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Discrete-time modeling tools for DC-DC converters

Discrete-time modeling tools for DC-DC converters

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2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010

作者： Hamar, J. Nagy, I. Funato, H. Nishida, Y. Ohsaki, H. Masada, E. Department of Automation and Applied Informatics Budapest University of Technology and Economics Goldmann Gyorgy Ter 3 1111 Budapest Hungary MFKK Invention and Research Center Services Co. Ltd. Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Science Budapest Hungary Dept. of Electrical and Electronic Engineering Utsunomiya University Utsunomiya Japan Dept. of Electric Electronics and Computer Engineering Chiba Institute of Technology Japan University of Tokyo Tokyo Japan Railway Technology Research Institute Tokyo Japan

ISBN: (纸本)9781424453955

The objective of the discrete-time modeling tools is twofold. First, they give an insight into the basic ideas of discrete-time modeling of dc-dc converters for university students and interested power electronics specialists. Second, as it is being presented below, the interactive calculation tools facilitate the fast and simple model-development in WEB browser after entering the basic circuit and load parameters. This feature can especially be useful for the practicing design engineers, since without long calculations with matrix functions the linearized discrete-time system model is immediately and automatically developed in both mathematical form (state-space equations and transfer functions in the Z domain) and also in graphical form (pole-zero map and bode plot). © 2010 IEEE.

关键词： DC-DC converters

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Polytopic representation of impedance model with feedback delay

Polytopic representation of impedance model with feedback de...

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作者： Galambos, Péter Baranyi, Péter Korondi, Péter Computer and Automation Research Institute Hungarian Academy of Sciences Cognitive Informatics Group Hungary Budapest University of Technology and Economics Dept. of Manufacturing Science and Technology Hungary Budapest University of Technology and Economics Dept. of Telecommunications and Media Informatics Hungary Budapest University of Technology and Economics Dept. of Mechatronics Optics and Engineering Informatics Hungary

ISBN: (纸本)9789549260014

In haptic and telemanipulation devices stability and transparency are contradicting requirements. Due to the network delay the control process may become unstable. In our research we consider the coupled impedance type control algorithms for force reflecting telemanipulation. In this paper, an extended TP model transformation is proposed to convert the delayed system into a polytopic tensor product (TP) model considering the value of the feedback delay as a parameter. Using such model, the design of a stabilizing controller become easier as it does not contain feedback delay. As example, a single degree of freedom impedance model with feedback delay is discussed. The results are confirmed by numerical simulation.

关键词： Degrees of freedom (mechanics)

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AFM tip on-line positioning by using the landmark in nano-manipulation

AFM tip on-line positioning by using the landmark in nano-ma...

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2010 4th IEEE Nanotechnology Materials and Devices Conference, NMDC2010

作者： Yuan, Shuai Liu, Lianqing Wang, Zhidong Xi, Ning Wang, Yuechao Dong, Zaili Wang, Zhiyu State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China Dept. of Advanced Robotics Chiba Institute of Technology Chiba 275-0016 Japan Dept. of Electrical and Computer Engineering Michigan State University United States

ISBN: (纸本)9781424488964

AFM has been proved to be a powerful nano-manipulation tool taking advantage of its ultra high resolution and precision. However the large spatial uncertainties associated with AFM tip positioning dual to the PZT nonlinearity and thermal drift are still challenging problems, which hinders its wide application especially in building complex structures In this paper, a probabilistic approach combined with the Kalman filter based localization algorithm is proposed to improve the accuracy of the tip positioning in the task space coordinate frame. A motion model based on the Prandtl-Ishlinskii (PI) model is established, the distribution of model error is statistically obtained through the experimental calibration process. In addition, to further reduce the tip position uncertainties, an environment measurement models is developed through sensing the landmark intermittently with local scanning method during manipulation. Both the simulations results and experimental results are presented to demonstrate the validity of the proposed method. © 2010 IEEE.

关键词： Uncertainty analysis

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A probabilistic approach for on-line positioning in nano manipulations

A probabilistic approach for on-line positioning in nano man...

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2010 8th World Congress on Intelligent Control and automation, WCICA 2010

作者： Yuan, Shuai Liu, Lianqing Wang, Zhidong Xi, Ning Wang, Yuechao Dong, Zaili Wang, Zhiyu State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China Graduate University Chinese Academy of Sciences Beijing 100039 China Dept. of Advanced Robotics Chiba Institute of Technology Chiba 275-0016 Japan Dept. of Electrical and Computer Engineering Michigan State University United States

