subject:(loop shaping)

NSYSU

1. Huang, Yan-Chuen. An H-infinite Based Sensitivity Function Shaping Method.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2002, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724102-203013

► Abstract This thesis presents that the closed-loop sensitivity function shaping combined with -synthesis applies to design the controller with structured uncertainties. The sensitivity function shaping… (more)

Subjects/Keywords: Mu-synthesis; Loop Shaping; Sensitivity Function Shaping

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APA (6^th Edition):

Huang, Y. (2002). An H-infinite Based Sensitivity Function Shaping Method. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724102-203013

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huang, Yan-Chuen. “An H-infinite Based Sensitivity Function Shaping Method.” 2002. Thesis, NSYSU. Accessed April 16, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724102-203013.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huang, Yan-Chuen. “An H-infinite Based Sensitivity Function Shaping Method.” 2002. Web. 16 Apr 2021.

Vancouver:

Huang Y. An H-infinite Based Sensitivity Function Shaping Method. [Internet] [Thesis]. NSYSU; 2002. [cited 2021 Apr 16]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724102-203013.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huang Y. An H-infinite Based Sensitivity Function Shaping Method. [Thesis]. NSYSU; 2002. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724102-203013

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

2. Osinuga, Mobolaji. Weight optimization in H∞ loop-shaping control and applications.

Degree: PhD, 2012, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/weight-optimization-in-hinfinity-loopshaping-control-and-applications(58102c35-9a75-44af-9879-4f142ca4aa09).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564305

► The primary objective of this thesis is to leverage on the framework of H∞ loop-shaping control to formulate efficient and powerful optimization algorithms in LMI… (more)

▼ The primary objective of this thesis is to leverage on the framework of H∞ loop-shaping control to formulate efficient and powerful optimization algorithms in LMI framework for the synthesis of performance loop-shaping weights. The H∞ loop-shaping design procedure is an efficient controller synthesis technique that combines classical loop-shaping concepts with H∞ synthesis. This procedure establishes a good tradeoff between robust stability and robust performance of a closed-loop system in a systematic manner. However, the selection of pre- and/or post-compensators, a crucial step in the design procedure, is nontrivial as factors such as the right half plane poles/zeros of the nominal plant, roll-off rate around the crossover frequency, strength of cross-coupling in multi-input multi-output systems, expected bandwidth, etc. must be adequately considered.Firstly, a frequency-dependent weight optimization framework is formulated in state-space form in order to remove the dependency on frequency while retaining the objective of maximizing the robust stability margin of a closed-loop system. This formulation facilitates the synthesis of low-order controllers, which is desirable from an implementation perspective.A weight optimization framework that incorporates smoothness constraints in order to prevent the cancellation of important modes of the system, for example, lightly damped poles/zeros of flexible structures, is subsequently formulated. The proposed formulation is intuitive from a design perspective as the smoothness constraints are expressed as gradient constraints on a log-log scale in dB/decade, consistent with the notation used in Bode plot for single-input single-output systems and singular value plots for multi-input multi-output systems.Thereafter, an optimization framework that maximizes the robust performance of a closed-loop system is presented. The philosophy in this framework is in line with practical design objectives that give the best achievable robust performance on a particular problem once a level of robust stability margin is demanded.Lastly, a novel unmanned vehicle is proposed. The vehicle uses a full six-degree-of-freedom tri-rotor actuation, capable of fully decoupled thrust and torque vectoring in all the 3D space. This vehicle can act as an unmanned ground vehicle or unmanned aerial vehicle, but the objective herein is restricted to the upright stability of the vehicle while operating on the ground as this is a precursor to rolling motion. The full nonlinear model of the vehicle is derived and linearized for subsequent controller synthesis, and this is thereafter validated by means of numerical simulations.

Subjects/Keywords: 006; H8 Loop-Shaping Control; Weight Synthesis; Robust Control; LMI; Unmanned Vehicle

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APA (6^th Edition):

Osinuga, M. (2012). Weight optimization in H∞ loop-shaping control and applications. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/weight-optimization-in-hinfinity-loopshaping-control-and-applications(58102c35-9a75-44af-9879-4f142ca4aa09).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564305

Chicago Manual of Style (16^th Edition):

Osinuga, Mobolaji. “Weight optimization in H∞ loop-shaping control and applications.” 2012. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. https://www.research.manchester.ac.uk/portal/en/theses/weight-optimization-in-hinfinity-loopshaping-control-and-applications(58102c35-9a75-44af-9879-4f142ca4aa09).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564305.

MLA Handbook (7^th Edition):

Osinuga, Mobolaji. “Weight optimization in H∞ loop-shaping control and applications.” 2012. Web. 16 Apr 2021.

Vancouver:

Osinuga M. Weight optimization in H∞ loop-shaping control and applications. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2021 Apr 16]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/weight-optimization-in-hinfinity-loopshaping-control-and-applications(58102c35-9a75-44af-9879-4f142ca4aa09).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564305.

Council of Science Editors:

Osinuga M. Weight optimization in H∞ loop-shaping control and applications. [Doctoral Dissertation]. University of Manchester; 2012. Available from: https://www.research.manchester.ac.uk/portal/en/theses/weight-optimization-in-hinfinity-loopshaping-control-and-applications(58102c35-9a75-44af-9879-4f142ca4aa09).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564305

Delft University of Technology

3. Chen, Linda (author). Development of CRONE reset control.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:5370c610-4112-49e9-b860-9d625d5b40c5

► In high-tech industry (sub)nanometre precision motion control is essential. For example wafer scanners, used for production of integrated circuits, have to provide (sub)nanometre precision positioning… (more)

▼ In high-tech industry (sub)nanometre precision motion control is essential. For example wafer scanners, used for production of integrated circuits, have to provide (sub)nanometre precision positioning whilst satisfying challenging requirements on speed at the same time. It is in demanding cases like this that different requirements begin to conflict with each other. A fundamental trade-off between robustness and performance exists as an inevitable result of the waterbed effect in linear control. PID controllers, which have been an industry-standard for many years, do not satisfy the ever increasing demands. In this MSc thesis a novel reset control synthesis method is proposed: CRONE reset control, which combines a robust fractional CRONE controller (Commande Robuste d’Ordre Non-Entier) with non-linear reset control to overcome waterbed effect. In CRONE control, robustness is achieved against gain deviations by creation of constant phase behaviour around bandwidth with the use of fractional operators. The use of fractional operators also introduces more freedom in shaping the open- loop frequency response, allowing fractional factors in Bode’s gain-phase relation. However, waterbed effect remains, which motivates introduction of non-linear reset control in the CRONE design. In reset control, controller states are reset when the error between output- and reference- signal is zero. In frequency domain, using describing function analysis it is predicted that reset filters generate less phase lag for similar gain behaviour. For instance, a reset integrator gives a phase lag of about 38 degrees, which is 52 degrees less compared to the linear integrator. This allows for relief from Bode’s gain-phase relation, breaking aforementioned trade-offs. In the new controller design, reset phase advantage is approximated using describing function analysis and used to achieve better open-loop shape. New design rules for CRONE reset control have been developed in this thesis. Three different reset control strategies have been investigated: integrator reset, lag reset and lead- lag/lag-lead reset. For these controllers, a two-degree-of-freedom non-linearity tuning CRONE reset control structure has been developed. This control structure has been implemented digitally within a MATLAB/Simulink environment on a Lorentz-actuated (dual) precision stage via a real-time dSPACE DS1103 controller interface. For the implemented controllers sufficient quadratic stability has been shown using the Hβ-condition. It has been shown that simulated frequency responses using describing function correspond well to experimental identified frequency responses. Moreover, frequency domain measurements have shown that better performance for CRONE reset control can be achieved for same phase margin compared to linear CRONE. Relief from both waterbed effect and Bode’s gain-phase relation has been accomplished. Furthermore, for the same bandwidth, average noise reduction between 1.79dB and 3.93dB has been attained at a number of distinct… Advisors/Committee Members: Saikumar, Niranjan (mentor), Hossein Nia Kani, Hassan (mentor), Baldi, Simone (mentor), van Wingerden, Jan-Willem (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: reset control; describing function analysis; loop shaping; fractional order control; CRONE; robust control; precision positioning

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APA (6^th Edition):

Chen, L. (. (2017). Development of CRONE reset control. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:5370c610-4112-49e9-b860-9d625d5b40c5

Chicago Manual of Style (16^th Edition):

Chen, Linda (author). “Development of CRONE reset control.” 2017. Masters Thesis, Delft University of Technology. Accessed April 16, 2021. http://resolver.tudelft.nl/uuid:5370c610-4112-49e9-b860-9d625d5b40c5.

MLA Handbook (7^th Edition):

Chen, Linda (author). “Development of CRONE reset control.” 2017. Web. 16 Apr 2021.

Vancouver:

Chen L(. Development of CRONE reset control. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 16]. Available from: http://resolver.tudelft.nl/uuid:5370c610-4112-49e9-b860-9d625d5b40c5.

