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2-D Defect Profile Reconstruction from Ultrasonic Guided Wave Signals Based on Radial Wavelet Basis Function Neural Network with ELM
(Switzerland: Trans Tech Publications, 2016), 14 page(s)
The reconstruction of defect profiles based on ultrasonic guided waves means the acquisition of defect profiles and parameters from ultrasonic guided wave signals. To achieve multi-resolution approximation, this paper proposed a reconstruction approach based on Radial Wavelet Basis Function Neural Network (RWBFNN)...
Sample
(Switzerland: Trans Tech Publications, 2016), 14 page(s)
Description
The reconstruction of defect profiles based on ultrasonic guided waves means the acquisition of defect profiles and parameters from ultrasonic guided wave signals. To achieve multi-resolution approximation, this paper proposed a reconstruction approach based on Radial Wavelet Basis Function Neural Network (RWBFNN), which combines wavelet analysis and neural network. Gaussian radial basis functions and Mexican hat wavelet frames are used as scalin...
The reconstruction of defect profiles based on ultrasonic guided waves means the acquisition of defect profiles and parameters from ultrasonic guided wave signals. To achieve multi-resolution approximation, this paper proposed a reconstruction approach based on Radial Wavelet Basis Function Neural Network (RWBFNN), which combines wavelet analysis and neural network. Gaussian radial basis functions and Mexican hat wavelet frames are used as scaling functions and wavelet functions respectively. The training and testing samples contain simulation data and experimental data. The input data sets are defect echo signals, and the output data sets are 2-D profile parameters. To reduce the training time and simplify the profile reconstruction procedure without losing accuracy, Extreme Learning Machine (ELM) is adopted simultaneously. The results indicate that significant advantages can be obtained over other defect profile reconstruction schemes, and the accuracy of the predicted defect profile can be controlled by the resolution of the network with the lower computational complexity.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
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2D Meso-Scale Finite Element Modeling and Simulation of Polymer-Mineral Composite Material
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Polymer-mineral composite material is prepared by using modified epoxy resin as binder and mineral particles as aggregates. Its excellent damping characteristic and low thermal expansion make it ideal in manufacturing machine tool beds. However, the properties of this material depend on its formula and structure,...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
Polymer-mineral composite material is prepared by using modified epoxy resin as binder and mineral particles as aggregates. Its excellent damping characteristic and low thermal expansion make it ideal in manufacturing machine tool beds. However, the properties of this material depend on its formula and structure, so it is very important to develop an efficient method to numerically model the materials and then to optimize their properties. In thi...
Polymer-mineral composite material is prepared by using modified epoxy resin as binder and mineral particles as aggregates. Its excellent damping characteristic and low thermal expansion make it ideal in manufacturing machine tool beds. However, the properties of this material depend on its formula and structure, so it is very important to develop an efficient method to numerically model the materials and then to optimize their properties. In this paper, 2D meso-scale finite element modeling is presented for numerical analysis of the mechanical properties of polymer-mineral composite material. The material was treated as a 2-phase composite composed of aggregates and binder which was epoxy resin mixed with fillers. Based on grading curve, the weights of aggregates were converted into the corresponding area, the aggregate particles were randomly generated and assembled with binder to produce the model. And then 2D numerical simulations were conducted under different gradations. The results show that: (1) the 2D FE model is very close to the real polymer-mineral composite material in the aspect of density and aggregate shapes and sizes, which validate the fidelity of the generated finite element model and numerical analysis method; (2) by comparing the materials' properties under four different gradations, it can be found that the materials with SAC gradation have the best mechanical property.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-03, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
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787s grounded, batteries cited
An image with some information published by the National Transportation Safety Board in 2013. Graphics done by Robert Dorrell.
Sample
Description
An image with some information published by the National Transportation Safety Board in 2013. Graphics done by Robert Dorrell.
Field of Study
Global Issues
Content Type
Infographic
Date Published / Released
2013
Topic / Theme
Mechanical engineering, Engineering
Discipline Perspective
Engineering
×
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Abnormal Grain Growth on the Surface of Cold-Rolled AA1235 Aluminum Plate during the Annealing Process
(Switzerland: Trans Tech Publications, 2017), 12 page(s)
AA1235 aluminum alloys were twin roll cast into a 7.0 mm-thick billet and further rolled into a plate with 70% reduction, followed by annealing at 500 C for 8 h. Abnormal grains were found to be formed on the plate bottom surface. SEM, EBSD, and micro X-ray diffraction were used to analyze the mechanism underlying...