ISBN: (纸本)9781424467129

Nanomanipulation and nanoassembly using atom force microscopy (AFM) is a potential and promising technology for nanomanufacturing. Precise position of the tip of AFM is important to increase the accuracy and efficiency on fabricate complex nanostructures. However at the nano-scale, it is difficult to acquire the tip position expressed by the coordinate in real time due to PZT nonlinearity and thermal drift through the general measure. In this paper, a probabilistic approach incorporating a Kalman filter based localization algorithm is introduced into the on-line estimation of the tip position expressed by probability distribution known as probability density function. A probabilistic motion model of AFM tip is introduced that consists of a PZT dynamic model based on the Prandtl-Ishlinskii (PI) model, and motion error distribution obtained from calibration experiments. An observation model by using a local scanning algorithm is proposed and the change of uncertainty distribution on scanning landmarks, e.g. nano-particles, near the target position is analyzed. Some experiment results are included for showing the motion error distribution and a simulation result is presented to illustrate the validity of the proposed method. © 2010 IEEE.

关键词： Kalman filters

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Approximate Off-Line Receding Horizon Control of Constrained Nonlinear Discrete-Time Systems: Smooth Approximation of the Control Law

Approximate Off-Line Receding Horizon Control of Constrained...

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American Control Conference

作者： Gilberto Pin Marco Filippo Felice Andrea Pellegrino Gianfranco Fenu Thomas Parisini Danieli Automation S.p.A Dept. of Electrical Electronic and Computer Engineering DEEI University of Trieste Italy

ISBN: (纸本)9781424474264

In this work, the off-line approximation of state-feedback nonlinear model predictive control laws by means of smooth functions of the state is addressed. The idea is to investigate how the approximation errors affect the stability of the closed-loop system, in order to derive suitable bounds which have to be fulfilled by the approximating function. This analysis allows to conveniently set up the characteristic parameters of some techniques such as Neural Networks which can be used to implement the control law, in order to render the system Input-to-State Practically Stable while satisfying, in addition, hard constraints on the trajectories;both the amount of data storage and the computational time result strongly reduced with respect to Nearest Neighbor or Set Membership approaches, which have been recently proposed to obtain effective off-line approximation of nonlinear MPC. The provided simulations confirm the validity of the method.

关键词： control law Approximate OFF LINE approximation nonlinear model predictive control Nearest neighbor Data Storage Approximation error computational time Closed loop systems

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Investigation of tier-swapping to improve the thermal profile of memory-on-logic 3DICs

Investigation of tier-swapping to improve the thermal profil...

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作者： Melamed, Samson Thorolfsson, Thorlindur Srinivasany, Adi Chengy, Edmund Franzon, Paul Davis, W. Rhett Dept. of Electrical and Computer Engineering North Carolina State University Box 7911 Raleigh NC 27695 United States Gradient Design Automation 4633 Old Ironsides Drive Santa Clara CA 95054 United States

ISBN: (纸本)9782355000126

In 3DICs heat dissipating devices are stacked directly on top of each other leading to a higher heat density than in a comparable 2D chip. 3D integration also moves the majority of active devices further away from the heatsink. This results in a degraded thermal path which makes it more challenging to remove heat from the active devices. Gradient HeatWave-3DIC was used to perform an appropriate 3D thermal analysis on a 1024-point, memory-on-logic 3DIC FFT processor for synthetic aperture radar (SAR). The chip was simulated with a spatial resolution of 80 nm, and was modeled to include the effect of each line of interconnect, as well as each via and fill structure exactly as drawn in the layout. Large isolated temperature spikes were found near groups of clock buffers at the edge of the SRAMs on the middle tier. The effect of reordering the stackup of memory and logic tiers has been investigated. It was found that placing the memory tier closer to the heatsink improved not only the thermal profile of the memories but also of the logic tiers. Temperature spikes in the memories no longer significantly impacted the logic tiers, yielding a design where the thermal profile of the tiers were significantly less dependent on each other.

关键词： Thermoanalysis

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A Locality Sensitive Hashing Approach for Conceptual Classification

A Locality Sensitive Hashing Approach for Conceptual Classif...

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International Conference on Semantic Computing

作者： Luciano B. de Paula Rodolfo S. Villaça Maurício F Magalhães Dept. of Engineering and Computing (DECOM/CEUNES) Federal University of Espírito Santo (UFES) Brazil Dept. of Computer Engineering and Industrial Automation (DCA) State University of Campinas (UNICAMP) Brazil

The increasing volume of semantic content available in the Web, generally classified by concept hierarchies or simple ontologies, turns the searching and reasoning upon these data a great challenge. Generally, a search in Semantic Web may not be addressed to a specific document, but to a group of data classified in the same concept. Several structures used to distribute data, e.g. P2P networks, use hash values to identify these data, without maintaining the semantic values of the stored data. This paper contributes by proposing the creation of hash values that keep similar data stored near to each other in a P2P network, reducing the effort to retrieve similar data. The proposed hash values are derived from the data classification based on ontologies, using locality sensitive hashing (LSH) functions.

