References of "Rappel, Hussein 50002907"
     in
Bookmark and Share    
Full Text
See detailDiscrete Multiscale Modelling and Future Research Plans concerning Metals
Beex, Lars UL; Bordas, Stéphane UL; Rappel, Hussein UL et al

Presentation (2014, October 14)

Detailed reference viewed: 130 (11 UL)
Full Text
Peer Reviewed
See detailNumerical Time-Domain Modeling of Lamb Wave Propagation Using Elastodynamic Finite Integration Technique
Rappel, Hussein UL; Yousefi-Koma, Aghil; Jalil, Jamali et al

in Shock and Vibration (2014), 2014

This paper presents a numerical model of lamb wave propagation in a homogenous steel plate using elastodynamic finite integration technique (EFIT) as well as its validation with analytical results. Lamb ... [more ▼]

This paper presents a numerical model of lamb wave propagation in a homogenous steel plate using elastodynamic finite integration technique (EFIT) as well as its validation with analytical results. Lamb wave method is a long range inspection technique which is considered to have unique future in the field of structural health monitoring. One of the main problems facing the lamb wave method is how to choose the most appropriate frequency to generate the waves for adequate transmission capable of properly propagating in the material, interfering with defects/damages, and being received in good conditions. Modern simulation tools based on numerical methods such as finite integration technique (FIT), finite element method (FEM), and boundary element method (BEM) may be used for modeling. In this paper, two sets of simulation are performed. In the first set, group velocities of lamb wave in a steel plate are obtained numerically. Results are then compared with analytical results to validate the simulation. In the second set, EFIT is employed to study fundamental symmetric mode interaction with a surface braking defect. [less ▲]

Detailed reference viewed: 142 (11 UL)
Full Text
Peer Reviewed
See detailShape control of Bio-inspired tail by shape memory alloy actuator: an experimental study
Rappel, Hussein UL; Yousefi-Koma, Aghil; Baseri, Hamid

Scientific Conference (2014, February 18)

Increase of quest for development of efficient and high quality Micro Aerial Vehicles (MAVs) has encouraged engineers to seek new ideas and applications using smart materials. Biomimetic mechanisms have ... [more ▼]

Increase of quest for development of efficient and high quality Micro Aerial Vehicles (MAVs) has encouraged engineers to seek new ideas and applications using smart materials. Biomimetic mechanisms have been proposed as solutions for increasing the efficiency of MAVs. In this paper an experimental study is performed on a bio-inspired tail, developed at the Advanced Dynamic & Control Systems Laboratory (ADCSL), University of Tehran and a PID controller is implemented on this tail. Results show that the implemented controller has successfully rejected disturbances in reference tracking using an acceptable level of energy for the control system. [less ▲]

Detailed reference viewed: 71 (4 UL)
Full Text
Peer Reviewed
See detailFundamental asymmetric lamb wave ( a0 ) interaction with rectangular notch using elastodynamic finite integration technique (EFIT)
Rappel, Hussein UL; Yousefi-Koma, Aghli

Scientific Conference (2013, May 07)

Fundamental asymmetric lamb wave’s interactions with rectangular notches in a steel plate are investigated in this paper. Elastodynamic finite integration technique previously mainly used to study wave ... [more ▼]

Fundamental asymmetric lamb wave’s interactions with rectangular notches in a steel plate are investigated in this paper. Elastodynamic finite integration technique previously mainly used to study wave propagation in elastic media is adopted to study lamb wave interaction with defects. Simulation examples are presented to illustrate the reflection and transmission coefficients’ variations with defect’s height, for both symmetric and asymmetric modes. Results show as the depth of notch increases reflection coefficients for both symmetric mode and asymmetric mode increase. However, when the depth of notch increases transmission coefficient for asymmetric mode decreases which means the main part of transmitted energy is carried by symmetric mode generated when the fundamental asymmetric mode interacts with defect. This simulation could be a valuable tool for the research of lamb wave’s applications in nondestructive testing (NDT) field, as the problem of lamb wave interaction with discontinuities can be used to study defect sizing problem. [less ▲]

Detailed reference viewed: 67 (6 UL)
Peer Reviewed
See detailDesign of a model predictive controller for welding robot under impact loading
Rappel, Hussein UL; Haeri Yazdi, Mohmmad Reza

Poster (2012, February 23)

Detailed reference viewed: 49 (2 UL)
Full Text
See detailBayesian inference for the stochastic identification of elastoplastic material parameters: Introduction, misconceptions and insights
Rappel, Hussein UL; Beex, Lars UL; Hale, Jack UL et al

E-print/Working paper (n.d.)

We discuss Bayesian inference (BI) for the probabilistic identification of material parameters. This contribution aims to shed light on the use of BI for the identification of elastoplastic material ... [more ▼]

We discuss Bayesian inference (BI) for the probabilistic identification of material parameters. This contribution aims to shed light on the use of BI for the identification of elastoplastic material parameters. For this purpose a single spring is considered, for which the stress-strain curves are artificially created. Besides offering a didactic introduction to BI, this paper proposes an approach to incorporate statistical errors both in the measured stresses, and in the measured strains. It is assumed that the uncertainty is only due to measurement errors and the material is homogeneous. Furthermore, a number of possible misconceptions on BI are highlighted based on the purely elastic case. [less ▲]

Detailed reference viewed: 342 (104 UL)