丙烯腈装置的PID参数自动整定

在讨论丙烯腈生产装置的工艺原理的基础上，采用基于相关系数辨识法的AtLoop PID自动整定软件，优化整定了丙烯腈装置部分常规PID控制器参数，取得了较好的控制效果，为反应系统的在线优化提供了有利的条件，同时对产品质量的提高大有好处。     

基于ARM的自整定PID控制器的设计与实现

为了解决PID参数整定困难这个问题,用户可以根据需要自动整定,不再需要人为干预,用户只需发送一个命令来启动自整定过程。选用性能高、成本低、能耗小的ARM9处理器,根据PID参数自整定的原理和功能分析的要求进行系统硬件电路设计和系统软件设计,然后将软硬件集成并测试,使被控过程输出对其设定值的方差达到最小、控制系统更加稳定、控制效果更加精确。     

Automatic Flow-Control Adaptation for Enhancing Network Performance in Computational Grids

With the advent of computational Grids, networking performance over the wide-area network (WAN) has become a critical component in the Grid infrastructure. Unfortunately, many high-performance Grid applications only use a small fraction of their available bandwidth because operating systems and their associated protocol stacks are still tuned for yesterday's WAN speeds. As a result, network gurus undertake the tedious process of manually tuning system buffers to allow TCP flow control to scale to today's WAN Grid environments. And although recent research has shown how to set the size of these system buffers automatically at connection set-up, the buffer sizes are only appropriate at the beginning of the connection's lifetime. To address these problems, we describe an automated and lightweight technique called dynamic right-sizing that can improve throughput by as much as an order of magnitude while still abiding by TCP semantics.     

交流伺服系统转动惯量的辨识及负载转矩观测方法研究

交流伺服系统的工作性能受电机参数及负载扰动的影响很大，有必要对其转动惯量和负载转矩进行在线辨识和观测，并在辨识转动惯量时考虑负载扰动，并据此调整速度PI调节器参数以改善和提高系统的稳态和动态性能。本文提出一种转动惯量辨识的改进方法，用状态观测器对负载转矩进行实时观测，然后再利用模型参考自适应算法对系统的机械参数即系统转动惯量进行辨识。研究了自适应增益对辨识结果的影响。根据转动惯量的在线辨识量，利用最小峰值响应方法对系统速度PI调节器参数进行了自整定。仿真结果验证了算法的有效性。     

PID参数继电自整定的一种方法

介绍了ＰＩＤ调节器参数的继电自整定的基本原理。通过分析一阶惯住加纯滞后对象在继电特性作用下的输入输出持性，推导了计算对象特性参数的公式。利用这些公式进行辨识，从而整定ＰＩＤ参数。实验表明，这是一种行之有效的ＰＩＤ参数自整定方法。     

注塑机温度控制系统设计

采用16位单片机SPCE061A和自适应PID算法实现对注塑机的料桶温度控制,以达到精密注塑的温度要求。控制系统包含自动建模、PID参数自整定、分离积分PID控制、自适应控制等四部分。联机现场调试结果证明,该控制方案和算法是合理的、可行的。     

Receding Horizon Optimization Approach to PID Controller Parameters Auto-tuning

A novel supervised receding horizon optimal scheme is presented for discrete time systems in the process control.In the employing level,PID controller is used,while the receding horizon approach is applied to the optimized level.The considered problem is to optimize the employing level PID controller parameters through minimizing a generalized predictive control criterion.Compared with a fixed parameters PID controller,the proposed algorithm provides well performance over a range of operating condition.     

Auto-tuning of PID controller according to fractional-order reference model approximation for DC rotor control

This paper presents a stochastic, multi-parameters, divergence optimization method for the auto-tuning of proportional–integral–derivative (PID) controllers according to a fractional-order reference model. The study aimed to approximate the step response of the real closed-loop flight control system to the response of a theoretical reference model for a smoother and more precise flight control experience. The proposed heuristic optimization method can auto-tune a PID controller without a precise plant model. This is very advantageous when dealing with model and parameter uncertainties in real control application and practice. Experimental study confirms the reference model driven auto-tuning of the DC rotor prototype.     

Another version of the relay feedback experiment

Process dynamic behaviour is a key for designing any control scheme. A simple method to determine a point on the frequency characteristics of the plant is the closed loop relay experiment. This paper proposes a new version for this method, presenting its possible advantages, simulation and real time experimental results.     

Design of auto-tuning capacitive power transfer system for wireless power transfer

This paper presents the design of capacitive wireless power transfer systems based on a Class-E inverter approach. The main reason for adopting the Class-E inverter approach is because of its high efficiency, theoretically 100%. However, the operation of a Class-E inverter is highly sensitive to its circuit’s parameters. In a typical capacitive wireless power transfer application, the capacitive coupling distance between plates is subject to changes, and hence its power transfer efficiency is greatly affected if the Class-E inverter is properly tuned. This drawback motivates us to develop an auto frequency tuning algorithm for a Class-E inverter which maintains its power transfer efficiency in spite of the variations of capacitive coupling distances between plates and circuit’s parameters. Finally, simulation and experiment are carried out to verify the effectiveness of the auto frequency tuning algorithm.