Sample
(Switzerland: Trans Tech Publications, 2017), 12 page(s)
Description
AA1235 aluminum alloys were twin roll cast into a 7.0 mm-thick billet and further rolled into a plate with 70% reduction, followed by annealing at 500 C for 8 h. Abnormal grains were found to be formed on the plate bottom surface. SEM, EBSD, and micro X-ray diffraction were used to analyze the mechanism underlying the abnormal growth of these grains. Results showed that the {100} >001001
AA1235 aluminum alloys were twin roll cast into a 7.0 mm-thick billet and further rolled into a plate with 70% reduction, followed by annealing at 500 C for 8 h. Abnormal grains were found to be formed on the plate bottom surface. SEM, EBSD, and micro X-ray diffraction were used to analyze the mechanism underlying the abnormal growth of these grains. Results showed that the {100} >001< texture was formed in the surrounding normal grains adjacent to the abnormal grain. The orientation angle between the abnormal grain and its adjacent normal grains was 45°. The {100} >001< texture formed during rolling and annealing accelerated abnormal grain growth. The partially dissolved Fe precipitates were heterogeneously distributed in the plate bottom heterogeneously, which also mainly explained abnormal grain growth.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2017-06, 2017
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2017 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
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About the Possibility of Applying Coloured Soil-Cement in Making Road Pavement Layers
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
The issue of the urban environment decoration has continuously been the task of urban architecture authority and it is quite successfully performed. Adding pigments, using coloured filler in the content of bitumen-concrete mixtures or applying multi-coloured paving stones and mosaic rigid concrete pavements provid...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
The issue of the urban environment decoration has continuously been the task of urban architecture authority and it is quite successfully performed. Adding pigments, using coloured filler in the content of bitumen-concrete mixtures or applying multi-coloured paving stones and mosaic rigid concrete pavements provide additional positive impression in the perception of intra-buildings space and modern urban landscape. The use of local materials with...
The issue of the urban environment decoration has continuously been the task of urban architecture authority and it is quite successfully performed. Adding pigments, using coloured filler in the content of bitumen-concrete mixtures or applying multi-coloured paving stones and mosaic rigid concrete pavements provide additional positive impression in the perception of intra-buildings space and modern urban landscape. The use of local materials with adding pigments for the design of residential areas can be extremely important for local communities.In order to test soil-cement mixtures with added colour pigment for road pavements on the basis of construction laboratory at Lutsk NTU, a series of experiments has been planned to answer the question of the pigment amount impact on the physical and mechanical properties of the materials and finding the best ratios for them.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-09, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
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Accident Investigation Report, Comet 4 G-ADPN, Tel Aviv-Tehran, March 10, 1964
written by United Kingdom. Air Registration Board, in Air Registration Board, and Civil Aviation Authority, Safety Data and Analysis Unit: Accident Files (London, England: United Kingdom. National Archives at Kew, 1964, originally published 1964), 53 page(s)
This accident report outlines the investigative findings of the aircraft accident that occurred at the Tehran airport on March 9, 1964.
Sample
written by United Kingdom. Air Registration Board, in Air Registration Board, and Civil Aviation Authority, Safety Data and Analysis Unit: Accident Files (London, England: United Kingdom. National Archives at Kew, 1964, originally published 1964), 53 page(s)
Description
This accident report outlines the investigative findings of the aircraft accident that occurred at the Tehran airport on March 9, 1964.
Field of Study
Global Issues
Content Type
Accident report
Author / Creator
United Kingdom. Air Registration Board
Date Published / Released
1964
Publisher
United Kingdom. National Archives at Kew
Topic / Theme
BOAC Comet 4 G-ADPN Crash, Transportation accidents, Aircraft accidents, Aircraft, Aerospace engineering, Engineering
Copyright Message
Images reproduced by courtesy of The National Archives, London, England. www.nationalarchives.gov.uk. The National Archives give no warranty as to the accuracy, completeness or fitness for the purpose of the information provided. Images may be used only for purposes of research, private study or education. Applications for any other use should be made to The National Archives Image Library, Kew, R...
Images reproduced by courtesy of The National Archives, London, England. www.nationalarchives.gov.uk. The National Archives give no warranty as to the accuracy, completeness or fitness for the purpose of the information provided. Images may be used only for purposes of research, private study or education. Applications for any other use should be made to The National Archives Image Library, Kew, Richmond, Surrey TW9 4DU.
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Discipline Perspective
Engineering
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Acid-Base Properties of the Surface SnO
(Switzerland: Trans Tech Publications, 2015), 9 page(s)
The article demonstrates how acid-base properties of the surface of tin (II) oxide powders influence its photocatalytic activity in reaction of photodegradation of methylene blue. The experiment shows that the photocatalytic activity of the tin (II) oxide depends on the number and the strength of surface acid cent...
