Showing papers on "Autonomous system (mathematics) published in 2012"

Four-wing hyperchaotic attractor generated from a new 4D system with one equilibrium and its fractional-order form

Abstract: In this paper, a new simple 4D smooth autonomous system is proposed, which illustrates two interesting rare phenomena: first, this system can generate a four-wing hyperchaotic and a four-wing chaotic attractor and second, this generation occurs under condition that the system has only one equilibrium point at the origin. The dynamic analysis approach in the paper involves time series, phase portraits, Lyapunov exponents, bifurcation diagram, and Poincare maps, to investigate some basic dynamical behaviors of the proposed 4D system. The physical existence of the four-wing hyperchaotic attractor is verified by an electronic circuit. Finally, it is shown that the fractional-order form of the system can also generate a chaotic four-wing attractor.

Analysis of a new three-dimensional chaotic system

Abstract: In this paper, a new three-dimensional autonomous chaotic system is presented. There are three control parameters and three different nonlinear terms in the governed equations. Basic dynamic properties of the new system are investigated via theoretical analysis and numerical simulation. The nonlinear characteristic of the new three-dimensional autonomous system versus the control parameters is illustrated by bifurcation diagram, Lyapunov-exponent spectrum, phase portraits, etc.

An Autonomous System for Multitrack Stereo Pan Positioning

Abstract: A real-time system for automating stereo panning positions for a multi-track mix is presented. Real-time feature extraction of loudness and frequency content, constrained rules and cross-adaptive processing are used to emulate the decisions of a sound engineer, and pan positions are updated continuously to provide spectral and spatial balance with changes in the active tracks. As such, the system is designed to be highly versatile and suitable for a wide number of applications, including both live sound and post-production. A real-time, multi-track C++ VST plug-in version has been developed. A detailed evaluation of the system is given, where formal listening tests compare the system against professional mixes from a variety of genres.

Innovative Digital Self-Powered Autonomous System for Multimodal Vibration Suppression

Abstract: A novel invention, a digital self-powered autonomous system, is proposed to achieve sophisticated vibration suppression dealing with multimodal vibrations. This vibration suppressor can be used ubiquitously at any site because it does not require an external power supply or a central control authority. The digital approach enables the system to be programmed, and thus, it affords some versatility with regard to control schemes. The proposed system is a vast improvement over conventional analog-autonomous systems whose fine-tuning is very difficult. The digital unit can be implemented in multi-input/multi-output systems to suppress complicated structural vibrations, such as multimodal vibrations. This paper provides an analytical discussion on the energy-harvesting effect on suppression performance in terms of the power balance andflow.Experiments demonstrate that the vibrationmagnitude reduces dramatically by as much as 79.7% under force excitation, although the self-powered control unit is used.

Optimization of a PV-wind-diesel system using a hybrid genetic algorithm

Abstract: Sizing the physical components, choosing proper brands, setting the optimal operation parameters, and the computation time are crucial issues when designing a diesel-hybrid renewable energy system. In this paper, a variant of one of the conventional methods used for designing and configuring these systems is proposed. This variant employs a hybrid genetic algorithm resulting in a time-efficient searching method. This method was applied in the design of an autonomous system that supplies two of the different kinds of loads typically encountered in Japan. The predicted costs were feasible and encouraging for more investment in this field of power.

Autonomous coordination of agents

Abstract: A method of controlling movement of an agent operating within an autonomous system includes determining, using a processing device associated with the agent, a highest attraction point for the agent on a line of optimal transmission between a detected event within an area of surveillance by the autonomous system and a base station within the autonomous system, and calculating an attraction force for the agent, based on the line of optimal transmission and location of the detected event; determining proximity of the agent to one or more additional agents operating within the autonomous system, and calculating a repulsion force for the agent so as to maintain a minimum separating distance between the agent and the one or more additional agents; calculating a resultant force for the agent based on the attraction force and the repulsion force; and changing a direction of the agent based on the resultant force.

Leader-following rendezvous with connectivity preservation of single-integrator multi-agent systems

Abstract: This paper studies the problem of leader-following rendezvous with connectivity preservation for a linear multi-agent system where the leader system is a linear autonomous system and the follower system is a multiple single-integrator system. We propose a distributed state feedback control protocol that is able to maintain the connectivity of the system and, at the same time, achieve asymptotic tracking of all followers to the output of the leader system.

