scholarly journals Delamination Detection in Bimetallic Composite Using Laser Ultrasonic Bulk Waves

2021 ◽  
Vol 11 (2) ◽  
pp. 636
Author(s):  
Baoping Ji ◽  
Qingdong Zhang ◽  
Jianshu Cao ◽  
Boyang Zhang ◽  
Liyuan Zhang
Keyword(s):  
Numerical Simulation ◽  
Laser Ultrasonic ◽  
Bimetallic Composite ◽  
Ultrasound Field ◽  
Detection Point ◽  
Bulk Waves ◽  
Composite Interface ◽  
On Line ◽  
Copper Aluminum ◽  
Selection Of

In this study, a method based on laser ultrasonic bulk waves is used to detect delamination in a bimetallic composite. For this purpose, several artificial delamination defects were created in a copper-aluminum sample using wire-electrode cutting. The research includes numerical simulation and experimental analysis. The propagation process of laser ultrasonic in Cu/Al bimetallic composite, the interaction between bulk waves and composite interface, and the effect of delamination defects on the ultrasound field were studied by numerical simulation. Suitable parameters and features were determined by numerical simulation, which provided a basis for the parameter selection of experimental research. The reflected shear waves from the composite interface can act as a sensitive feature to detect the delamination in Cu/Al bimetallic composites. The distance between the detection point and the excitation point was set to 2 mm to take into account the detection resolution and efficiency. The experimental results were in good agreement with the simulation results, and the C-scan image can intuitively show the location and size of delamination defects. The detection method based on laser ultrasonic bulk waves can effectively detect the delamination in Cu/Al bimetallic composite, which is suitable for the on-line detection of the rolling composite process.

Selection of one-dimensional sedimentation: models for on-line use

1995 ◽  
Vol 31 (2) ◽  
pp. 193-204 ◽  
Author(s):  
Koen Grijspeerdt ◽  
Peter Vanrolleghem ◽  
Willy Verstraete
Keyword(s):  
Steady State ◽  
Selection Criteria ◽  
Data Sets ◽  
Concentration Profiles ◽  
A Posteriori ◽  
One Dimensional ◽  
On Line ◽  
Dynamic Concentration ◽  
Selection Of ◽  
Modelling Task

A comparative study of several recently proposed one-dimensional sedimentation models has been made. This has been achieved by fitting these models to steady-state and dynamic concentration profiles obtained in a down-scaled secondary decanter. The models were evaluated with several a posteriori model selection criteria. Since the purpose of the modelling task is to do on-line simulations, the calculation time was used as one of the selection criteria. Finally, the practical identifiability of the models for the available data sets was also investigated. It could be concluded that the model of Takács et al. (1991) gave the most reliable results.

scholarly journals ProReal®: The ‘good enough’ online alternative to face-to-face Dramatherapy

Dramatherapy ◽  
2021 ◽  
pp. 026306722110208
Author(s):  
Claire Anne Quigley
Keyword(s):  
Ambiguity Tolerance ◽  
Face To Face ◽  
On Line ◽  
And Control ◽  
Selection Of

The Covid-19 restrictions have limited the access of face-to face therapies for many people and continues to effect how Dramatherapists operate. The following article offers reflections around adapting to an on-line medium, focusing more specifically around the software of ProReal. Limitations and considerations are acknowledged, including technological difficulties, computer efficacy, ambiguity tolerance and the need for careful contracting and reassurance of autonomy and control when using on-line platforms. The article ends with a short selection of vignettes from ProReal sessions.

Numerical simulation studies of Cs3Bi2I9 perovskite solar device with optimal selection of electron and hole transport layers

Optik ◽  
2021 ◽  
Vol 231 ◽  
pp. 166417 ◽  
Author(s):  
Md Tohidul Islam ◽  
Md Rafsun Jani ◽  
Kazi Md Shorowordi ◽  
Zameer Hoque ◽  
Ali Mucteba Gokcek ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Hole Transport ◽  
Optimal Selection ◽  
Simulation Studies ◽  
Hole Transport Layers ◽  
Selection Of

scholarly journals Procedure for the Selection of Rubber Compound in Rubber-Metal Springs for Vibration Isolation

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1737
Author(s):  
Milan Banić ◽  
Dušan Stamenković ◽  
Aleksandar Miltenović ◽  
Dragan Jovanović ◽  
Milan Tica
Keyword(s):  
Numerical Simulation ◽  
Constitutive Model ◽  
Vibration Isolation ◽  
Correct Selection ◽  
Virtual Experiment ◽  
Rubber Compound ◽  
Key Factor ◽  
Railway Engineering ◽  
Selection Of

The selection of a rubber compound has a determining influence on the final characteristics of rubber-metal springs. Therefore, the correct selection of a rubber compound is a key factor for development of rubber-metal vibration isolation springs with required characteristics. The procedure for the selection of the rubber compound for vibration isolation of rubber-metal springs has been proposed, so that the rubber-metal elements have the necessary characteristics, especially in terms of deflection. The procedure is based on numerical simulation of spring deflection with Bergström-Boyce constitutive model in virtual experiment, with a goal to determine which parameters of the constitutive model will lead to spring required deflection. The procedure was verified by case study defined to select rubber compound for a rubber–metal spring used in railway engineering.

