scholarly journals On practical application of Zubov’s optimal damping concept

2020 ◽  
Vol 16 (3) ◽  
pp. 293-315
Author(s):  
Evgeny I. Veremey ◽  
Keyword(s):  
Practical Implementation ◽  
Optimization Approach ◽  
Practical Application ◽  
Closed Loop System ◽  
Control Laws ◽  
Optimal Damping ◽  
New Ideas ◽  
And Performance ◽  
Essential Connection ◽  
Significant Attention

This article presents some new ideas connected to nonlinear and nonautonomous control laws based on the application of an optimization approach. There is an essential connection between practical demands and the functionals to be minimized. This connection is at the heart of the proposed methods. The discussion is focused on the optimal damping concept first proposed by V. I. Zubov in the early 1960’s. Significant attention is paid to various modern aspects of the optimal damping theory’s practical implementation. Emphasis is given to the specific choice of the functional to be damped to provide the desirable stability and performance features of a closed-loop system. The applicability and effectiveness of the proposed approach are confirmed by an illustrative numerical example.

Study of Cycloidal Pendulum Dynamic Absorber for Vibration Control of Structures

2006 ◽  
Author(s):  
Toshihiko Komatsuzaki ◽  
Yoshio Iwata
Keyword(s):  
Vibration Control ◽  
Natural Frequency ◽  
Experimental Investigations ◽  
Practical Application ◽  
Pendulum System ◽  
Optimal Damping ◽  
Intrinsic Nonlinearity ◽  
New Type ◽  
Dynamic Absorber ◽  
And Performance

The dynamic absorber has been widely used for suppressing vibration in structures. In practical application, the optimal tuned absorbers are designed and used in terms of natural frequency and additional damping so that resultant frequency response may become fully reduced. Among various types of dynamic absorber, the pendulum type is preferable due to its simple constitution and performance reliability. However, damping performance of ordinal pendulum system may be influenced by levels of excitation because of intrinsic nonlinearity in system which leads to slight change in natural frequency. The present paper deals with a study of new type pendulum dynamic absorber. It is known that pendulum moving along cycloidal curve strictly keeps uniform period. Both analytical and experimental investigations show that a strict optimal damping condition can be satisfied in cycloidal pendulum damper, in conjunction with better damping performance compared with normal pendulum.

Discrete-time L2 loop-shaping control of a Maglev System using the LPV framework

2020 ◽  
Author(s):  
Luiz Benicio Degli Esposte Rosa ◽  
Renan Lima Pereira
Keyword(s):  
Discrete Time ◽  
Linear Time ◽  
Practical Application ◽  
Closed Loop System ◽  
Linear Parameter Varying ◽  
Linear Time Invariant ◽  
Maglev System ◽  
Loop Shaping ◽  
And Performance ◽  
Time Invariant

This paper presents a practical application of discrete-time L2 loop-shaping control to a Maglev system using the linear parameter-varying (LPV) framework. LMI-based conditions are obtained for the synthesis of an output-feedback LPV controller that guarantees robust stability and performance to the closed-loop system. Guidelines to design such controller are given in a simple and transparent manner. In addition, detailed modeling of the didactic plant manufactured by Quanser is carried out and the process of embedding the nonlinear equations into a discretized quasi-LPV (qLPV) model is described. Simulations and experimental results show that the proposed procedure can be an advantageous alternative to handle nonlinear systems in comparison to its linear time-invariant (LTI) version.

scholarly journals Implementation and Validation of Hybrid Control for a DFIG Wind Turbine Using an FPGA Controller Board

Electronics ◽  
2021 ◽  
Vol 10 (24) ◽  
pp. 3154
Author(s):  
Mohammed Taoussi ◽  
Badre Bossoufi ◽  
Manale Bouderbala ◽  
Saad Motahhir ◽  
Eman H. Alkhammash ◽  
...  
Keyword(s):  
Hybrid Control ◽  
Harmonic Distortion ◽  
High Energy ◽  
Great Sensitivity ◽  
Practical Implementation ◽  
Control Laws ◽  
Control Approach ◽  
And Performance ◽  
Doubly Fed ◽  
Controller Board

