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2010 42nd Southeastern Symposium on System Theory (SSST)最新文献

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Fault tolerant cellular array design for nanoscale technologies 纳米技术的容错蜂窝阵列设计
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442822
D. Hoe
A cellular array architecture suitable for implementing fault-tolerant logic on nanoscale fabrics is described in this paper. A simple logic cell that is optimized for arithmetic logic functions allows efficient implementation of signal processing functions. Compared to the typical Look-up Table (LUT) approach used in FPGAs, the proposed logic block has decreased flexibility in terms of reconfigurability. However, the simpler structure and reduced number of configuration bits results in improved fault tolerant capability. Such a design tradeoff is suitable for nanotechnology implementations where there are a massive number of devices but also increased susceptibility to transient and permanent faults. A hierarchical approach to clustering the cells provides for an optimum number of spare cells to be distributed throughout the array, allowing for efficient self-healing capability.
本文描述了一种适用于在纳米级结构上实现容错逻辑的蜂窝阵列结构。一个简单的逻辑单元,是优化的算术逻辑功能,允许有效地实现信号处理功能。与fpga中使用的典型查找表(LUT)方法相比,所提出的逻辑块在可重构性方面的灵活性降低了。然而,更简单的结构和更少的配置位可以提高容错能力。这种设计折衷适用于纳米技术的实现,其中存在大量的器件,但也增加了对瞬态和永久故障的敏感性。集群单元的分层方法提供了分布在整个阵列中的最佳备用单元数量,从而允许有效的自修复能力。
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引用次数: 0
Quaternion based computed-torque and feed-forward tracking controllers for a space robot 基于四元数的空间机器人计算力矩前馈跟踪控制器
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442828
D. R. Isenberg, Y. Kakad
This paper presents both a quaternion based computed-torque trajectory tracking controller and a feed-forward trajectory tracking controller for a two-link space robot. First, the general form of the dynamical equations for a space robot modeled with quaternions is presented. The computed-torque controller is then presented and the stability of the resulting closed-loop system is analyzed via the second method of Lyapunov. This is followed by a discussion of the feed-forward controller. Tracking simulations are then presented and analyzed.
提出了一种基于四元数的计算转矩轨迹跟踪控制器和一种前馈轨迹跟踪控制器。首先,给出了四元数空间机器人动力学方程的一般形式。然后给出了计算转矩控制器,并利用李亚普诺夫第二方法分析了闭环系统的稳定性。接下来是对前馈控制器的讨论。然后给出了跟踪仿真并进行了分析。
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引用次数: 3
Smart power grids 智能电网
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442844
Gopalakrishnan Iyer, P. Agrawal
This paper aims at reviewing existing communication structure for the power grids, discusses the emerging smart grid initiatives and analyzes the cyber security threats to such smart grid systems. The 21st century world is more dependent on electrical power than ever. This dependency will increase manifold in the near future with more systems being computerized and a plethora of new electronic devices emerging for household, commercial and industrial applications. In such a scenario, the availability of secure, reliable and efficient power is crucial to sustaining current development and economic growth trends. With existing systems, power grids are not stable enough and can result in cascading failures.
本文旨在回顾现有的电网通信结构,讨论新兴的智能电网倡议,并分析智能电网系统面临的网络安全威胁。21世纪的世界比以往任何时候都更加依赖电力。在不久的将来,随着越来越多的系统被计算机化,以及大量用于家庭、商业和工业应用的新型电子设备的出现,这种依赖将会成倍增加。在这种情况下,安全、可靠和高效的电力供应对于维持当前的发展和经济增长趋势至关重要。在现有的系统中,电网不够稳定,可能导致级联故障。
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引用次数: 30
A comparative study of nonlinear filters for target tracking in mixed coordinates 混合坐标系下非线性滤波器目标跟踪的比较研究
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442834
Jaipal R. Katkuri, V. Jilkov, X. Li
The measurement model nonlinearity is a major challenge in target tracking. This paper presents a comparative performance study of seven nonlinear filters in handling the measurement model nonlinearity. They are: the extended Kalman filter, the unscented filter, the second order divided-differences filter, the Gauss-Hermite quadrature filter, the two-step Kalman filter, the Gaussian particle filter, and the linear minimum mean-square error tracking filter with polar measurements. Comprehensive performance evaluation and comparison of all of the above mainstream nonlinear filters over the same tracking scenarios are conducted via Monte Carlo simulation. The results can facilitate the choice and design of nonlinear tracking filters in mixed coordinates.