Council of Science Editors:

Chen L(. Development of CRONE reset control. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:5370c610-4112-49e9-b860-9d625d5b40c5

4. Ikonen, Pekka. Artificial Electromagnetic Composite Structures in Selected Microwave Applications.

Degree: 2007, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2007/isbn9789512286775/

►

Possible performance enhancement of selected microwave applications is studied using artificial electromagnetic composite structures. The following definition is adopted for artificial electromagnetic composites: If we… (more)

▼

Possible performance enhancement of selected microwave applications is studied using artificial electromagnetic composite structures. The following definition is adopted for artificial electromagnetic composites: If we combine two or more materials (e.g., embed metal inclusions in a dielectric matrix) to produce another material (effectively behaving as another dielectric or artificial magnetic material), this material is an artificial electromagnetic composite. By varying the inclusions and their position relative to each other it is possible to synthesize a wide variety of macroscopic material properties. Even properties that do not exist in the class of "conventional" or "natural" materials can be achieved with sophisticated design methods. This extended range of available material characteristics, or the possibility to synthesize "conventional characteristics" with more simple and cheap means, offers a new design dimension for microwave engineers. In this thesis the focus lies in two subclasses of artificial electromagnetic composites: 1) Artificial magnetic composites; 2) Artificial dielectric composites. Most of the artificial magnetic composites considered in this work consist of periodically arranged, electrically small broken loops. The circulating currents induced to a large set of inclusions give rise to macroscopic effective permeability that exceeds unity under proper circumstances. Fundamental properties of artificial magnetic composites are studied, and the possibilities to utilize these composites as microstrip antenna substrates are explored. The obtained results indicate that artificial magnetic substrates containing only non-magnetic constituents offer no advantages in antenna miniaturization. Artificial dielectric composites considered in this work are implemented using periodical lattices of thin conducting wires, possibly loaded with a reactive distributed impedance. The main features of so called wire medium and loaded wire medium are reviewed. Later such composites are used as artificial material for a beam shaping element in base station antenna applications. We also study plane-wave transmission through finite thickness slabs implemented using a periodical arrangement of metal wires and broken loops, and extend the vector circuit theory, previously introduced for isotropic and chiral slabs, to uniaxial and spatially dispersive magneto-dielectric slabs. Finally, the recently proposed theory of sub-wavelength field channeling is experimentally validated.

Tässä työssä tutkitaan eräiden mikroaaltosovellusten toiminnan parantamista hyödyntäen keinotekoisia sähkömagneettisia komposiittimateriaaleja. Työssä omaksutaan seuraava määritelmä keinotekoisille sähkömagneettisille komposiiteille: Jos yhdistetään kaksi materiaalia (esim. sekoitetaan metallikappaleita vaahtomuoviin) tarkoituksena aikaansaada uusi materiaali (joka toimii tehollisesti uudenlaisena dielektrisenä tai keinotekoisena magneettisena materiaalina), tämä uusi materiaali on keinotekoinen sähkömagneettinen komposiittimateriaali.…

Advisors/Committee Members: Helsinki University of Technology, Department of Electrical and Communications Engineering, Radio Laboratory.

Subjects/Keywords: broken loop; antenna miniaturization; wire medium; beam shaping; vector circuit; near field channeling; antennien miniaturisointi; lankahilasto; säteilykeilan muokkaus; vektoripiiri; lähikentän kanavoituminen

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ikonen, P. (2007). Artificial Electromagnetic Composite Structures in Selected Microwave Applications. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2007/isbn9789512286775/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ikonen, Pekka. “Artificial Electromagnetic Composite Structures in Selected Microwave Applications.” 2007. Thesis, Helsinki University of Technology. Accessed April 16, 2021. http://lib.tkk.fi/Diss/2007/isbn9789512286775/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ikonen, Pekka. “Artificial Electromagnetic Composite Structures in Selected Microwave Applications.” 2007. Web. 16 Apr 2021.

Vancouver:

Ikonen P. Artificial Electromagnetic Composite Structures in Selected Microwave Applications. [Internet] [Thesis]. Helsinki University of Technology; 2007. [cited 2021 Apr 16]. Available from: http://lib.tkk.fi/Diss/2007/isbn9789512286775/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ikonen P. Artificial Electromagnetic Composite Structures in Selected Microwave Applications. [Thesis]. Helsinki University of Technology; 2007. Available from: http://lib.tkk.fi/Diss/2007/isbn9789512286775/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Berkeley

5. CHEN, XU. Adaptive Local Loop Shaping and Inverse-based Youla-Kucera Parameterization with Application to Precision Control.

Degree: Mechanical Engineering, 2013, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/350170gc

► In this dissertation we discuss loop-shaping algorithms that bring enhanced servo performance at multiple local frequency regions. These local loop shaping (LLS) algorithms are motivated… (more)

▼ In this dissertation we discuss loop-shaping algorithms that bring enhanced servo performance at multiple local frequency regions. These local loop shaping (LLS) algorithms are motivated by several new demands in practical control systems such as hard disk drives in information storage industry, wafer scanners in semiconductor manufacturing, active steering in automotive vehicles, and active suspension in structural vibration rejection. We will examine how knowledge about the disturbance/reference characteristics can be utilized, both offline and online, to customize the servo system for meeting the control challenges.Along the way, we investigate several design concepts and methodologies. First, in Youla-Kucera (YK) parameterization – the parameterization of all stabilizing linear controllers – we develop plant factorizations based on selective model inversion, which safely inverts a (possibly nonminimum-phase) plant dynamics, using H infinity minimization and pole/zero modulation. This allows us to obtain a simplified YK algorithm with strong design and tuning intuitions in practical servo. Also, with selective model inversion, it becomes quite approachable to control the waterbed effect, the result of Bode's Integral Formula in fundamental limitations of linear control design. This is achieved by utilizing add-on pole/zero placement and convex-optimization approaches to minimize the disturbance amplification in the sensitivity function, which enables the obtaining of several algorithms for enhanced repetitive control and vibration rejection. In the third part of the dissertation, we investigate adaptive formulations to achieve online identification of the disturbance characteristics. We study the application of infinite-impulse-response (IIR) filters in YK parameterization, which brings benefits such as minimum-parameter adaptation and better convergence under noisy adaptation environments. We also provide an optimization-based approach to address the problem of robust strict positive real transfer functions, an essential requirement in adaptive control and system identification.The discussed algorithms are then extended from the control of SISO to MISO (multi-input-single-output) plants, where we formulate a decoupled disturbance observer for estimating the equivalent input disturbance for different actuators in a MISO system.Simulation and experimental results are obtained on the four classes of systems discussed at the beginning of this abstract. Parts of the results are performed on benchmark problems, and compared with the algorithms of peer researchers under extensive test conditions.

Subjects/Keywords: Mechanical engineering; Electrical engineering; Adaptive Vibration Rejection; Local Loop Shaping; Model Inverse; Precision Control; Youla-Kucera Parameterization; Youla Parameterization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

CHEN, X. (2013). Adaptive Local Loop Shaping and Inverse-based Youla-Kucera Parameterization with Application to Precision Control. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/350170gc

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

CHEN, XU. “Adaptive Local Loop Shaping and Inverse-based Youla-Kucera Parameterization with Application to Precision Control.” 2013. Thesis, University of California – Berkeley. Accessed April 16, 2021. http://www.escholarship.org/uc/item/350170gc.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

CHEN, XU. “Adaptive Local Loop Shaping and Inverse-based Youla-Kucera Parameterization with Application to Precision Control.” 2013. Web. 16 Apr 2021.

Vancouver:

CHEN X. Adaptive Local Loop Shaping and Inverse-based Youla-Kucera Parameterization with Application to Precision Control. [Internet] [Thesis]. University of California – Berkeley; 2013. [cited 2021 Apr 16]. Available from: http://www.escholarship.org/uc/item/350170gc.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

CHEN X. Adaptive Local Loop Shaping and Inverse-based Youla-Kucera Parameterization with Application to Precision Control. [Thesis]. University of California – Berkeley; 2013. Available from: http://www.escholarship.org/uc/item/350170gc

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

6. Crepy-Marglais, Jean-Daniel (author). Development of a Robust and Combined Controller for On-Orbit Servicing Missions.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:f163745c-e9d9-4b22-9e5b-1f4d3790ebf6

►

Nowadays, a satellite is considered as out of range forever once it is launched. This may soon no longer hold thanks to on-orbit servicing. However,… (more)

Subjects/Keywords: space robotics; on-orbit servicing; Control; H-infinity control; Attitude control; Robotics; loop shaping; combined control; robust control

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Crepy-Marglais, J. (. (2018). Development of a Robust and Combined Controller for On-Orbit Servicing Missions. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f163745c-e9d9-4b22-9e5b-1f4d3790ebf6

Chicago Manual of Style (16^th Edition):

Crepy-Marglais, Jean-Daniel (author). “Development of a Robust and Combined Controller for On-Orbit Servicing Missions.” 2018. Masters Thesis, Delft University of Technology. Accessed April 16, 2021. http://resolver.tudelft.nl/uuid:f163745c-e9d9-4b22-9e5b-1f4d3790ebf6.

MLA Handbook (7^th Edition):

Crepy-Marglais, Jean-Daniel (author). “Development of a Robust and Combined Controller for On-Orbit Servicing Missions.” 2018. Web. 16 Apr 2021.

Vancouver:

Crepy-Marglais J(. Development of a Robust and Combined Controller for On-Orbit Servicing Missions. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Apr 16]. Available from: http://resolver.tudelft.nl/uuid:f163745c-e9d9-4b22-9e5b-1f4d3790ebf6.

