Traction Control for Ride-by-Wire Sport Motorcycles: A Second-Order Sliding Mode Approach

This paper addresses the analysis and design of a safety-oriented traction control system for ride-by-wire sport motorcycles based on the Second-Order Sliding Mode methodology. The controller design is based on a nonlinear dynamical model of the rear wheel slip, and the modeling phase is validated against experimental data measured on an instrumented vehicle. To comply with practical applicability constraints, the position of the electronic throttle body is used as control variable and the effect of the actuator dynamics is thoroughly analyzed. After a discussion on the interplay between the controller parameters and the tracking performance, the final design effectiveness is assessed via Mechanical Simulation Corporation BikeSim, a full-fledged commercial multibody motorcycle model.      

主动网络中的分层组播拥塞控制策略

为了满足在网络异构情况下根据不同客户端的网络状况保证Qos的组播需求,文章研究了在主动网络中的分层组播的方法,提出了根据主动包进行粗粒度的层加入和根据统计网络拥塞标志信息进行细粒度的离开的拥塞处理的组播实现策略.仿真结果表明,该策略能对网络环境的变化进行多点传输的分层的做出动态适应性调节,同时在网络中实现了与TCP的友好.该算法可以满足多媒体组播在网络异构情况下的拥塞处理.     

Data Congestion Control Using Offloading in IoT Network

Internet of Things (IoT) is being used by a large number of applications and transmitting huge amounts of data. IPv6 routing protocol for low power and lossy networks (RPL) is being standardized for routing in IoT networks. However, it is difficult to handle such huge transmission as it is initially designed for Low power and lossy networks. In this paper, we present the mechanism for the reduction of overhead from the congested parent node by offloading its partial load. For offloading the packet, a suitable neighbor is selected based on its status of energy, buffer, link quality, number of child nodes, and distance. This approach focuses on the enhancement of RPL by including the mechanism for congestion control. The approach reduces the delay and packet loss rate while avoiding congestion in a suitable manner. The proposed approach is beneficial in terms of throughput and packet receiving ratio as compared to the comparative approaches.

     

Frequency-Shaped Sliding Mode Control Using Output Sampled Measurements

In this paper, a method is presented for frequency-shaped sliding mode control using output feedback. A compensator is introduced in the sliding surface to attenuate the certain frequency component of the sliding mode dynamics. The output is measured at a faster rate than the control input to estimate the states of the system. The proposed output feedback frequency-shaped sliding mode controller is designed for the vibration suppression of intelligent structure. The simulation and experimental results show the efficacy of the method.     

Adaptive Iterative Learning Control for a Class of Uncertain Nonlinear Systems with Second-Order Sliding Mode Technique

This paper addresses the problem of robust adaptive iterative learning control for a chain of uncertain integral nonlinear systems, whose aim is to stabilize the tracking error of the system and improve convergence speed in the presence of uncertainties. In response to unknown bounded disturbances, a continuous second-order sliding mode adaptive iterative learning control scheme is proposed, in which an integral term is to attenuate the effects of the disturbances and achieve fast convergence performance. By designing a suitable controller and composite energy function, it is proved that the tracking error along iterative learning horizon will converge to a small neighborhood of zero. Numerical examples are provided to validate the efficacy of the proposed method.     

Analysis of Packet Network Congestion Control Using Sparse Matrix Algorithms

The purpose of this study is twofold. First the study illustrates the utility of applying sparse matrix methods to packet network models. Secondly, these methods are used to give new results about the control of store and forward congestion in packet networks. Store and forward congestion (node to node blocking) reduces the effective traffic carrying capacity of the network by unnecessarily idling network resources. This study shows how store and forward congestion can be controlled by a combination of buffer reservation and processor capacity allocation. The scheme presented is analyzed using a Markovian state-space model of two coupled packet switches. The model contains more detail than previous analytic models. It is therefore solved using numerical sparse matrix methods. The results show that the combination of buffer reservation and processor capacity allocation gives strictly nondecreasing network output as a function of increasing network input load, i.e., undesirable store and forward congestion effects are eliminated.     

高速网络环境中的TCP拥塞控制算法

现有的TCP Reno在高速网络环境下存在的带宽利用率等问题,从而引出了诸如HS—TCP,S—TCP和Fast—TCP等改进的TCP拥塞控制算法。本文简单介绍三种算法,对比分析了它们存在的问题和造成的原因,并提出了可能的研究方向和目前最新的改进算法。     

高速网络环境中的TCP拥塞控制算法

现有的TVP Reno在高速网络环境下存在的带宽利用率等问题,从而引出了诸如HD-TCP,D-TCP和Fast-TCP等改进的TCP拥塞控制算法.本文简单介绍三种算法,对比分析了它们存在的问题和造成的原因,并提出了可能的研究方向和目前最新的改进算法.     