Sample
(Switzerland: Trans Tech Publications, 2015), 9 page(s)
Description
The article demonstrates how acid-base properties of the surface of tin (II) oxide powders influence its photocatalytic activity in reaction of photodegradation of methylene blue. The experiment shows that the photocatalytic activity of the tin (II) oxide depends on the number and the strength of surface acid centers of the Lewis.
Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-10, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
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Adaptable Material Coding Method for Product Lifecycle Management
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Accurate material data shared in product lifecycle is the basis of manufacturing industry informationization. But material coding rule is usually different in enterprises. The code rule definition model based on code segment unit was proposed, and the segment unit was divided into four types as flow, selection, in...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
Accurate material data shared in product lifecycle is the basis of manufacturing industry informationization. But material coding rule is usually different in enterprises. The code rule definition model based on code segment unit was proposed, and the segment unit was divided into four types as flow, selection, input and conversion according to code generating way. The concept of code segment structure tree was proposed to support the code method...
Accurate material data shared in product lifecycle is the basis of manufacturing industry informationization. But material coding rule is usually different in enterprises. The code rule definition model based on code segment unit was proposed, and the segment unit was divided into four types as flow, selection, input and conversion according to code generating way. The concept of code segment structure tree was proposed to support the code method's adaptability. The E-R model of adaptable coding system was described. The integration model of coding system, CAD, CAPP, PDM and ERP was put forward. Based on the model, generating code before design, generating code after design and generating code offline modes were proposed. Taking a specific material code rule in an enterprise as an example, the coding system's application method was studied. The example shows that the proposed coding method is adaptable and effective.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
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Adhesion Improvement of Nickel Electrodeposited on Aluminum Alloy 7075 by Modified Single Zincating Process
(Switzerland: Trans Tech Publications, 2016), 11 page(s)
The time-transition curve of open circuit potential (Eoc) during the single zincating process of aluminium alloy 7075 (AA7075) was recorded. Then, a suitable single zincating duration was selected from the Eoc slope, in order to get the optimum zincating duration. The evolution of surface morphology and compositio...
Sample
(Switzerland: Trans Tech Publications, 2016), 11 page(s)
Description
The time-transition curve of open circuit potential (Eoc) during the single zincating process of aluminium alloy 7075 (AA7075) was recorded. Then, a suitable single zincating duration was selected from the Eoc slope, in order to get the optimum zincating duration. The evolution of surface morphology and composition of AA7075 substrate at various single zincating durations were characterized by scanning electron microscopy (SEM) and energy dispers...
The time-transition curve of open circuit potential (Eoc) during the single zincating process of aluminium alloy 7075 (AA7075) was recorded. Then, a suitable single zincating duration was selected from the Eoc slope, in order to get the optimum zincating duration. The evolution of surface morphology and composition of AA7075 substrate at various single zincating durations were characterized by scanning electron microscopy (SEM) and energy dispersive analysis of x- rays (EDX). The coating adhesions of single zincated samples produced at various durations were investigated using a scratch tester. SEM results showed that the substrates produced at a longer zincating duration were fully covered by a dense layer of zinc particles. The adhesion of the electrodeposited nickel on single zincated samples produced at longer zincating duration was higher than the conventional single zincating process. This morphology has contributed to the improvement of coating adhesion.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
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Adjusting the Flexibility of Fabric Reinforced Composite Laminates Using Experimental Design
(Switzerland: Trans Tech Publications, 2015), 9 page(s)
The objective of our work is to improve the mechanical stiffness of fiber reinforced laminates. The stiffness can be characterized by flexural and tensile moduli or their derivation. We applied design of experiments (DOE) to achieve our goals, because to solve the existing analytical and numerical models is compli...
Sample
(Switzerland: Trans Tech Publications, 2015), 9 page(s)
Description
The objective of our work is to improve the mechanical stiffness of fiber reinforced laminates. The stiffness can be characterized by flexural and tensile moduli or their derivation. We applied design of experiments (DOE) to achieve our goals, because to solve the existing analytical and numerical models is complicated.We examined the effects of the following parameters: a) composition of reinforce materials (solely carbon, or carbon and glass co...
The objective of our work is to improve the mechanical stiffness of fiber reinforced laminates. The stiffness can be characterized by flexural and tensile moduli or their derivation. We applied design of experiments (DOE) to achieve our goals, because to solve the existing analytical and numerical models is complicated.We examined the effects of the following parameters: a) composition of reinforce materials (solely carbon, or carbon and glass combination), b) modulus of resin, c) mass ratio of resin-reinforcement, d) order of layers.The samples manufactured on the basis of DOE were investigated mechanically (flexural and tensile moduli measurements) and morphologically (scanning electron microscopy). We compared the measured modulus results to calculated values.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-02, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
Discipline Perspective
Engineering
×
