基于LS-SVM棉针织物前处理工艺指标软测量

该文针对棉针织物前处理过程工艺指标吸水性和白度难以实现在线连续检测,且与前处理过程温度、时间、液碱浓度、双氧水浓度等影响因素具有较强非线性,难以建立精确数学模型。在分析了棉针织物前处理过程质量指标相关影响因素的基础上,采用最小二乘支持向量机建立了前处理过程工艺技术指标软测量模型,并通过实验验证了软测量模型的有效性。     

基于FPGA的光栅尺位置速度反馈模块设计

利用FPGA的高速运算能力,建立一个数据采集处理模块,该模块的任务是采集光栅尺输入信号,对采集到的信号进行分析处理,得出速度、位移、方向等物理量.并对该模块进行了仿真,结果表明模块可以很好地完成预定任务.     

部分信息下的最优投资选择模型研究

在部分信息下研究了均值方差投资选择模型.投资者只能观察到风险资产的价格,漂移过程用一个高斯过程来刻画.本文的目的是使最终财富期望最大化,而使得最终财富的方差最小.本文模型中有一个债券及股票资产,在部分信息下推导出了最优策略及均值方差有效前沿.     

混合装配线过程平衡研究与仿真

生产过程的混合装配线平衡问题,分为在确定条件下的最小生产循环单元的静态平衡问题和不确定条件修正过后的动平衡问题.针对确定工位条件下的混装生产线,构建其静态平衡模型,分析不确定因素,并以操作工人的操作时间不确定性为例,研究时间不确定性动态平衡.利用Flexsim软件,通过仿真进行了验证.相关实验验证了上述方法和结论的正确性.     

动态批次主元分析在化工过程中的应用研究

本文研究了批次动态主元分析(BDPCA)及其在化工过程中的应用.批次动态主元分析是主元分析的一种延伸,通过把三维矩阵转化成二维矩阵,结合时滞变量算法捕捉批次过程中的动态特性完成过程的监视并给出了确定时滞变量的算法.以TE过程为例,与多向主元分析法相比,仿真结果表明,BDPCA算法实现了考虑过程中的批次动态特性并提高了对过程变化的故障检测能力.     

Fault-Diagnosis Method Based on Support Vector Machine and Artificial Immune for Batch Process

A new fault-diagnosis method to be used in batch processes based on multi-phase regression is presented to overcome the difficulty arising in the processes due to non-uniform sample data in each phase. Support vector machine is first used for phase identification, and for each phase, improved artificial immune network is developed to analyze and recognize fault patterns. A new cell elimination role is proposed to enhance the incremental clustering capability of the immune network. The proposed method has been applied to glutamic acid fermentation, comparison results have indicated that the proposed approach can better classify fault samples and yield higher diagnosis precision.     

Characteristics of oxygen consumption of coal at programmed temperatures

Oxygen consumption is an important index of coal oxidation.In order to explore the coal-oxygen reaction,we developed an experimental system of coal spontaneous combustion and tested oxygen consumption of differently ranked coals at programmed temperatures.The size of coal samples ranged from 0.18~0.42 mm and the system heat-rate was 0.8℃/min.The results show that,for high ranked coals,oxygen consumption rises with coal temperature as a piecewise non-linear process.The critical coal temperature is about 50%.Below this temperature,oxygen consumption decreases with rising coal temperatures and reached a minimum at 50℃,approximately.Subsequently,it begins to increase and the rate of growth clearly increased with temperature.For low ranked coals,this characteristic is inconspicuous or even non-existent.The difference in oxygen consumption at the same temperatures varies for differently ranked coals.The results show the difference in oxygen consumption of the coals tested in our study reached 78.6% at 100 ℃.Based on the theory of coal-oxygen reaction,these phenomena were analyzed from the point of view of physical and chemical characteristics,as well as the appearance of the coal-oxygen complex.From theoretical analyses and our experiments,we conclude that the oxygen consumption at programmed temperatures reflects the oxidation ability of coals perfectly.     

1-氯甲基杂氮硅三环的合成

以甲基三氯硅烷为原料,采用氯化、醇解和酯交换等反应,合成了1-氯甲基杂氮硅三环,并通过单因素实验方法对合成工艺条件进行了优化。在最佳条件下,1-氯甲基杂氮硅三环的总产率可达到54.5%,与文献报道的比较,具有产率高、能耗低等优点。并对反应过程中的副产物氯化氢气体进行了回收,减少了环境污染。     

3D Modeling of the preparation process of metal rubber material

Based on the analysis of the preparation of metal rubber (MR) and two pivotal hypotheses,the uniform distribution and the unaltered topological structure of wires in the radial direction of columns in the punch process,a 3D parametrical model was established based on four approaches:helix-making,planar roughcast-weaving,planar roughcast-rolling,and 3D roughcast punching.In the modeling process,5 lattice types of weave patterns in planar roughcast were put forward,and 10 quantificational modeling parameters ...     

Treatment of methanol wastewater with two-stage and two-phase anaerobic process

The two-stage and two-phase anaerobic process (TSTP) composed of hydrolytic acidification reactor,first-order and second-order external circulation anaerobic reactors (EC) was taken to treat methanol wastewater. Test results show that TSTP process is quick start-up in 51 d, and the maximum VFA of hydrolytic acidification reactor effluent reaches 876 mg/L. Under the condition of volume loading of 6.56 kgCOD/m3·d, COD removal rate of the first-order EC reactor is about 85%, and under the condition of volume loading of 1.02 kgCOD/m3·d, COD removal rate of the second-order EC reactor is about 50%. When the inflow COD of TSTP process is between 7000-11000 mg/L, its effluent COD is lower than 600 mg/L. In the biological conversion process of methanol into methane,the production of acetic acids as an intermediate product can be ignored and the direct production of methane from methanol is predominant.