In this study, a novel control approach for a doubly-fed induction generator (DFIG) is developed and applied to improve the system’s dynamic response and performance for providing high energy quality while avoiding harmonic accumulations. Because of its ease of implementation, field-oriented control (FOC) is frequently used. This control has great sensitivity to the machine’s parametric variations. For this reason, adaptive Backstepping control (ABC) is capable of preserving almost all of the performance and robustness properties. However, its analytical formulation has a problem. To overcome these disadvantages, the hybrid control (HC) is developed and verified to enable rapid response, complete reference tracking, and appropriate dynamic behavior with a low ripple level. This control is a combination of FOC’s and ABC’s control laws. The prepared control is explored by simulation testing using Matlab/Simulink and practical implementation using an FPGA board with actual turbine settings and a real wind profile of Dakhla City, Morocco. The results of hardware simulation show the efficacy of the HC in terms of speed and robustness, with a total harmonic distortion THD = 0.95, a value of THD that reveals the quality of the energy injected into the grid.

scholarly journals Optimal Damping Concept Implementation for Marine Vessels’ Tracking Control

2021 ◽  
Vol 9 (1) ◽  
pp. 45
Author(s):  
Evgeny I. Veremey
Keyword(s):  
Tracking Control ◽  
Control Synthesis ◽  
Synthesis Methods ◽  
Optimization Approach ◽  
Central Attention ◽  
Closed Loop Systems ◽  
Optimal Damping ◽  
Time Regime ◽  
And Performance ◽  
Marine Vessels

This work presents the results of studies related to the design of stabilizing feedback connections for marine vessels moving along initially given trajectories. As is known, in mathematical formalization, this question leads to a problem of tracking control synthesis for nonlinear and non-autonomous plants. To provide desirable stability and performance features of the closed-loop systems to be synthesized, it is appropriate to use an optimization approach. Unlike the known synthesis methods, which are usually used within the framework of this approach, it is proposed to implement the optimal damping concept first developed by V.I. Zubov in the early 60s of the last century. Modern interpretation of this concept allows constructing numerically effective procedures of control law synthesis taking into account its applicability in a real-time regime. Central attention is focused on the questions connected with practical adaptation of the optimal damping methods for marine control systems. The operability and effectiveness of the proposed approach are illustrated by a practical example of tracking control design.

Safety and Performance of the Omnipod®Hybrid Closed-Loop System in Adolescents with Type 1 Diabetes over Five Days Under Free-Living Conditions

Diabetes ◽  
2018 ◽  
Vol 67 (Supplement 1) ◽  
pp. 1376-P
Author(s):  
GREGORY P. FORLENZA ◽  
BRUCE BUCKINGHAM ◽  
JENNIFER SHERR ◽  
THOMAS A. PEYSER ◽  
JOON BOK LEE ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Closed Loop ◽  
Living Conditions ◽  
Loop System ◽  
Closed Loop System ◽  
Free Living ◽  
And Performance ◽  
Free Living Conditions

Safety and Performance of the Omnipod® Hybrid Closed-Loop System in Adults with Type 1 Diabetes over Five Days Under Free-Living Conditions

Diabetes ◽  
2018 ◽  
Vol 67 (Supplement 1) ◽  
pp. 207-OR
Author(s):  
BRUCE A. BUCKINGHAM ◽  
JENNIFER SHERR ◽  
GREGORY P. FORLENZA ◽  
THOMAS A. PEYSER ◽  
JOON BOK LEE ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Closed Loop ◽  
Living Conditions ◽  
Loop System ◽  
Closed Loop System ◽  
Free Living ◽  
And Performance ◽  
Free Living Conditions

Optimizing preventive maintenance over a finite planning horizon in a semi-Markov framework

2020 ◽  
Author(s):  
Antonio Sánchez Herguedas ◽  
Adolfo Crespo Márquez ◽  
Francisco Rodrigo Muñoz
Keyword(s):  
Preventive Maintenance ◽  
Recurrence Relations ◽  
Direct Calculation ◽  
Planning Horizon ◽  
Practical Implementation ◽  
Practical Application ◽  
Mathematical Solution ◽  
Accumulated Reward ◽  
Finite Planning Horizon

