共查询到11条相似文献,搜索用时 151 毫秒
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通过对沉降槽上应用过的几种液位计的测量原理及使用情况分析,说明了吹气式液位计和超声波液位计测量的缺陷及采用雷达液位计的必要性,并指出:雷达液位计是今后物位测量的发展方向。 相似文献
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王兵 《计算机测量与控制》2017,25(6):52-52
近年来,随着我国互联网云计算的不断发展,云计算技术被应用于诸多领域。针对传统石油化工领域中储罐液仪表存在的罐内压力检测精准度差、温度感应灵敏度低与储罐液状态数据分析面窄等问题,提出云计算下石油化工罐区储罐液仪表设计。通过大数据运算核心进行框架构建,在此基础上,采用PCJD气流密度差算法、微感热源运算单元与数据流云算技术,对传统储罐液仪表进行设计改进,从问题的根源进行针对性解决。仿真对比试验证明,提出的云计算下石油化工罐区储罐液仪表设计,具有罐内液压力数据反馈精准度高,温度感应灵敏度高、储罐液综合数据分析速度快、数据分析完整度高等优点。 相似文献
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尝试一种进行化工过程仿真的新方法,利用Matlab的仿真工具箱Sireulink,对全混流反应器进行可视化建模和仿真计算,以一个一级不可逆放热反应为例,进行稳态模拟及动态模拟,根据模拟结果提出反应器最优操作状态,并对动态模拟的各稳态操作点进行详细分析,同时提出了避免不稳定性的方法。结果表明,使用Simulink所建立的模型,具有很好的开放性和可移植性,还能轻松地分析过程动态特性,是进行建模仿真的好工具。 相似文献
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To achieve improvements in the production capacity and energy efficiency of an industrial tubular ball mill, an Improved adaptive Evidence-Theoretic k-NN rule was proposed, and was applied to monitor an unmeasured parameter, i.e., level of coal powder filling in ball mill.The improved adaptive rule was realized by means of two strategies: (1) a parametric distance metric was applied instead of Euclidean distance metric, and (2) some structure parameters fixed in the original adaptive rule, as well as the parameters brought in by the parametric distance metric, were optimized based on gradient descent algorithm. Some popular data sets were used to validate the performance of the improved adaptive rule. Consequently, the improved adaptive rule was applied to monitor the level of coal powder filling in ball mill. To demonstrate the validation of the improved adaptive rule for this task, some experiments were conducted on an industrial tubular ball mill. The experimental results suggest that the improved adaptive rule was applicable for monitoring the unmeasured parameter in industry. 相似文献
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针对蒸气压缩式制冷循环的特点,提出了制冷参数测量仪的设计方案。通过测量制冷系统的蒸发温度、蒸发压力、冷凝温度、冷凝压力这四个参数,并结合饱和蒸汽表或压焓图、热力学基本性质和马丁-侯方程,可获得制冷系统性能参数和热力学参数;为满足高精度的参数测量,设计了可靠的恒流源电路;为解决压力传感器的温度漂移设计了二元曲线拟合的方法,补偿后的最大相对误差为0.53%。仪表具有制冷、制热、自动、真空度、气密性多种测量模式,可通过USB与上位机通讯,可用于空调、冰箱等单工质制冷系统测量,支持30余种冷媒。该仪表的研制填补了国内制冷领域专业数字式测量仪表的空白。 相似文献
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张晓杰 《自动化与仪器仪表》2008,(1):60-62
介绍了几种最新的测量仪器控制系统总线技术,分析了其主要性能、特点以及给测量仪器和控制系统带来的影响,探讨了GPIB与其它总线组合使用时仪器系统的未来发展. 相似文献
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《Pattern recognition》2006,39(5):812-826
A feature selection methodology based on a novel Bhattacharyya space is presented and illustrated with a texture segmentation problem. The Bhattacharyya space is constructed from the Bhattacharyya distances of different measurements extracted with sub-band filters from training samples. The marginal distributions of the Bhattacharyya space present a sequence of the most discriminant sub-bands that can be used as a path for a wrapper algorithm. When this feature selection is used with a multiresolution classification algorithm on a standard set of texture mosaics, it produces the lowest misclassification errors reported. 相似文献
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虚拟仪器技术正在成为测试测量与控制领域的重要应用工具。介绍了虚拟仪器的概念、特点、结构及开发工具,通过开发的光合作用测定系统的应用实例,说明虚拟仪器技术在植物生理生态仪器研究领域有着广阔的应用前景。 相似文献