Tesis sobre el tema "Closed loop delay compensation"
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PEROTTI, MICHELE. "Software Solutions to Mitigate the Electromagnetic Emissions of Power Inverters". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842505.
Texto completoMyklebust, Andreas. "Closed Loop System Identification of a Torsion System". Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-17531.
Texto completoA model is developed for the Quanser torsion system available at Control Systems Research Laboratory at Chulalongkorn University. The torsion system is a laboratory equipment that is designed for the study of position control. It consists of a DC motor that drives three inertial loads that are coupled in series with the motor, and where all components are coupled to each other through torsional springs.
Several nonlinearities are observed and the most significant one is an offset in the input signal, which is compensated for. Experiments are carried out under feedback as the system is marginally stable. Different input signals are tested and used for system identification. Linear black-box state-space models are then identified using PEM, N4SID and a subspace method made for closed-loop identification, where the last two are the most successful ones. PEM is used in a second step and successfully enhances the parameter estimates from the other algorithms.
Moon, Seung Ryul. "Hybrid PWM Update Method for Time Delay Compensation in Current Control Loop". Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/84929.
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Saarinen, I. (Ilkka). "Reverse link feedback power control in pilot symbol assisted systems". Doctoral thesis, University of Oulu, 2000. http://urn.fi/urn:isbn:9514257626.
Texto completoCesaretti, Juan Manuel. "Mechanical stress and stress compensation in Hall sensors". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28202.
Texto completoKichel, Caetano Bevilacqua. "Metodologia não intrusiva para estimação do tempo morto em sistemas monovariáveis". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/172072.
Texto completoAmong the limiting factors of control systems, the pure time delay is one of the most critical and difficult to estimate without an intrusive perturbation. The knowledge of its value is essential for model identification and control loop performance assessment. This work proposes a methodology to determine dead time using ordinary closed loop operating data. The main advantage over available techniques is the non-necessity of intrusive plant tests. The proposed approach is based on a signal processing for removing the effects of the unmeasured disturbances and the model-plant mismatches. The signal processing consists of the minimization of the oscillations of the smoothing open loop error as a function of the pure time delay. Several objective function formulations and smoothing procedures were studied in order to facilitate parameter estimation. The quality of the methodology is illustrated by simulations in a series of scenarios, which simulate linear processes of different characteristics under the effect of different disturbances. The methodology is also tested in case studies with real industrial process data. Results are compared to literature approaches and show the method was effective to estimate the pure time delay for most cases.
Talarcek, Steven C. "An Experimental Study of Disturbance Compensation and Control for a Fractional-Order System". University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1542303891784113.
Texto completoRamesh, Chithrupa, Henrik Sandberg y Karl Henrik Johansson. "Stability analysis of multiple state-based schedulers with CSMA". KTH, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-111461.
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Calou, Paul. "Mesure et compensation de bâtiments navals à l’aide de capteurs magnétiques trois composantes". Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAH018.
Texto completoThis PhD thesis aims to apply geophysical practices to another magnetic branch which deals with ship’s signature and magnetization with different methods and habits. Firstly, we present the specificity and practices of each domain, introducing the key notions as well as the differences between each kind of measurement. We check the validity of the approximation corresponding to total-field magnetic anomalies in the particular case of our measurements. In a second time, chapter 2 and 3, a mathematical relation is demonstrated between the scalar anomaly and the three components of the anomaly field based on the equivalent layer method. Chapter 4 summarize the experimental work, focusing on the determination of the best electrical current to compensate the ship’s magnetic signature. The experimental system is presented as well as the main results obtained. In chapter 5, a new approach for closed loop degaussing system is presented, based on a compensation algorithm. We also show some results obtained thanks to the compensation with three-component magnetometers onboard a real ship. Chapter 6 corresponds to an article submitted to a scientific journal (IEEE) that summarize most of the problematics of the thesis
Miranda, Filipe Costa Pinto dos Reis. "Identificação de sistemas em malha fechada usando controlador preditivo multivariável: um caso industrial". Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-19082005-151031/.
