A fuzzy PID based electro-hydraulic position servo control system was designed as a servo actuator for the active vehicle suspension to meet the requirements of the heavy vehicle stability during driving. Based on the physical structure and working characteristics of the electro-hydraulic position servo actuator, the transfer functions of each link of the system were derived. Using MATLAB/Simulink to simulate and analyze the dynamic response and signal tracking ability of the system, the unit step response curve when the load of the closed-loop system changes, and the sine wave input and output curve at different frequencies, were obtained and analyzed. The results show that the maximum overshoot of unit step response of the electro-hydraulic position system based on PID and fuzzy PID control is 19.5% and 0respectively, and the adjustment time is 251 ms and 117 ms respectively. When the load quality changes, the unit step response of the system based on PID control fluctuates significantly, while the unit step response of the system based on fuzzy PID control basically remains unchanged. When inputting sine wave signals of different frequencies separately, the tracking performance and steady-state error of the fuzzy PID control system are significantly better than the control effect of PID. Therefore, the electro-hydraulic position servo system under fuzzy PID control achieves position control output under different load masses and tracking performance of the system at different frequencies, and meets the stability and speed requirements of the system.

为满足电化学分析测量需求,基于三电极体系工作原理,提出一种技术指标高、成本低廉的电化学测试系统方案.该方案以STM32F373为控制核心,通过基于AD5541的DAC信号发生电路、高精密运算放大器为主要器件构成的恒电位仪电路、多个电流量程选择的电流检测电路、电流电压采集电路、无线通信电路等,实现了电化学测试系统的软硬件设计.实际测试表明:该系统具有精度高、成本低、可靠性高的特点,可以满足电化学测量的需求.

针对直流减速电机带动复杂负载运动仿真建模困难、控制效果不佳的问题,提出一种在Simulink仿真软件中使用Simscape库搭建直流减速电机及驱动电路、传动系统和复杂负载物理模型的方法,采用基于反步法滑模控制算法实现直流电机带载工况下的精确位置跟踪.在仿真软件中建立的电机与负载的物理模型相对于数学建模能准确建立扰动模型,解决了多刚体动力学系统数学建模困难的问题.仿真实验结果表明:对比传统的PID和模糊控制算法,本文所述控制方法不会产生超调与振荡现象,适用于复杂直流电机带动负载的运动系统精确位置跟踪控制.

恒温水浴锅是化学实验、化工生产中常用的控温设备.市场上所售恒温水浴锅大多控温热惯性大,恒温性能差,很难满足温度控制指标要求.为此,提出基于模糊RBF神经网络PID控制恒温水浴锅系统的研究方法,首先,在控制水浴锅水温度过程中,通过提取控制温度的PID参数,生成最优模糊域,根据模糊域范围,输出在不同温度下适当的调节值,应用RBF神经网络自我调节,使产生数据通过输入层、模糊化层、模糊推理、输出层,将信号传递水浴锅内的加热丝,以此实现高效温度控制,解决了装置控温调节时间长、超调量大、甚至出现震荡等问题[8].为实现精确恒温水浴锅控温在工业生产中广泛应用提供技术支持.

为了研究半桥变换器中开关管驱动电路、功率变压器、输出滤波电感等参数对工作状态和技术指标的影响,基于电源仿真软件Saber建立了半桥变换器开环电路模型.给出了半桥变换器中功率变压器和输出滤波电感等关键参数的计算方法.采用分段线性分析法、小纹波近似分析法和伏-秒平衡条件对半桥变换器进行稳态分析,推导了输出滤波电感在连续导通模式下(CCM)和不连续导通模式下(DCM)输出、输入函数关系式.分析了半桥变换器CCM工作模式的输出电感、负载电阻和占空比的临界值计算方法.对所建的半桥变换器开环模型进行仿真,仿真结果验证了理论推导的正确性,据此给出了提高半桥变换器稳态性能和工作效率的参数设计方法,为半桥变换器设计提供了理论依据.

三相变频电机或伺服电机是基于SPWM信号驱动的,SPWM信号的相序与电机运转方向相关,若方向接反将导致严重的安全事故.传统的相序检测方法只能对正弦信号进行鉴相分析,不能检测变频器或伺服电机驱动器输出的三相SPWM信号相序.文中提出基于FFT的三相SPWM信号相序检测方法,在Matlab/Simulink仿真软件中对检测电路建模,通过FFT算法对所建模型进行仿真分析,仿真结果表明,文中所述方法能够准确检测三相SPWM信号的相序.

准确检测锅炉承压管线泄漏是保障锅炉安全运行的关键技术,音频分析法是检测承压管线泄漏故障的主要手段,提出一种基于联合时频分析(Joint Time-Frequency Analysis,JTFA)研究锅炉背景声和承压管线泄露声的时频特征,判定泄漏故障的方法.设计了由前置放大、程控滤波、增益补偿处理的双通道音频信号采集电路;采用快速傅里叶变换获取信号广义谱特征,采用程控滤波对采集信号加动态频率窗,再采用短时傅里叶变换对采集信号时间加窗,多角度分析信号的时频特征,以判定承压管线运行是否存在泄漏故障.相比于传统的RC滤波加快速傅里叶变换分析方法,这种动态加双窗的时频分析法能够提高泄漏信号采集的灵敏度和泄漏故障判定的准确性.