测量模型的非线性是目标跟踪中的一大难题。本文对7种非线性滤波器处理测量模型非线性的性能进行了比较研究。它们是:扩展卡尔曼滤波器、无气味滤波器、二阶差分滤波器、高斯-埃尔米特正交滤波器、两步卡尔曼滤波器、高斯粒子滤波器和线性最小均方误差跟踪滤波器。通过蒙特卡洛仿真对上述几种主流非线性滤波器在相同跟踪场景下的综合性能进行了评价和比较。研究结果可为混合坐标下非线性跟踪滤波器的选择和设计提供参考。
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引用次数: 13
Evaluation of a software configurable digital controller for the permanent magnet synchronous motor using field-oriented control 面向磁场控制的永磁同步电机软件可配置数字控制器的评价
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442814
Shiyoung Lee, B. Song, Tae-Hyun Won
This paper presents a software-defined digital controller for the permanent magnet brushless dc motor using field-oriented control (FOC). The proposed controller that improves the system performance in low torque ripple, and high efficiency is introduced and discussed in detail. The proposed FOC controller is implemented with a MC73110 motor control chip for experimental verification under 400W and 9,160rpm. The experimental motor waveforms and torque ripples with different commutation methods are investigated.
提出了一种基于场定向控制的永磁无刷直流电动机软件定义数字控制器。介绍并详细讨论了该控制器在低转矩脉动和高效率下提高系统性能。提出的FOC控制器采用MC73110电机控制芯片实现,在400W和9160rpm下进行了实验验证。研究了不同换相方式下电机的实验波形和转矩脉动。
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引用次数: 9
Design of power controller for hybrid vehicle 混合动力汽车动力控制器设计
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442847
H. Chin, A. A. Jafari
In this paper a new solution for the design of a control system of a hybrid vehicle is presented using game model approaches. Hybrid vehicles combined the benefits of a gasoline engine and an electric motor, which can be utilized in parallel through a mechanical transmission. Players are considered to be the electric motor and the gasoline engine. Payoff matrices of the bimatrix game are calculated by a power controller of the hybrid vehicle. The Lemke-Howson algorithm used to compute a Nash equilibrium point which is a pair of strategies for both players. The solution concept is to integrate torque for satisfying the driver pedal motion. The ratio of the power contribution between the gasoline engine and electric motor is the key point for efficient driving, whilst satisfying power demands. The main contribution of this paper is the development of a power controller which improves fuel economy and reduces charging cycles thus minimizing emissions.
本文提出了一种利用博弈模型方法设计混合动力汽车控制系统的新方法。混合动力汽车结合了汽油发动机和电动机的优点,它们可以通过机械传动并联使用。玩家被认为是电动马达和汽油发动机。利用混合动力汽车的功率控制器计算双矩阵博弈的收益矩阵。Lemke-Howson算法用于计算纳什均衡点,这是两个玩家的一对策略。解决的思路是整合扭矩以满足驾驶员踏板运动。在满足动力需求的同时,汽油机与电动机之间的功率贡献比是实现高效行驶的关键。本文的主要贡献是开发了一种功率控制器,它可以提高燃油经济性,减少充电周期,从而最大限度地减少排放。
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引用次数: 2
A multi-gain sliding mode based controller for the pitch angle control of a civil aircraft 基于多增益滑模的民用飞机俯仰角控制器
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442854
Mahikshit Polas, A. Fekih
A multi-gain sliding mode based controller for the pitch angle control of a civil aircraft is presented in this paper. The proposed controller is based on a novel concept of the sliding mode controllers in which multiple gains are being used to control the pitch angle of an aircraft and make it insensitive to parameter variations while reducing the chattering and guaranteeing the stability of the closed loop system. The proposed approach was implemented on a Delilah aircraft model to control the pitch angle under faulty conditions. Performance comparison between the traditional one gain SMC and the proposed multi-gains SMC are discussed.
提出了一种基于多增益滑模的民用飞机俯仰角控制控制器。该控制器基于一种新颖的滑模控制器概念,利用多增益控制飞机的俯仰角,使其对参数变化不敏感,同时减少抖振,保证闭环系统的稳定性。在一架大丽拉飞机模型上实现了故障条件下的俯仰角控制。讨论了传统单增益SMC和多增益SMC的性能比较。
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引用次数: 12
Study of reactive power/voltage sensitivities in interconnected power system networks 互联电网无功电压敏感性研究
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442842
Jaianand Jayaraman, A. Sekar
The strong coupling between bus voltages and reactive power injections has been widely used in steady state power flow algorithms. In the Newton-Raphson formulation the Jacobian matrix represents small-signal sensitivities relating real and reactive power injections to bus phase angles and voltage magnitudes respectively [1]. Decoupled approaches neglect real power-voltage and reactive power-phase angle relationships. While running the power flow analysis, the generator busses, where the real power injection and voltage magnitude are specified a priori, are changed to load busses with the voltage specification dropped if reactive power limits are violated. The papers describing optimal reactive power scheduling methods follow a similar procedure for evaluating appropriate generator reactive power levels [2]. Direct relationships between bus voltage and reactive power injection limits leading to useful sensitivities are derived in this paper using a line-voltage-drop model. Additional relationships between bus injection and line reactive flows become available in this approach. The paper presents detailed derivation of the new relationships, and applies the procedure to a typical power system network. The results illustrate the practical usefulness of the new approach in determining the limits on reactive power injection for a given bus voltage in generator busses. The conclusions outline future application of the approach for developing new reactive power optimization algorithms.
