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State estimation is the precondition and foundation of a bioprocess monitoring and optimal control. However, there are many difficulties in dealing with a non-linear system, such as the instability of process, un-modeled dynamics, parameter sensitivity, etc. This paper discusses the principles and characteristics of three different approaches, extended Kalman filters, strong tracking filters and unscented transformation based Kalman filters. By introducing the unscented transformation method and a sub-optimal fading factor to correct the prediction error covariance, an improved Kalman filter, unscented transformation based robust Kalman filter, is proposed. The performance of the algorithm is compared with the strong tracking filter and unscented transformation based Kalman filter and illustrated in a typical case study for glutathione fermentation process. The results show that the proposed algorithm presents better accuracy and stability on the state estimation in numerical calculations. 相似文献
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棉织物漂练半成品疵点的成因及防治 总被引:2,自引:2,他引:0
对棉织物染色生产中经常遇到的漂练半成品烂棉斑、半成品折子、布面不净和漂练去杂不净等质量问题,分析其成因,并提出预防方法. 相似文献
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针对流程工业管理信息系统中报表系统灵活性差的问题,提出了一种基于Silverlight的柔性报表系统的设计方法.该方法采用Silverlight技术在客户端实现用户表现层和业务逻辑层功能,利用XML技术将报表样式与报表数据分离,通过自定义XML标签实现报表的灵活配置,采用Web Service技术实现客户端与服务器端之间的数据交互.给出了柔性生产报表系统架构与实现方法,在.NET平台下设计了由报表柔性编辑模决、报表生成模块和报表显示模块等组成的柔性生产报表系统.实际应用表明,采用Silverlight技术开发的柔性生产报表系统能够实现报袁的灵活生成. 相似文献
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针对约束边界粒子在边界区域搜索能力不足的问题,提出一种基于自适应进化学习的约束多目标粒子群优化算法。该算法根据不符合约束条件粒子的约束违反程度,修正优化算法的进化学习公式,提高算法在约束边界区域的搜索能力;通过引入一种基于拥挤距离的Pareto最优解分布性动态维护策略,在不增加算法复杂度的前提下改进Pareto前沿的分布性。实验结果表明,所提出的算法可以获得具有更好收敛性、分布性和多样性的Pareto前沿。 相似文献
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An iterative optimization strategy for fed-batch fermentation process is presented by combining a run-to-run optimization with swarm energy conservation particle swarm optimization (SEC-PSO). SEC-PSO, which is designed with the concept of energy conservation, can solve the problem of premature convergence frequently appeared in standard PSO algorithm by partitioning its population into several sub-swarms according to the energy of the swarm and is used in the optimization strategy for parameter iden-tification and operation condition optimization. The run-to-run optimization exploits the repetitive nature of fed-batch processes in order to deal with the optimal problems of fed-batch fermentation process with inaccurate process model and unsteady process state. The kinetic model parameters, used in the operation condition optimization of the next run, are adjusted by calculating time-series data obtained from real fed-batch process in the run-to-run optimization. The simulation results show that the strategy can adjust its kinetic model dynamically and overcome the instability of fed-batch process effectively. Run-to-run strategy with SEC-PSO provides an effective method for optimization of fed-batch fermentation process. 相似文献
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采用不同的挤压速度和挤压温度对机械外壳用6061-0.8V新型含钒铝合金试样进行了挤压成型,并进行了力学性能的测试与分析。结果表明:随挤压速度由2 m/min提升至4.5 m/min,挤压温度由375℃升高到475℃,机械外壳用6061-0.8V新型含钒铝合金试样的抗拉、屈服强度先增大后减小,断后伸长率变化幅度较小,力学性能表现为先优化后下降。相比于2 m/min,3.5m/min速度挤压时的抗拉强度和屈服强度各增大了18、16 MPa;相比于375℃,425℃温度挤压时的抗拉强度和屈服强度各增大了20、24 MPa。机械外壳用6061-0.8V新型含钒铝合金挤压成型较佳的工艺参数选择为:挤压速度3.5 m/min、挤压温度425℃。 相似文献