贵州电视台播控中心数字总控系统的建设

总控系统是电视台播控中心的核心部分。本文介绍了贵州电视台新的播控中心系统的设计思路，并仔细介绍了总控矩阵，同步控制和时种系统、技监系统、信号和系统设备监控报警系统。     

高清总控调度与播控切换系统设计与实现

作为扬州电视台新闻综合频道高清播出系统的重要组成部分,高清总控调度与播控切换系统所起作用举足轻重。本文主要从高清总控调度系统、高标清同播模式选择、高标清幅型变换方案、高清播控切换系统、高清总控与播控监播系统等方面介绍扬州电视台高清总控调度与播控切换系统设计与实现情况。     

高清总控调度与播控切换系统设计与实现

作为扬州电视台新闻综合频道高清播出系统的重要组成部分,高清总控调度与播控切换系统所起作用举足轻重。本文主要从高清总控调度系统、高标清同播模式选择、高标清幅型变换方案、高清播控切换系统、高清总控与播控监播系统等方面介绍扬州电视台高清总控调度与播控切换系统设计与实现情况。     

IP交换为核心的高清/超高清总控系统设计及关键技术探讨

本文以广东广播电视台高清/超高清播控中心总控系统为例,对IP化系统部署进行梳理,旨在提供IP高清/超高清总控系统的设计思路,分享系统的架构及技术难点等实践经验。     

广播电视台电视播控系统设计和实现

本文首先分析了广播电视台电视播控系统设计原则,其次从系统整体架构、总控调度系统设计方案、IP播出系统设计方案等方面提出了广播电视台电视播控中心系统设计方案,最后为确保设计有效实现,并达到预期系统建设目标,笔者还提出了维护与风险防护的具体措施,以供广大工作者参考和借鉴。     

立足台情 追求先进：内蒙古电视台总控卫视播控系统设计综述

电视播控中心是电视台节目信号传输的枢纽，技术地位至关重要，本文以内蒙古电视台总控，卫星播控系统的设计，安装为例，详细阐述了播控系统的设计思路，设备选型的原则，主要设备的特性及工艺布局。     

浅析电视台数字播总控系统之改造

本文介绍了新余电视台数字播总控系统改造。首先,简介了设备现状、系统设计目标与规划;其次,从服务器与存储系统、总控系统、分控系统、播控系统软件等多方面。阐述了新余电视台数字播总控系统的改造项目的具体实施方案。     

立足对情追求先进

电视播控中心电视台节目信号传输的枢纽，技术地位至关重要。本文以内蒙古电视台总控、卫视播控系统的设计、安装为例，详细阐述了播控系统的设计思路，设备选型的原则，主要设备的特性及工艺布局。     

立足台情 追求先进——内蒙古电视台总控、卫视播控系统设计综述

电视播控中心是电视台节目信号传输的枢纽，技术地位至关重要。本文以内蒙古电视台总控、卫视播控系统的设计、安装为例，详细阐述了播控系统的设计思路，设备选型的原则，主要设备的特性及工艺布局。     

电视播控与总控系统搬迂工程设计与实践

本文从电视播控新机房播控与总控系统功能设计、新机房交流供电系统设计、新机房播控与总控系统集成施工、播控与总控系统搬迁进度安排、播控与总控系统传输链路技术指标测试等方面，对我局2004年实施完成的电视播控与总控系统搬迁工程，进行了较详细的总结与介绍。     

Content-based deep communication control for networked control system

In smart cities, the networked control system plays a significant role in transportation systems, power stations or other critical infrastructures, and it is facing many security issues. From this point, this paper proposes a content-based deep communication control approach to guarantee its security. Based on the layer architecture, this approach analyzes the interactive content in depth according to different industrial communication protocols, and implements the access control between two distinct enclaves. For OPC Classic, we acquire the dynamic port provided by OPC server, and open a new connection belonging to this port; for Modbus/TCP, we not only analyze the ordinary function codes and addresses, but also check the register or coil values by using the multi-bit Trie-tree matching algorithm. Besides, the white-listing strategy is introduced to satisfy the special requirements of industrial communication. Our experiment results show that, on the one hand the proposed approach provides OPC and Modbus/TCP defenses in depth; on the other hand it has less than 1 ms forwarding latency and 0 packet loss rate when the rule number reaches 200, and all these meet the availability requirements in the networked control system. In particular, this approach has been successfully applied in several real-world petrochemical control systems.     