Council of Science Editors:

Crepy-Marglais J(. Development of a Robust and Combined Controller for On-Orbit Servicing Missions. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:f163745c-e9d9-4b22-9e5b-1f4d3790ebf6

University of Washington

7. Wang, Dan. Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing.

Degree: PhD, 2021, University of Washington

URL: http://hdl.handle.net/1773/46839

► A high-precision additive manufacturing process, laser powder bed fusion (LPBF) has enabled unmatched agile manufacturing of a wide range of products from engine components to… (more)

▼ A high-precision additive manufacturing process, laser powder bed fusion (LPBF) has enabled unmatched agile manufacturing of a wide range of products from engine components to medical implants. While finite element modeling and closed-loop control have been identified key for predicting and engineering part qualities in LPBF, existing results in each realm are developed in opposite computational architectures wildly different in time scale. This dissertation builds a first-instance closed-loop simulation framework by integrating high-fidelity finite element modeling with feedback controls originally developed for general mechatronics systems. By utilizing the output signals (e.g., melt pool width) retrieved from the finite element model (FEM) to directly update the control signals (e.g., laser power) sent to the model, the proposed closed-loop framework enables testing the limits of advanced controls in LPBF and surveying the parameter space fully to generate more predictable part qualities. Along the course of formulating the framework, we build and refine an FEM of the thermal response in LPBF and verify the FEM by comparing its results with experimental and analytical solutions. Thereafter, we use the FEM to understand the melt-pool evolution induced by the thermomechanical interactions in LPBF. In addition, we build a new Hammerstein mixed-fidelity model to capture more of the complex spatiotemporal thermal dynamics. Under the architecture of the closed-loop simulation, we discuss general loop-shaping algorithms and specifically develop a multirate fractional-order repetitive control (RC) algorithm that addresses an intrinsic RC limitation when the exogenous signal frequency cannot divide the sampling frequency of the sensor. We also investigate the model inversion techniques – an important piece of the loop-shaping control – and build an H_∞-based optimal inversion that attains model accuracy at the frequency regions of interest while constraining noise amplification elsewhere to guarantee system robustness. Besides, we analyze spectral properties of the closed-loop signals under sample-data control and show that the single-rate high-gain feedback cannot reject disturbances near and beyond the Nyquist frequency. From there, we provide a case study on applying an RC algorithm to greatly attenuate periodic thermal variations in LPBF. Advisors/Committee Members: Chen, Xu (advisor).

Subjects/Keywords: finite element model; loop-shaping control; model inversion; powder bed fusion; repetitive control; Mechanical engineering; Mechanical engineering

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APA (6^th Edition):

Wang, D. (2021). Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/46839

Chicago Manual of Style (16^th Edition):

Wang, Dan. “Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing.” 2021. Doctoral Dissertation, University of Washington. Accessed April 16, 2021. http://hdl.handle.net/1773/46839.

MLA Handbook (7^th Edition):

Wang, Dan. “Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing.” 2021. Web. 16 Apr 2021.

Vancouver:

Wang D. Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing. [Internet] [Doctoral dissertation]. University of Washington; 2021. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/1773/46839.

Council of Science Editors:

Wang D. Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing. [Doctoral Dissertation]. University of Washington; 2021. Available from: http://hdl.handle.net/1773/46839

8. Hirwa, Serge. Méthodes de commande avancées appliquées aux viseurs. : Line of sight stabilization using advanced control techniques.

Degree: Docteur es, Automatique (STIC), 2013, Supélec

URL: http://www.theses.fr/2013SUPL0022

►

La stabilisation inertielle de ligne de visée est essentiellement un problème de rejet de perturbations : il faut rendre la ligne de visée de la… (more)

▼

La stabilisation inertielle de ligne de visée est essentiellement un problème de rejet de perturbations : il faut rendre la ligne de visée de la caméra embarquée dans le viseur insensible aux mouvements du porteur. Les méthodes de commande robuste du type H-infini sont bien adaptées à la résolution de ce type de problème, et plus particulièrement l’approche Loop-Shaping qui repose sur des concepts de réglage de l’automatique fréquentielle classique. Cependant, les correcteurs obtenus via cette approche sont généralement d’ordre élevé et donc difficilement implémentables sur le calculateur embarqué du viseur.Dans cette thèse, nous avons proposé des méthodologies de synthèse de correcteurs robustes d’ordre réduit et/ou de structure fixée. Pour cela, nos travaux ont été axés sur :- L’optimisation pour la synthèse H-infini à ordre et/ou structure fixée. Tout d’abord nous avons exploré les possibilités offertes par l’optimisation sous contraintes LMI (Linear Matrix Inequalities). Celles-ci se sont avérées limitées, bien que de nombreux algorithmes aient été proposés dans ce cadre depuis le début des années 90. Ensuite, nous avons opté pour l’optimisation non lisse. En effet des outils numériques récemment développés rendent accessible cette approche, et leur efficacité s’est avéré indéniable.- L’adaptation au cadre particulier du critère H-infini Loop-Shaping.La structure particulière de ce critère de synthèse a été exploitée afin de mieux prendre en compte les pondérations, et d’améliorer la réduction d’ordre du correcteur final. Enfin, une approche basée uniquement sur le réglage graphique d’un gabarit de gain fréquentiel en boucle ouverte est proposée. Ces différentes méthodologies sont illustrées, tout au long de la thèse, sur un viseur dont le modèle a été identifié à partir de mesures expérimentales.

Inertial line of sight stabilization is a disturbance rejection problem: the goal is to hold steady in the inertial space, the line of sight of a camera, which is carried on a mobile vehicle. H-infinity robust control techniques are well suited for this type of problem, in particular the Loop-Shaping approach which relies on classical frequency domain concepts. However, this approach results in high order controllers which are hardly implementable on the real time embedded electronic unit of the sight system.In this thesis, fixed order and fixed structure controller design methodologies are proposed. This development follows two main axis: - Fixed order H-infinity Optimization. First, fixed order controllers have been investigated through the LMI (Linear Matrix Inequalities) optimization framework. However the numerical efficiency of this approach is still limited, despite the large amount of research in this area since the 90’s. Then, we used recently developed and more efficient tools that recast the fixed order H-infinity synthesis problem as a nonsmooth optimization problem.- Adaptation to the H-infinity Loop-Shaping frameworkWe adapted the 4 block H-infinity criterion in order to include the weighting filters in…

Advisors/Committee Members: Duc, Gilles (thesis director).

Subjects/Keywords: Stabilisation inertielle de ligne de visée; Rejet de perturbation; Robustesse; H-infini Loop-Shaping; Correcteurs d’ordre réduit; Inertial line of sight stabilization; Disturbance rejection; Robustness; H-infinity Loop-Shaping; Reduced order controllers; 378.242

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APA (6^th Edition):

Hirwa, S. (2013). Méthodes de commande avancées appliquées aux viseurs. : Line of sight stabilization using advanced control techniques. (Doctoral Dissertation). Supélec. Retrieved from http://www.theses.fr/2013SUPL0022

Chicago Manual of Style (16^th Edition):

Hirwa, Serge. “Méthodes de commande avancées appliquées aux viseurs. : Line of sight stabilization using advanced control techniques.” 2013. Doctoral Dissertation, Supélec. Accessed April 16, 2021. http://www.theses.fr/2013SUPL0022.

MLA Handbook (7^th Edition):

Hirwa, Serge. “Méthodes de commande avancées appliquées aux viseurs. : Line of sight stabilization using advanced control techniques.” 2013. Web. 16 Apr 2021.

Vancouver:

Hirwa S. Méthodes de commande avancées appliquées aux viseurs. : Line of sight stabilization using advanced control techniques. [Internet] [Doctoral dissertation]. Supélec; 2013. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2013SUPL0022.

Council of Science Editors:

Hirwa S. Méthodes de commande avancées appliquées aux viseurs. : Line of sight stabilization using advanced control techniques. [Doctoral Dissertation]. Supélec; 2013. Available from: http://www.theses.fr/2013SUPL0022

NSYSU

9. Li, Chien-Te. Robust Controllers Design by Loop Shaping Approach.

Degree: Master, Mechanical Engineering, 2001, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903101-192046

► This thesis mainly proposes a new method to design Hinf Loop Shaping Robust Controller by choosing Weighting Function. In the paper, the author first introduces… (more)

Subjects/Keywords: robust stability; loop shaping; robust performance; robust control; weighting function

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APA (6^th Edition):

Li, C. (2001). Robust Controllers Design by Loop Shaping Approach. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903101-192046

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Chien-Te. “Robust Controllers Design by Loop Shaping Approach.” 2001. Thesis, NSYSU. Accessed April 16, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903101-192046.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Chien-Te. “Robust Controllers Design by Loop Shaping Approach.” 2001. Web. 16 Apr 2021.

Vancouver:

Li C. Robust Controllers Design by Loop Shaping Approach. [Internet] [Thesis]. NSYSU; 2001. [cited 2021 Apr 16]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903101-192046.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li C. Robust Controllers Design by Loop Shaping Approach. [Thesis]. NSYSU; 2001. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0903101-192046

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

10. Chen, Rong-Chih. Hâ Loop-shaping design for Focusing/Seeking controllers of Optical disk drives.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2002, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723102-161611

► This paper presents the results of servo designs for optical disk drives which consist of a dual-input/single-output (DISO) actuator; both a sledge actuator and a… (more)

Subjects/Keywords: seeking servo; dual-actuator; Hâ loop-shaping control; focusing servo; CD-drives

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APA (6^th Edition):

Chen, R. (2002). Hâ Loop-shaping design for Focusing/Seeking controllers of Optical disk drives. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723102-161611

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Rong-Chih. “Hâ Loop-shaping design for Focusing/Seeking controllers of Optical disk drives.” 2002. Thesis, NSYSU. Accessed April 16, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723102-161611.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Rong-Chih. “Hâ Loop-shaping design for Focusing/Seeking controllers of Optical disk drives.” 2002. Web. 16 Apr 2021.

