具有参数不确定性的长时延网络控制系统研究

针对具有参数不确定性的长时延网络控制系统,提出了系统的建模方法,并且分析和讨论了系统的稳定性和控制器设计方法.当假设网络控制系统的传感机构为时间驱动,执行机构与控制器为事件驱动,被控对象具有参数不确定性以及网络诱导时延具有时变、不确定和大于单位采样周期的特点时,运用矩阵分析理论,将广义网络被控对象建模为一类含有不确定项的线性离散系统.基于Lyapunov稳定性理论和线性矩阵不等式方法,分析了闭环系统渐近稳定的充分条件,并推导出系统的控制器设计方案.仿真结果表明稳定判据的可行性与控制器设计的有效性.     

具有长时延和异步时钟的网络控制系统的故障检测

针对一类同时存在长时延和异步采样时钟的网络控制系统,假定其可能发生的故障,设计了系统的具有时延补偿功能的鲁棒H∞状态观测器,对其进行故障检测.当系统正常时,将观测器系统建模为一类具有不确定性的离散线性切换系统,基于该模型,利用线性矩阵不等式(LMIs)方法给出了系统鲁棒稳定性条件和H∞性能指标的求解方法;当系统发生故障时,观测器残差能够迅速发生跳变,从而检测出故障的发生.仿真示例验证了所提出方法的有效性.     

一种不定时延与数据包丢失的统一建模方法

研究更接近于实际情况的不确定性时滞丢包模型,人为设置数据包不确定迟延转化固定迟延的时间标准,而不是以数据包最坏情况的迟延为标准。数据包迟延超过固定迟延的时间标准即认为数据包“丢失”,也包括了数据包确实丢失的情形,从而把时延和数据包丢失建模统一起来,并且利用迟到的数据对“丢失”的数据进行预估补偿,而不是丢弃不用。仿真结果表明所提到的方法是有效的。     

基于因特网的共享控制系统接入设备的在线辨识

研究在基于因特网的共享控制系统中,服务器节点在时变时延的网络环境下对接入设备对象的在线辨识.分析网络环境下被控设备对象在线辨识的方法与理论难点,融合控制技术及网络通信技术设计网络环境下共享控制系统接入设备在线辨识的模型结构.实现了服务器节点在网络环境下对电液位置伺服控制设备的模型参数辨识.以无网络环境下对该设备的辨识结果为基准,二者辨识结果基本一致.结果表明,该方案实现了被辨识的设备对象与辨识的服务器在空间位置上的分离,扩展了系统辨识的应用范围.     

Controllability and observability of networked control systems with time-varying delays

The controllability and observability of networked control systems are studied. Aiming at the networked control system with time-varying delay, the sufficient and necessary conditions for complete controllability and complete observability of the system are presented, respectively. Because of Markov characteristic of the network-induced delay, in terms of stochastic theory, a sufficient and necessary condition for completely mean value controllability of networked control systems is obtained. Further, the conditions that the controllability and observability of networked control systems are equivalent to the initial time-invariant system are given. Controllability and observability realization indexes are also discussed, respectively. The numerical example demonstrates the effectiveness of the proposed theory.     

具有模糊校正的GPC在NCS中的应用

针对网络的引进而产生的时延及系统的不确定性问题,在GPC控制算法的基础上通过加入模糊校正的方法更好的解决了网络控制系统中系统模型失配和噪声干扰等对系统控制效果的影响,仿真结果验证了控制器设计方法的有效性.     

基于电力线载波通信的家电控制系统

电力线载波通信是用电力线路作为通信媒介进行数据传输。介绍了在低压配电线上用电力线载波专用芯片ST7536实现数据的传输,采用电力线载波形式,设计出了一个家电网络控制系统,对家电网络进行远程集中控制,可以对多路家用电器的运行情况进行实时监测和控制,并分析了电力线通信的通道特性及其干扰,结合电力通信的特点提出了解决办法。     

家电通用遥控器的开发

本文详细地介绍了家电通用遥控器的开发过程,重点是遥控器的通用性,实用性和经济性设计,该遥控器已投入生产,它将方便人们的生活。     

Environmental impacts of household appliances in Europe and scenarios for their impact reduction

Assessing the environmental impact due to consumption of goods and services is a pivotal step towards achieving the sustainable development goal related to responsible production and consumption (i.e. SDG 12). Household appliances plays a crucial role and should be assessed in a systemic manner, namely considering all life cycle stages, technological efficiency, and affluence aspects. The present study assess the impact of such household appliances used in Europe, and tests scenarios of potential impact reduction at various scales. Life cycle assessment is applied to 14 different household appliances (ranging from dishwashers to television devices) selected to build a set of representative products, based on their economic value and diffusion in households in Europe. Related impacts are calculated with the Environmental Footprint method for calculating a Consumer Footprint “appliances” for the baseline year 2010. A number of scenarios encompassing eco-solutions on a technical level, changes in consumption pattern, behavioral changes, as well as the combination of all these aspects are run to estimate the Consumer Footprint related to household appliances for the year 2030, compared against this baseline scenario. The baseline Consumer Footprint is confirming the importance of the use phase in leading the impacts in almost all impact categories. Testing different scenarios concludes that there is a reduction of the impact for most of the categories (with up to 67% for the ozone depletion potential, and still around 35% for the global warming potential), while two of the here examined impact categories (i.e. land-use and mineral resource depletion) show an overall potential that is even negative – i.e. the results of all scenarios are higher than the ones of the 2010 baseline scenario. The increase in purchase and use of such appliances may offset energy efficiency benefits in some of the examined categories. Hence, the assessment of sustainability of appliances consumption should always include several scales, from the efficiency of the products (micro scale), to the improvement of the energy mix (meso scale), up to accounting for socio-economic drivers and patterns of consumption affecting the overall appliances stock (macro scale).     

Fault detection observer design for networked control system with long time-delays and data packet dropout

Focusing on the networked control system with long time-delays and data packet dropout, the problem of observerbased fault detection of the system is studied. According to conditions of data arrival of the controller, the state observers of the system are designed to detect faults when they occur in the system. When the system is normal, the observers system is modeled as an uncertain switched system. Based on the model, stability condition of the whole system is given. When conditions are satisfied, the system is asymptotically stable. When a fault occurs, the observers residual can change rapidly to detect the fault. A numerical example shows the effectiveness of the proposed method.