共查询到19条相似文献,搜索用时 234 毫秒
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本文针对陶瓷烧成窑炉具有大滞后、非线性、不确定性等特点,提出一种基于小波基函数的陶瓷烧成温度的预测函数控制方法。给出陶瓷烧成温度预测函数控制的基本原理;利用小波的多尺度分析和紧支局部特性,选取小波函数作为基函数,根据逼近要求灵活设置小波基函数的个数及位置分布,在保证系统整体优化性能的同时又兼顾了局部重点要求;理论分析和仿真表明,该控制方法与普通PFC方法相比,在动态特性、控制精度、抗干扰等方面具有明显的改善作用。 相似文献
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针对陶瓷烧成生产过程的复杂性,提出一种陶瓷烧成温度预测函数控制方法。首先分析跟踪设定温度的陶瓷烧成温度预测函数控制方法的控制量结构,并给出预测函数控制方案;然后进行闭环系统性能分析;最后对模型进行仿真。 相似文献
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陶瓷生产中的温度参数及温度控制 总被引:1,自引:0,他引:1
“原料是基础,成型是条件,烧成是关键”,在陶瓷的发展中,烧成一直是至关重要的。其实,烧成,狭义地说是温度的控制。从远古的肉眼看火,至当代的热电偶、热电阻、光学高温计等先进测量设备测量,都是了解烧成过程中的温度参数。陶瓷生产,特别是现代的广义陶瓷生产(建筑卫生陶瓷、艺术陶瓷、日用陶瓷、特种陶瓷等),由于它们各自的特殊工艺性能要求对温度的要求更为严格,所以对陶瓷生产中的理论温度、实际温度等温度参数进行一番深入了解是非常有意义的。在此主要从建筑陶瓷角度出发去剖析陶瓷生产中的温度参数及温度控制。1温度参数1… 相似文献
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以红柱石颗粒为主要骨料,辅以莫来石颗粒和刚玉颗粒,硅微粉、铝微粉为基质料,经混合、困料及成型后,经不同温度下烧成4h,制得莫来石基刚玉-莫来石复相陶瓷,分析了烧成温度对复相陶瓷的物相组成、显微结构、烧成性能、力学性能及热学性能。结果表明:红柱石在高温下转化成针状和柱状莫来石改善复相陶瓷的烧成性能和抗热震性能;在1480℃烧成时,红柱石刚玉-莫来石复相陶瓷具有优越性能,其抗折强度为15.4MPa,耐压强度为91.6MPa,热膨胀系数为5.5×10-6/K,1100℃下水冷的抗热震次数达到99次。 相似文献
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本文提出了分析计算降低陶瓷烧成温度与节能间关系的一种简易方法,并通过实例分析了降低陶瓷烧成温度的节能裕度;指出,降低烧成温度,缩短烧成时间,提高产品产量,才能大幅度地降低单位陶瓷烧成能耗,提高窑炉的热效率. 相似文献
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本文以丰富的实验数据说明烧成温度,低融物性质和数量,成型压力,粒度和级配,坯料组成和烧成条件等对陶瓷低温烧成的影响.分析了陶瓷低温烧成中关键性的控制因子. 相似文献
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关于BaTiO_3基半导体陶瓷的烧成工艺敏感性问题 总被引:1,自引:0,他引:1
一、引言 BaTiO_3基半导体陶瓷的研制实践表明,这类陶瓷材料的组成和烧成条件对其电阻率及电阻温度系数等性能指标影响非常敏感。在BaTiO_3基半导体陶瓷的生产中常常出现的产品性能指标分散性大、再现性差的问题,往往都与这类材料的组成敏感性和工艺敏感性密切相关。关于组成敏感性的问题我们已通过掺杂对BaTiO_3陶瓷半导化的影响机理问题的讨论作了阐明,这里拟介绍有关烧成条件对BaTiO_3半导体陶瓷电阻率 相似文献
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A sol-gel method for preparing selective layers of ceramic ultrafiltration membranes based on titania hydrosols is considered. The characteristics of the pore structures of the selective layers are considered as a function of the initial composition and the firing temperature. All of the selective layers have a narrow range of the pore size distribution and meet the requirements imposed on ultrafiltration membranes. 相似文献
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在陶瓷产品生产过程中,不同烧制阶段陶瓷梭式窑烧结带温度发生相应的变化,其对应的火焰图像也随着变化。本文针对陶瓷梭式窑烧结带温度检测提出一种基于改进BP神经网络的火焰图像识别方法。首先对获取的火焰图像利用改进的小波阈值算法去除图像中的噪音进行预处理,其次基于改进的BP神经网络对得到的火焰图像三个分量值R、G、B和测得的火焰温度进行数据拟合,最后测试已训练的神经网络识别火焰图像的效果。实验结果表明,改进后的BP神经网络收敛速度更快、训练时间更短、误差更小,能够更好地检测陶瓷梭式窑火焰图像温度。 相似文献
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The possibility of achieving optimum conditions of heat treatment of ceramic articles in furnaces with radiating walls is shown. A function providing control of the thermal energy supply to the firing zone of the furnace is found for the considered example of solid brick firing in the furnace, which makes it possible to obtain high-quality articles at minimum intensity of heat transfer and minimum power consumption. 相似文献
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陶瓷辊道窑辊棒两端散热过程的数值模拟 总被引:1,自引:0,他引:1