Vancouver:

Chen R. Hâ Loop-shaping design for Focusing/Seeking controllers of Optical disk drives. [Internet] [Thesis]. NSYSU; 2002. [cited 2021 Apr 16]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723102-161611.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen R. Hâ Loop-shaping design for Focusing/Seeking controllers of Optical disk drives. [Thesis]. NSYSU; 2002. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723102-161611

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

San Jose State University

11. Lu, Long. Utilization of Differential Thrust for Lateral/Directional Stability of a Commercial Aircraft with a Damaged Vertical Stabilizer.

Degree: MS, Aerospace Engineering, 2015, San Jose State University

URL: https://doi.org/10.31979/etd.4ys8-zqt7 ; https://scholarworks.sjsu.edu/etd_theses/4649

► This thesis investigates the utilization of differential thrust to help a commercial aircraft with a damaged vertical stabilizer regain its lateral/directional stability. In the… (more)

Subjects/Keywords: Damaged vertical stabilizer; Differential thrust; H-infinity loop-shaping based robust control systems; Lateral/directional stability; Linear quadratic regulator; Model reference adaptive systems

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APA (6^th Edition):

Lu, L. (2015). Utilization of Differential Thrust for Lateral/Directional Stability of a Commercial Aircraft with a Damaged Vertical Stabilizer. (Masters Thesis). San Jose State University. Retrieved from https://doi.org/10.31979/etd.4ys8-zqt7 ; https://scholarworks.sjsu.edu/etd_theses/4649

Chicago Manual of Style (16^th Edition):

Lu, Long. “Utilization of Differential Thrust for Lateral/Directional Stability of a Commercial Aircraft with a Damaged Vertical Stabilizer.” 2015. Masters Thesis, San Jose State University. Accessed April 16, 2021. https://doi.org/10.31979/etd.4ys8-zqt7 ; https://scholarworks.sjsu.edu/etd_theses/4649.

MLA Handbook (7^th Edition):

Lu, Long. “Utilization of Differential Thrust for Lateral/Directional Stability of a Commercial Aircraft with a Damaged Vertical Stabilizer.” 2015. Web. 16 Apr 2021.

Vancouver:

Lu L. Utilization of Differential Thrust for Lateral/Directional Stability of a Commercial Aircraft with a Damaged Vertical Stabilizer. [Internet] [Masters thesis]. San Jose State University; 2015. [cited 2021 Apr 16]. Available from: https://doi.org/10.31979/etd.4ys8-zqt7 ; https://scholarworks.sjsu.edu/etd_theses/4649.

Council of Science Editors:

Lu L. Utilization of Differential Thrust for Lateral/Directional Stability of a Commercial Aircraft with a Damaged Vertical Stabilizer. [Masters Thesis]. San Jose State University; 2015. Available from: https://doi.org/10.31979/etd.4ys8-zqt7 ; https://scholarworks.sjsu.edu/etd_theses/4649

University of Michigan

12. Weyer, Daniel. Design of Digital FMCW Chirp Synthesizer PLLs Using Continuous-Time Delta-Sigma Time-to-Digital Converters.

Degree: PhD, Electrical Engineering, 2018, University of Michigan

URL: http://hdl.handle.net/2027.42/147732

► Radar applications for driver assistance systems and autonomous vehicles have spurred the development of frequency-modulated continuous-wave (FMCW) radar. Continuous signal transmission and high operation frequencies… (more)

▼ Radar applications for driver assistance systems and autonomous vehicles have spurred the development of frequency-modulated continuous-wave (FMCW) radar. Continuous signal transmission and high operation frequencies in the K- and W-bands enable radar systems with low power consumption and small form factors. The radar performance depends on high-quality signal sources for chirp generation to ensure accurate and reliable target detection, requiring chirp synthesizers that offer fast frequency settling and low phase noise. Fractional-N phase locked loops (PLLs) are an effective tool for synthesis of FMCW waveform profiles, and advances in CMOS technology have enabled high-performance single-chip CMOS synthesizers for FMCW radar. Design approaches for FMCW chirp synthesizer PLLs need to address the conflicting requirements of fast settling and low close-in phase noise. While integrated PLLs can be implemented as analog or digital PLLs, analog PLLs still dominate for high frequencies. Digital PLLs offer greater programmability and area efficiency than their analog counterparts, but rely on high-resolution time-to-digital converters (TDCs) for low close-in phase noise. Performance limitations of conventional TDCs remain a roadblock for achieving low phase noise with high-frequency digital PLLs. This shortcoming of digital PLLs becomes even more pronounced with wide loop bandwidths as required for FMCW radar. To address this problem, this work presents digital FMCW chirp synthesizer PLLs using continuous-time delta-sigma TDCs. After a discussion of the requirements for PLL-based FMCW chirp synthesizers, this dissertation focuses on digital fractional-N PLL designs based on noise-shaping TDCs that leverage state-of-the-art delta-sigma modulator techniques to achieve low close-in phase noise in wide-bandwidth digital PLLs. First, an analysis of the PLL bandwidth and chirp linearity studies the design requirements for chirp synthesizer PLLs. Based on a model of a complete radar system, the analysis examines the impact of the PLL bandwidth on the radar performance. The modeling approach allows for a straightforward study of the radar accuracy and reliability as functions of the chirp parameters and the PLL configuration. Next, an 18-to-22GHz chirp synthesizer PLL that produces a 25-segment chirp for a 240GHz FMCW radar application is described. This synthesizer design adapts an existing third-order noise-shaping TDC design. A 65nm CMOS prototype achieves a measured close-in phase noise of -88dBc/Hz at 100kHz offset for wide PLL bandwidths and consumes 39.6mW. The prototype drives a radar testbed to demonstrate the effectiveness of the synthesizer design in a complete radar system. Finally, a second-order noise-shaping TDC based on a fourth-order bandpass delta-sigma modulator is introduced. This bandpass delta-sigma TDC leverages the high resolution of a bandpass delta-sigma modulator by sampling a sinusoidal PLL reference and applies digital down-conversion to achieve low TDC noise in the frequency band of interest. Based on… Advisors/Committee Members: Flynn, Michael (committee member), He, Zhong (committee member), Wentzloff, David D (committee member), Zhang, Zhengya (committee member).

Subjects/Keywords: chirp synthesizer; digital fractional-N PLL; frequency-modulated continuous-wave (FMCW) radar; noise shaping; phase locked loop (PLL); time-to-digital converter (TDC); Electrical Engineering; Engineering

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APA (6^th Edition):

Weyer, D. (2018). Design of Digital FMCW Chirp Synthesizer PLLs Using Continuous-Time Delta-Sigma Time-to-Digital Converters. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/147732

Chicago Manual of Style (16^th Edition):

Weyer, Daniel. “Design of Digital FMCW Chirp Synthesizer PLLs Using Continuous-Time Delta-Sigma Time-to-Digital Converters.” 2018. Doctoral Dissertation, University of Michigan. Accessed April 16, 2021. http://hdl.handle.net/2027.42/147732.

MLA Handbook (7^th Edition):

Weyer, Daniel. “Design of Digital FMCW Chirp Synthesizer PLLs Using Continuous-Time Delta-Sigma Time-to-Digital Converters.” 2018. Web. 16 Apr 2021.

Vancouver:

Weyer D. Design of Digital FMCW Chirp Synthesizer PLLs Using Continuous-Time Delta-Sigma Time-to-Digital Converters. [Internet] [Doctoral dissertation]. University of Michigan; 2018. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/2027.42/147732.

Council of Science Editors:

Weyer D. Design of Digital FMCW Chirp Synthesizer PLLs Using Continuous-Time Delta-Sigma Time-to-Digital Converters. [Doctoral Dissertation]. University of Michigan; 2018. Available from: http://hdl.handle.net/2027.42/147732

Linköping University

13. Johansson, Henrik. Gain Scheduled Missile Control Using Robust Loop Shaping.

Degree: Electrical Engineering, 2002, Linköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1529

► Robust control design has become a major research area during the last twenty years and there are nowadays several robust design methods available. One… (more)

Subjects/Keywords: Reglerteknik; Missile Control; Robust Loop Shaping; Gain Scheduling; Reglerteknik; Automatic control; Reglerteknik

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APA (6^th Edition):

Johansson, H. (2002). Gain Scheduled Missile Control Using Robust Loop Shaping. (Thesis). Linköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1529

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Johansson, Henrik. “Gain Scheduled Missile Control Using Robust Loop Shaping.” 2002. Thesis, Linköping University. Accessed April 16, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1529.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Johansson, Henrik. “Gain Scheduled Missile Control Using Robust Loop Shaping.” 2002. Web. 16 Apr 2021.