Advanced agriculture system

Abstract: This article addresses the advanced system which improves agriculture processes like cultivation on ploughed land, based on robotic platform. We have developed a robotic vehicle having four wheels and steered by DC motor. The advanced autonomous system architecture gives us the opportunity to develop a complete new range of agricultural equipment based on small smart machines. The machine will cultivate the farm by considering particular rows and specific column at fixed distance depending on crop. The obstacle detection problem will also be considered, sensed by infrared sensor. The whole algorithm, calculation, processing, monitoring are designed with motors & sensor interfaced with microcontroller. The result obtained through example activation unit is also presented. The dc motor simulation with feedforward and feedback technique shows precise output. With the help of two examples, a DC motor and a magnetic levitation system, the use of MATLAB and Simulink for modeling, analysis and control is designed.

Time-averaged coarse variables for multi-scale dynamics

Abstract: Given an autonomous system of Ordinary Differential Equations without an a priori split into slow and fast components, we define a strategy for producing a large class of ‘slow’ variables (constants of fast motion) in a precise sense. The equation of evolution of any such slow variable is deduced. The strategy is to rewrite our system on an infinite dimensional “history” Hilbert space X and define our coarse observation as a functional on X.

Complete damping of a linear autonomous differential-difference system by a controller of the same type

Abstract: For a spectrally controllable linear autonomous system of retarded type with commensurable delays, we construct a dynamic state feedback ensuring a complete damping of the original system. The closed-loop system is of retarded type as well. The results are illustrated by an example.

Exploring the role of autonomous system behavior in lighting control

Abstract: Modern distributed lighting systems require advanced control systems because of the large amount of light sources and manipulable parameters. In this position paper we explore the unknown dimensions that can be used to describe control from full-user to full-system control. We believe a hybrid between the two will be most desirable. Combined with explicit user interaction, autonomous system behavior will create intelligent systems, able to adapt to users and contexts. This provides interesting opportunities for improved user experience as well as functional added value, for instance in energy saving or easy commissioning of light infrastructure. Based on different types of interactions, different levels of interaction-initiative and different interaction layers, a useful mapping of such hybrid control can be made. In our lighting living labs, we have implemented different controls in order to evaluate them on the basis of user experience.

Hybrid energy harvesting for autonomous sensors in building automation

Abstract: For researches on energy harvesting in building automation two independent power sources have been examined. Therefor long term power profiles have been analysed, which show the available energy per transducer over time. These profiles have been investigated according to their ability to supply an energy autonomous system and to improve the availability and reliability of operation. To reduce the failing time of a sensor system by using two independent sources within a hybrid energy harvesting supply, is one of the general aims for this contribution. An energy management circuit has been developed and compared to the state of art solution of combining different energy sources. The additional losses of this method have been simulated. This contribution tends on a method to improve the reliability of an energy autonomous system using two different and independent energy sources and an optimized combination of both within an adapted energy management strategy.

Vehicle collision avoidance algorithm based on state estimation in the roundabout

Abstract: The collision avoidance algorithm based on state estimation is developed by introducing the concept of force field and warning function in the roundabout. The desired trajectory is an array stored in memory, the choice of target point array determines the vehicle trajectory. According to the predictive value and measurement of positioning system, the autonomous vehicle implements path following algorithm by estimating the states. A rectangle on the position plane is used to describe conflict area, and the multi-vehicle autonomous system model is established. By selecting the safety operation mode, vehicles can be away from the conflict area and pass the merging points by implementing collision avoidance algorithm.

Design and Experiments of small DDoS Defense System using Traffic Deflecting in Autonomous System.

Abstract: DDoS (Distributed Denial of Service) attacks are a serious threat to the legitimate use of the Internet. Many defense methods against DDoS attacks have been suggested. However, the deployment of defense systems becomes an important issue. A previous work, called the Shield [3], brought up the deployment problem and handles the issue with traffic trapping and traffic black-holing techniques. In this paper, a framework for redirection and filtering that works within an AS (Autonomous System) is proposed, while the Shield works outside an AS. This system is designed for protecting legitimate resources from DDoS attacks and for dispersing traffics in small-scale networks such as an AS. In addition, we design the structure that can be deployed and work without changing pervious routers. We also show the optimal number of deployed systems and deployment location through simulation.