本文采用误差分方法对陶瓷辊道窑辊子的温度分布和通过辊子两端散热的过程进行了数值模拟与分析,并结合本文提出了用余弦函数近似描述窑内制品烧成的曲线的方法计算了全窑辊子的散热损失,所得计算结果对深入了解辊道窑的热工过程,辊子的热负荷状态及指导生产实际有一定的参考意义。 相似文献
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L. A. Mekler 《Journal of the American Ceramic Society》1926,9(6):281-286
The most common types of fuel burning equipment and the usual methods of their installation, originally developed and perfected for power plant use, are not suitable for the ceramic industory and result in excessive costs and difficulties in operation and control. When fuel oil is considered not a substitute for coal but an independent fuel with characteristics somewhat radically different from those of coal, and the kiln construction together with method of firing is changed to meet these characteristics, oil firing proves superior to coal firing in nine cases out of ten. 相似文献
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I. C. Franco J. E. Schmitz T. V. Costa A. M. F. Fileti 《Chemical Engineering Communications》2017,204(1):39-54
Refrigeration systems exist in different branches of industry and are characterized as great energy consumers with considerable nonlinear behavior. Several studies have promoted energy costs reduction and minimization of nonlinearities effects in such systems. Model predictive control has been successfully used to stabilize processes in the presence of such nonlinearities; therefore, its application in refrigeration systems is considered promising. In the present study, Takagi–Sugeno models were developed and validated in order to predict the evaporating and secondary fluid temperatures (TE and TP) based on the ANFIS technique (Adaptive Network-based Fuzzy Inference Systems) for a vapor-compressor chiller equipment. The prediction performance of resulting models was analyzed and accessed based on the variance accounted for criteria. These models were then used as the basis for prediction models in several generalized predictive controllers (GPC) denoted here as GPC-ANFIS controllers. Different predictive controllers were designed for different local rules (Fuzzy rules) and the global control action was assumed as the weighted sum of local controllers. Experimental tests considered two distinct controllers, namely the GPC-ANFISTE (evaporating temperature control by means of compressor speed variation) and GPC-ANFISTP (propylene glycol temperature control by means of compressor speed variation), were performed. The experimental tests for setpoint tracking (±1°C) considering 3000 W of constant heat load showed satisfactory results with setpoint deviation around ±0.3°C. Therefore, the ANFIS technique demonstrated to be able to provide reliable predictive models to be used in generalized predictive control algorithms. 相似文献
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S. A. Karaush 《Glass and Ceramics》1998,55(5-6):135-137
Three groups of criteria of temperature control in firing of ceramic articles are considered. An assessment of the effect
of the main control criteria on the firing process is provided for a furnace with radiating walls.
Translated from Steklo i Keramika, No. 5, pp. 3 – 5, May, 1998. 相似文献