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对由铂/锌原电池构成的对酸雨敏感的大气腐蚀监测器,在人造酸雨溶液中的行为进行了研究,人造酸雨溶液为H2SO4:HNO3=2:1配制而成,在不同的通气条件下,对铂和锌材在酸雨溶液中的阴极和阳极极化行为进行了测试。 相似文献
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对钢铁生产中多目标调优的不良结构问题,试采用交互模式识别的非线性映照信息处理技术,寻找优化目标的类别属性与影响因素值间的对应关系,从而解析优类样本的共性。此方法应用于高炉多项经济、技术指标优化的探索,由计算结果知:入炉品位是影响高炉经济、技术指标的最重要因素,而提高烧结矿品位是提高武钢入炉品位的最佳方法。应用于生产后,已收到显著效果。 相似文献
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对钢铁生产中多目标调优的不良结构问题,采用交互模式识别的最优判别平面信息处理技术,以分割高维空间的方法,探求优化目标的类别属性与影响因素值的对应关系,从而实现了模式的分类识别和优化控制,将此方法用于管线钢多项力学性能的优化,使其综合性能得到提高,满足了管线钢的高性能要求。 相似文献
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The hydraulic roll-bending device was studied, which was widely used in modern cold rolling mills to regulate the strip flatness.
The loaded roll gap crown mathematic model and the strip crown mathematic model of the reversing cold rolling process were
established, and the deformation model of roll stack system of the 6-high 1 250 mm high crown (HC) reversing cold rolling
mill was built by slit beam method. The simulation results show that, the quadratic component of strip crown decreases nearly
linearly with the increase of the work roll bending force, when the shifting value of intermediate roll is determined by the
rolling process. From the first pass to the fifth pass of reversing rolling process, the crown controllability of bending
force is gradually weakened. Base on analyzing the relationship among the main factors associated with roll-bending force
in reversing multi-pass rolling, such as strip width and rolling force, a preset mathematic model of bending force is developed
by genetic algorithm. The simulation data demonstrate that the relative deviation of flatness criterions in each rolling pass
is improved significantly and the mean relative deviation of all five passes is decreased from 25.1% to 1.7%. The model can
keep good shape in multi-pass reversing cold rolling process with the high prediction accuracy and can be used to guide the
production process. 相似文献
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对Q235钢屈服强度、抗拉强度和伸长率的合格率状况进行统计。在此基础上,用板坯的碳含量科学地规划其轧制厚度的方法,从而保证Q235钢性能基本全合格;通过建立数学模型的方法,对Q235钢力学性能进行预报。 相似文献
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针对支持向量机参数难以选择的问题,提出了基于差分进化算法(DE)的参数选择方法,算例分析结果表明DE算法选择SVM参数有着迭代次数少、结果稳定的优点,能够很好的解决SVM的参数选择问题。随后将基于DE算法选择参数的支持向量机应用于一个钢材质量管理的建模实例中,并将其与神经网络建模方式所得结果相比较,结果表明经改进的支持向量机的预测性能更加优秀。 相似文献