Maximum delay computation for interdomain path selection

Abstract: One important problem when deploying interdomain path selection is advertising metrics that hold for a long period of time. In this paper we propose a method to aid interdomain path selection mechanisms in that sense. We present a means of computing a bound on the end-to-end delay of traversing a domain considering that the traffic varies within a given uncertainty set. This provides a robust and a verifiable quality of service value for traversing the autonomous system (AS), without revealing confidential information. Consequently, the bound can be safely conceived as a metric to be announced by each AS in the process of interdomain path selection. We show how the maximum delay value is obtained for an interdomain bandwidth demand and we propose an exact method and a numerical approximation method for computing it, neither of which rely on a complex monitoring infrastructure. Simulations with real data that illustrate the problem and validate our results are also presented. Copyright © 2011 John Wiley & Sons, Ltd. (This work studies the worst case of the end-to-end delay of traversing an Autonomous System when Traffic Matrix is uncertain. An exact method for computing the bound and a numerical approximation are presented. Simulation studies are performed with real networks, showing that delay can suddenly increase. The method provides an end-to-end metric that holds for a long period of time and can thus be used by interdomain path selection mechanisms with quality of service constraints.)

Modeling concept for the infrastructure of autonomous logistic processes

Abstract: Autonomous control can increase the flexibility and the robustness of logistic systems by enabling decision making and execution about the system behavior at the system elements themselves. Therefore, logistic systems require specific infrastructure components. This paper presents terms and drivers which are relevant for the configuration of the infrastructure of autonomous logistic control systems. First, it introduces the terms autonomous control, infrastructure, configuration, and logistic system in the application area of production logistics. Second, a control system's macro and micro architecture are discussed. Third, the paper suggests a conceptual model for modeling infrastructures in general.

The autonomous system derived from Van der Pol-Mathieu equation

Abstract: This work is devoted to the autonomous system derived from Van der Pol-Mathieu equation which was applied to the study the dynamics of dusty plasmas. In this work we shall investigate mathematically this autonomous system and shall find how large region of the plane will be attracted to the equilibrium point.

Method and equipment for detecting IP address conflict in autonomous system

Abstract: The invention provides a method and equipment for detecting IP address conflict in an autonomous system. The method comprises the following steps: equipment in the autonomous system builds a message carrying the interface IP address information of the equipment when a novel interface enables the interior gateway protocol; and the message is sent to all the equipment in the autonomous system, the message enables the equipment in the autonomous system, which receives the message, to generate the message by other equipment except for the equipment which receives the message, and an indication indicating IP address conflict in the autonomous system is given out when the IP address information in the message and the interface IP address information of the equipment are the same. By adopting the invention, the IP address conflict can be detected in the autonomous system, so as to improve the maintainability and the reliability of IP network.

Elliptic solutions in the H\'{e}non - Heiles model

Abstract: Equations of motion corresponding to the H\'{e}non - Heiles system are considered A method enabling one to find all elliptic solutions of an autonomous ordinary differential equation or a system of autonomous ordinary differential equations is described New families of elliptic solutions of a fourth--order equation related to the H\'{e}non - Heiles system are obtained A classification of elliptic solutions up to the sixth order inclusively is presented

Concept of a biologically inspired robust behaviour control system

Abstract: In safety-critical and in space applications, high demands are made on the reliability of the involved systems. As autonomy could increase both the efficiency and the reliability of such systems, a reliable autonomous system could be beneficial for several robotic scenarios. In this paper, the concept of a biologically inspired, robust behaviour control system is presented. The system includes components for prediction of actions to be executed and the evaluation of the action consequences. In its design process, particularly the occurence of unexpected situations was taken into account. The paper concludes with a presentation of preliminary simulation results and the evaluation setup that will be used in future tests to demonstrate the model properties.

Sell’s conjecture for non-autonomous dynamical systems

Abstract: This paper is dedicated to the study of the G. Sell’s conjecture for general non-autonomous dynamical systems. We give a positive answer for this conjecture and we apply this result to different classes of non-autonomous evolution equations: Ordinary Differential Equations, Functional Differential Equations and Semi-linear Parabolic Equations.

