scholarly journals Analysis of the damping characteristics of two power electronics-based devices using ‘individual channel analysis and design’

2018 ◽  
Vol 59 ◽  
pp. 527-545 ◽  
Author(s):  
Carlos E. Ugalde-Loo ◽  
Enrique Acha ◽  
Eduardo Licéaga-Castro
Keyword(s):  
Power Electronics ◽  
Analysis And Design ◽  
Damping Characteristics ◽  
Channel Analysis

Simulation and Characterization of Particle Damping in Transient Vibrations

2004 ◽  
Vol 126 (2) ◽  
pp. 202-211 ◽  
Author(s):  
Kuanmin Mao ◽  
Michael Yu Wang ◽  
Zhiwei Xu ◽  
Tianning Chen
Keyword(s):  
Damping Capacity ◽  
Friction Damper ◽  
Dense Particle ◽  
Relative Significance ◽  
Analysis And Design ◽  
Damping Characteristics ◽  
Highly Nonlinear ◽  
Particle Damping ◽  
The Impact

Particle damping is a technique of providing damping with granular particles embedded within small holes in a vibrating structure. The particles absorb kinetic energy through particle-to-wall and particle-to-particle frictional collisions. While the concept of particle damping seems to be simple and it has been used successfully in many fields for vibration reduction, it is difficult to predict the damping characteristics due to complex collisions in the dense particle flow. In this paper, we utilize the 3D discrete element method (DEM) for computer simulation and characterization of particle damping. With the DEM modeling tool validated with experimental results, it is shown that the particle damping can achieve a very high value of specific damping capacity. Furthermore, simulations provide information of particle motions within the container hole during three different regions and help explain their associated damping characteristics. The particle damping is a combination of the impact and the friction damping. The damping is found to be highly nonlinear as the rate of energy dissipation depends on amplitude. Particularly, the damping effect results in a linear decay in amplitude over a finite period of time. These characteristics are examined with respect to a simple single-mass impact damper and a dry-friction damper. It is concluded that the particle damping is a mix of these two damping mechanisms. It is further shown that the relative significance of these damping mechanisms depends on a particular arrangement of the damper. This study represents an effort towards a deeper understanding of particle damping to provide a comprehensive methodology for its analysis and design.

scholarly journals Synchronous Generators Modeling and Control Using the Framework of Individual Channel Analysis and Design: Part 1

2007 ◽  
Vol 8 (5) ◽  
Author(s):  
Carlos Ernesto Ugalde Loo ◽  
Luigi Vanfretti ◽  
Eduardo Liceaga-Castro ◽  
Enrique Acha
Keyword(s):  
Control System ◽  
System Analysis ◽  
Block Diagram ◽  
Synchronous Generator ◽  
Careful Analysis ◽  
Operating Conditions ◽  
Synchronous Generators ◽  
Modeling And Control ◽  
Analysis And Design ◽  
Channel Analysis

In this paper a comprehensive dynamical assessment of a high order synchronous generator plant is carried out using the Individual Channel Analysis and Design (ICAD) framework –a multivariable control engineering tool that allows robustness and system performance evaluations. The great benefits of ICAD are elucidated and contrasted to those provided by the long-time honored block diagram representations. Several models used for the small signal stability analysis of synchronous generators are evaluated under the framework of ICAD. The study, which builds on pioneering work, reveals the great advantages of carrying out control system analysis and design with higher order generator models. Moreover, careful analysis of the ICAD's Multivariable Structure Function (MSF) helps to explain, formally, why some operating conditions of the control system are more critical than others. Furthermore, correct interpretations of MSFs are amenable to robust and stable control system designs. Two kinds of studies are considered in the paper; one assesses operation under various power factor conditions and the other under a varying tie-line reactance. The control system design and stability and structural robustness assessment of the system are presented in the second part of this paper. Moreover, results obtained under the ICAD framework are compared with those arising from conventional controllers.

Comparison of Measured Ship Squat with Numerical and Empirical Methods

2013 ◽  
Vol 57 (02) ◽  
pp. 73-85
Author(s):  
Michael J. Briggs ◽  
Paul J. Kopp ◽  
Vladimir K. Ankudinov ◽  
Andrew L. Silver
Keyword(s):  
International Association ◽  
Transport Infrastructure ◽  
Panama Canal ◽  
Ship Motions ◽  
Evaluation Tool ◽  
Analysis And Design ◽  
Numerical Predictions ◽  
World Association ◽  
Channel Analysis ◽  
Hydraulics Laboratory

The Beck, Newman and Tuck (BNT) numerical predictions are used in the Coastal and Hydraulics Laboratory (CHL) Channel Analysis and Design Evaluation Tool (CADET) model for predicting underkeel clearance (UKC) resulting from ship motions and squat. The Ankudinov empirical squat prediction formula has been used in the CHL ship simulator and was recently updated. The World Association for Waterborne Transport Infrastructure (formerly The Permanent International Association of Navigation Congresses, PIANC) has recommended several empirical and physics-based formulas for the prediction of ship squat. Some of the most widely used formulas include those of Barrass, Eryuzlu, Huuska, ICORELS, Romisch, Tuck, and Yoshimura. The purpose of this article is to compare BNT, Ankudinov, and PIANC predictions with measured DGPS squat data from the Panama Canal for four ships. These comparisons demonstrate that the BNT, Ankudinov, and PIANC predictions fall within the range of squat measurements and can be used with confidence in deep draft channel design.

Fundamental Analysis of the Static VAr Compensator Performance Using Individual Channel Analysis and Design

ENERGYO ◽  
2018 ◽  
Author(s):  
Carlos Ernesto Ugalde Loo ◽  
Enrique Acha ◽  
Eduardo Liceaga-Castro ◽  
Jesus U. Liceaga Castro
Keyword(s):  
Fundamental Analysis ◽  
Static Var Compensator ◽  
Analysis And Design ◽  
Channel Analysis
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