Ensuring the stability and constant controlled parameters of the output of a multi-input and multi-output (MIMO) networked control system under interference is an important research topic in the field of automatic control. Based on the state feedback of linear systems, a linear quadratic (LQ) control method that maintains zero output error is proposed. The stability conditions of the closed-loop system are given. By using integral control and finite-time LQ tracking control strategy, the stability of the output of the closed-loop control system is protected. Simulation results show that this control strategy can effectively reduce the system's convergence time and ensure output stability under interference.

To solve the Denial of service (DoS) attack problem in communication channel between sensor node and controller node in Cyber physical system, a multi-step compensation control strategy was proposed. Firstly, a DoS attack model is established based on the existence of multiple sampling periods in a single control period. Secondly, under the condition of DoS attack, one constructed object simulator is used to simulate the state information lost by receiving the latest transmitted state and control information successfully. Finally, through the simulation input and double output a plant with double, it is shown that the multi-step compensation control strategy can make the system run stably in a certain control period.

Aiming at the problem of MIMO objects parameter identification in process control, this paper adopts attenuation factor recursive least square method to identify the MIMO objects parameter. This algorithm is based on the advantages of recursive least square method for online identification of linear MIMO objects and nonlinear MIMO objects. On the basis of adding attenuation factor into recursive least square method, the algorithm formula of attenuation factor recursive least square method and the basic steps of using this algorithm for parameter identification of MIMO objects are given. Through the simulation experiment of parameter identification of double input and double output object, it is proved that the attenuation factor recursive least square method can realize parameter identification, and improve the accuracy and convergence of parameter identification.

Replay attack measurement of networked control system based on digital watermark JIE Xin-chun1,2, FEI Min-rui1†, DU Da-jun1 (1. School of Mechanical Engineering and Automation, Shanghai University, Shanghai 200444, China; 2. School of Information and Engineering, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China) Abstract: With the wide application of networks in control systems, the process of data replay attacks and keeping the stability of networked control systems is a problem that the researchers must consider. On the basis of establishing a control system including a control network and a measurement network, a data transmission method between sensor nodes and controller nodes is proposed. The mathematical model of the networked control system is given. Considering the presence of the replay attacks to the controller nodes, a real-time anomaly detection method is presented on the basis of adding the time stamp in the data frame. The strategy of adding digital watermarking and chi-square goodness of fit test are described in detail. The simulation results show that the detection method of goodness of fit test can detect the replay attack actions in real time. The method has certain application prospects and popularization values.

With the wide application of networked control systems, how to deal with data injection attacks and maintain the stability of control systems including wireless multi-hop networks is a problem that the researchers and technological workers must consider and solve. Based on the construction of a control system including wireless multi-hop networks, the data transmission mode between routing nodes and the stability condition of the control system are given. Considering the existence of data injection attacks to routing nodes, a real-time detection method for anomaly behaviours is presented on the basis of chi-square goodness-of-fit test. In the case of data injection actions taking place, a strategy of switching paths in turn is used to execute the control task. The strategy is satisfied with the resilient stability of the control system. The simulation results show that the detection method can detect the data injection actions in real time, and the control strategy can restore control variables to proper values when the data injection actions exist. These methods have certain application prospects and popularisation values.

Because of the high integration of control, communication, computer and network technology, how to deal with various anomaly behaviors of control systems is a problem that should be solved by researchers. Especially some activities such as data injections, DoS attacks and device failure must be considered. Based on the analysis of dynamic behaviors of industrial process control systems with varying process state variables, a data mining method is proposed on summarizing normal behavior features of the control systems. Depending on association rules, a similarity factor is formulated using a real-time data mining method for describing the likeness between real-time frequent itemsets and normal frequent itemsets. Representative values of change behaviors for process variables and the corresponding generation method are illustrated in detail. On the basis of comparison between several real-time frequent itemsets and the normal frequent itemsets, a reliability parameter is given to describe the abnormal status of a control system within a certain time. Simulation results show that the proposed method can detect anomaly behaviors of a process control system in time, which has practical significance in industrial applications.

It use the infrared system to consider blast furnace shaft and a complex bosh condition, and a method of online measurement is applied in those, and these are implemented by the temperature online detection sensor system. This system is composed of five parts including the heat transmission me-dium, photoelectric conversion module manufacturers, wireless transmitting module, wireless receiving module and upper computer. The part of photoelectric conversion module manufacturers is mainly dis-cussed , this online measuring system provide theoretical basis to the temperature from many viewpoints of emissivity, CCD camcorder and sensibility.

针对微电网运行时惯性不足、容易产生电压频率波动及单一储能无法同时满足能量密度和功率密度要求等问题,提出了基于蓄电池与超级电容混合储能的分层平抑功率波动方案及相关控制策略.兼顾各储能介质的充放电功率约束、荷电状态约束以及平抑功率波动的柔性约束条件,采用自适应协调下垂控制方法并在优化储能容量配比的基础上进行功率波动抑制,有效发挥了两类储能的互补优势,提高了经济效益,解决了微电网发电受外界环境影响等关键技术问题,保证了电能质量.仿真结果证实了控制策略的可行性.

