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共 557 条记录，以下是371-380 订阅

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Current of the linear motor-based condition monitoring in milling

Current of the linear motor-based condition monitoring in mi...

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： X. Li R. Du B. Denkena J. Imiela Dept. of Automation & Computer-Aided Engineering The Chinese University of Hong Kong Shatin N. T. Hong Kong Chin. Institute Production Engineering and Machine Tools University Hanover Hanover Germany

ISBN: (纸本)078037925X

In recent years, a number of machine tools have been built using linear motors. These machine tools have great potential for precision and high speed machining. Nevertheless, a number of problems remain unsolved, such as monitoring and control. This paper presents a new tool breakage monitoring method for this type of machine tool by using the current of the linear motor. From a mathematical point of view, the new method uses a nonlinear energy operator to capture the abrupt changes of the motor current signal, which is directly related to the tool breakage. Experimental validation is included.

关键词： Condition monitoring Milling Machine tools Force sensors Force measurement Machining Costs Robots signal processing Production engineering

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A novel optical signal detecting and processing method for swarm robot vision system

A novel optical signal detecting and processing method for s...

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： Dongtang Ma Jibo Wei Zhaowen Zhuang College of Electronic Science and Engineering National University of Defense Technology Changsha China

ISBN: (纸本)078037925X

Communication capability plays an important role in the robot swarm systems (RSS), especially when they are used as soldiers during a war. Free space optical (FSO) communication is one of the best ways to exchange information between the leader and the followers in the RSS under a bad electromagnetic condition. It can be integrated as a part of the robot vision system (RVS). Pulse position modulation (PPM) is one of the most often used modulation techniques for FSO communication. As avalanche photodiode (APD) detector has high gain, high sensitivity and high response speed, it is a likely candidate to detect laser signals to meet the demands of RVS. This paper discusses the characteristics of noises in the optical signal detecting and processing subsystem as the PPM signal is considered in the RVS. Based on the ability of achieving topical characteristics of signals of wavelet transform, this paper brings forward a novel method of processing the APD detecting signals based on wavelet analysis. The soft threshold /spl sigma//spl middot//spl radic/(2 log (n)/a) is used to process the empirical wavelet coefficients. A primary simulation experiment and some analysis results are given.

关键词： signal processing signal detection Optical detectors Robot vision systems Optical sensors Pulse modulation Optical modulation Wavelet analysis Orbital robotics Optical pulses

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Fast power minimization with QoS constraints in multi-user MIMO downlinks

Fast power minimization with QoS constraints in multi-user M...

引用

2003 ieee international conference on Accoustics, Speech, and signal processing

作者： Spencer, Quentin H. Lee Swindlehurst, A. Haardt, Martin Dept. of Electrical Engineering Brigham Young University 459 CB Provo UT 84602 United States Communications Research Laboratory Ilmenau University of Technology P.O. Box 100565 D-98684 Ilmenau Germany

In the downlink of a multi-user MIMO (Multiple Input Multiple Output) communication system where each user has an arbitrary QoS requirement, intelligent algorithms are needed to choose transmit vectors. Here we present a new method of choosing transmit vectors that minimizes total transmitted power. The approach is based on previous iterative interference balancing algorithms, but it is initialized by applying a "block-diagonalization" algorithm that helps improve convergence speed. When the channel supports multiple data streams per user, power is distributed among the data streams by bit-loading using the channel gains derived from the block-diagonalization step. The result is a solution which is not guaranteed to converge to the global optimum, but will reach a solution that is either optimal or nearoptimal with high probability and at minimal computational cost.

关键词： Data communication systems

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A new method of radar clutter recognition based on multi-/spl alpha/ truncation set

A new method of radar clutter recognition based on multi-/sp...

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： Fang Xueli Liang Diannong Zou Kun Dong Zhen Huang Xiaotao School of Electronic Science and Technology National University of Defense Technology Changsha Hunan China

ISBN: (纸本)078037925X

Radar clutter recognition is very useful for modern radar signal processing system. /spl alpha/ truncation set feature extraction based method needs short samples and has very high recognition rate for log-normal distribution clutter, but suffers shortcomings of high error recognition rate to discriminate Weibull from K-distribution when the samples are short. A modified radar clutter recognition method based on /spl alpha/ truncation set feature extraction - multi-/spl alpha/ truncation set feature extraction based radar clutter recognition method is presented in this paper, we point out that this method is a generalized form of rectangular figure-based method. From the simulation results and analyzing of real radar clutter test, it is seen that this method is more valid, practical and prospective.

关键词： Feature extraction Radar signal processing Radar clutter Analytical models Higher order statistics Log-normal distribution Testing signal processing Parametric statistics Statistical analysis

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Acquisition of global information from local observation with movement construction of internal state-representation under partial observability

Acquisition of global information from local observation wit...

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： K. Inoue S. Ma J. Ota Ibaraki University Japan Ibaraki University The University of Tokyo Japan

Artificial agents operating in real world have to know the dynamics of interaction between the agent and the world. We focus on the role of mobility, which discovers the dynamics and brings global information to the agent with local observation ability. In this paper, we propose a method of behavior-acquisition by an agent operating in POMDP by autonomous acquisition of the internal state-representation while autonomously constructing observation space. In order to deal with partial observability of the environment, the agent constructs its internal state-representation that is a decision tree representing state-distinction according to its short-term memory of past observations and actions. The state-representation is constructed appropriately by successive segmentation based on real experience. We confirm that the proposed method, can acquire, navigation behavior of a real mobile robot by simulations and experiments.

