Time-domain identification of the elastic modulus of simply supported box girders under moving loads: Method and full-scale validation

2020 ◽  
Vol 215 ◽  
pp. 110619 ◽  
Author(s):  
Angelo Aloisio ◽  
Rocco Alaggio ◽  
Massimo Fragiacomo
Keyword(s):  
Elastic Modulus ◽  
Time Domain ◽  
Scale Validation ◽  
Full Scale ◽  
Moving Loads ◽  
Box Girders ◽  
Simply Supported ◽  
Domain Identification

Full-Scale Validation of a Vessel’s Station-Keeping Capability With DynCap

2017 ◽  
Author(s):  
Luca Pivano ◽  
Dong Nguyen ◽  
Øyvind Smøgeli
Keyword(s):  
Time Domain ◽  
Scale Validation ◽  
Operational Risk ◽  
Full Scale ◽  
Management Tools ◽  
Worst Case ◽  
Operational Risks ◽  
Steady Growth ◽  
Transient Period ◽  
Key Aspects

With the steady growth of the number of Dynamic Positioning (DP) vessels, increasingly complex designs and operations, and a decreasing number of experienced DP operators, effective operational risk management tools are key for safer and more efficient operations. One of the key aspects when looking at the operational risks is the estimation of the vessel position and heading after the worst case single failure and in the transient period after the failure has occurred. The aim of this paper is to provide insight about the use of comprehensive dynamic operability analyses performed by time-domain simulations for understanding the vessel performance and limitations, in turn providing valuable and reliable input to operational risk assessment and planning. This paper presents also a comparison with results from full-scale trials.

Time Domain Identification of Moving Loads on Bridge Deck

2003 ◽  
Vol 125 (2) ◽  
pp. 187-198 ◽  
Author(s):  
X. Q. Zhu ◽  
S. S. Law
Keyword(s):  
Time Domain ◽  
Orthotropic Plate ◽  
Bridge Deck ◽  
Vibration Mode ◽  
Plate Theory ◽  
Moving Loads ◽  
Regularization Technique ◽  
Domain Identification ◽  
Fixed Distance ◽  
Superposition Technique

A new time domain method is presented to identify moving loads on a bridge deck based on the measured responses. The bridge deck is modeled as an orthotropic plate and the loads are modeled as a group of four loads moving on top of the bridge deck at fixed distance apart. Dynamic behavior of the bridge deck is analyzed by the orthotropic plate theory and mode superposition technique. Like all inverse problems, this identification is an ill-conditioned problem, and a regularization technique is employed to stabilize the computations. The identified loads moving at different eccentricities are presented. Laboratory work on the force identification is also presented. The effect of incomplete measured modes in the responses is discussed, and an underestimation in the loads may result if the number of vibration mode for identification is larger than that in the responses. Computational simulations and laboratory tests show that the method is effective and practical for identification of individual wheel loads on bridge decks.

scholarly journals Design framework for DEM-supported prototyping of grabs including full-scale validation

2021 ◽  
Vol 96 ◽  
pp. 29-43
Author(s):  
Dingena Schott ◽  
Javad Mohajeri ◽  
Jovana Jovanova ◽  
Stef Lommen ◽  
Wilbert de Kluijver
Keyword(s):  
Scale Validation ◽  
Full Scale ◽  
Design Framework

A Frequency Domain Versus a Time Domain Identification Technique for Nonlinear Parameters Applied to Wire Rope Isolators

2000 ◽  
Vol 123 (4) ◽  
pp. 645-650 ◽  
Author(s):  
Gaetan Kerschen ◽  
Vincent Lenaerts ◽  
Stefano Marchesiello ◽  
Alessandro Fasana
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Nonlinear Dynamical Systems ◽  
Wire Rope ◽  
Restoring Force ◽  
Nonlinear Parameters ◽  
Nonlinear Dynamical ◽  
Domain Identification ◽  
Identification Technique ◽  
Reverse Path Method

The present paper aims to compare two techniques for identification of nonlinear dynamical systems. The Conditioned Reverse Path method, which is a frequency domain technique, is considered together with the Restoring Force Surface method, a time domain technique. Both methods are applied for experimental identification of wire rope isolators and the results are compared. Finally, drawbacks and advantages of each technique are underlined.

scholarly journals Synchronous machine parameter identification in frequency and time domain

2007 ◽  
Vol 4 (1) ◽  
pp. 51-69 ◽  
Author(s):  
M. Hasni ◽  
S. Djema ◽  
O. Touhami ◽  
R. Ibtiouen ◽  
M. Fadel ◽  
...  
Keyword(s):  
Time Domain ◽  
Synchronous Machine ◽  
Model Structure ◽  
Machine Parameter ◽  
Identification Procedure ◽  
Time Constants ◽  
Domain Identification ◽  
Salient Pole ◽  
Salient Pole Synchronous Machine ◽  
Input Signals

This paper presents the results of a frequency and time-domain identification procedure to estimate the linear parameters of a salient-pole synchronous machine at standstill. The objective of this study is to use several input signals to identify the model structure and parameters of a salient-pole synchronous machine from standstill test data. The procedure consists to define, to conduct the standstill tests and also to identify the model structure. The signals used for identification are the different excitation voltages at standstill and the flowing current in different windings. We estimate the parameters of operational impedances, or in other words the reactance and the time constants. The tests were carried out on synchronous machine of 1.5 kVA 380V 1500 rpm.

scholarly journals Spatial time domain reflectometry and its application for the measurement of water content distributions along flat ribbon cables in a full-scale levee model

2009 ◽  
Vol 45 (4) ◽  
Author(s):  
Alexander Scheuermann ◽  
Christof Huebner ◽  
Stefan Schlaeger ◽  
Norman Wagner ◽  
Rolf Becker ◽  
...  
Keyword(s):  
Water Content ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Full Scale
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