时间码在音视频制作中的应用

介绍了音视频设备中常用的时间码及其在音视频节目制作中的典型应用     

Z-半导体敏感元件原理与应用——(3)温敏Z-元件及其应用

本文重点介绍温敏Z－元件的特性、典型应用电路、设计方法以及应用示例,供广大用户利用温敏Z－元件进行应用开发时参考。     

虚拟多结构光传感器昆虫运动参数测量系统

提出了基于单摄像机和双结构光投射器的虚拟多结构光视觉测量系统测量高扇翅频昆虫飞行运动参数.首先分析了光栅型结构光视觉的测量原理以及虚拟多结构光传感器的工作原理,针对昆虫的运动遮挡提出了多角度观测的没计思想,在此基础上建立了基于单摄像机和双结构光的虚拟多结构光视觉测量系统.实验结果表明,该测量系统可以实现固定飞行昆虫双侧翅膀运动参数的测量;该系统不仪降低了系统成本,而且避免了多摄像机同步驱动的复杂性.     

基于稳态模型的气体管道泄漏定位方法的研究

基于管道中气体流动的稳态模型,根据对温度的处理方式,分别提出气体管道泄漏定位的等温定位法和变步长龙格-库塔法。通过实际气体管道泄漏的实验验证对模型法的应用场合进行了分析,并对两种方法的定位效果进行了对比。通过非等温天然气管道泄漏的仿真试验,对温差大小、气体特性估算的准确度和算法中模型的简化程度对定位效果的影响进行了研究。仿真研究表明,管道两端气体特性估算的准确程度决定了算法的定位精度,而算法中的管道模型可以进行适度的简化。此外,变步长的龙格-库塔法在非等温管道上的泄漏定位效果要优于等温定位法。     

GE气化炉上升管与降液管环隙流体的应用研究

利用垂直管两相流的数学模型,对GE气化炉内上升管与降液管环隙中合成气-激冷水形成的两相流进行计算,归结出液位与持液量、流体流型的相互影响。     

微生物发酵过程优化控制技术进展

微生物发酵过程优化控制技术是发酵工程的重要技术。综述了近年来微生物发酵过程优化控制技术的研究现状,讨论了机理分析建模、黑箱建模、混合建模等发酵过程建模方法,对基于模型的优化控制策略进行了分析。指出了基于混合模型和多目标优化策略建立动态优化控制器,是微生物发酵过程优化控制的有效方法,并给出了实现优化控制需要解决的关键问题。     

应用群能量恒定粒子群优化算法的批次流加发酵过程批次间优化(英文)

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.     

不敏变换鲁棒Kalman滤波器在发酵过程中的应用(英文)

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.     

连续纺丝筒产生绊丝的设备原因分析及解决办法

绊丝是粘胶长丝连续纺丝筒出现的产品质量问题之一。对连续纺丝筒产生绊丝的原因进行了分析,对解决丝筒绊丝问题的方法做了介绍。     

基于自适应进化多目标约束的青霉素发酵过程优化EI北大核心CSCD

发酵过程多目标优化控制是提高发酵过程生产水平和经济效益的有效途径。提出了一种自适应进化多目标约束粒子群优化算法,并应用于青霉素分批补料发酵过程多目标优化。该算法根据不符合约束条件粒子的约束违反程度,修正了多目标粒子群优化算法的进化学习公式,提高了算法在约束边界区域的搜索能力;引入基于拥挤距离的Pareto最优解分布性动态维护策略,改进了Pareto前沿的分布性。实验结果表明,该算法能获得具有较好分布性的Pareto前沿,给出的底物补料策略能够使青霉素发酵过程在消耗更少底物的同时获得更多的产物产量,实现了发酵过程的多目标优化。