Online Delay—Evaluation Control for Networked Control Systems

This paper presented an evaluation approach of time delays for networked control systems (NCS). An improved scheme based on optimal LQG control was designed to achieve desired performance despite the uncertain delays in the system. The experimental results illustrate the effectiveness of the proposed control design and satisfactory performance of the closed-loop system.     

基于响应面法的SPS舱口盖结构多目标优化

本文以轻量化为前提,设计传统钢制板架舱口盖的钢聚氨酯夹层板(Steel-Polyurethane Sandwich plate,SPS)替代方案.对不符合结构刚度、强度要求的初步方案,采用基于BBD(Box-Behnken Design)设计的响应面法进行结构多目标优化设计,以结构变形和等效应力作为优化目标,结构尺寸及质量为约束条件,建立响应面模型,得到优化后的SPS舱口盖设计方案;并采用有限元仿真方法,对优化前后的方案进行了仿真计算,对优化目标进行了详细对比,验证了优化的有效性和必要性.对比结果表明:优化后的SPS舱口盖结构,在减重9.28％的情况下,变形减少了36.7％,应力降低了30.5％;说明采用响应面法对SPS舱口盖实现多目标优化可行,且优化效果明显.     

宣杭新线生活饮用水的供水卫生状况

宣杭新线生活饮用水的供水卫生状况芜湖铁路卫生防疫站（２４１００Ｄ）魏震，刘永春芜湖铁路环境监测站刘盾，查水清，卢思全华东第二通道宣城至杭州已于１９９３年上半年在长兴接轨开通，客货运输逐渐投入正常运营。为了解沿线洪水卫生状况，我们进行采样分析，对生活饮...     

Research on Network Delays of Networked Control Systems

In networked control systems (NCS), the main problem is time delays induced by communication network, which can deteriorate the performance of the systems, even cause the systems instability. If we know the exact network delays, we can compensate for their effect by modifying the parameters of the controller. Hence how to get the knowledge of these delays in the network is critical. This paper analyzed the different characteristics of network delays from sensor to controller and from controller to actuator and presented the methods of online evaluaticm of these delavs. The experiment shows these methods are valid.