共查询到17条相似文献,搜索用时 781 毫秒
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为在过程早期获取HSE综合性质优良的反应路径,提出了基于模糊HSE评价的多目标反应路径综合方法。全面考虑HSE因素,形成了HSE指标结构,通过设定指标的隶属度函数,建立模糊推理系统,应用层次分析法(analytic hierarchy process,AHP)确定指标的权重因子,形成了模糊HSE评价方法。基于模糊HSE评价体系,建立以安全、环境和健康为目标函数的多目标优化模型,求解得到优良的反应路径组合。应用于萘甲胺反应路径综合实例,定量得到了反应路径及其HSE目标函数值,为过程早期的路径优选提供定量数据。 相似文献
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反应路径综合是过程综合的核心,对减小过程的环境影响、提高过程安全性等起到关键作用。本文介绍了已有反应路径综合方法,并着重阐述了考虑环境因素和安全因素的综合方法的研究进展,重点阐明了这些方法的实现手段以及实例应用情况,分析了它们的优点和不足。对几种具有代表性的反应路径综合方法的特色以及存在的问题进行了评价,得到反应路径综合研究的重点主要有以下3方面:基于反应路径综合的成熟方法,寻求集成本质安全的策略方法将有利于实现反应路径的本质安全;应用多目标优化方法获取反应路径综合的多目标最优解是重要的研究方向之一;着眼于全局过程系统,注重环境影响最小化的反应路径综合的实现和应用研究具有重要现实意义。 相似文献
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通过对企业经济效益影响因素的综合分析,确定了综合评价的层次结构,建立了模糊多层次综合评价方法。该方法通过模糊合成运算,将复杂的企业综合经济效益综合评价问题转化为定量指标,从而能更科学地评价企业的经济效益状况。 相似文献
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通过对企业效益影响因素的综合分析,确定了综合评价的层次结构,建立了模糊多层次综合评价方法。该方法通过模糊合成运算,将复杂的企业综合经济效益综合评价问题转化为定量指标,从而能更科学地评价企业的经济效益状况。 相似文献
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综合质量交换网络时,评价指标往往不止一个,多个指标相互之间往往又是无法比较、相互矛盾的,甚至有的指标只是定性的,无法定量地表示。故尝试应用模糊数字对多目标进行评价,有效地模拟了多目标决策的过程,过程中规则的变换可反应决策者对不同目标的重要性取向。此外还提出了多目标模糊评价遗传算法(MOGAFR)求解多目标优化问题。数例的求解证明了该法可能得到非劣解集合,并可以对非劣解集中的个体区分出优劣,规则不同,可以收敛到非劣解集合的不同部分,多目标质量产换网络的综合证明其解决工程问题的有效性,所提出的方法适用于求解其他系统的多目标优化问题。 相似文献
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Control of pH processes is very difficult due to nonlinear dynamics, high sensitivity at the neutral point, and changes in the concentrations of known or unknown chemical species. In this study, a dynamic fuzzy adaptive controller (DFAC) with a new inference mechanism is proposed and applied for the control of pH processes. The DFAC consists of a low-level basic control phase with a minimum rule base and a high-level dynamic learining phase with an updating mechanism to interact and modify the control rule base. The DFAC can self-adjust its fuzzy control rules using information from the process during on-line control and create new fuzzy control rules or modify the present control rules using its learning capability from past control trends. The controller is evaluated by applying it to a weak acid-strong base pH process with input disturbances and to another pH process that involve that has changes in acidic/buffering streams. The results of the DFAC with the new inference mechanism are compared with the known inference mechanisms, the fuzzy controller, the conventional PI controller, and also with an adaptive PID controller. The proposed DFAC provides better performance for set point tracking of the pH and rejection of load disturbances and buffering affects. 相似文献
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Bulk tobacco flue-curing process significantly affects the quality and fragrance of cured tobacco leaves. The control of bulk tobacco flue-curing process is therefore quite important for tobacco industry. In this work, a neuro-fuzzy-based method for controlling bulk tobacco flue-curing process was proposed. In particular, an adaptive network-based fuzzy inference system (ANFIS) was developed to predict the set point changing time. To illustrate the applicability and capability of the ANFIS model, the proposed approach was tested with a bulk tobacco flue-curing barn database, which included totally 574 data sets obtained in the four curing cycles. The results demonstrated that the proposed approach could be applied successfully and provide high accuracy and reliability for bulk curing barns. Furthermore, to analyze how input factors affect the bulk tobacco flue-curing control process, the selection of input linguistic factors was also discussed. The factors of color and curing phase were found to have the most substantial influence on curing control process. A comparative study among the proposed neuro-fuzzy approach and other related methods was also performed. Both the statistical measures and visual assessment illustrated that the proposed ANFIS method outperformed the other methods in this study, which further showed the effectiveness and reliability of the neuro-fuzzy approach to bulk tobacco flue-curing control process. 相似文献
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为有效处理多变量、非线性及非最小相位系统的复杂化工过程,提出了一种新型的自适应模糊滑模控制,该方法针对滑模控制鲁棒性好但存在抖振的问题,采用模糊控制柔化控制信号,而与滑模控制的结合可以充分利用系统信息,简化模糊控制;在此基础上提出一种新的自适应调整比例因子来进行模糊变论域,柔化了控制信号并减小了滑模控制器输出的抖振。并给出模糊滑模控制的算法和稳定性分析,得到简化后的通用模糊规则库,可通过比例因子在线调节输入量的论域,使构成的控制系统具有很强的鲁棒性、较好的自适应能力和较高的控制精度。最后对于非线性单输入单输出(SISO)和多输入多输出(MIMO)化工模型进行仿真研究,结果表明即使工况点发生大的变化或受到较大干扰时,仍具有良好的抗扰动能力和很强的鲁棒性。 相似文献
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Symbolic representation and sequential processing of information in most expert systems have made it difficult to represent continuous variables and to model interactions among different parts of a large process system. This paper proposes a new approach, principally aimed at function oriented engineering design problems. Continuous variables and qualitative information are treated as fuzzy sets. A fuzzy match inference strategy is proposed to assess design schemes with rules in parallel. The fuzzy match inference strategy is then extended to multi-step decision making in the synthesis of multicomponent separation sequences. The new concepts have been implemented in a prototype expert system, where the selection of separation technologies and sequencing of separators are approached in an integrated manner. It is shown from several examples that the inference strategy yields promising results in quantitative evaluation of process synthesis and combinatorial optimization. 相似文献
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Two two-level decomposition methods for complex chemical engineering system optimization have been developed. In the first one input and output block variables are fixed. Two variations of this method are proposed: the variation with complete and that with incomplete decomposition. In the second method the block variable interrelations are transfered into the objective function. 相似文献