Vancouver:

Johansson H. Gain Scheduled Missile Control Using Robust Loop Shaping. [Internet] [Thesis]. Linköping University; 2002. [cited 2021 Apr 16]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1529.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Johansson H. Gain Scheduled Missile Control Using Robust Loop Shaping. [Thesis]. Linköping University; 2002. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1529

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. ZHANG JINGLIANG. Advance Servo Control for Hard Disk Drive in Mobile Application.

Degree: 2011, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/33306

Subjects/Keywords: servo control; hard disk drive; loop shaping; optimal control; track following; track seeking

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APA (6^th Edition):

JINGLIANG, Z. (2011). Advance Servo Control for Hard Disk Drive in Mobile Application. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/33306

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

JINGLIANG, ZHANG. “Advance Servo Control for Hard Disk Drive in Mobile Application.” 2011. Thesis, National University of Singapore. Accessed April 16, 2021. http://scholarbank.nus.edu.sg/handle/10635/33306.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

JINGLIANG, ZHANG. “Advance Servo Control for Hard Disk Drive in Mobile Application.” 2011. Web. 16 Apr 2021.

Vancouver:

JINGLIANG Z. Advance Servo Control for Hard Disk Drive in Mobile Application. [Internet] [Thesis]. National University of Singapore; 2011. [cited 2021 Apr 16]. Available from: http://scholarbank.nus.edu.sg/handle/10635/33306.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

JINGLIANG Z. Advance Servo Control for Hard Disk Drive in Mobile Application. [Thesis]. National University of Singapore; 2011. Available from: http://scholarbank.nus.edu.sg/handle/10635/33306

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Rance, Guillaume. Commande H∞ paramétrique et application aux viseurs gyrostabilisés : Parametric H∞ control and its application to gyrostabilized sights.

Degree: Docteur es, Automatique, 2018, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2018SACLS152

►

Cette thèse porte sur la commande H∞ par loop-shaping pour les systèmes linéaires à temps invariant d'ordre faible avec ou sans retard et dépendant de… (more)

▼

Cette thèse porte sur la commande H∞ par loop-shaping pour les systèmes linéaires à temps invariant d'ordre faible avec ou sans retard et dépendant de paramètres inconnus. L'objectif est d'obtenir des correcteurs H∞ paramétriques, c'est-à-dire dépendant explicitement des paramètres inconnus, pour application à des viseurs gyrostabilisés.L'existence de ces paramètres inconnus ne permet plus l'utilisation des techniques numériques classiques pour la résolution du problème H∞ par loop-shaping. Nous avons alors développé une nouvelle méthodologie permettant de traiter les systèmes linéaires de dimension finie grâce à l'utilissation de techniques modernes de calcul formel dédiées à la résolution des systèmes polynomiaux (bases de Gröbner, variétés discriminantes, etc.).Une telle approche présente de multiples avantages: étude de sensibilités du critère H∞ par rapport aux paramètres, identification de valeurs de paramètres singulières ou remarquables, conception de correcteurs explicites optimaux/robustes, certification numérique des calculs, etc. De plus, nous montrons que cette approche peut s'étendre à une classe de systèmes à retard.Plus généralement, cette thèse s'appuie sur une étude symbolique des équations de Riccati algébriques. Les méthodologies génériques développées ici peuvent s'étendre à de nombreux problèmes de l'automatique, notamment la commande LQG, le filtrage de Kalman ou invariant.

This PhD thesis deals with the H∞ loop-shaping design for low order linear time invariant systems depending on unknown parameters. The objective of the PhD thesis is to obtain parametric H∞ controllers, i.e. controllers which depend explicitly on the unknown model parameters, and to apply them to the stabilization of gyrostabilized sights.Due to the unknown parameters, no numerical algorithm can solve the robust control problem. Using modern symbolic techniques dedicated to the solving of polynomial systems (Gröbner bases, discriminant varieties, etc.), we develop a new methodology to solve this problem for finite-dimensional linear systems.This approach shows several advantages : we can study the sensibilities of the H∞ criterion to the parameter variations, identify singular or remarquable values of the parameters, compute controllers which depend explicitly on the parameters, certify the numerical computations, etc. Furthermore, we show that this approach can be extended to a class of linear time-delay systems.More generally, this PhD thesis develops an algebraic approach for the study of algebraic Riccati equations. Thus, the methodology obtained can be extended to many different problems such as LQG control and Kalman or invariant filtering.

Advisors/Committee Members: Quadrat, Alban (thesis director).

Subjects/Keywords: Commande H∞ par loop-shaping; Paramètres de modèles et paramètres inconnus; Équations de Riccati algébriques; Méthodes de calcul formel (systèmes polynomiaux, symbolique-numérique); Systèmes à retard; Viseurs; Commande adaptative; Géométrie algébrique réelle; H∞ loop-shaping control; Model parameters and unknown parameters; Algebraic Riccati equations; Symbolic computation methods (polynomial systems, symbolic-numeric); Time-delay systems; Sights; Adaptative control; Real algebraic geometry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rance, G. (2018). Commande H∞ paramétrique et application aux viseurs gyrostabilisés : Parametric H∞ control and its application to gyrostabilized sights. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLS152

Chicago Manual of Style (16^th Edition):

Rance, Guillaume. “Commande H∞ paramétrique et application aux viseurs gyrostabilisés : Parametric H∞ control and its application to gyrostabilized sights.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed April 16, 2021. http://www.theses.fr/2018SACLS152.

MLA Handbook (7^th Edition):

Rance, Guillaume. “Commande H∞ paramétrique et application aux viseurs gyrostabilisés : Parametric H∞ control and its application to gyrostabilized sights.” 2018. Web. 16 Apr 2021.

Vancouver:

Rance G. Commande H∞ paramétrique et application aux viseurs gyrostabilisés : Parametric H∞ control and its application to gyrostabilized sights. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2018SACLS152.

Council of Science Editors:

Rance G. Commande H∞ paramétrique et application aux viseurs gyrostabilisés : Parametric H∞ control and its application to gyrostabilized sights. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLS152

Texas A&M University

16. Liu, Qiyuan. Low Power Analog to Digital Converters in Advanced CMOS Technology Nodes.

Degree: PhD, Electrical Engineering, 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/161333

► The dissertation presents system and circuit solutions to improve the power efficiency and address high-speed design issues of ADCs in advanced CMOS technologies. For image… (more)

▼ The dissertation presents system and circuit solutions to improve the power efficiency and address high-speed design issues of ADCs in advanced CMOS technologies. For image sensor applications, a high-performance digitizer prototype based on column-parallel single-slope ADC (SS-ADC) topology for readout of a back-illuminated 3D-stacked CMOS image sensor is presented. To address the high power consumption issue in high-speed digital counters, a passing window (PW) based hybrid counter topology is proposed. To address the high column FPN under bright illumination conditions, a double auto-zeroing (AZ) scheme is proposed. The proposed techniques are experimentally verified in a prototype chip designed and fabricated in the TSMC 40 nm low-power CMOS process. The PW technique saves 52.8% of power consumption in the hybrid digital counters. Dark/bright column fixed pattern noise (FPN) of 0.0024%/0.028% is achieved employing the proposed double AZ technique for digital correlated double sampling (CDS). A single-column digitizer consumes total power of 66.8μW and occupies an area of 5.4 µm x 610 µm. For mobile/wireless receiver applications, this dissertation presents a low-power wide-bandwidth multistage noise-shaping (MASH) continuous-time delta-sigma modulator (CT-ΔΣM) employing finite impulse response (FIR) digital-to-analog converters (DACs) and encoder-embedded loop-unrolling (EELU) quantizers. The proposed MASH 1-1-1 topology is a cascade of three single-loop first-order CT-ΔΣM stages, each of which consists of an active-RC integrator, a current-steering DAC, and an EELU quantizer. An FIR filter in the main 1.5-bit DAC improves the modulator’s jitter sensitivity performance. FIR’s effect on the noise transfer function (NTF) of the modulator is compensated in the digital domain thanks to the MASH topology. Instead of employing a conventional analog direct feedback path, a 1.5-bit EELU quantizer based on multiplexing comparator outputs is proposed; this approach is suitable for highspeed operation together with power and area benefits. Fabricated in a 40-nm low-power CMOS technology, the modulator’s prototype achieves a 67.3 dB of signal-to-noise and distortion ratio (SNDR), 68 dB of signal-to-noise ratio (SNR), and 68.2 dB of dynamic range (DR) within 50.5 MHz of bandwidth (BW), while consuming 19 mW of total power (P). The proposed modulator features 161.5 dB of figure-of-merit (FOM), defined as FOM = SNDR + 10 log10 (BW/P). Advisors/Committee Members: Silva-Martinez, Jose (advisor), Hoyos, Sebastian (committee member), Hu, Jiang (committee member), Porter, Jay (committee member).

Subjects/Keywords: CMOS image sensor digitizer; single-slope ADC; low-power counter; correlated double sampling; fixed pattern noise; analog-to-digital converter (ADC); delta-sigma modulator (ΔΣM); multistage noise-shaping (MASH); finite impulse response (FIR); loop-unrolling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, Q. (2017). Low Power Analog to Digital Converters in Advanced CMOS Technology Nodes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161333

Chicago Manual of Style (16^th Edition):

Liu, Qiyuan. “Low Power Analog to Digital Converters in Advanced CMOS Technology Nodes.” 2017. Doctoral Dissertation, Texas A&M University. Accessed April 16, 2021. http://hdl.handle.net/1969.1/161333.