A New Method for Tectonic Conserved Quantity on Invariant Manifold of Autonomous System

Abstract: Reached the autonomous force system, indicate the concept of invariant manifold of autonomous system If the autonomous force system exists the (n-1) dimensional invariant manifold,then the system invariant manifold’s generating function can be calculated, farther, we can construct the system’s conserved quantity by these generating functions Last one illustrative example is given with the help of n-body

Coordination and Control for Multi-Quadrotor UAV Missions

Abstract: : This thesis is centered upon an optimal trajectory generation algorithm that allows real-time control for cooperation of multiple quadrotor vehicles for intelligence, surveillance, and reconnaissance missions with minimal user input. The algorithm is designed for an indoor environment where global positioning system data is unavailable or unreliable, forcing the vehicles to obtain position data using other sensors. This thesis specifies the lab setup and well as the control approach used. Data acquired from two experiments is included to demonstrate the effectiveness of the control approach. The control approach described within allows for a fully autonomous system with user input required only at the initiation of a mission. The algorithm blends trajectory planning, trajectory following, and multi-vehicle coordination to achieve the goal of autonomy. The focus of the thesis was on trajectory generation and multi-vehicle coordination, while leveraging existing trajectory following controller implementations. The trajectory generation is accomplished with a direct transcription of the optimization problem that leverages inverse dynamics and separates spatial and temporal planning. The vehicle motion is constrained, and simplifying multi-vehicle coordination assumptions allow for the efficient solution and execution of the problem.

A Chaotic Three Dimensional Non-Linear Autonomous System Beyond Lorenz Type Systems

Abstract: Some fundamental properties of a chaotic three-dimensional non-linear system of the Lorenz type systems were studied. The invariance, dissipation, bifurcation and the strange attractors were investigated and analyzed one 1-scroll, two 2-scroll and two 4-scroll attractors by adding control parameters to this system. The relationship and connecting function for the 2-scroll attractor of this system were also explored. DOI: http://dx.doi.org/10.3329/jbas.v36i2.12959 Journal of Bangladesh Academy of Sciences, Vol. 36, No. 2, 159-170, 2012

Method for announcing border connecting information of autonomous system and boundary nodes

Abstract: The invention discloses a method for announcing boundary connecting information of an autonomous system and boundary nodes. The method comprises the following steps that: the boundary nodes of the autonomous system establish and maintain the boundary connecting information of the autonomous system; the boundary connecting information is widely broadcasted in the autonomous system; and the nodes of the autonomous system receive the boundary connecting information. The method for the announcing the boundary connecting information of the autonomous system and the boundary nodes disclosed by the invention can adapt to the dynamic change of network topology, and dynamically announce the boundary connecting information of the autonomous system to the inside of the system in time, thereby realizing network optimization and improving the service quality of the network.

An Autonomous and Car-Following System via DSRC Communication (2012-01-0741)

Abstract: Inertia navigation system is capable to backup GPS unavailability. An autonomous system integrated different sensors to offer robots or remotely operated systems a reliable navigation means. This paper addresses an autonomous design method to accomplish continuously position positioning based on GPS positioning, gear-box speed, odometry, IMU and DSRC in deck reckoning. Besides, the availability of autonomous function is verified and applied using vehicles in car following or cooperative driving. This paper also presents an inter-vehicle geocasting format to accomplish multihop and car-following in cooperative driving and data exchanged based on GPS/IMU positioning and DSRC. The car following provides warning or situation awareness to drivers based on broadcast messaging the motions of neighboring vehicles obtained by one-way communication from other vehicles. The proposed system has the advantage of omnidirectional transmitting/receiving functions of DSRC module that provides 360-degree coverage in own surveillance region. The proposed system is carried out with theoretical application and hardware integration, and furthermore the result shows navigation ability and intelligent approach applicability.

A New Autonomous System (AS) for Wireless Mesh Network

Abstract: Multi-hop wireless mesh networks usually experience frequent link failure due to certain reasons such as channel interference, dynamic obstacles occurring in a network and even because of bandwidth demands of applications. Failures in WMN degrade the performance of WMN. Here we are proposing a new Autonomous system for Wireless Mesh Networks. The main objective of Autonomous system for WMN is to reduce manual configuration of network involved in maintenance of WMN. The Autonomous System for WMN is evaluated extensively through ns2-based simulation. The evaluation results show that Autonomous system surpass existing approaches and schemes in failure- recovery. This system helps in improving channel-efficiency by more than 88.6%. It also increases throughput, mean success rate of overall system and meets the various applications' bandwidth demands in the network.