Investigation of Flow Patterns in Continuous‐flow Stirred Vessels by Laser Doppler Velocimetry

The flow structure of a continuous‐flow reactor stirred by a Rushton turbine was investigated by laser Doppler velocimetry for two different mean residence time‐mixing time ratios. Velocity measurements were obtained for two inlet locations, corresponding to the incoming liquid stream being fed co‐currently or counter‐currently to the flow discharged by the turbine. In all investigated configurations and for all operating conditions, it was found that the flow disruption caused by the incoming liquid stream was observable mainly in the first vessel quarter, which followed the feed‐tube plane. From comparison of the velocities encountered in the various planes in the continuous‐flow reactor to the velocities of the batch reactor, it was also concluded that it may be possible to intensify the usage of the turbine‐stirred vessel by decreasing the characteristic times ratio, without considerable flow by‐pass and/or short‐circuiting problems.     

航行状态下减摇水舱减摇能力仿真研究

本文根据“船舶-水舱”系统的运动模型,研究被动式减摇水舱在航行状态下的减摇能力。分别在不同海况、航速以及航向等条件下进行仿真,总结出水舱在不同航行状态下的减摇规律。并分析了可控被动式水舱的控制机理,为研究水舱的控制策略奠定了基础。     

坦克设计新发展

本文提出“针对式坦克发展战略”主要内容,它要求“突破性新概念高新技术”,获得“减法设计方法”,因而形成“坦克发展新道路”.运用“系统总体取胜”的系统工程理论,处理好坦克全系统“综合”、全系统与分系统“配置”、分系统与分系统“匹配”、全系统与人及作战环境“适应”四大关系,以“相互同水平组合”替代“单项高水平爬坡”.通过“从系统总体着眼、由边际零部件突破”的途径,善于从各个部分或部件之间的结合部加以突破,实现坦克设计新发展.     

ISS feedback control redesign for continuous stirred tank reactors

In this paper a new nonlinear feedback control law for continuous stirred tank reactors, obtained by exact Input/Output (I/O) linearization and Sontag's input‐to‐state stability feedback control redesign methods, is studied. By the new feedback control law, a significant attenuation of the disturbance effect is guaranteed, with evident improvement with respect to control laws obtained by the exact I/O linearization method. The performed simulations validate the theoretical results. Copyright © 2010 John Wiley & Sons, Ltd.     

Dynamical systems identification using Gaussian process models with incorporated local models

Gaussian process (GP) models form an emerging methodology for modelling nonlinear dynamic systems which tries to overcome certain limitations inherent to traditional methods such as e.g. neural networks (ANN) or local model networks (LMN).The GP model seems promising for three reasons. First, less training parameters are needed to parameterize the model. Second, the variance of the model's output depending on data positioning is obtained. Third, prior knowledge, e.g. in the form of linear local models can be included into the model. In this paper the focus is on GP with incorporated local models as the approach which could replace local models network.Much of the effort up to now has been spent on the development of the methodology of the GP model with included local models, while no application and practical validation has yet been carried out. The aim of this paper is therefore twofold. The first aim is to present the methodology of the GP model identification with emphasis on the inclusion of the prior knowledge in the form of linear local models. The second aim is to demonstrate practically the use of the method on two higher order dynamical systems, one based on simulation and one based on measurement data.     

Creating change and driving innovation in highly automated and lean organizations: The Temporal Think Tank™ (T3™)

This paper introduces the concept of the temporal think tank™ (T3™), a temporary in-house research center, based on case studies with a highly automated global manufacturer and in various small-sized manufacture (SME's). The T3™ brings individuals from across the organization together in a team setting in which they are charged to look at the future, develop their decision-making skills, and use entrepreneurial thinking to incubate new processes and/or products. After an appropriate time in the temporal think tank™, the individuals are asked to return to their regular positions to implement the best practices and best ideas and doing so spur the organization forward. At intervals, the temporal think tanks™ can be reconvened, or reconstituted with new participants. This approach prepares technology champions for the SME, who can return to the organization with a fresh outlook and renewed energy to keep the enterprise at the peak of efficiency and effectiveness.     

三聚氰胺装置中液位计的选用

通过对V-3131助滤剂槽上使用的吹气式液位计LT-36113的测量原理及使用情况分析,证明吹气式液位计在使用中的缺陷,从而说明使用雷达液位计的必要性,并表明雷达液位计将被广泛应用。     

基于Ethernet环境的液位模糊PID控制

针对现代工业生产及日常生活中都会遇到的液位控制问题,提出了一种智能控制算法—模糊PID控制算法。以单容水箱液位为研究对象,以罗克韦尔自动化Ethernet为平台,研究在Ethernet环境下实现模糊PID控制的方法;并且构建了基于网络的智能控制系统。实验结果表明,模糊PID控制算法控制精确度高,稳定性良好。     

基于反馈线性化的预测函数控制及其在CSTR中的应用

针对典型化工非线性对象连续搅拌槽反应器(CSTR),研究了基于反馈线性化的预测函数控制方法.首先将非线性过程精确反馈线性化,然后在此基础上,设计相应的预测函数控制器,仿真结果是令人满意的.     

坦克炮控系统的模糊滑模控制系统设计和分析

主要针对坦克炮控系统这一包含非线性和不确定性的复杂系统,提出了一种新的模糊滑模控制算法.该算法将模糊逻辑和变结构控制结合起来,利用模糊方法,在切换面临近的一个薄边界层内对控制的不连续性加以平滑,以减弱变结构控制产生的抖振.本文还对控制系统稳定性进行了分析,并给出了用MATLAB仿真的结果及实验结果.