MLA Handbook (7^th Edition):

Liu, Qiyuan. “Low Power Analog to Digital Converters in Advanced CMOS Technology Nodes.” 2017. Web. 16 Apr 2021.

Vancouver:

Liu Q. Low Power Analog to Digital Converters in Advanced CMOS Technology Nodes. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/1969.1/161333.

Council of Science Editors:

Liu Q. Low Power Analog to Digital Converters in Advanced CMOS Technology Nodes. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161333

17. Osinuga, Mobolaji. Weight Optimization in H∞ Loop-Shaping Control and Applications.

Degree: 2012, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:180608

► The primary objective of this thesis is to leverage on the framework of H∞ loop-shaping control to formulate efficient and powerful optimization algorithms in LMI… (more)

▼ The primary objective of this thesis is to leverage on the framework of H∞ loop-shaping control to formulate efficient and powerful optimization algorithms in LMI framework for the synthesis of performance loop-shaping weights. The H∞ loop-shaping design procedure is an efficient controller synthesis technique that combines classical loop-shaping concepts with H∞ synthesis. This procedure establishes a good tradeoff between robust stability and robust performance of a closed-loop system in a systematic manner. However, the selection of pre- and/or post-compensators, a crucial step in the design procedure, is nontrivial as factors such as the right half plane poles/zeros of the nominal plant, roll-off rate around the crossover frequency, strength of cross-coupling in multi-input multi-output systems, expected bandwidth, etc. must be adequately considered.Firstly, a frequency-dependent weight optimization framework is formulated in state-space form in order to remove the dependency on frequency while retaining the objective of maximizing the robust stability margin of a closed-loop system. This formulation facilitates the synthesis of low-order controllers, which is desirable from an implementation perspective.A weight optimization framework that incorporates smoothness constraints in order to prevent the cancellation of important modes of the system, for example, lightly damped poles/zeros of flexible structures, is subsequently formulated. The proposed formulation is intuitive from a design perspective as the smoothness constraints are expressed as gradient constraints on a log-log scale in dB/decade, consistent with the notation used in Bode plot for single-input single-output systems and singular value plots for multi-input multi-output systems.Thereafter, an optimization framework that maximizes the robust performance of a closed-loop system is presented. The philosophy in this framework is in line with practical design objectives that give the best achievable robust performance on a particular problem once a level of robust stability margin is demanded.Lastly, a novel unmanned vehicle is proposed. The vehicle uses a full six-degree-of-freedom tri-rotor actuation, capable of fully decoupled thrust and torque vectoring in all the 3D space. This vehicle can act as an unmanned ground vehicle or unmanned aerial vehicle, but the objective herein is restricted to the upright stability of the vehicle while operating on the ground as this is a precursor to rolling motion. The full nonlinear model of the vehicle is derived and linearized for subsequent controller synthesis, and this is thereafter validated by means of numerical simulations. Advisors/Committee Members: Lanzon, Alexander.

Subjects/Keywords: H∞ Loop-Shaping Control; Weight Synthesis; Robust Control; LMI; Unmanned Vehicle

…solution to weight optimization problem in H∞ loop-shaping control.” Automatica, vol. 48, no. 3… …algorithm for maximizing robust performance in H∞ loop-shaping design.” International Journal of… …optimization for H∞ loop-shaping design.” Proceedings of the 18th Mediterranean Conference on Control… …and A. Lanzon: “Weight optimization for maximizing robust performance in H∞ loop-shaping… …Linear Quadratic-Regulator Linear Quadratic-Guassian Loop-Shaping Design Procedure Unmanned…

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APA (6^th Edition):

Osinuga, M. (2012). Weight Optimization in H∞ Loop-Shaping Control and Applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:180608

Chicago Manual of Style (16^th Edition):

Osinuga, Mobolaji. “Weight Optimization in H∞ Loop-Shaping Control and Applications.” 2012. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:180608.

MLA Handbook (7^th Edition):

Osinuga, Mobolaji. “Weight Optimization in H∞ Loop-Shaping Control and Applications.” 2012. Web. 16 Apr 2021.

Vancouver:

Osinuga M. Weight Optimization in H∞ Loop-Shaping Control and Applications. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2021 Apr 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:180608.

Council of Science Editors:

Osinuga M. Weight Optimization in H∞ Loop-Shaping Control and Applications. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:180608

18. Airimitoaie, Tudor-Bogdan. Commande robuste et calibrage des systèmes de contrôle actif de vibrations : Robust Design and Tuning of Active Vibration Control Systems.

Degree: Docteur es, Sciences et technologie industrielles, 2012, Grenoble; UNIVERSITE POLYTECHNIQUE DE BUCAREST

URL: http://www.theses.fr/2012GRENT015

►

Dans cette thèse, nous présentons des solutions pour la conception des systèmes de contrôle actif de vibrations. Dans la première partie, des méthodes de contrôle… (more)

▼

Dans cette thèse, nous présentons des solutions pour la conception des systèmes de contrôle actif de vibrations. Dans la première partie, des méthodes de contrôle par action anticipatrice (feedforward) sont développées. Celles-ci sont dédiées à la suppression des perturbations bande large en utilisant une image de la perturbation mesurée par un deuxième capteur, en amont de la variable de performance à minimiser. Les algorithmes présentés dans cette mémoire sont conçus pour réaliser de bonnes performances et maintenir la stabilité du système en présence du couplage positif interne qui apparaît entre le signal de commande et l'image de la perturbation. Les principales contributions de cette partie sont l'assouplissement de la condition de « Stricte Positivité Réelle » (SPR) par l'utilisation des algorithmes d'adaptation « Intégrale + Proportionnelle » et le développement de compensateurs à action anticipatrice (feedforward) sur la base de la paramétrisation Youla-Kučera. La deuxième partie de la thèse concerne le rejet des perturbations bande étroite par contre-réaction adaptative (feedback). Une méthode d'adaptation indirecte est proposée pour le rejet de plusieurs perturbations bande étroite en utilisant des filtres Stop-bande et la paramétrisation Youla-Kučera. Cette méthode utilise des Filtres Adaptatifs à Encoche en cascade pour estimer les fréquences de perturbations sinusoïdales puis des Filtres Stop-bande pour introduire des atténuations aux fréquences estimées. Les algorithmes sont vérifiés et validés sur un dispositif expérimental disponible au sein du département Automatique du laboratoire GIPSA-Lab de Grenoble.

In this thesis, solutions for the design of robust Active Vibration Control (AVC) systems are presented. The thesis report is composed of two parts. In the first one, feedforward adaptive methods are developed. They are dedicated to the suppression of large band disturbances and use a measurement, correlated with the disturbance, obtained upstream from the performance variable by the use of a second transducer. The algorithms presented in this thesis are designed to achieve good performances and to maintain system stability in the presence of the internal feedback coupling which appears between the control signal and the image of the disturbance. The main contributions in this part are the relaxation of the Strictly Positive Real (SPR) condition appearing in the stability analysis of the algorithms by use of “Integral + Proportional” adaptation algorithms and the development of feedforward compensators for noise or vibration reduction based on the Youla-Kučera parameterization. The second part of this thesis is concerned with the negative feedback rejection of narrow band disturbances. An indirect adaptation method for the rejection of multiple narrow band disturbances using Band-Stop Filters (BSF) and the Youla-Kučera parameterization is presented. This method uses cascaded Adaptive Notch Filters (ANF) to estimate the frequencies of the disturbances' sinusoids and then, Band-stop Filters are…

Advisors/Committee Members: Dugard, Luc (thesis director), Landau, Ioan Doré (thesis director).

Subjects/Keywords: Contrôle actif de vibrations; Commande adaptative; Paramétrisation de Youla-Kučera; Contrôle par action anticipatrice; Calibrage de fonctions de sensibilité; Active vibration control; Adaptive control; Parametric identification; Youla-Kučera parametrisation; Feedforward control; Loop-shaping

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APA (6^th Edition):

Airimitoaie, T. (2012). Commande robuste et calibrage des systèmes de contrôle actif de vibrations : Robust Design and Tuning of Active Vibration Control Systems. (Doctoral Dissertation). Grenoble; UNIVERSITE POLYTECHNIQUE DE BUCAREST. Retrieved from http://www.theses.fr/2012GRENT015

Chicago Manual of Style (16^th Edition):

Airimitoaie, Tudor-Bogdan. “Commande robuste et calibrage des systèmes de contrôle actif de vibrations : Robust Design and Tuning of Active Vibration Control Systems.” 2012. Doctoral Dissertation, Grenoble; UNIVERSITE POLYTECHNIQUE DE BUCAREST. Accessed April 16, 2021. http://www.theses.fr/2012GRENT015.

MLA Handbook (7^th Edition):

Airimitoaie, Tudor-Bogdan. “Commande robuste et calibrage des systèmes de contrôle actif de vibrations : Robust Design and Tuning of Active Vibration Control Systems.” 2012. Web. 16 Apr 2021.

Vancouver:

Airimitoaie T. Commande robuste et calibrage des systèmes de contrôle actif de vibrations : Robust Design and Tuning of Active Vibration Control Systems. [Internet] [Doctoral dissertation]. Grenoble; UNIVERSITE POLYTECHNIQUE DE BUCAREST; 2012. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2012GRENT015.