关键词： Observability Mobile robots State estimation intelligent agent Shape Sensor systems Decision making

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Optimal free flight trajectory in air traffic management

Optimal free flight trajectory in air traffic management

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ieee international conference on robotics, intelligent systems and signal processing

作者： Wu Jun-Wei K.M. Tsang W.L. Chan Automation College Harbin Ship Engineering University Harbin China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China

ISBN: (纸本)078037925X

In this paper, the optimal free flight trajectory to avoid conflict in air traffic management (ATM) as investigated. The mathematic expression of this problem is derived based on the relative motion parameters and the safe separation condition of the planes. The energy of maneuver has been taken as the objective function, which is simplified by considering two-legged maneuver specified with a waypoint and making the resolution of maneuver not only shorter travel distance, but also less speed variation. The constraints taken into the account include separation condition, constant speed and constant heading, the relation between the turn time related to the waypoint and the relative motion parameters. The optimal strategy is solved by the determined optimal model.

关键词： Aircraft Air traffic control Energy resolution Aerospace control Centralized control Constraint optimization Robots signal processing Marine vehicles Aerospace engineering

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Algebraic independent component analysis

Algebraic independent component analysis

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： K. Waheed F.M. Salem Circuits Systems and Neural Networks Laboratory Michigan State University East Lansing MI USA

We present extended results of our recent algorithm for ICA of overcomplete mixtures, namely, the algebraic independent component analysis (AICA). This algorithm is based entirely on algebraic operations and vector-distance measures. AICA retains the stability and convergence properties of the previously proposed geometric ICA (geo-ICA) algorithms but has the advantage of reduced computational complexity. Secondly, the algebraic operations are robust against the inherent permutation and scaling issues in ICA further simplifying the performance evaluation of the ICA algorithms using algebraic measures. Thirdly, the algebraic framework is directly extendable to any dimension of ICA problems exhibiting only a linear increase in the complexity as a function of the dimension. The algorithm has been extensively tested for overcomplete, undercomplete and quadratic ICA using unimodal super Gaussian distributions. A discussion on possible extensions in the proposed algorithm and illustrative simulation examples are also included.

关键词： Independent component analysis signal processing algorithms Extraterrestrial measurements Source separation Matrix converters signal processing Blind source separation Circuits Neural networks Laboratories

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Modeling human skills to control dynamic systems

Modeling human skills to control dynamic systems

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ieee international conference on robotics, intelligent systems and signal processing

作者： Yongsheng Ou Yangsheng Xu Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)078037925X

There are many successful industrial applications of control methods based on imparting human skills. However, all applications to date are task-lever controllers, i.e., when switching from one task to another, they need to be retrained. We do not focus simply on task-level human learning control, but on how to produce a general control law in which we can input control targets, i.e., to enable us to change control targets for which controllers have not been trained. Using a dynamically stabilized but statically unstable single-wheel mobile robot - Gyrover - we use this new method to control and thus confirm the validity and efficiency of the method.

关键词： Humans Control system synthesis Neural networks Open loop systems Automatic control Application software Adaptive control Robots Hidden Markov models Control systems

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Automatic detection-localization of fault point on waveform and classification of power quality disturbance waveshape fault using wavelet and neural network

Automatic detection-localization of fault point on waveform ...

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： C. Dilokratanatrakool P.N. Na Ayudhya T. Chayavanich C. Prapanavarat Department of Electrical Engineering The King Mongkut's University of Technology Thonburi Bangkok Thailand Department of Electrical Engineering King Mongkut's University of Technology Bangkok Thailand

In this paper a new method for automatically detecting, localizing and classifying various types of disturbance waveshape fault is presented. The method is based on wavelet transform analysis, artificial neural networks, and the mathematical theory of evidence. The proposed detection and localization algorithm is carried out in the wavelet transform using multiresolution signal decomposition techniques. The proposed classification is carried out in sets of multiple neural network using a learning vector quantization networks. The outcomes of the networks are then integrated using voting decision making scheme.

关键词： Fault detection Power quality Neural networks Artificial neural networks Wavelet transforms signal resolution Wavelet analysis Vector quantization Voting Decision making

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A parallel algorithm for visual tracking of multiple free-swimming robot fishes based on color information

A parallel algorithm for visual tracking of multiple free-sw...

引用

ieee international conference on robotics, intelligent systems and signal processing

作者： Junzhi Yu Shuo Wang Min Tan Institute of Automation Chinese Academy and Sciences Beijing China

ISBN: (纸本)078037925X

Obtaining information of both action of multiple free-swimming robot fishes and environment quickly and accurately from image sequence is the foundation of making decision and control in a MRFS (multiple robot fishes cooperation system). The real-time vision subsystem of MRFS and its tracking strategy for multi-target are introduced in this paper. Combining features of the robot fish and location background, an adaptive segmentation algorithm based on hue histogram and saturation histogram is proposed, which can adapt the changing environmental conditions. At the same time, integrating with computer parallel processing technology, the overall tracking algorithms are optimized by means of MMX and SSE instructions. The designed visual subsystem has been implemented in MRFS, and the results have shown its effectiveness by successfully tracking multiple free-swimming fishes and obstacles.

关键词： Parallel algorithms Parallel robots Marine animals Histograms Image sequences Control systems Machine vision Image segmentation Computer aided instruction Concurrent computing

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