Texto completoSystem identification is a major task in the process of implementing Model-based Predictive Control (MPC) algorithms in industrial applications. Once the controller is working, there is a tendency to leave it with the original model for a long time, neglecting changes to the process during this time, leading to performance degradation. This work proposes a simple and effective methodology to re-identify plants under MPC in closed loop. The main issues concerning this problem are discussed, and choices for experiments are made. A Matlab case involving a 2x2 problem is presented, covering a range of different situations, and a comparison between identification using PRBS reference signals and standard step tests is shown. An industrial case is studied, applying the proposed method to a real situation, re-identifying an existing MPC model and reconfiguring it afterwards. This methodology is based on the application of multivariable perturbations on the controlled variables set-points or active restrictions, obtaining an ARX model structure. It uses an automatic process identification proceeding, keeping the process under control along the tests.
Saligane, Mehdi. "Adaptive body biasing system for margins reduction using delay and temperature monitoring at near threshold operation". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4716.
Texto completoIoT applications continue to push towards ultra-low-power constrained ASICs, creating severe challenges to achieve sufficient power efficiency in extreme Voltage and Temperature conditions. Thus, it is necessary to build closed-loop compensation systems that are autonomous to environmental conditions especially temperature at sub-threshold regime. Two major work are proposed: an adaptive techniques that allow to enhance the performance of designs that leverage aggressive voltage scaling. we fully exploits the FD-SOI 28nm technology dual gate capabilities to both attain optimal power efficiency points and compensate for gradual changes in overall device performance due to process, voltage, and temperature variations. Our proposed compensation Unit system is a fully-digital error-prediction solution providing a compromise between industry reliability requirements and manufacturing guard-band reduction with low-invasiveness and post-silicon tunability. Critical-Paths timing monitors are distributed across the processor and tuned to match the closest critical paths. A programmable workload emulator allows to adapt and take into account the processor tasks. Generated warning Flags due to V-T variations are analyzed based on an adjustable warning rate and body bias is adapted correspondingly. Based on the operation voltage, either fine or coarse body biasing can be activated for compensation. The second part of this thesis addresses on-chip temperature monitoring that plagues aggressively voltage scaled ASICs. We propose to closely monitor temperature fluctuations at low-voltage but also hot-spot detection at nominal and over-drive supply voltage conditions
Merkl, Ralf [Verfasser], Jörg [Akademischer Betreuer] Franke, Jörg [Gutachter] Franke, Christian [Gutachter] Rehtanz, Dirk [Gutachter] Westermann, Jörg [Herausgeber] Franke, Nico [Herausgeber] Hanenkamp, Marion [Herausgeber] Merklein, Michael [Herausgeber] Schmidt y Sandro [Herausgeber] Wartzack. "Closed-Loop Control of a Storage-Supported Hybrid Compensation System for Improving the Power Quality in Medium Voltage Networks / Ralf Merkl ; Gutachter: Jörg Franke, Christian Rehtanz, Dirk Westermann ; Betreuer: Jörg Franke ; Herausgeber: Jörg Franke, Nico Hanenkamp, Marion Merklein, Michael Schmidt, Sandro Wartzack". Erlangen : FAU University Press, 2021. http://d-nb.info/1229194266/34.
Texto completoDeng, Kangfa, Gerald Gerlach y Margarita Guenther. "Force-compensated hydrogel-based pH sensor". SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35185.
Texto completoRittmeier, Sebastian. "Systemunterstützte Umformung". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1193690438091-21707.
Texto completoAdamík, Pavel. "Řízení dynamických systémů v reálném čase". Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2009. http://www.nusl.cz/ntk/nusl-236759.
Texto completoLee, Peter Ming Wong. "Delay compensated fade prediction based CDMA closed loop power control". Thesis, 2004. http://hdl.handle.net/2429/15640.