Council of Science Editors:

Airimitoaie T. Commande robuste et calibrage des systèmes de contrôle actif de vibrations : Robust Design and Tuning of Active Vibration Control Systems. [Doctoral Dissertation]. Grenoble; UNIVERSITE POLYTECHNIQUE DE BUCAREST; 2012. Available from: http://www.theses.fr/2012GRENT015

Georgia Tech

19. Potter, James Jackson. Input-shaped manual control of helicopters with suspended loads.

Degree: PhD, Mechanical Engineering, 2013, Georgia Tech

URL: http://hdl.handle.net/1853/50342

► A helicopter can be used to transport a load hanging from a suspension cable. This technique is frequently used in construction, firefighting, and disaster relief… (more)

▼ A helicopter can be used to transport a load hanging from a suspension cable. This technique is frequently used in construction, firefighting, and disaster relief operations, among other applications. Unfortunately, the suspended load swings, which makes load positioning difficult and can degrade control of the helicopter. This dissertation investigates the use of input shaping (a command-filtering technique for reducing vibration) to mitigate the load swing problem. The investigation is conducted using two different, but complementary, approaches. One approach studies manual tracking tasks, where a human attempts to make a cursor follow an unpredictably moving target. The second approach studies horizontal repositioning maneuvers on small-scale helicopter systems, including a novel testbed that limits the helicopter and suspended load to move in a vertical plane. Both approaches are used to study how input shaping affects control of a flexible element (the suspended load) and a driven base (the helicopter). In manual tracking experiments, conventional input shapers somewhat degraded control of the driven base but greatly improved control of the flexible element. New input shapers were designed to improve load control without negatively affecting base control. A method for adjusting the vibration-limiting aggressiveness of any input shaper between unshaped and fully shaped was also developed. Next, horizontal repositioning maneuvers were performed on the helicopter testbed using a human-pilot-like feedback controller from the literature, with parameter values scaled to match the fast dynamics of the model helicopter. It was found that some input shapers reduced settling time and peak load swing when applied to Attitude Command or Translational Rate Command response types. When the load was used as a position reference instead of the helicopter, the system was unstable without input shaping, and adding input shaping to a Translational Rate Command was able to stabilize the load-positioning system. These results show the potential to improve the safety and efficiency of helicopter suspended load operations. Advisors/Committee Members: Singhose, William (advisor), Costello, Mark (committee member), Johnson, Eric (committee member), Pritchett, Amy (committee member), Whiteman, Wayne (committee member).

Subjects/Keywords: Helicopter; Input shaping; Command filter; Sling load; Flexible system; Manual control; Human-in-the-loop control; Operator study; Handling qualities; Experimental platform; Dynamic modeling; Helicopters; Flight control; Cranes, derricks, etc. Dynamics; Feedback control systems; Damping (Mechanics)

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APA (6^th Edition):

Potter, J. J. (2013). Input-shaped manual control of helicopters with suspended loads. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/50342

Chicago Manual of Style (16^th Edition):

Potter, James Jackson. “Input-shaped manual control of helicopters with suspended loads.” 2013. Doctoral Dissertation, Georgia Tech. Accessed April 16, 2021. http://hdl.handle.net/1853/50342.

MLA Handbook (7^th Edition):

Potter, James Jackson. “Input-shaped manual control of helicopters with suspended loads.” 2013. Web. 16 Apr 2021.

Vancouver:

Potter JJ. Input-shaped manual control of helicopters with suspended loads. [Internet] [Doctoral dissertation]. Georgia Tech; 2013. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/1853/50342.

Council of Science Editors:

Potter JJ. Input-shaped manual control of helicopters with suspended loads. [Doctoral Dissertation]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/50342

Arizona State University

20. Shafique, Md Ashfaque Bin. Discrete-time PID Controller Tuning Using Frequency Loop-Shaping.

Degree: MS, Electrical Engineering, 2011, Arizona State University

URL: http://repository.asu.edu/items/14325

► Proportional-Integral-Derivative (PID) controllers are a versatile category of controllers that are commonly used in the industry as control systems due to the ease of their… (more)

▼ Proportional-Integral-Derivative (PID) controllers are a versatile category of controllers that are commonly used in the industry as control systems due to the ease of their implementation and low cost. One problem that continues to intrigue control designers is the matter of finding a good combination of the three parameters - P, I and D of these controllers so that system stability and optimum performance is achieved. Also, a certain amount of robustness to the process is expected from the PID controllers. In the past, many different methods for tuning PID parameters have been developed. Some notable techniques are the Ziegler-Nichols, Cohen-Coon, Astrom methods etc. For all these techniques, a simple limitation remained with the fact that for a particular system, there can be only one set of tuned parameters; i.e. there are no degrees of freedom involved to readjust the parameters for a given system to achieve, for instance, higher bandwidth. Another limitation in most cases is where a controller is designed in continuous time then converted into discrete-time for computer implementation. The drawback of this method is that some robustness due to phase and gain margin is lost in the process. In this work a method of tuning PID controllers using a loop-shaping approach has been developed where the bandwidth of the system can be chosen within an acceptable range. The loop-shaping is done against a Glover-McFarlane type ℋ∞ controller which is widely accepted as a robust control design method. The numerical computations are carried out entirely in discrete-time so there is no loss of robustness due to conversion and approximations near Nyquist frequencies. Some extra degrees of freedom owing to choice of bandwidth and capability of choosing loop-shapes are also involved and are discussed in detail. Finally, comparisons of this method against existing techniques for tuning PID controllers both in continuous and in discrete-time are shown. The results tell us that our design performs well for loop-shapes that are achievable through a PID controller.

Subjects/Keywords: Electrical engineering; Ellipsoid Method; Glover Macfarlane ℋ; ∞; controller; LMI optimization; Loop-Shaping; PID Control; PID tuning

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shafique, M. A. B. (2011). Discrete-time PID Controller Tuning Using Frequency Loop-Shaping. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/14325

Chicago Manual of Style (16^th Edition):

Shafique, Md Ashfaque Bin. “Discrete-time PID Controller Tuning Using Frequency Loop-Shaping.” 2011. Masters Thesis, Arizona State University. Accessed April 16, 2021. http://repository.asu.edu/items/14325.

MLA Handbook (7^th Edition):

Shafique, Md Ashfaque Bin. “Discrete-time PID Controller Tuning Using Frequency Loop-Shaping.” 2011. Web. 16 Apr 2021.

Vancouver:

Shafique MAB. Discrete-time PID Controller Tuning Using Frequency Loop-Shaping. [Internet] [Masters thesis]. Arizona State University; 2011. [cited 2021 Apr 16]. Available from: http://repository.asu.edu/items/14325.

Council of Science Editors:

Shafique MAB. Discrete-time PID Controller Tuning Using Frequency Loop-Shaping. [Masters Thesis]. Arizona State University; 2011. Available from: http://repository.asu.edu/items/14325

21. 柳野, 秀樹. H∞ループ整形法を用いた横軸形磁気軸受のロバスト非干渉制御に関する研究.

Degree: Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学

URL: http://hdl.handle.net/10119/1290

Supervisor:藤田政之

情報科学研究科

修士

Subjects/Keywords: 非干渉制御，アダマール重み，ループ整形，横軸形磁気軸受; decoupling control, hadamard weight, loop shaping

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APA (6^th Edition):

柳野, �. (n.d.). H∞ループ整形法を用いた横軸形磁気軸受のロバスト非干渉制御に関する研究. (Thesis). Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10119/1290

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

柳野, 秀樹. “H∞ループ整形法を用いた横軸形磁気軸受のロバスト非干渉制御に関する研究.” Thesis, Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Accessed April 16, 2021. http://hdl.handle.net/10119/1290.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

柳野, 秀樹. “H∞ループ整形法を用いた横軸形磁気軸受のロバスト非干渉制御に関する研究.” Web. 16 Apr 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

柳野 �. H∞ループ整形法を用いた横軸形磁気軸受のロバスト非干渉制御に関する研究. [Internet] [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10119/1290.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

柳野 �. H∞ループ整形法を用いた横軸形磁気軸受のロバスト非干渉制御に関する研究. [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; Available from: http://hdl.handle.net/10119/1290

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

22. Taylor, Jonathan. Robust Bode Methods for Feedback Controller Design of Uncertain Systems.

Degree: 2014, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/447

► In this work, we introduce several novel approaches to feedback controller design, known collectively as the “Robust Bode” methods, which adapt classical control principles to… (more)

Subjects/Keywords: robust control; bode plots; loop-shaping; nonlinear dynamic systems; unstable and non-minimum phase; uncertain feedback systems

…Pendulum: CRCBode Loop-Shaping . . . . . . . . . . . . . . . . . . 104 4.10.4 Inverted Pendulum… …QBode Loop-Shaping . . . . . . . . . . . . . . . . . . . . 106 4.11 Conclusion… …122 MIMO CRCBode Loop-Shaping Design Iterations . . . . . . . . . . . . . . . 125… …Loop-Shaping Iteration 0: LQG based controller, K0 . . . . . . . . . . . . 105 4.33 CRCBode… …Loop-Shaping Iteration 1: K1 . . . . . . . . . . . . . . . . . . . . . . . . . 106 4.34…

13 more images…

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APA (6^th Edition):

Taylor, J. (2014). Robust Bode Methods for Feedback Controller Design of Uncertain Systems. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/447

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Taylor, Jonathan. “Robust Bode Methods for Feedback Controller Design of Uncertain Systems.” 2014. Thesis, Carnegie Mellon University. Accessed April 16, 2021. http://repository.cmu.edu/dissertations/447.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Taylor, Jonathan. “Robust Bode Methods for Feedback Controller Design of Uncertain Systems.” 2014. Web. 16 Apr 2021.