分组无线网的拥塞控制技术

网络拥塞在分组无线网（ＰＲＮＥＴ）中是一个潜在的问题，为减轻或避免拥塞的摧毁效应，在ＰＲＮＥＴ中，有必要对拥塞进行控制。本文首先分析了往的拥控制中存在的问题，然后介绍了两种新的相互合作的拥塞控制技术－建立长期最大－最小端到流率的端到拥塞控制算法以及链路层拥塞避免算法，最一对这种机制的性能进行了相应的分析与评价。     

ATM网络的拥塞控制

ＡＴＭ网络的拥塞控制是ＡＴＭ网络技术一个重要的组成部分，由于ＡＴＭ网络高速的传输和交换，使得传统的网络拥塞控制方法不再适合于ＡＴＭ网络。本文对ＡＴＭ网络拥塞控制的基本方法进行了分析，并就存在的一些问题和解决途径进行了讨论。     

滑模控制永磁同步电动机的矢量控制技术

本文为了解决传统PI控制器鲁棒性差、系统抗扰能力弱和动态响应的问题,针对永磁同步电动机矢量控制系统,设计了一阶滑模变结构速度环控制器。分析滑模转速控制器抖振产生的原因和影响,利用饱和函数设计了边界层滑模控制器,削弱了滑模控制器的抖振。搭建了在Matlab/Simulink环境下的仿真模型,并进行了仿真分析。仿真结果表明该控制策略减小了系统的超调与振荡,使系统具有较好的鲁棒性和动、静态性能。     

功率因数校正系统的滑模控制

本文分析了在功率因数校正变换器中输出动态响应慢的问题，提出了用滑模控制方法实现稳态输入电为和输出电压动态性能之间折和协调的思想，推导了有关滑模控制的方程和系数发制关系，给出了控制实现的原理图，最后，实验结果验证了这一思想。     

BUCK变换器的模糊滑模积分控制

由于BUCK变换器的非线性,多用模糊滑模对其控制,但传统模糊滑模控制器输出存在稳态误差,且滑模控制结构切换过快造成开关管损耗增加。基于此,在模糊滑模控制的基础上引入积分环节。滑模控制器输出控制率,模糊控制器柔化滑模控制器输出,削弱系统抖振;积分环节对模糊控制器输出和滑模控制器切换项输出之差进行积分,减小模糊滑模控制器输出的稳态误差,并使开关频率固定化,降低开关管损耗。仿真及实验结果表明,引入积分环节的模糊滑模控制器稳态误差降低,开关管开关频率固定,系统损耗得到有效降低。     

DSP Based Sliding Mode Control for Photovoltaic System

Wireless Personal Communications - In this paper a new and simple DSP-based Sliding Mode Controller (SMC) has been developed for the Buck-Boost converter to get regulated DC power supply from solar...     

基于滤波器的机器人滑模控制

变结构控制系统是一类特殊的非线性控制系统,滑模控制就是其中的一种控制策略。滑模控制对系统参数及扰动的变化反应迟钝,具有很强的鲁棒性,该控制方法特别适合机器人系统的控制。抖振是滑模变结构控制中不容回避的问题。文中采用了后滤波器用于消除对象输出的噪声干扰,从仿真结果看,有效削弱了单纯滑模变结构控制系统的抖振。     

FCA-ItswTCM:区分服务中一种公平的拥塞自适应标记算法

 本文提出了一种新的滑动窗口标记算法——公平的拥塞自适应标记算法(FCA-ItswTCM).算法近似识别TCP流和UDP流,适度区分标记,规避拥塞控制机制对公平性的影响;细粒度描述拥塞,预测拥塞,以此自适应调节各流注入黄包比例,兼顾网络拥塞状态对公平性的影响.仿真实验表明,与其他几种滑动窗口标记算法相比,FCA-ItswTCM对确保TCP流和UDP流带宽共享的公平性、提高资源利用率及系统稳定性有较好的效果.     

网络拥塞与流量控制

文章主要研究了TCP/IP中主要采用的拥塞控制算法,讨论了目前TCP/IP中常用的AIMD算法的稳定性、收敛性、公平性,及其约束条件,并进一步将MAIMD算法和AIMD算法进行了比较。最后仿真了两用户不同RTT时的状态轨迹和公平指数轨迹。     

Microprocessor-Based Decoupled Control of Manipulator Using Modified Model-Following Method with Sliding Mode

A methodology of discontinuous feedback and continuous feedforward control is developed to achieve accurate decoupled tracking in a class of nonlinear, time varying systems in the presence of disturbances, parameter variations and nonlinear dynamic interactions. The method is based on an improved variable structure control with a sliding mode.     

面向M2M通信的移动网络拥塞控制

研究表明,M2M通信具有潜在的市场前景,海量终端接入使得移动网络面临着网络拥塞的问题。本文首先分析了移动网络拥塞产生的场景,在此基础上按照核心网络、终端和无线网络分别描述了不同层面的解决方案。其中核心网络的解决方案包括拥塞识别、接入拒绝方法;终端设置低优先级说明了低优先级是与应用相关的;无线网络的解决方案包括拥塞控制触...