检索结果-内蒙古大学图书馆

IEEE Aerospace Conference

作者： Felicetti, Leonard Palmerini, Giovanni B. Sapienza Univ Roma DIAEE Via Salaria 851 I-00138 Rome Italy

ISBN: (纸本)9781479953806

The coordination of the attitude among different spacecraft belonging to a multiple platform system (formation or constellation) is a basic requirement in several missions, mainly the ones involving sensors like radars or optical interferometers. It is also an open topic in research, above all as it matches the characteristics of the current trend towards interoperability and federated systems. Different approaches are possible to define and chase such a coordinated attitude. The classic control strategy is the so-called leader-follower architecture, where all spacecraft depend on ("follow") the behavior of a single master. Alternatively, the behavioral approach involves a continuous re-selection of the desired target configuration which is computed on the basis of the behavior of all the platforms. A third possibility is to define a "virtual" architecture, especially suitable with respect to the mission requirements, which is not dependent on the current kinematic state of the platforms. The paper proposes a unified treatment of these concepts by using some fundamental definitions of the consensus dynamics and cooperative control. The convergence to the targeted configuration is addressed both analytically, by using Lyapunov stability criteria, and numerically, by means of numerical simulations. The attitude requirements and constraints are highlighted and a solution for the control algorithm - involving continuous actuators on each platform is developed. A comparative analysis of different optimal control strategies, the Linear Quadratic Regulation (LQR) and the State Dependent Riccati Equation (SDRE) - suitably modified to address the needs of coordination - is presented. The results show the general value of the proposed approach with respect to either linear or nonlinear models of the dynamics.

关键词： satellite constellations Formation flight Attitude target configurations computer algorithms Optical Interferometers Platform Spacecraft control strategy radar Nonlinear Models CONSTELLATIONS

来源：评论

学校读者我要写书评

暂无评论

Seeing into hearts and minds Part 2. 'Big data', algorithms, and computational counterinsurgency

引用

ANTHROPOLOGY TODAY 2015年第4期31卷 13-18页

作者： Gonzalez, Roberto J. San Jose State Univ Anthropol San Jose CA 95192 USA

In this second of his two-part article, the author analyzes the rise of ‘predictive policing’ and its Pentagon connections, reviews two programmes, and poses these in the context of scientists'... 详细信息

关键词： BIG data COUNTERINSURGENCY computer algorithms ARTIFICIAL intelligence

来源：评论

学校读者我要写书评

暂无评论

Low Complexity Room Thermal Models for Energy Optimization in Industrial Buildings 20

Low Complexity Room Thermal Models for Energy Optimization i...

引用

20th IEEE Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Nagy, Anetta Sauter, Thilo Danube Univ Krems Ctr Integrated Sensor Syst Viktor Kaplan Str 2 A-2700 Wr Neustadt Austria

ISBN: (纸本)9781467379298

The prime goal in automation systems is to increase productivity while at the same time save production costs. Nevertheless, in recent years there is increasing concern about the ecological footprint of production systems and a growing demand for energy optimization. Heating, ventilating and air conditioning (HVAC) systems in large industrial buildings consume a substantial amount of energy and typically run independently of the actual production processes. Integrating the two systems, however, can be beneficial in terms of overall energy optimization. This paper proposes a modular modelling of the building thermal load with the aim of connecting this model with the typical architecture of Manufacturing Execution Systems (MES). As the building automation system is distributed, the idea is to bind it with a set of generic cells that encapsulate a thermal model of the physical surrounding as well. With this approach the cell thermal load behaviour can be predicted for energy optimization. To allow implementation on the existing embedded devices and controllers with limited computational resources, a reduced complexity model is developed. As the model is to be used for model predictive control (MPC), also the first steps towards the development of the control algorithm are introduced and the benefits compared to traditional approaches are shown.

关键词： Industrial buildings energy capacity automation system Building automation systems computer algorithms High Voltage Alternating Current Systems Thermal loading Ecological footprint Energy sources Production Processes thermal model Production systems

来源：评论

学校读者我要写书评

暂无评论

Displacement-based Formation Tracking Control of Multi-agent with Size Scaling 5

Displacement-based Formation Tracking Control of Multi-agent...

引用

5th Australian Control Conference (AUCC)

作者： Wu, Z. Sun, J. Wang, X. Nanjing Univ Sci & Technol Sch Automat Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781467395526

In this paper, we propose a formation control algorithm for multi-agent systems to achieve prospected formation shape and track reference trajectory. We assume the description of formation and reference velocity is known to all agents. For second-order dynamics, we present a strategy that allows all agents to maneuver to desired scaled formation during tacking leader's movements. Finally, simulation results show that the proposed displacement-based formation tracking strategies are effective.

关键词： computer algorithms reference velocity tracking control Agents Multi-agent systems Scale formation tack Simulation results

来源：评论

学校读者我要写书评

暂无评论

A Distributed Bi-directional Hysteresis Control Algorithm for Server-to-Virtual Bus Differential Power Processing 16

A Distributed Bi-directional Hysteresis Control Algorithm fo...

引用

IEEE 16th Workshop on Control and Modeling for Power Electronics (COMPEL)

作者： Candan, Enver Shenoy, Pradeep S. Pilawa-Podgurski, Robert C. N. Univ Illinois Dept Elect & Comp Engn Urbana IL 61801 USA

ISBN: (纸本)9781467368476

This paper presents a control method for regulating serially connected server voltages. Following the discussion of the proposed control method, both simulations and an experimental study are performed for validation. A simulation model is used to optimize system parameters for maximizing the system-level power conversion efficiency. For the experimental study, a test-bed consisting of four 12 V servers and four dual active bridge converters is built and the control method is implemented on a digital controller. The experimental measurements show that the proposed control method achieves successful voltage regulation of serially connected servers and a system-level power conversion efficiency as high as 99.89%.

关键词： Control Methods power handling hysteresis control computer algorithms Servers Voltage regulation Power Conversion Efficiency system parameter Motor buses TWO-COMPONENT Simulation models

来源：评论

学校读者我要写书评

暂无评论

An Open-Source Architecture for Control and Coordination of a Swarm of Micro-Quadrotors

An Open-Source Architecture for Control and Coordination of ...

引用

International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Furci, M. Casadei, G. Naldi, R. Sanfelice, R. G. Marconi, L. Univ Bologna CASY DEI Bologna Italy UCSC Dept Comp Engn Santa Cruz CA USA

ISBN: (纸本)9781479960101

This work presents the design of an open-source control architecture specifically tailored to the rapid development and testing of control and coordination algorithms on micro quadrotors. The proposed design extends an existing open-source and open-hardware quadrotor project, i. e., the Crazyflie nano quadrotor, by adding the guidance, navigation and control layers required to accomplish autonomous flight. The control layer, in particular, is based on a cascade control algorithm able to globally stabilize the position and the attitude of the vehicle. The global property guaranteed by the algorithm allows the quadrotors to perform aggressive maneuvers. The guidance layer is designed to coordinate simultaneously multiple vehicles by generating suitable reference trajectories. Experiments demonstrate the effectiveness of the proposed design.

关键词： control layer dike swarms open source Guidance Navigation and Control Standing Orders test control coordination algorithm computer algorithms

来源：评论

学校读者我要写书评

暂无评论

The ANDIX Research OS - ARM TrustZone Meets Industrial Control Systems Security 13

The ANDIX Research OS - ARM TrustZone Meets Industrial Contr...

引用

13th IEEE International Conference on Industrial Informatics (INDIN)

作者： Fitzek, Andreas Achleitner, Florian Winter, Johannes Hein, Daniel Graz Univ Technol Inst Appl Informat Proc & Commun Inffeldgasse 16a A-8010 Graz Austria

ISBN: (纸本)9781479966493

Security by isolation is a longstanding, widely applied, and useful paradigm for achieving security goals such as data and code integrity, confidentiality, and availability. Security by isolation can be used to create Trusted Execution Environments. These environments provide specific security guarantees to the information processing taking place therein. In an Industrial Control System secure control setting using this approach allows, for example, protecting the integrity of a control algorithm against unauthorized modification and secure monitoring of the veracity of received inputs, even in the face of a subverted communication interface. Here, we introduce ANDIX OS, a security Operating System using the ARM TrustZone architecture to create a Trusted Execution Environment. The ARM TrustZone architecture is a set of security extensions for ARM processors based systems. It is widely in use in mobile phones today. We argue that ARM TrustZone is a technology relevant to the Industrial Control System security setting and that research of its applicability should take place now. To this end we freely provide ANDIX OS as open source for research and also present the results of a case study, where we have used ANDIX OS to solve a concrete problem from a smart maintenance for Industrial Control Systems context. We believe that security for Industrial Control Systems is a pertinent topic and that the use of ARM TrustZone as a security technology that comes almost free with a certain class of ARM based systems is worth studying in this context. Therefore, with ANDIX OS, we provide a suitable tool, and hope that actively encouraging researching the usefuleness and applicability of ARM TrustZone in an Industrial Control System (ICS) context will create more secure Industrial Control Systems in the future.