基于TRICON控制系统防喘振控制算法

喘振是造成压缩机损坏的重要原因,在此针对某厂70万吨/年烯烃项目,根据丙烯工艺流程,设计了一套压缩机的防喘振控制系统。该控制系统以TRIEW软件为人机界面,利用TRICON独有的防喘振控制软件包,将喘振PID控制、喘振超驰、手动控制算法相结合,通过喘振PID参数的在线优化,有效地实现了压缩机的防喘振控制,现场实际运行结果表明了该系统的稳定性和可靠性,同时,验证了该喘振控制算法的有效性。     

Modeling and control for smart Mesoflap aeroelastic control

This paper introduces a novel concept termed Smart Mesoflaps for Aeroelastic Recirculation Transpiration (SMART) to render mass and momentum transfer for controlling shock/boundary-layer interactions in supersonic jet inlets. The SMART concept consists of a matrix of small flaps designed to undergo local aeroelastic deflection to achieve proper mass bleed or injection when subjected to shock loads. To optimize the performance of this system, NiTi shape memory alloy is used as an actuator for the flaps to control the amount of recirculation. The focus of this paper will be the subsystem modeling and control of a single flap. After a relatively detailed model is developed, a simpler model is generated, and it is experimentally shown that this approximation is adequate for control purposes. Next, the control strategy for this subsystem, subject to hysteresis and actuator saturation, is presented. A basic proportional integral derivative (PID) controller is enhanced using a hysteresis compensator (HC) and an error governor (EG). A generalized error governing scheme for PID controllers to compensate for actuator saturations is also developed. This EG method is generalizable to any stable process controlled by a PID. Finally, the PID with HC and the error governing method is experimentally applied to a benchtop SMART subsystem.     

Throttle actuator control system for vehicle traction control

Accurate and quick positioning of the throttle valve in a gasoline engine is required to implement various systems such as traction control systems (TCS), cruise control systems and drive-by-wire systems. In this research, the throttle actuator system for TCS application was developed. Unlike other systems, this system consists of only one throttle body to obtain small volume and low manufacturing cost, and uses a DC servo motor for quick and accurate responses. In order to drive the DC motor, a PWM signal generator and PWM amplifier were built and interfaced to the motor and controller. This paper also presents the position control logic of the throttle actuator with the TDC (time delay control) scheme with a variable reference model. By varying the reference model based on the size of the step changes in the target throttle angle, the TDC scheme yields good transient response characteristics in that both overshoot prevention and a quick response time are achieved. Actual vehicle tests with this developed system incorporated with the TCS system show that it satisfies all the conditions required for the TCS operation.     

基于自适应模糊理论的某型无人机起飞控制方法

基于合理简化的无人机纵向模型,设计了一种自适应模糊控制器,该控制器将Takagi-Sugeno模糊系统与等效控制器相结合,以增强系统的鲁棒性.只要求预先知道系统的相对阶以及未知函数的上下界即可,不需要精确的数学模型.Lyapunov合成方法证明了跟踪误差能趋近于零且其余的控制信号均有界.最后,结合优先级按比例分配的控制分配器,给出了存在扰动情况下飞行控制系统的仿真结果,表明即使在模型部分未知的情况下,该系统仍然能够达到飞行控制的指标性能和品质要求,验证了该方法的有效性.     

水泥配料控制中控制算法的研究

配料是水泥生产过程的重要环节,在一些连续称量配料工艺过程中,以往大多通过控制每种物料的瞬时流量来满足工艺要求,但往往误差较大,给生产带来不良影响。为提高控制精度,提出了一种偏差加权累积量控制PID算法,并在水泥生料配料控制中进行了实施,实验结果表明该算法能有效地抑制和消除系统过量超调和不停振荡,且对于某些不要求每个瞬时值都控制给定值的量,该算法可以避免调节阀的频繁动作并大大提高调节品质。偏差加权累积的PID控制算法具有简单、方便、易于实现的特点,且在水泥生料配料控制中取得了理想的效果,有很好的推广前景。     

Adaptive ABR congestion control with active buffer control

ATM Forum has defined that the ABR service is designed mainly for data traffic. The design of a simple and efficient congestion control scheme is a problem that network managers have to face. In this paper, we propose a control scheme for ABR service for better scalability and response. The scheme uses both the load level and an increase in queue length to detect the presence of congestion. Continuous control functions are designed for the bandwidth allocation. A better buffer control is achieved by incorporating the percentage of buffer occupancy into the control function. All of the control functions are designed in such a way that they are sensitive to the change of the system states when they are far from the optimal level to get a fast response, but insensitive and change slowly when the states are close to the optimal level to keep the system around the steady state. Our simulation results show that the algorithm is fair to all the connections and it converges fast when the network's condition changes. Copyright © 2001 John Wiley & Sons, Ltd.     

模糊PID控制在锅炉燃烧系统中的应用

针对目前锅炉存在的能耗高、燃烧不完全、污染环境、热效率低的缺点,设计了一种新型锅炉燃烧系统.该系统采用PID串级和Vague集分时控制,有效地提高了锅炉控制质量.     

Suboptimal digital control systems with bounded control inputs

Bounds on the control inputs to a linear system are dealt with in a manner suitable for online computer control. The method guarantees that for r control inputs the constrained optimum will be located in, at most, r steps.