Texto completoHo, Jyun-Che y 何峻徹. "On Loop Delay Compensation Design for Continuous-Time ΣΔ ADC". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/00065990850436789392.
Texto completo國立交通大學
電機與控制工程系所
96
A ΔΣ modulator is well-known as a very efficient technique for the implementation of high resolution A/D converters in low to medium bandwidth applications. Comparing with switched-capacitor (discrete-time) technique in the past, the continuous time circuitry is more suitable for today’s growing bandwidth applications. The thesis presents the implementation of a ΔΣ modulator with continuous-time techniques. Different numbers of digital delay in the ΔΣ feedback loop have been analyzed based on mathematic theorems in detail. The chip is designed with 1.8V power supply by using 0.18μm TSMC CMOS process, with power consumption 6.5mW and the core area 0.05mm2. The simulation result shows that the ADC achieves a 62dB peak signal-to-noise pulse distortion ratio (Peak-SNDR) within a 2MHz bandwidth with a sampling rate of 100MHz
Salih, Murat. "Closed-loop joint code delay synchronization and carrier phase recovery for direct-sequence spread spectrum systems". 1996. https://scholarworks.umass.edu/dissertations/AAI9619432.
Texto completoKnippschild, Clemens Laermann Martin. "Development and implementation of a torque compensation strategy for Lean NOx Trap systems using closed-loop feedback control /". 2007. http://www.gbv.de/dms/ilmenau/abs/543896900knipp.txt.
Texto completoJiang, Bo-Qian y 姜柏阡. "A 6 Gbps Delay-Locked-Loop-Based Clock and Data Recovery Circuit with an Infinite Phase Compensation Technique". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/84813177936174575945.
Texto completo國立中央大學
電機工程學系
101
In recent year, according to the rapid evolution of process and computer network development, the various bandwidth requirement such as short distance like chip-to-chip communication and long distance like fiber-optic communication is increased. The use of serial data transmission substitute for the parallel one. The serial data transmission are widely used for bus in computer such as PCI-Express, SATA, USB, and used for fiber-optic network like SONET. Most of these systems adopted the serial link architecture and operate at gigahertz. This study presents a clock and data recovery (CDR), and takes SATA 6 Gbps specification as reference material. The CDR employs the Delay-Locked Loop (DLL) as data recovery (DR) loop which consists of two sets of complementary voltage-controlled delay line (VCDL). It can solve the problem of delay range limitation. This study presents the CDR circuit fabricated in a 90-nm CMOS process. The dual-loop-based CDR consists of a phase-locked loop (PLL) and a DR loop. Unlike the commonly used PLL-based CDR, the bandwidth for the clock jitter suppression and the specific jitter transfer function (JTF) could be optimized through the PLL and DR loop, respectively. With regard to the DR loop, the DLL could be used for the phase alignment between the input data and the clock signal. However, once the input data accompanies the frequency offset, the DLL may suffer from the limitation of the finite phase tracking range, resulting in the erroneous function. Thus, this study proposes a infinitely phase-compensated DLL (IPDLL), which correlates and swaps the two complementary VCDL if necessary. The IPDLL-based CDR generates the continuous clock phase shifts for data tracking to resolve the operating range limitation of the convenient DLL control scheme. In addition, it exhibits the fast-locking, jitter-peaking-, and jitter-accumulation-free characteristic. As a result, in terms of the CDR setting, conforming that the gain of error signal E(s) of -3 dB lies at the jitter frequency of 4.2±2.1 MHz, the 6-Gb/s input data is simulated with the 3-nH wire bonding, and the RMS and peak-to-peak jitter of the recovered clock are 1.73 ps and 7.77ps, respectively. The chip core area of DR and PLL occupy 0.11 and 0.045 mm2, respectively. The total power consumption is around 79.8 mW at supply of 1.2V.