关键词： Industrial control systems security technology Security osmium Security Goals computer algorithms control systems open source

来源：评论

学校读者我要写书评

暂无评论

Decoupling Based Predictive Control Analysis of a Continuous Stirred Tank Reactor

Decoupling Based Predictive Control Analysis of a Continuous...

引用

International Conference on Industrial Instrumentation and Control

作者： Bansode, Prashant Jadhav, Sharad P. Ramrao Adik Inst Technol Dept Instrumentat Engn Navi Mumbai 400706 India

ISBN: (纸本)9781479971657

This paper presents a decoupling based model predictive control strategy for a process of continuous stirred tank reactor (CSTR). The MPC strategy when used along with decoupling compensation technique seem to suffer from increase in the computational complexity of the predictive control algorithm because of the additional dynamics of decoupling compensator. In this paper, we seek to reduce the computational burden on predictive control algorithm utilizing a simple decoupling technique for a process with loop interactions. A CSTR MIMO process is a benchmark problem for studying loop interactions. We compensate for loop interactions by directly modifying the plant model without changing its response characteristics provided plant and model mismatch is at minimum. The proposed strategy is compared for its simplicity with multi-variable decoupling control strategies with application to MPC in process industry. Simulations show that proposed technique efficiently reduces loop interactions in CSTR process.

关键词： Continuously stirred tank reactors Predictive control DECOUPLING computer algorithms Benchmark testing plant models Maximum Allowable Concentration Loops Contraceptive Coil STIRRED TANK REACTOR Agitation Tanks

来源：评论

学校读者我要写书评

暂无评论

Modelling and Control Design for Biped Robot Standing on Nonstationary Plane 20

Modelling and Control Design for Biped Robot Standing on Non...

引用

20th International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Bazylev, Dmitry Zimenko, Konstantin Margun, Alexey Ibraev, Denis Kremlev, Artem ITMO Univ Kronverkskiy Pr 49 St Petersburg 197101 Russia

ISBN: (纸本)9781479987016

Motion control of biped robots includes a variety of tasks, such as controlling a robot walking on a horizontal plane, climbing stairs, moving on uneven surfaces, etc. This article describes modeling and designed control system for a biped robot standing on nonstationary plane. The problem of stabilization of the balancing robot, assembled on the basis of a robotic kit Bioloid, is considered for the case, when trajectories of movable plane are assumed to be bounded and unknown in advance. In contrast to previous works [4], [8] the mathematical model of the system is completed with dynamical equations and an estimator of nonstationary plane angle and angular velocity is designed. Performance of the proposed control algorithm is confirmed by numerical simulation.

关键词： biped robot design control Modeling computer algorithms control systems plane Platanus hybrida Planing Motor Control ANGULAR VELOCITY trajectory advance numerical simulation Religious Missions Robot

来源：评论

学校读者我要写书评

暂无评论

Formation Control and Obstacle Avoidance for Multi-Agent Systems with Dynamic Topology

Formation Control and Obstacle Avoidance for Multi-Agent Sys...

引用

International Conference on Stability and Control Processes in Memory of V.I. Zubov (SCP)

作者： Morozova, Natalia S. Moscow MV Lomonosov State Univ Fac Computat Math & Cyberneth Moscow Russia

ISBN: (纸本)9781467376983

This paper presents the distributed formation control of a multi-agent systems with first-and second-order dynamics. The proposed control algorithms are based on the virtual leaders approach. The modifications of the base controls which ensures that agents avoid collisions and obstacles are considered in this paper. Specific rules that allow each agent to calculate the virtual leaders' position and the priority of each leader are suggested. The formation topology is chosen by the agents dynamically depending on the number of neighbouring agents, only local information is used by the agents. Obstacle avoidance is implemented with the help of potential repulsive function. Based on the developed discrete-time algorithm, solution for maintaining formation and avoiding collisions and obstacles while moving towards the target point, is proposed. Simulation results are presented, indicating capabilities of the algorithms.

关键词： Multi-agent systems Obstacle avoidance Agents Collision avoidance topology computer algorithms Collisions Leaders

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：