指标... 相似文献
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基于遗传算法的圆形振动筛减振弹簧的优化设计 总被引:1,自引:0,他引:1
在圆形振动筛减振弹簧的优化设计中,传统的优化方法存在着求解过程复杂和寻优过程容易陷入局部最优解的问题。本文采用遗传算法将生物进化原理和最优化技术结合,使求解无需确定性规律,多目标优化的寻优过程简化,确保了大概率获得全局最优解,应用效果明显。 相似文献
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针对传统多目标算法在应用中解决多目标优化问题时存在的Pareto前沿收敛不好、解集均匀性差等问题,文章通过实例对BBO算法进行研究和综合分析,将其与传统经典多目标算法相互结合来求解多目标优化的问题.首先,将其与NS-GA-Ⅱ算法相结合提出一种混合多目标BBO优化算法;然后,改进BBO的迁移算子应用于群体的进化,增强了种群的多样性;最后,提出一种改进的变异算子,防止种群陷入局部收敛.将提出的基于生物地理学的多目标优化算法(MOBBO),通过标准函数测试和经典的进化的多目标优化算法进行比较,结果表明该算法所得的Pareto最优解集能够逼近真正的Pareto前沿,具有一定的竞争性. 相似文献
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采用热力学夹点技术对间歇蒸煮过程的系统用能状况进行分析,比较了传统间歇蒸煮过程和RDH过程的用能,同时提出了使常规间歇蒸煮降低能耗的新方案。 相似文献
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应用改进遗传算法的自动配棉模型优化与应用 总被引:1,自引:0,他引:1
针对配棉工艺具有多约束条件的特点和现有自动配棉的不足,提出将改进的遗传算法应用到线性规划优化求解问题中,通过改进遗传算法的初始种群生成策略、遗传算子和进化收敛条件,将配棉约束条件动态融合到种群进化过程中,在保证配棉约束条件的前提下,兼顾了求解的效率和有效性,以达到对自动配棉进行优化的目的。应用结果显示:用改进遗传算法对配棉模型的求解优于基本遗传算法,且配棉的各项指标值符合生产技术要求,在满足混棉质量的前提下,该方法能指导技术人员对候选棉和库存棉做出更合理的选择,有效降低了配棉成本。 相似文献
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通过运用可靠性设计理论及优化设计理论,建立了浆池循环泵V带可靠性优化设计的数学模型。以V带传动依概率不发生疲劳断裂和打滑为主要可靠性约束条件,带传动的体积最小为优化目标,利用遗传算法进行优化求解。设计结果显示它不仅使V带有较高的可靠性而且体积有较大减小。 相似文献
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Hannu Ramark 《中国造纸》2013,32(1):56-58
溶解浆的生产过去以亚硫酸盐法蒸煮为主,由于环境的原因,亚硫酸盐法蒸煮已较少采用,而采用预水解硫酸盐法蒸煮.开始只采用间歇蒸煮技术,但由于溶解浆的需求不断增加,开发了基于预水解硫酸盐法蒸煮的连续蒸煮技术.这一新的解决方案已经通过广泛的实验室实验,随后在最初设计生产漂白硫酸盐商品浆的浆厂应用.新设计的工艺和设备已经解决了先前尝试在溶解浆生产中采用连续蒸煮技术遇到的负面问题.新建和现有的浆厂可以从该新工艺解决方案中受益,这也使得溶解浆与造纸用浆可共用同一制浆生产线. 相似文献
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The complex method, a general and flexible optimization algorithm, was used to determine the optimum process temperature profiles during thermal processing to maximize (optimize) the objective function of volume average retention of thiamine in conduction heated foods with restrictive explicit and implicit constraints. Implicit constraints were the target lethality at the coldest point, and a threshold below which the center temperature must reach at the end of the process. A process temperature range of 5–150C was used as an explicit constraint. Another explicit constraint was that the process temperature had to reach 5C at the end of the process. Control variable for the optimization was process temperature profile discretized at equidistant time steps throughout the process. All calculations were performed using a computer program written in Microsoft Visual Basic V. 6.0. This Windows‐based software calculated the optimum temperature profiles with resulting objective functions and implicit constraints. The developed algorithm for the Complex Method was found to be satisfactorily usable for the optimization of thermal processing of conduction heated foods. 相似文献
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7封闭循环 前面讨论的工艺技术是漂白硫酸盐浆厂封闭循环的基础,通过内部循环,漂白用水和废水排放大大减少。漂白浆厂的全封闭水循环目前还没有实现,部分循环使得水的用量由原来的66m^3/t(风干浆)降为6~8m^3/t(风干浆),减少了90%。 相似文献
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The goal in a multi‐objective function optimization problem is to optimize the several objective functions simultaneously. the complex method is a powerful algorithm to find the optimum of a general nonlinear function within a constrained region. the objective of this study was to apply the complex method to two different shapes (a sphere and a finite cylinder) subjected to the same thermal processing boundary conditions to find a variable process temperature profile (decision variable) to maximize the volume‐average retention of thiamine. A process temperature range of 5 to 150C was used as an explicit constraint. Implicit constraints were center temperature and accumulated center lethality of the sphere and the finite cylinder. the objective functions for both shapes were combined into a single one using a weighting method. Then, the previously developed complex algorithm was applied using Lexicographic Ordering to order the objective functions with respect to their significance. the results were reported as optimum variable process temperature profiles using the given geometries and objective functions. the thiamine retentions were also compared with a constant process temperature process, and 3.0% increase was obtained in the combined objective function. the results showed that the complex method can be successfully used to predict the optimum variable process temperature profiles in multi‐criteria thermal processing problems. 相似文献
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真空-压力浸溃蒸煮工艺及其设备的研究 总被引:1,自引:0,他引:1
以2年生中林杨-46为原料,通过实验分析了真空-压力浸渍蒸煮的影响因素,并将实验结果与传统蒸煮工艺进行比较.按照工艺要求,设计了真空-压力浸渍蒸煮新型设备,着重介绍了该设备的结构组成、工作原理和主要特征部件.将真空技术引入传统蒸煮工艺,可以改善纸浆性能、提高生产效率、降低碱回收成本. 相似文献