It is one of the most important research topics in the field of automatic control to ensure stability of networked control system and keep controlled parameters unchanged in the presence of data injection attacks. On the basis of linear system state feedback, a linear quadratic (LQ) method keeping output error close to zero is presented. Stability condition of closed-loop system is given. Using integral control and LQ infinite time tracking strategy, a protective closed-loop control system is illustrated in detail. Simulation results show that the control strategy can reduce or remove the influence of illegal injecting data at sensor’s output terminal in some degree. Controlled parameters are limited within small variation range. The control method has certain application prospect and popularization value.

MAC mechanism is an important factor affecting the real-time in the fieldbus system.After analysis without changing the MAC mechanism premise,the mechanism is improved through the application layer MAC scheduling algorithm.The paper uses STM32F103 microcontroller,SPC3 chip,MAX485 chip and other hardwares in the Profibus protocol to achieve high level of real-time water monito-ring system with the application layer scheduling algorithm.

At the request of the sustainable development strategy, improving our energy management level and efficiency becomes an important researching subject for scientific and technological practitioners. On the basis of analysing the actual situation of energy management in our country, based on non-contact IC card technology, the valve control device that can control the flow of media in accordance with future time has been designed. The flow control mode of the time control valve is introduced, and the operating modes and implementing methods of read/write circuit of IC card, the real time clock circuit, and the motor driving circuit are described in detail. The test results indicate that in generally specking this control device can satisfy the requirements of industrial and agricultural users and possesses certain practicability and promotional value.

MAC protocol of bus control network has important influence on its real-time feature. Combining Profibus-DP protocol and Token Bus protocol, a new bus model suitable for small-scaled control system is put forward. Under the principle that follows a control network whole balance, the LAS and GAPL maintenance process in token passing mode and master-slave polling process in data exchange mode of Profibus-DP are discarded. The basic cutting thought of this bus model is summarized; its concrete realization is illustrated in detail, theoretical maximal value of message transmission time and actual test result are presented. The experiment result shows the system’s real-time characteristic is improved, and come to the expectant result.

On the basis of actual situation of agricultural irrigation in China,agricultural irrigation hydropower management system is proposed by using wireless network technology,which has characteristics of remote automatic measurement and identification of the IC card.And the topological mode of system data is introduced.Then,the data transmission mode and implementation method of hydropower controller,communication controller and center computer are illustrated in detail.Finally,the hardware circuit of communication controller is designed.Experimental results show that the wireless transmission network can satisfy the requirement of agricultural irrigation in a certain extent,which has some practical and promotion value.

在分析了当前车量称重技术的基础上,提出了一种基于RS485和工业以太网技术的车辆自动称重系统的设计方案,介绍了系统结构,详细阐述了数据传输方法,并给出了部分接口电路。试验结果表明,该总线型车辆自动称重系统满足数据采集与控制的要求,实时性强,达到了预期效果。

"测控仪表"类课程是测控技术与仪器、自动化、化学工程与工艺等众多专业的必修课程。紧密结合实际,通过总结多年的教学经验,详细阐述了该课程的实践性教学内容与方法。实践表明,该内容和方法切实可行,可收到很好的教学效果,对培养高级应用型人才具有重要意义。

在教学中以开放式试验教学为手段,培养学生学习的兴趣,将学生引向自主学习。实践表明,以学生为本的开放实验教学模式顺应了时代发展的需要。该方法促进学生形成自主学习习惯,培养学生耐心细致、持之以恒的学习态度,以及对逆境与困难的应变能力、对失败和挫折的承受能力。

分析了智能化仪表的课程特点及教学现状,采取理论分析与教学实践相结合的方法,对智能化仪表课程进行了教学改革探索。实践表明,通过教学改革能够提高普通高校工科学生实际动手能力、有效培养学生的创新意识和综合能力,符合高校培养应用型和开发型人才的目标和市场对人才的需求。

Aiming at the situation that the efficiency of data transmission between nodes in token bus control system decreases when the numbers of the nodes in the system increase,by combining the technologies of FPGA and industrial Ethernet,a bus-type control system which strongly meets real-time requirement is proposed.Through dividing the whole system into several token bus sub-networks,and linking the sub-networks by industrial Ethernet,the real-time performance of the whole system is enhanced.The test result shows that the data communication among nodes is well with real-time performance and reaches predictive effects.

本文提出了测控技术与仪器专业新版培养方案的制订原则以及课程体系的构建方法。即"加强基础、注重素质、拓宽专业口径、增强适应性",以适应内蒙古科技大学培养应用型人才的办学定位。

In case of high real-time requirement,transmission means and transmission time of effective data between nodes in a bus control system have important influence on the system's whole performance.Therefore how to improve transmission efficiency of the effective data among nodes becomes an important subject for research.On the basis of analyzing popular field-bus of industry at present and by using FPGA technology,a new token-bus structure is presented which is suitable for small-scale control system.Its topological mode is introduced,and the data transmission means at data link layer,type of real-time data and frame form are illustrated in detail.Hardware circuit of node was designed.Interface functions of application layer,theoretical maximal value of data transmission time and actual test results are given.According to simulation and experimental results,the network has high real-time performance,and can satisfy the communication request of industry measurement/control system.