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本文通过了解化工工艺设计的理论,总结了化工工艺设计的分类,化工工艺设计的特点,以及化工设计的计算,结合多年的工作实践和经验做了阐述,同时也对未来化工工艺设计的趋势做了探讨。 相似文献
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化工工艺是依据化学过程以及化学反应来设计的,是整个化工工艺设计的核心,重视化工工艺设计,有助于在生产过程中保障人员和器械的安全,减少由于安全问题造成的损失。本文首先分析了化工工艺设计的现状,然后从四大方面详细探讨了化工工艺设计的要点。 相似文献
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分析了当前机械制造企业在工艺设计及管理中存在的一些典型问题,提出了相应的解决措施,研制了一种集成化工艺设计及管理系统LGTIM-CAPP。该系统能与编码系统、产品数据管理(PDM)系统相结合,实现设计、工艺与制造信息的集成与共享。 相似文献
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对我国自行研制的新型高弹性合金3YC42的不同工艺状态的组织进行了透射电镜研究,为合金设计与加工工艺的优化提供了理论与实验基础,证实了保证航天工程用特殊弹簧部件全面服役性能质量的材料设计方法的成功。 相似文献
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化工设备图形符号标准化的探讨王小玲(武汉纺织工学院)一、化工设备图形符号使用现状在化工过程开发、化工工艺设计以及化工工艺等学科的教学、科研中,都不可避免地要绘制或阅读生产工艺流程图。这是一种以图解方式表达原料如何依次通过各种化工过程和设备从而转变为产... 相似文献
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朱葛中 《中国新技术新产品》2012,(9):140
本文通过了解化工工艺设计的理论并结合实际,针对化工工艺设计中的常见问题,如:管道设计压力和设计温度的确定;管径选择;管道材料选择;阻火器的设置等,提出一些建议。 相似文献
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以轮轨表面粗糙度为激励,利用车辆-轨道多刚体耦合振动模型计算轮轨作用力.利用有限元理论建立轮对的有限元分析模型,以轮轨作用力为激励进行轮对的振动频响分析.以振动响应分析结果作为边界条件,利用边界元理论建立轮对边界元声学分析模型,对轮对振动声学特性进行了计算分析.其结果与公认的模型和软件的计算结果相比具有较好的一致性,证明本文做法的正确性. 相似文献
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将主成分分析(Principal Component Analysis,PCA)用于信号处理,并与奇异值分解(Singular Value Decomposition,SVD)方法比较。分析总结PCA及SVD信号处理原理,提出基于PCA的特征值差分谱理论用于信号消噪。结果表明,PCA与SVD的处理效果较相似,相似性原因为原始矩阵右奇异向量即为协方差矩阵特征向量。SVD较PCA的重构误差小,因SVD无需计算协方差矩阵,可避免舍入误差产生。 相似文献
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聚苯乙炔的电性能研究 总被引:5,自引:0,他引:5
用四种掺杂剂,I_2、Br_2、BF_3·乙醚和发烟H_2SO_4,作了聚苯乙炔(PPA)的掺杂。对掺杂及未掺杂的PPA做了电导率测定。实验表明,发烟H_2SO_4掺杂效果较好(电导率提高10~7倍),I_2较差。对不同分子量和不同密度的PPA的电导率测定表明;PPA分子量越高,电导率越高;PPA密度越大,电导率越高,并且PPA分子量越大,掺杂后电导率提高的幅度也越大。本文还讨论了掺杂机理和无水AlCl_3在苯乙炔聚合过程中的同步掺杂作用。 相似文献
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氰乙基纤维素的研制及探讨 总被引:4,自引:0,他引:4
氰乙基纤维素是较早开发和研制的纤维素醚类,因它具有高电介层独特的性质,应用在许多特定的场合和材料中,但生产CEC的工艺较复杂,并且得不到较高取代度的CEC,本工艺对老工艺进行改进,减少副反应,使氰乙基化反应较完善,得到高质量的氰乙基纤维素。 相似文献
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P. Thirumurugan P. Shanthakumar 《International journal of imaging systems and technology》2016,26(2):157-162
In this article, the segmented brain tumor region is diagnosed into mild, moderate, and severe case based on the presence of tumor cells in the brain components such as Gray Matter (GM), White Matter (WM), and cerebrospinal fluid (CSF). The modified spatial fuzzy c mean algorithm is used to segment brain tissues. The feature Local binary pattern is extracted from segmented tissues, which is trained and classified by ANFIS Classifier. The performance of the proposed brain tissues segmentation system is analyzed in terms of sensitivity, specificity, and accuracy with respect to manually segmented ground truth images. The severity of brain tumor is diagnosed into mild case if the segmented brain tumor is present in the grey matter. The severity of brain tumor is diagnosed into moderate case if the segmented brain tumor is present in the WM. The severity of brain tumor is diagnosed into severe case if the segmented brain tumor is present in the CSF region. The immediate surgery is required for severe case and medical treatment is preferred for mild and moderate case. 相似文献
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G. Wang W. Li L. Xue L. Kou X. Zhu Y. Xu 《Materialwissenschaft und Werkstofftechnik》2020,51(10):1423-1441
The effect of cut-outs positions and shapes on deformation behaviors and energy absorption of automobile thin-walled structures is researched by quasi-static axial compression, using MTS machine and digital image correlation method. The accuracy of finite element modeling is verified by axial compression test. The relationship between variation characteristics of different time and sections and deformation of the sample is analyzed. The results show that the number of surface deformation concentrated areas is affected by position of circular cut-outs. Peak load of sample could be effectively reduced by slotted-shaped cut-outs. The energy absorption of slotted-shaped cut-outs with different aspect ratios and directions is different, horizontally-long-slotted cut-outs is increased by 5.13 %. The position of deformation concentration region is affected by compression half-wavelength. Deformation concentration region of sample less than half-wavelength is below cut-outs. By digital image correlation method, strain of horizontally-long-slotted cut-outs is more concentrated. Peak load is effectively reduced. The results of finite element analysis show that when the thin-walled structure is bulking, the section of sample is deformed from top to bottom. The initial area of cross-section at center of cut-outs is linear with peak load. These achievements may serve as guideline for enhancing compression performance of thin-walled structures. 相似文献