母线电压与无功功率注入之间的强耦合已广泛应用于稳态潮流算法中。在牛顿-拉夫森公式中,雅可比矩阵分别表示实功率和无功功率注入对母线相角和电压幅值的小信号灵敏度[1]。解耦方法忽略了实际功率-电压和无功功率-相角关系。在运行潮流分析时,如果违反无功限制,则将预先指定实际功率注入和电压量级的发电母线更改为负载母线,并降低电压规格。描述最优无功调度方法的论文遵循类似的程序来评估适当的发电机无功功率水平[2]。本文利用线路电压降模型推导了母线电压和无功功率注入限制之间的直接关系,从而得出了有用的灵敏度。在这种方法中,总线注入和线路反应流之间的其他关系变得可用。本文详细推导了这些新关系,并将其应用到一个典型的电网中。结果表明,该方法在确定给定母线电压下发电机母线无功功率注入限值方面具有实用价值。结论概述了该方法在开发新的无功优化算法方面的未来应用。
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引用次数: 8
Efficient design of SCADA systems using minimum spanning trees and the NFR Framework 基于最小生成树和NFR框架的SCADA系统高效设计
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442806
Haranath Yakkali, N. Subramanian
Supervisory Control and Data Acquisition (SCADA) systems are being increasingly used to monitor and control critical infrastructures ranging from computer networks to manufacturing, and proper design of SCADA systems is an important issue for developers of SCADA systems and their users. Current practice seems to center around purchasing a best-of-breed solution and configuring it to meet the expected system goals. In this paper we propose an efficient design approach based on minimum spanning trees and the NFR Framework(NFR standing for Non-Functional Requirements) wherein SCADA designs are captured in spanning trees and minimum spanning trees indicate the optimally weighted designs, and the most suitable among these weighted designs is chosen by employing the NFR Framework, which is a goal-oriented framework for analyzing competing alternatives and choosing the best one based on the goals for the SCADA system. The design algorithm is verified by applying it to a case study.
监控和数据采集(SCADA)系统越来越多地用于监视和控制从计算机网络到制造业的关键基础设施,而SCADA系统的正确设计对于SCADA系统的开发人员及其用户来说是一个重要的问题。当前的实践似乎围绕着购买最佳的解决方案并对其进行配置以满足预期的系统目标。在本文中,我们提出了一种基于最小生成树和NFR框架(NFR代表非功能需求)的有效设计方法,其中SCADA设计被捕获在生成树中,最小生成树表示最佳加权设计,并通过使用NFR框架选择这些加权设计中最合适的设计。它是一个以目标为导向的框架,用于分析竞争方案,并根据SCADA系统的目标选择最佳方案。通过实例验证了设计算法的有效性。
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引用次数: 1
Safeguarding cooperation in Synergy MAC 维护Synergy MAC的合作
Pub Date : 2010-03-07 DOI: 10.1109/SSST.2010.5442849
S. Kulkarni, P. Agrawal
Cooperative communication is a novel, diversity-improving technique that holds great promise for the future of wireless networks. But in order to fully exploit this diversity realized at the physical layer, the idea of node cooperation needs to be extended to other layers of the protocol stack as well. Synergy MAC is one such extension to the MAC sublayer. As per this protocol, whenever a source intends to transmit some data to the destination, it solicits the support of its neighbors for the ensuing data transfer. When one a willing neighbor is identified as the relay, the source transmits its data to the destination by forwarding it via the enlisted relay. In doing this, not only does Synergy MAC realize spatial diversity but is also able to achieve faster transmission speeds. However, relay assisted two hop transmission in Synergy MAC gives rise to numerous concerns about its security. To address these concerns, appropriate security schemes need to be adapted to suit Synergy MAC. In this paper, we discuss various security issues introduced by cooperation in Synergy MAC and utilize two security schemes to address those problems. The techniques that are discussed here enable popular security schemes like WEP, WPA and WPA2 to successfully operate with Synergy MAC.
协作通信是一种新颖的、提高多样性的技术,对未来的无线网络有着巨大的希望。但是,为了充分利用在物理层实现的这种多样性,还需要将节点协作的思想扩展到协议栈的其他层。Synergy MAC就是MAC子层的一种扩展。根据该协议,每当一个源打算将一些数据传输到目的地时,它都会请求其邻居支持随后的数据传输。当一个有意愿的邻居被标识为中继时,源通过被征募的中继将其数据转发到目标。这样,Synergy MAC不仅实现了空间分集,而且能够实现更快的传输速度。但是,Synergy MAC中中继辅助的两跳传输引起了人们对其安全性的诸多担忧。为了解决这些问题,需要适当的安全方案来适应Synergy MAC。在本文中,我们讨论了Synergy MAC中合作引入的各种安全问题,并利用两种安全方案来解决这些问题。这里讨论的技术使流行的安全方案(如WEP、WPA和WPA2)能够成功地与Synergy MAC一起运行。
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引用次数: 4
期刊
2010 42nd Southeastern Symposium on System Theory (SSST)
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