提出一种多路两线制传感器在系统模拟/数字信号线路复用传输的接口方案,该方案采用主从式信息传输架构,主机单元可以扩展连接多达256个两线制音频信号采集终端.智能型音频信号采集终端在采集音频模拟信号的同时,通过信号复用线路技术在线接受主控单元的数字指令,实现音频信号采集终端的在线编程、自校准和故障自诊断功能,在很大程度上提高了系统的信息化和智能化水平.该技术已经成功应用于锅炉承压管线泄漏检测系统.

油/水浴锅被广泛应用于蒸馏、干燥、浓缩以及化学品合成等领域.利用最小二乘法,对油/水浴锅控温系统进行参数辨识并建立了仿真模型.针对油/水浴锅控温高精度、快响应的技术需求,设计了串级控制器.采用粒子群算法整定了控制器参数,通过实验对比验证了模型的精确度以及控制器性能.实验结果表明,通过最小二乘法所辨识的系统模型与实际系统的动态变化规律保持高度一致,所设计的串级控制器相比于单闭环PID控制器,具有更好的控制效果和鲁棒性,实现了对油/水浴锅温度的精准控制.

在简要总结国内外机器人发展现状的基础上,以地方工科院校视角,从基本理论与基本实验的一体化、综合理论与工程教育的一体化、交叉理论与创新实践的一体化角度,提出工业机器人育人体系建设思路,并对加快推进工业机器人教育的举措进行了探讨.

A study for servo-control technology of multi-DOF robot is proposed, the structure of control system and principle of servo driver circuits for DC motor with low inertia presented.The experiment results are reported, indicates that the position tracking performance of motor meets the dynamic specifications of control system using modified PID algorithm.The servo-control technology based on CAN bus offers high potential in multi-DOF robot control applications due to its advantages of low cost, simple structure and high reliability.

介绍一种高精度数控电阻箱的设计方法.阐述了通过采样激励电压,精确控制工作电流,模拟电阻负载的原理.详细分析了通过混合信号片上系统C8051F410、高精度AD转换器AD7715和精密运算放大器OP27A实现数控电阻箱的硬件电路,并给出了提高输出精度的软件处理方法.设计的数控电阻箱与传统的电阻箱相比,具有操作直观、精度高、体积小、可靠性高等优点,适用于作为直流负载的应用场合.

This paper introduced a design method of intelligent switching power supply. Information exchange in this design was based on fieldbus communication protocol. C8051F410 SOC was designed as the master control unit. Switching power transforming unit was controlled by DAC which lied in the C8051F410 SOC. In this way,steady voltage output and automatic load current distribution could be finally realized. This paper not only analyzed the circuit design principles and software design process was provided. Power supply controlled in the way of intelligence and digitalization had the ability to realize input-output isolation and automatic load current distribution in parallel circuit.

This paper introduces the course construction of Principle and Application of Single-chip Microcomputer. It focuses on the analysis of the importance of the construction,starting point,ideas and steps of construction with Three-threemodern engineer training mode as the basis,which has significance for the construction of other major courses.

This paper introduces a design of precision and intelligent electroplating power supply which is composed of C8051F410 microcontroller and peripheral circuit. Adaptive PID algorithm makes it supply constant current with high efficiency and high precision. It is widely suitable for automatic control of the precious metal electroplating process.

This paper mainly introduces the innovative experimental zone construction of the electrical specialty based on the three-three typemodern engineer training mode,elaborates the framework of the three-three style modern engineer training mode,analyses the feasibility and specific measures of constructing the experimental zone and describes the results obtained in the establishing process.The practice proves that the process of the innovative experimental zone construction of the electrical specialty based on the three-three stylemodern engineer training mode serves as a reference for the exploration of other professional training modes.

This paper studies the design of the low-frequency signal source for laboratory.Introduce the main hardware circuit schematics of the low-frequency signal source based on C8051F410 MCU,and analyze the software design ideas of exhaustive method to improve the synthesized signal frequency accuracy.After the experimental test,the low-frequency signal source's output signal frequency range can be adjusted in 0.1~100 Hz,peak-to-peak value can be adjusted in the range of 0 ~20 V,absolute frequency error is less than 0.1 Hz and the relative amplitude error is less than 0.5%,which can meet the needs of laboratory use.

This paper focuses on an applied research of automatic detection method for the viscose maturity degree in the chemical fiber production and introduces the hardware structure and software process of this automatic detection device for the maturity degree of viscose. Besides, through rigorous testing, contrasting, and analysis between this device and traditional test methods, the paper also puts forward a better way to improve the precision and result consistency in the process of the viscose maturity degree detection.

The smart charger for miner's cap lamp with safety monitor system is developed in this paper, which can recharge various kinds of Li-ion rechargeable batteries matching with it. The multiplexing technology is applied to the data exchange between the charger and the miner's cap lamp during charging process. The lamp's charge cycles, production date and operation logs can be read out and transmitted to the charging management computer via RS485 bus for the convenience of safety supervision from National Safety Production Supervision Department or miner's cap lamp manufacturer.