Tze-YuYu y 余澤佑. "Novel Decentralized Iterative Learning Trackers for the Unknown Sampled-data Interconnected Large-scale State-delay System with Closed-loop Decoupling Property". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/53401450619542839353.
Texto completo國立成功大學
電機工程學系碩博士班
98
The decentralized iterative learning trackers for the unknown sampled-data interconnected large-scale state-delay system consisting of multi-input multi-output subsystems with the closed-loop decoupling property is proposed in this thesis. The off-line observer/Kalman filter identification (OKID) method is used to obtain the decentralized linear models for subsystems in the interconnected large-scale system. In order to get over the effect of modeling error on the identified linear model of each subsystem, an improved observer with the high-gain property based on the digital redesign approach is developed to replace the observer identified by OKID. Then, iterative learning control (ILC) scheme is embedded to the decentralized models. Notice that the convergence of ILC is directly influenced by the initial control input. To accelerate the convergence of ILC, the digital-redesign linear quadratic tracker with the high-gain property is proposed as the initial control input of ILC. The high-gain property controllers can suppress the uncertain errors such as modeling errors, nonlinear perturbations, and external disturbances. Thus, the system output can quickly and accurately track the desired reference in a short time interval with the closed-loop decoupling property.
Wei-CinLiao y 廖偉欽. "Modeling of Decentralized Linear Observers and Trackers for the Unknown Sampled-data Interconnected Large-scale Linear Singular System with Time Delay and Closed-loop Decoupling Property". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/47307280640538143658.
Texto completo國立成功大學
電機工程學系碩博士班
98
Modeling of decentralized linear observers and trackers for the unknown sampled-data interconnected large-scale linear singular system with time delay and closed-loop decoupling property is proposed in this thesis. Through the off-line observer / Kalman filter identification (OKID), the appropriate (low-) order decentralized linear observers with direct transmission terms from input to output for the unknown sampled-data interconnected large-scale linear singular system with time delay are determined. Then, the high-gain linear quadratic suboptimal analogue observer and tracker are proposed based on the each decentralized equivalent regular system with a direct transmission term from input to output. Subsequently, the prediction-based digital redesign method is utilized to obtain practically implemental digital observer and tracker for the sample-data system. With the high-gain property, the decentralized digital-redesign trackers have the decoupling property for the closed-loop interconnected system. Finally, appropriate weighting of the each decentralized observer can be obtained to improve the performance of observer-based tracker by the evolutionary programming (EP).
Yi-HsuanChen y 陳毅玹. "Decentralized Modeling and Linear Observers/Input Constraint Trackers for a More General Class of Unknown Large-scale Interconnected Sampled-data Linear Systems with State Delay and Closed-loop Decoupling Property". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/06494754449861473514.
Texto completo國立成功大學
電機工程學系碩博士班
98
Decentralized modeling and linear observers/input constraint trackers for a more general class of unknown large-scale interconnected sampled-data linear systems with state delay and closed-loop decoupling property are proposed in this thesis. First, the off-line observer/Kalman filter identification (OKID) method is used to determine the appropriate (low-) order decentralized linear observers for the unknown large-scale interconnected sampled-data linear system with state delay. Then, a digital redesign approach with the high-gain property is applied to overcome the modeling error of the above observer effectively. Moreover, a digital-redesign observer-based linear quadratic digital tracker with high-gain property for the sampled-data system is presented, and it provides high performance on trajectory tracking with the closed-loop decoupling property. Finally, to reduce the magnitude of control input, which is caused by the high gain property to fit the requirement of the input constraint, the modified linear quadratic digital tracker (LQDT) is proposed. And the control input can be compressed effectively without losing the original high performance of tracking much.
Heidari, Abdorreza. "Utilizing Channel State Information for Enhancement of Wireless Communication Systems". Thesis, 2007. http://hdl.handle.net/10012/3413.
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