Abstract This paper describes the optimization of preventive maintenance (PM) over a finite planning horizon in a semi-Markov framework. In this framework, the asset may be operating, and providing income for the asset owner, or not operating and undergoing PM, or not operating and undergoing corrective maintenance following failure. PM is triggered when the asset has been operating for τ time units. A number m of transitions specifies the finite horizon. This system is described with a set of recurrence relations, and their z-transform is used to determine the value of τ that maximizes the average accumulated reward over the horizon. We study under what conditions a solution can be found, and for those specific cases the solution τ* is calculated. Despite the complexity of the mathematical solution, the result obtained allows the analyst to provide a quick and easy-to-use tool for practical application in many real-world cases. To demonstrate this, the method has been implemented for a case study, and its accuracy and practical implementation were tested using Monte Carlo simulation and direct calculation.

Adaptive attitude-tracking control of spacecraft considering on-orbit refuelling

2020 ◽  
pp. 014233122097313
Author(s):  
Yiqi Xu
Keyword(s):  
Tracking Control ◽  
Closed Loop ◽  
Closed Loop System ◽  
Tracking Errors ◽  
Attitude Tracking ◽  
Control Scheme ◽  
Inertia Model ◽  
And Performance ◽  
Attitude Tracking Control ◽  
The Stability

This paper studies the attitude-tracking control problem of spacecraft considering on-orbit refuelling. A time-varying inertia model is developed for spacecraft on-orbit refuelling, which actually includes two processes: fuel in the transfer pipe and fuel in the tank. Based upon the inertia model, an adaptive attitude-tracking controller is derived to guarantee the stability of the resulted closed-loop system, as well as asymptotic convergence of the attitude-tracking errors, despite performing refuelling operations. Finally, numerical simulations illustrate the effectiveness and performance of the proposed control scheme.

scholarly journals About the possibility of identification of hydrocarbon deposits with the help of NMR

2016 ◽  
Vol 5 (2) ◽  
pp. 551-559
Author(s):  
Pavlo M. Ivashchenko ◽  
Eduard A. Bakai ◽  
Alexander I. Yurchuk
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Absorption Spectra ◽  
Weak Magnetic Field ◽  
Directional Antennas ◽  
Practical Implementation ◽  
Practical Application ◽  
The Earth ◽  
Hydrocarbon Deposits

Abstract. The main purpose of this article is to review the theoretical prerequisites of nuclear magnetic resonance (NMR) application in tasks of search and exploration of hydrocarbon deposits. The identification peculiarities of hydrocarbon deposits in a weak magnetic field of the Earth were analysed. The necessity of using highly directional antennas for providing greater sounding depths as well as the use of absorption spectra of the sought-for minerals as sounding signals were identified and justified. A variant of practical implementation of such a system was examined and examples of practical application of the innovative NMR technology were provided.

scholarly journals Design and Development of Weatherproof Seals for Prefabricated Construction: A Methodological Approach

Buildings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 117 ◽  
Author(s):  
Kristopher Orlowski ◽  
Kasun Shanaka ◽  
Priyan Mendis
Keyword(s):  
Development Process ◽  
Methodological Approach ◽  
Building Industry ◽  
Practical Application ◽  
Design And Development ◽  
Modular Systems ◽  
Design Life ◽  
Flow Charts ◽  
And Performance ◽  
Careful Design

Satisfactory weatherproofing of buildings is vital to maximise their design life and performance which requires the careful design of external sealing technologies. Systems commonly available have served well in conventional construction however with many prefabricated systems emerging in the building industry new and novel means of weatherproofing between panels and modules need to be developed purpose specific to this application. This paper presents a holistic and fundamental methodological approach to Design and Development of waterproof seals and has been applied specific for prefabricated panelised and modular systems. Two purpose specific weatherproof seals are finally presented. Flow charts of the overview of the suggested methodological approach and the processes within which include DfMA that have been incorporated into understanding and developing seals for this practical application. These strategies have enabled a resourceful and holistic set of processes that can be adapted and used for similar forms of product research in new and developing areas of construction such as prefabrication. The design and development process is thoroughly investigated and has resulted in an exploration of the technical challenges and potential solutions which take into consideration factors from installation limitations to building tolerances.

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