Vancouver:

Taylor J. Robust Bode Methods for Feedback Controller Design of Uncertain Systems. [Internet] [Thesis]. Carnegie Mellon University; 2014. [cited 2021 Apr 16]. Available from: http://repository.cmu.edu/dissertations/447.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Taylor J. Robust Bode Methods for Feedback Controller Design of Uncertain Systems. [Thesis]. Carnegie Mellon University; 2014. Available from: http://repository.cmu.edu/dissertations/447

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. Okyay, Ahmet. Mechatronic Design, Dynamics, Controls, and Metrology of a Long-Stroke Linear Nano-Positioner.

Degree: 2016, University of Waterloo

URL: http://hdl.handle.net/10012/11091

► Precision motion systems find a broad range of application in various fields such as micro/nano machining tools, lithography scanners, testing and metrology machines, micro-assembly, biotechnology,… (more)

▼ Precision motion systems find a broad range of application in various fields such as micro/nano machining tools, lithography scanners, testing and metrology machines, micro-assembly, biotechnology, optics manufacturing, magnetic data-storage, and optical disk drives. In this thesis, an ultraprecision motion stage (nano-positioner) is designed and built based on the concept of a low-cost desktop precision micro machine tool. Linear positioning performance requirements of such a machine tool are used as design objectives. The nano-positioner’s mechatronic design is carried out in such a way to integrate different components towards high performance in terms of high dynamic range, high feedrate, servo accuracy, and geometric accuracy. A self-aligning air-bearing/bushing arrangement is employed for frictionless motion with infinite theoretical resolution, as well as reduced assembly costs and footprint. The air discharge from the air bearings/bushings are also utilized for assistance in the removal of heat dissipated from actuator coils. A voice coil actuator (VCA) is chosen for continuous, non-contact operation, and designed from scratch. A number of dimensional variables of the cylindrical VCA are set according to required forces, motion range, production/assembly tolerances, magnet availability, leakage flux, etc. The remainder of variables is determined according to two novel optimization objectives defined independent of the coil wire gauge, which separately aim for maximum stage acceleration capacity and minimum heat generation per generated force. The actuators are operated in a complementary double configuration for control simplicity which allows for a straightforward and robust design for controller stability. Controller design is carried out at current control and position control levels. Current frequency response of the voice coil actuators is obtained, and they are observed to possess additional high frequency dynamics on top of the expected first order lumped resistance and inductance model. These are attributed to the eddy currents in the stator structure. A closed loop bandwidth of better than 907 [Hz] is achieved using the integrator plus lead current controller. The position controller is designed using the identified overall plant which includes the moving body, current dynamics and the force response. The lead-lag position controller is tuned at 450 [Hz] cross-over frequency and 40 [deg] phase margin. The control error during the tracking of a step trajectory filtered at 40 [Hz] is found to vary between ±5 [nm], indicating a 4 million dynamic range over the 20 [mm] stroke length. Dynamic Error Budgeting (DEB) method has been used to resolve the components of the error, and the largest contributor is found to be the sensor noise. The actual positioning error, which is an ideal signal excluding sensor noise is estimated using the same methodology and disturbance models, and it is found to be 0.680 [nm] root-mean-square (RMS). For the trajectory following case, experiments are carried out with and…

Subjects/Keywords: Nano-positioning; Mechatronic design; Voice coil actuator; Laser interferometric metrology; Modal testing; Error budget; Dynamic Error Budgeting; Loop shaping controller design; Air bearing; Encoder quadrature detection errors; Peak-picking method; Optimization; Micro-milling; Large dynamic range

…64 Fig. 5.1 Overview of the position control loop… …and loop TF ( Lc )… …of micro-scale sensors for measurement in six axes, the device is operated in open loop in…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Okyay, A. (2016). Mechatronic Design, Dynamics, Controls, and Metrology of a Long-Stroke Linear Nano-Positioner. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/11091

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Okyay, Ahmet. “Mechatronic Design, Dynamics, Controls, and Metrology of a Long-Stroke Linear Nano-Positioner.” 2016. Thesis, University of Waterloo. Accessed April 16, 2021. http://hdl.handle.net/10012/11091.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Okyay, Ahmet. “Mechatronic Design, Dynamics, Controls, and Metrology of a Long-Stroke Linear Nano-Positioner.” 2016. Web. 16 Apr 2021.

Vancouver:

Okyay A. Mechatronic Design, Dynamics, Controls, and Metrology of a Long-Stroke Linear Nano-Positioner. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10012/11091.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Okyay A. Mechatronic Design, Dynamics, Controls, and Metrology of a Long-Stroke Linear Nano-Positioner. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/11091

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Παναγιωτόπουλος, Ηλίας. Αλγόριθμοι και τεχνικές συγχρονισμού ασύρματων ψηφιακών δεκτών ορθογώνιας γραμμικής διαμόρφωσης.

Degree: 2000, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/16554

► This thesis addresses critical algorithmic and architectural design issues concerning digital receivers for high-capacity radio communication systems. The results presented herein, in effect, provide a… (more)

▼ This thesis addresses critical algorithmic and architectural design issues concerning digital receivers for high-capacity radio communication systems. The results presented herein, in effect, provide a comprehensive approach in optimal pulse shaping networks, channel estimation and synchronization techniques from the basic theoretical concept up to implementation choices. The thesis is composed of three main parts. First, a composite optimization methodology based on the steepest-descent and the quasi-Newton minimax algorithms is developed for the prompt design of physically realizable biquadratic pulse shaping filters for data transmission. Current work has proved that cascaded pulse shaping realizations can meet stringent in-band requirements in an optimal manner while inexpensively guarantee performance robustness under implementation. Next, a unified algebraic treatment that tackles directly in a systematic and mathematically effective manner the synchronization errors estimation problem variations is composed. The proposed synthesis methodology contributes further to the optimality of the symbol-rated polarity estimation algorithms, since it proves that the ensuing error signal is based on optimal algebraic expressions constituted by a minimum set of prime-implicants and therefore is characterized by maximum noise immunity. The third and largest part of the thesis introduces the novel concept of soft loop diversity via adaptive statistical loop filtering; this innovative technique is applied to the class of binary quantized digital phase locked loop (DPLL) synchronizers to obtain both fast acquisition and reliable steady state tracking simultaneously. The proposed loop is analyzed by exercising Markovian analytical techniques on a simplified two-dimensional (2-D) Markov chain approximation. All things considered, it is claimed that the synchronization diversity enigma is optimally resolved by exercising a hybridized adaptation/verification algorithm on the statistical confidence requirements of the discrete phase corrections in closed loop synchronization schemes.

Subjects/Keywords: Συγχρονισμός; Βρόχος κλειδώματος φάσης; Μαρκοβιανές αλυσίδες; Στοχαστικές ανελίξεις; Εργοδικές πιθανότητες; Μόνιμη απόκριση; Μεταβατική απόκριση; Επαγωγική διαφόριση; Ψηφιακή επεξεργασία σημάτων; Αυτόματος έλεγχος; Δυναμικός προγραμματισμός; Προσαρμοσμένο φίλτρο; Πολυωνυμική προσέγγιση; Αρχή μεγίστης πιθανοφάνειας; Εκτιμητική θεωρία; Ορθογώνια γραμμική διαμόρφωση; Τηλεπικοινωνίες; Synchronization; Phase locked loop (PLL); Markov chains; Stochastic processes; Ergodic probabilities; Acquisition responce; Tracking response; Diversity techniques; Digital signal processing; Adaptive control; Dynamic programming; Matched filter; Pulse shaping methods; Optimization; Maximum likelihood estimation; Modem; Quadrature amplitude modulation (QAM)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Παναγιωτόπουλος, . �. (2000). Αλγόριθμοι και τεχνικές συγχρονισμού ασύρματων ψηφιακών δεκτών ορθογώνιας γραμμικής διαμόρφωσης. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/16554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Παναγιωτόπουλος, Ηλίας. “Αλγόριθμοι και τεχνικές συγχρονισμού ασύρματων ψηφιακών δεκτών ορθογώνιας γραμμικής διαμόρφωσης.” 2000. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 16, 2021. http://hdl.handle.net/10442/hedi/16554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Παναγιωτόπουλος, Ηλίας. “Αλγόριθμοι και τεχνικές συγχρονισμού ασύρματων ψηφιακών δεκτών ορθογώνιας γραμμικής διαμόρφωσης.” 2000. Web. 16 Apr 2021.

Vancouver:

Παναγιωτόπουλος �. Αλγόριθμοι και τεχνικές συγχρονισμού ασύρματων ψηφιακών δεκτών ορθογώνιας γραμμικής διαμόρφωσης. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2000. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10442/hedi/16554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Παναγιωτόπουλος �. Αλγόριθμοι και τεχνικές συγχρονισμού ασύρματων ψηφιακών δεκτών ορθογώνιας γραμμικής διαμόρφωσης. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2000. Available from: http://hdl.handle.net/10442/hedi/16554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations