Дисертації з теми "Robust excitation"
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Fan, Lingling. "Robust decentralized control of power systems through excitation systems and thyristor controlled series capacitors." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2242.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains x, 121 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 99-103).
Chowdhary, Girish. "Concurrent learning for convergence in adaptive control without persistency of excitation." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37243.
Повний текст джерелаMseddi, Amina. "Modélisation et commande d’un générateur éolien à double excitation isolé en vue de l’amélioration de son rendement et de la diminution de la fatigue mécanique." Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG1032.
Повний текст джерелаThis subject contributes to the modeling and control of a wind conversion system based on a Double Excitation Synchronous Generator (DESG). The degree of freedom provided by the wound excitation allows the improvement of the energy efficiency on the operation’s cycles with random solicitations, as it is the case for wind turbines.The aim of this research is to implement robust control techniques for the DESG in order to optimize its aerodynamic efficiency and to reduce its mechanical loads. In this context, a hybrid generator connected to an isolated load for wind applications is presented. First, linear models are established. These models are used to set up the appropriate control structures from both an electrical and mechanical point of view. At the same time, very complete nonlinear models are developed allowing a validation in an advanced simulation platform taking into account the space harmonics of the generator, the switching effects of the converters and the torsional effects on the shaft. Moreover, a 3 kW wind emulator is built to evaluate the contribution of the hybrid generator in the wind conversion systems field and then improve the synthesized controllers. Two robust control strategies for a hybrid machine are implemented and a comparison between a CRONE controller and a H∞ controller is presented. Satisfying results are obtained with a better performance for the CRONE regulator compared to H∞ one. In addition to the problem of optimizing the production of the wind energy conversion system, attempts have also been made to reduce the generator harmonic distortion ratios by using two solutions: passive filtering and reduction of the electromagnetic torque ripple by acting on the excitation current. Although there are improvements at high rotation speeds, these solutions are not sufficient for a connection of the proposed architecture to the grid.Once the applicability of the DESG in the wind energy field has been proven in the case of a 3 kW wind conversion system, we have considered a more realistic case. To this end, we have interfaced the developed advanced electric model with an aeroelastic model available on the FAST software, to take into account the mechanical couplings and the flexibilities. The turbine chosen for the study is the WindPACT 1.5MW turbine. In this part, robust controllers dealing with the reduction of mechanical fatigue are developed.The model of WindPACT turbine based on the hybrid generator is finally connected to the grid and the control laws necessary for this connection are implemented and validated under the Matlab Simulink platform
Azad, Abul K. "Robust Speech Filter And Voice Encoder Parameter Estimation using the Phase-Phase Correlator." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/97221.
Повний текст джерелаDoctor of Philosophy
Impulsive noise is a natural phenomenon in everyday experience. Impulsive noise can be analogous to discontinuities or a drastic change in natural progressions of events. Specifically in this research the disrupting events can occur in signals such as speech, power transmission, stock market, communication systems, etc. Sudden power outage due to lighting, maintenance or other catastrophic events are some of the reasons why we may experience performance degradation in our electronic devices. Another example of impulsive noise is when we play an old damaged vinyl records, which results in annoying clicking sounds. At the time instance of each click, the true music or speech or simply the audible waveform is completely destroyed. Other examples of impulse noise is a sudden crash in the stock market; a sudden dive in the market can destroy the regression and future predictions. Unfortunately, in the presence of impulsive noise, classical methods methods are unable to filter out the impulse corruptions. The intended filtering objective of this dissertation is specific, but not limited, to speech signal processing. Specifically, research different filter model to determine the optimum method of eliminating impulsive noise in speech. Note, that the optimal filter model is different for time series signal model such as speech, stock market, power systems, etc. In our studies we have shown that our speech filter method outperforms the state of the art algorithms. Another major contribution of our research is in speech compression algorithm that is robust to impulse noise in speech. In digital signal processing, a compression method entails in representing the same signal with less data and yet convey the the same same message as the original signal. For example, human auditory system can produce sounds in the range of approximately 60 Hz and 3500 Hz, another word speech can occupy approximately 4000 Hz in frequency space. So the challenge is, can we compress speech in one of half of that space, or even less. This is a very attractive proposition because frequency space is limited but the wireless service providers desires to service as many users as possible without sacrificing quality and ultimately maximize the bottom line. Encoding impulse corrupted speech produces harsh quality of synthesized audio. We have shown if the encoding is done with the proposed method, synthesized audio quality is far superior to the sate of the art.
Spangenberg, Ulrich. "Development of a robust output-only strain based damage detection technique for wing-like structures, requiring a minimum number of sensors." Diss., University of Pretoria, 2009. http://hdl.handle.net/2263/30065.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2009.
Mechanical and Aeronautical Engineering
unrestricted
Schaefers, Jos. "Contribution à l'identification des paramètres des robots : application à un robot kuka." Nancy 1, 1992. http://www.theses.fr/1992NAN10361.
Повний текст джерелаMaghenem, Mohamed Adlene. "Stability and Stabilization of Networked Systems." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS186/document.
Повний текст джерелаIn this thesis, we propose a Lyapunov based approaches to address some distributedsolutions to multi-agent coordination problems, more precisely, we consider a groupof agents modeled as nonholonomic mobile robots, we provide a distributed controllaws in order to solve the leader-follower and the leaderless consensus problems under different assumptions on the communication graph topology and on the leader’strajectories. The originality of this work relies on the closed-loop analysis approach, that is, it consists on transforming the last two problems into a global stabilization problem of an invariant set. The stability analysis is mainly based on the construction of strict Lyapunov functions and strict Lyapunov-Krasovskii functionals for a classes of nonlinear time-varying and/or delayed systems
Cunningham, Daniel Philip. "The Winch-Bot : a cable-suspended, under-actuated robot utilizing parametric self-excitation." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50576.
Повний текст джерелаIncludes bibliographical references (leaf 71).
A simple, compact, yet powerful robotic winch, called "Winch-Bot," is presented in this thesis. The Winch-Bot is an underactuated robot having only one controllable axis. Although hanging a load with merely one cable, it is capable of moving it in a large workspace by swinging the load dynamically based on parametric self-excitation. The generated trajectories can be used for a variety of tasks, from moving material to cyclic inspection of surfaces. The basic principle and design concept of the Winch-Bot are first described, followed by dynamic modeling and analysis. Two trajectory generation problems are solved. One is point-to-point transfer of a load, and the other is the tracking of a continuous path. It will be shown that the system can track a given geometric trajectory, although the tracking velocity cannot be determined arbitrarily due to the underactuated nature of dynamics. A prototype Winch-Bot is designed and built, and point-to-point, continuous path, and parametric excitation control are implemented.
by Daniel Philip Cunningham.
S.M.
Stegmann, Robert [Verfasser], Norbert [Akademischer Betreuer] Pietralla, and Thomas [Akademischer Betreuer] Aumann. "One-Quadrupole-Phonon States of Heavy Vibrational Nuclei Studied in Coulomb Excitation / Robert Stegmann ; Norbert Pietralla, Thomas Aumann." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1144484278/34.
Повний текст джерелаOlsson, Rasmus. "Identifiering av stelkroppsmodell för industrirobot." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5535.
Повний текст джерелаIn this masters thesis we consider a method for experimental identification of the inertial parameters of an industrial robot, using measured torques and joint angles. A dynamic model of the first three joints of the robot has been identified.
To achieve good identification results, it is important to carefully choose the trajectory for the experimental identification. A method to generate trajectories using two suggested design criteria has been used and evaluated using an ABB industrial robot, and one of them yields good identification results.
Denna rapport behandlar en metod för experimentell identifiering av en stelkroppsmodell för en industrirobot. Metoden använder sig av uppmätta moment och armvinklar för att identifiera parametrarna i en dynamikmodell för robotens tre huvudaxlar.
För att erhålla bra identifieringsresultat är det viktigt att välja en lämplig identifieringsbana och i detta arbete har en metod för generering av banor använts och utvärderats för två olika designkriterier. Experiment har utförts på en industrirobot från ABB och vi har erhållit goda identifieringsresultat med ett av designkriterierna.
Martin, Corinna [Verfasser], Robert [Gutachter] Blum, Heike [Gutachter] Rittner, and Erhard [Gutachter] Wischmeyer. "Oxidized phospholipids and their role in neuronal excitation of primary sensory neurons / Corinna Martin ; Gutachter: Robert Blum, Heike Rittner, Erhard Wischmeyer." Würzburg : Universität Würzburg, 2018. http://d-nb.info/1156534100/34.
Повний текст джерелаTrippel, Richard [Verfasser], Robert [Akademischer Betreuer] Roth, and Achim [Akademischer Betreuer] Schwenk. "Collective Excitations with Chiral NN+3N Interactions from Coupled-Cluster and In-Medium SRG / Richard Trippel ; Robert Roth, Achim Schwenk." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1122286414/34.
Повний текст джерелаAlvarez, Jarquin Nohemi. "Consensus variant dans le temps : application à la formation de véhicles." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112092/document.
Повний текст джерелаThe multiple applications related to networked multi-agent systems such as satellite formation flying, coupled oscillators, air traffic control, unmanned air vehicles, cooperative transport, among others, has been undoubtedly a watershed for the development of this thesis. The study of cooperative control of multi-agent systems is of great interest for his extensive field work and applications. This thesis is devoted to the study of consensus seeking of multi-agents systems and trajectory tracking of nonholonomic mobile robots.In the context of consensus seeking, first we study a ring topology of dynamic agents with time-dependent communication links which may disconnect for long intervals of time. Simple checkable conditions are obtained by using small-gain theorem to guarantee the achievement of consensus. Then, we deal with a network of dynamic agents with time-dependent communication links interconnected over a time-varying topology. We establish that consensus is reached provided that there always exists a « spanning-tree » for a minimal dwell-time by using stability theory of time-varying and switched systems. In the context of trajectory tracking, we investigate a simple leader-follower tracking controller for autonomous vehicles following straight lines. We show that global tracking may be achieved by a controller which has a property of persistency of excitation tailored for nonlinear systems. Roughly speaking the stabilisation mechanism relies on exciting the system by an amount that is proportional to the tracking error. Moreover, the method is used to solve the problem of formation tracking of multiple vehicles interconnected on the basis of a « spanning-tree » topology. We derive stability conditions for the kinematic and dynamic model by using a Lyapunov approach
Erler, Bastian [Verfasser], Robert [Akademischer Betreuer] Roth, and Gabriel [Akademischer Betreuer] Martínez-Pinedo. "Mean-Field Approach to Collective Excitations in Deformed sd-Shell Nuclei Using Realistic Interactions / Bastian Erler. Betreuer: Robert Roth ; Gabriel Martínez-Pinedo." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2012. http://d-nb.info/110611700X/34.
Повний текст джерела"A robust low bit rate quad-band excitation LSP vocoder." Chinese University of Hong Kong, 1994. http://library.cuhk.edu.hk/record=b5888223.
Повний текст джерелаThesis (M.Phil.)--Chinese University of Hong Kong, 1994.
Includes bibliographical references (leaves 103-108).
Chapter Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Speech production --- p.2
Chapter 1.2 --- Low bit rate speech coding --- p.4
Chapter Chapter 2 --- Speech analysis & synthesis --- p.8
Chapter 2.1 --- Linear prediction of speech signal --- p.8
Chapter 2.2 --- LPC vocoder --- p.11
Chapter 2.2.1 --- Pitch and voiced/unvoiced decision --- p.11
Chapter 2.2.2 --- Spectral envelope representation --- p.15
Chapter 2.3 --- Excitation --- p.16
Chapter 2.3.1 --- Regular pulse excitation and Multipulse excitation --- p.16
Chapter 2.3.2 --- Coded excitation and vector sum excitation --- p.19
Chapter 2.4 --- Multiband excitation --- p.22
Chapter 2.5 --- Multiband excitation vocoder --- p.25
Chapter Chapter 3 --- Dual-band and Quad-band excitation --- p.31
Chapter 3.1 --- Dual-band excitation --- p.31
Chapter 3.2 --- Quad-band excitation --- p.37
Chapter 3.3 --- Parameters determination --- p.41
Chapter 3.3.1 --- Pitch detection --- p.41
Chapter 3.3.2 --- Voiced/unvoiced pattern generation --- p.43
Chapter 3.4 --- Excitation generation --- p.47
Chapter Chapter 4 --- A low bit rate Quad-Band Excitation LSP Vocoder --- p.51
Chapter 4.1 --- Architecture of QBELSP vocoder --- p.51
Chapter 4.2 --- Coding of excitation parameters --- p.58
Chapter 4.2.1 --- Coding of pitch value --- p.58
Chapter 4.2.2 --- Coding of voiced/unvoiced pattern --- p.60
Chapter 4.3 --- Spectral envelope estimation and coding --- p.62
Chapter 4.3.1 --- Spectral envelope & the gain value --- p.62
Chapter 4.3.2 --- Line Spectral Pairs (LSP) --- p.63
Chapter 4.3.3 --- Coding of LSP frequencies --- p.68
Chapter 4.3.4 --- Coding of gain value --- p.77
Chapter Chapter 5 --- Performance evaluation --- p.80
Chapter 5.1 --- Spectral analysis --- p.80
Chapter 5.2 --- Subjective listening test --- p.93
Chapter 5.2.1 --- Mean Opinion Score (MOS) --- p.93
Chapter 5.2.2 --- Diagnostic Rhyme Test (DRT) --- p.96
Chapter Chapter 6 --- Conclusions and discussions --- p.99
References --- p.103
Appendix A Subroutine of pitch detection --- p.A-I - A-III
Appendix B Subroutine of voiced/unvoiced decision --- p.B-I - B-V
Appendix C Subroutine of LPC coefficients calculation using Durbin's recursive method --- p.C-I - C-II
Appendix D Subroutine of LSP calculation using Chebyshev Polynomials --- p.D-I - D-III
Appendix E Single syllable word pairs for Diagnostic Rhyme Test --- p.E-I
"Exploitation of phase and vocal excitation modulation features for robust speaker recognition." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075192.
Повний текст джерелаSpeaker recognition (SR) refers to the process of automatically determining or verifying the identity of a person based on his or her voice characteristics. In practical applications, a voice can be used as one of the modalities in a multimodal biometric system, or be the sole medium for identity authentication. The general area of speaker recognition encompasses two fundamental tasks: speaker identification and speaker verification.
Wang, Ning.
Adviser: Pak-Chung Ching.
Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .
Thesis (Ph.D.)--Chinese University of Hong Kong, 2011.
Includes bibliographical references (leaves 177-193).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
Wu, Chang-Han, and 吳昌翰. "Optimal Design for Robust Tuned Mass Dampers and the Performance under Excitation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/3r28r7.
Повний текст джерела國立臺灣大學
土木工程學研究所
105
In recent years, tuned mass dampers have been widely used to control the vibrations. TMDs are often adopted in high-rise buildings, long-span bridges, and machines of high-tech factory to reduce the vibration and the discomfort. However, the values of TMD parameters determine the effectiveness. There are several design formulas for the structure without inherent damping, but in reality the structure has inherent damping. Therefore, it is necessary to use the iteration method to obtain the optimal design variables, and this study integrates two algorithms to find the best solution and optimal design variables rapidly and efficiently. Generally, the tuned mass damper design emphasizes the reducing effect rather than the robustness. However, TMD is sensitive to the frequency between the structure and the TMD. The reducing effect deteriorates if the frequency shift away from the optimal value. Therefore, this study proposes the optimal design method of robust tuned mass damper, considering the condition of the reducing effect and the variability of the frequency simultaneously, and then make a comparison between the effectiveness of the general design and the robust design. In the researches, it is quite common to design TMDs by simplifying MDOF model to SDOF model rather than the real structure. If the analytical results are similar, it is much rapider and easier to solve the problem by using SDOF model. Furthermore, the performance of system with TMD sometimes becomes worse when the structure is affected by the earthquakes, so the actual earthquake records are used to examine the result statistically in this study, and finally make a comparison between the performance of the general design and the robust design under the earthquakes.
Achuth, Rao M. V. "Probabilistic source-filter model of speech." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5555.
Повний текст джерелаYuan, Jing. "Adaptive control of NTV plants without persistent excitations: an application in robotics." Thesis, 1991. https://dspace.library.uvic.ca//handle/1828/9514.
Повний текст джерелаGraduate