基于PLC的车载通信设备自动化控制系统设计

针对传统车载通信设备控制系统一直存在易受复杂环境干扰和控制准确性差等问题。提出并设计基于PLC的车载通信设备自动化控制系统。该系统主要包括自动化模块、控制模块、通信模块,通过PLC技术构建自动化模块,对数据属性进行优化配置,完成数据信息的交互;根据信息反馈技术对通信信号载波进行调试,采用多渠道输送模式提高信号交换性能,实现车载通信设备自动化控制系统的设计。实验结果表明,采用改进设计的控制系统,相比传统控制系统,其控制精度增加、效率较高,同时具有较强的抗干扰能力。     

一种AGV调度用组合式无线通信模块的设计

针对目前AGV调度缺乏专用通信解决方案的情况,设计了一种“核心板+底板”的组合式无线通信模块,并制定了相应的通信协议。核心板以STM32F030C8作为控制器,通过ESP8266以串口无线透传方式与调度计算机通信;底板分为串口通信底板与开关量输入底板两种,主要用于将模块分别连接到AGV控制器与设备控制器。经实践证实,该模块掉线率基本在0.5%以内,通信稳定,同时具备安装方便、二次开发简单等优点,能适用于大部分基于WIFI通信的AGV应用项目。     

工业互联网下AGV智能小车的设计与实现

文章以STM32单片机作为主控L298N电机驱动,搭载ESP32作为蓝牙模块设计了一款AGV智能小车。文章针对多AGV智能小车间的避碰和协同作业问题,基于ZigBee无线通信技术搭建AGV智能小车间的信息交互网络,通过编写小车控制算法使同一作业区间的小车之间进行协同作业并优化作业路线。通过实践与测试,文章设计的AGV小车可应用于仓库小工件的搬运作业。     

手机蓝牙控制的智能车系统设计

设计了一种通过手机蓝牙实现对车载控制的系统.该系统由带蓝牙功能的智能手机和车载控制系统组成,车载控制系统通过蓝牙模块HC-06与智能手机建立蓝牙通信,并将蓝牙信号转换成串口信号,车载控制系统以STM32F103作为主控芯片,接收蓝牙模块传送的信号,驱动电机做相应的动作.在Android手机上开发应用软件,通过设计的按钮实现对车的停启和转动控制,另外通过滑动条实现对车的速度控制.该系统充分利用了智能手机触摸屏的灵活的操作功能,另外车载系统端的STM32F103处理器所带的PWM功能实现了对车的便捷调速功能.     

基于深度学习视觉和激光辅助的盾构管片自动拼装定位方法

隧道管片定位是实现盾构管片自动拼装的关键。文中提出了一种基于深度学习视觉和激光辅助相结合的盾构管片自动拼装定位方法,分别利用视觉系统和激光测距系统计算待拼装管片的平面位姿和深度位姿信息。其中,视觉系统基于特殊设计的双阶段卷积神经网络可以实现管片表面定位标志轮廓特征的有效提取,提取精度和识别率相比于现有算法具有明显的提高。实验表明所提出的盾构管片自动拼装定位方法能够满足盾构管片自动拼装定位需求。     

基于DSP的微小型四旋翼飞行器控制系统设计

文章针对微小型四旋翼飞行器的飞行控制系统,采用TI公司的高性能DSPTMS320F28335为控制器进行了模块化设计,系统各模块主要为控制器模块、传感测量模块、无刷直流电机调速驱动模块和无线通讯模块,文中分别对各模块的硬件和软件设计做了详细介绍。     

基于FPGA的FLASH控制器系统设计及实现

为了解决数字台标机中台标文件的存储问题,文中介绍了基于FPGA的FLASH控制器系统设计方法.说明了系统各个模块的功能原理以及各模块间的相互联系,阐述了FLASH读写控制器的设计过程,并着重介绍了通过设计有限状态机实现FLASH读写操作的方法,在QuartusⅡ中对设计进行了仿真验证,最后通过硬件测试证明了系统设计方法的正确性和可靠性.该方法对FLASH存储控制系统的设计具有普遍适用性.     

基于光纤陀螺的车载稳定平台控制方式研究

从光纤陀螺的固有特性入手, 结合车载系统对稳定平台的需求,对基于光纤陀螺的稳定平台控制系统进行了分析研究.针对稳定平台不同的工作方式,分析设计了3种不同的控制措施:静态快速定位、动态稳定保持、手动单杆控制.并对静态快速定位工作方式下的数字控制器进行了设计及仿真.     

嵌入式控制系统的VXI总线数据采集软件设计

嵌入式控制系统需要通过电子测量方式进行数据采集,为控制系统提供输入参量模型,采用VXI总线技术进行嵌入式控制系统的32通道控制数据采集和实时数据记录,方便控制系统和客户端现场分析数据.嵌入式控制系统的VXI总线数据采集软件是建立在对控制信息的特征采样和控制参量的信息输入基础上,进行VXI总线数据采集系统总体设计描述和功能指标分析,数据采集通过发射天线、接收天线、发射机、接收机、控制器等构件实现.数据采集系统的软件模块设计包括了通道设置、触发设置、数据端口设置、数据可视化模块设计和数据读取回放等子模块,通过软件优化设计实现VXI总线数据采集.实验分析结果表明,该系统进行数据采集的输入和输出的波形控制的匹配性能较高,稳定性较好,具有较高的数据采集精度.     

基于STC15W的水下机器人控制系统设计

为克服当前水下探测、水下救援的困难,设计了一台智能控制的水下机器人.该水下机器人控制系统以STC15W单片机为中央控制器,外围电路搭载了无线通信模块、陀螺仪模块、摄像头模块、舵机模块等.水下机器人工作时,陀螺仪、摄像头等模块实时采集水下环境参数,把它转换为电信号发送给单片机;单片机按预先设定的程序进行分析、运算;单片机...     

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.     

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.     

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.     

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.