On-line selection of rough machining parameters

2004 ◽  
Vol 149 (1-3) ◽  
pp. 256-262 ◽  
Author(s):  
Joško Valentinčič ◽  
Mihael Junkar
Keyword(s):  
Machining Parameters ◽  
Rough Machining ◽  
On Line ◽  
Line Selection ◽  
Selection Of

Flank Milling for Blisk with a Barrel Ball Milling Cutter

2009 ◽  
Vol 407-408 ◽  
pp. 202-206
Author(s):  
Tian Li ◽  
Wu Yi Chen ◽  
Ru Feng Xu ◽  
Dan Wang
Keyword(s):  
Numerical Simulation ◽  
Ball Milling ◽  
Strip Width ◽  
Flank Milling ◽  
Location Strategy ◽  
Milling Cutter ◽  
Machining Strip Width ◽  
Blisk Blade ◽  
Blade Machining ◽  
Selection Of

To satisfy the requirement in blisk machining, a barrel-ball milling (BBM) cutter suitable for machining both blade and hub is presented in this paper. The selection of cutter parameter and calculation of cutter location were put forward. The new efficient machining cutter location via the advanced optimization on cutter machining strip width was gained. By the numerical simulation of blisk blade machining, the feasibility of the BBM cutter and cutter location strategy were verified. The result showed that the efficiency of this method was increased to more than three times compared to the machining with a ball cutter.

Numerical simulation of aberrated medical ultrasound signals

2018 ◽  
Vol 33 (5) ◽  
pp. 277-288 ◽  
Author(s):  
Katerina A. Beklemysheva ◽  
Georgiy K. Grigoriev ◽  
Nikolay S. Kulberg ◽  
Igor B. Petrov ◽  
Aleksey V. Vasyukov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Ultrasound Examination ◽  
Transcranial Ultrasound ◽  
Medical Ultrasound ◽  
Ultrasound Field ◽  
Acoustic Equations ◽  
Ultrasound Signal ◽  
Ultrasound Signals ◽  
B Scan Images

Abstract Transcranial ultrasound examination is hampered by the skull which acts as an irregular aberrator of the ultrasound signal. Numerical recovery of the ultrasound field can help in elimination of aberrations induced by the skull. In this paper, we address the simulation of medical phantom scanning through silicon aberrators with wave notching. The numerical model is based on the 2D acoustic equations which are solved by the wavefront construction raytracing method. Numerical B-scan images are compared with experimental B-scan images.

scholarly journals Surveillance Aesthetics in Latin America: Work in progress

2012 ◽  
Vol 10 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Fernanda Bruno ◽  
Paola Barreto ◽  
Milena Szafir
Keyword(s):  
Latin America ◽  
Los Angeles ◽  
Latin American ◽  
Satellite Images ◽  
Surveillance Culture ◽  
The Usa ◽  
On Line ◽  
And Control ◽  
Selection Of

This on line curatorship presents a selection of 11 works by Latin American artists who incorporate in their creations technologies traditionally linked to surveillance and control processes. By Surveillance Aesthetics we understand a compound of artistic practices, which include the appropriation of dispositifs such as closed circuit video, webcams, satellite images, algorithms and computer vision among others, placing them within new visibility, attention and experience regimes. The term referred to in the title of this exhibition is intended more as a vector of research rather than the determination of a field, as pointed by Arlindo Machado under the term “surveillance culture”. (Machado 1991) In this sense, a Latin America Surveillance Aesthetics exhibition is a way to propose, starting from the works presented here, a myriad of questions. How and to what extent do the destinies of surveillance devices reverberate or are subverted by market, security and media logics in our societies? If, in Europe and in the USA, surveillance is a subject related to the war against terror and border control, what can be said about Latin America? What forces and conflicts are involved? How have artistic practices been creating and acting in relation to these forces and conflicts? Successful panoramas of so called Surveillance Art already take place in Europe and North America for at least three decades, the exhibition “Surveillance”, at the Los Angeles Contemporary Exhibitions being one of the first initiatives in this domain. In Latin America however, art produced in the context of surveillance devices and processes is still seen as an isolated event. Our intention is to assemble a selection of works indicating the existence of a wider base of production, which cannot be considered eventual.The online exhibition can be accessed here.http://www.pec.ufrj.br/surveillanceaestheticslatina/

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