关键词： Ontologies Semantics Vocabulary Indexing Topology Gaussian distribution

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computer vision approach for robotic polishing application using artificial neural networks

Computer vision approach for robotic polishing application u...

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Student Conference on Research and Development (SCOReD)

作者： Adnan Rachmat Anom Besari Anton Satria Prabuwono Ruzaidi Zamri Md.Dan Md. Palil Department of Computer Engineering Electronic Engineering Polytechnic Institute of Surabaya (EEPIS-ITS) Indonesia Dept. of Computer Engineering Electronics Engineering Polytechnic Institute of Surabaya (EEPIS) Indonesia Faculty of Information Science and Technology Universiti Kebangsaan Malaysia (UKM) Malaysia Dept. of Robotic and Automation Universiti Teknikal Malaysia Melaka (UTeM) Malaysia Dept. of Robotic and Automation Universiti Teknikal Malaysia Melaka (UTeM)

Polishing is a highly skilled manufacturing process with a lot of constraint and interaction with environment. Unfortunately, manual polishing process takes time consuming of the total manufacturing time and takes a significant cost. On top of that, undesired working condition exists due to dust and noise and next it is quite difficult to find skilled technicians. Therefore, it is necessary to develop an automation system on the polishing process. One of the automation systems that are often developed by the industry is the use of robots. The goal is to handle the repetitive work that humans are not able to do so. In general, the purpose of polishing is to get the uniform surface roughness distributed evenly throughout part's surface. This research combines computer vision and robotics systems to overcome the problems arising in the polishing process. Vision system is used to measure surface defect that divide into several categories. The surface data is learned using artificial neural networks then give the decisions to move the actuator on robot. Parameters that developed in this system are force and time polishing which has a significant effect on the polishing process. Therefore, this system studies the characteristics of surface defects before the given action with different value of force and polishing time, and then compared with surface defects after given the action. Results obtained show that it is possible to obtain surface parameters using vision-based methods with a certain limit of accuracy. However, there are some advantages using this system, including faster polishing time, simpler quality inspection, and more evenly surface roughness result compared with manual polishing. The overall results of this research would encourage further developments to achieve robust computer vision technique for robotic polishing application.

关键词： Rotation measurement Time measurement Variable speed drives Robots

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Extended Recursively Feasible Model Predictive Control by Two-Stage Online Optimization

Extended Recursively Feasible Model Predictive Control by Tw...

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American Control Conference

作者： Gilberto Pin Thomas Parisini Danieli Automation S.p.A. (UD) Italy Dept. of Electrical Electronic and Computer Engineering DEEI University of Trieste Italy

ISBN: (纸本)9781424474264

In this work, a novel Model Predictive Control (MPC) scheme for the robust state-feedback stabilization of constrained discrete-time linear and nonlinear systems is proposed. In the last few years, invariant set theory has provided sufficient conditions to ensure the recursive feasibility of the constrained optimization problem associated to the MPC. In particular, it has emerged that the robustness of the classical MPC with stabilizing terminal state constraint depends on the invariance properties of the specified final constraint set. In this framework, with the aim to enlarge the set of admissible perturbations beyond the limit of one-step recursive feasibility, an algorithm based on two-stage optimization is presented. When only practical stabilization is needed, the devised method allows to use as terminal constraint also sets which are not one-step robustly controllable, while preserving the extended recursive feasibility property.

关键词： Predictive models Predictive control Uncertainty Robust control Constraint optimization Robustness Control systems Set theory Nonlinear systems Constraint theory

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Tensor Product Model Transformation Based Friction Compensation of a Mechatronic System

Tensor Product Model Transformation Based Friction Compensat...

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International Conference on Intelligence engineering Systems

作者： Bela Takarics Peter Korondi Peter Baranyi Dept. of Mechatronics Optics and Engineering Informatics Budapest University of Technology and Economics Cognitive Informatics Research Group Computer and Automation Research Institute

ISBN: (纸本)9781424476527

The Tensor Product (TP) model transformation is a recently proposed technique for transforming given Linear Parameter-Varying (LPV) state-space models into polytopic model form, namely, to parameter-varying convex combination of Linear Time Invariant (LTI) systems. The main advantage of the TP model transformation is that it is executable in a straightforward way and the Linear Matrix Inequality (LMI) based control design frameworks can immediately be applied to the resulting polytopic models to yield controllers with tractable and guaranteed performance. The main contribution of this paper is that it represents the friction of a DC servo drive in TP model form, automatically designs LMI based controller for friction compensation. The reference signal compensation is also based on the TP model transformation. The results were simulated for speed control of the DC servo drive and were compared to other control techniques.

关键词： Non-linear system control Friction compensation DC servo drive Simulation

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