2012 International Conference on Engineering and Technology (ICET)最新文献_第3页

DIMOX and rheocasting induce Aluminum foam composite materials DIMOX和流变铸造诱导泡沫铝复合材料

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396141

B. Rabeeh

引用次数: 0

Digital IIR filters with minimal group delay for real-time applications 数字IIR滤波器与最小的组延迟实时应用

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396136

S. Skogstad, S. Holm, M. Høvin

{"title":"Digital IIR filters with minimal group delay for real-time applications","authors":"S. Skogstad, S. Holm, M. Høvin","doi":"10.1109/ICENGTECHNOL.2012.6396136","DOIUrl":"https://doi.org/10.1109/ICENGTECHNOL.2012.6396136","url":null,"abstract":"In this paper we examine the potential for designing digital (IIR) filters with minimal group delay, which are relevant for real-time applications. By formulating filter design as a multi-objective optimization problem and approaching it with an unbiased metaheuristic search algorithm, we have established relationships between filter delay and other filter objectives. These relationships are presented as non-inferior surfaces for different filter orders and design approaches. We present possible designs that are realizable with (1) classical IIR design constructions, and (2) unconstrained global search for filter orders between 2 and 5. Elliptical (Cauer) filters are found as to have the highest potential for low group delay among the classical constructions. However, as one might expect, unconstrained IIR search discovers more optimal filters, but is limited to filter orders of ~5. Currently, there exists no established method that can construct similar IIR filters with a group delay below n/2, where n is the given filter order. Finally, we present some unconstrained filter examples that we claim are nearly optimal.","PeriodicalId":149484,"journal":{"name":"2012 International Conference on Engineering and Technology (ICET)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126166595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Characterization of mechanical and corrosion behavior of low-nickel cobalt-free maraging steel alloys 低镍无钴马氏体时效钢合金的力学和腐蚀性能表征

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396126

A. M. El-Aziz, A. Fathy, A. M. Hassan, G. I. Youssef

{"title":"Characterization of mechanical and corrosion behavior of low-nickel cobalt-free maraging steel alloys","authors":"A. M. El-Aziz, A. Fathy, A. M. Hassan, G. I. Youssef","doi":"10.1109/ICENGTECHNOL.2012.6396126","DOIUrl":"https://doi.org/10.1109/ICENGTECHNOL.2012.6396126","url":null,"abstract":"Three different samples of maraging steel alloys were characterized before and after aging process. Optical microscopy and SEM investigation have shown a clear precipitation as a result of the aging process. The EDX analysis supports the hypothesis of the formation of titanium and molybdenum rich precipitates at the grain boundaries after aging. The mechanical properties of the steel alloys were tested at room temperature as well as at elevated temperatures. High values of mechanical properties were obtained at room temperature. Nevertheless, the mechanical properties of the steel alloys dropped severely at elevated temperatures due to the austenite reversion phenomenon. This may also explain the high ductility in the material at elevated temperatures resulting in the high values of elongation which exceeded 50% in some samples and the significant drop in the values of the modulus of elasticity. The increase in the titanium mass percentage caused an increase in the value of hardness; however, it resulted in the embrittlement of the material and lowering the values of impact toughness. The corrosion behaviour of the alloys was tested in 3.5% NaCl. The solution treated samples have shown a more passive behavior than the aged samples did; however, the aging process has resulted in a significant enhancement of the corrosion resistances of the alloys.","PeriodicalId":149484,"journal":{"name":"2012 International Conference on Engineering and Technology (ICET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130109861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of rolling conditions on ferrite refinement of low-carbon steel 轧制条件对低碳钢铁素体细化的影响

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396159

Ahmed El-Kawas, S. Ataya, S. Ibrahim

{"title":"Effect of rolling conditions on ferrite refinement of low-carbon steel","authors":"Ahmed El-Kawas, S. Ataya, S. Ibrahim","doi":"10.1109/ICENGTECHNOL.2012.6396159","DOIUrl":"https://doi.org/10.1109/ICENGTECHNOL.2012.6396159","url":null,"abstract":"Refinement of the ferrite grains provides a promising approach to simultaneously improving both the strength and the toughness of steels. Among recent techniques to obtain ultrafine ferrite, dynamic strain induced transformation (DSIT) is used. This type of treatment is sensitive to steel composition, deformation temperature, the prior austenite grain size, strain and cooling rate. This work is aiming to improve the mechanical properties of steels using ferrite grain refining through trials on industrial scale using a compact strip production plant (CSP) with hot strip mill (HSM) containing six stands F1-F6 in EZDK Steel Company. The chemical composition of the trials was C (~0.046), Si (0.073) Mn (0.50) and Ti (0.008). The effect of final deformation temperature of 750, 775, 800 and 815°C on the microstructure and mechanical properties was studied. In addition the effect of strain rate variation at the final two rolling stands was correlated with the ferrite refining mechanisms. The ferrite grain size attained after refining varies from 10 μm to be 6 μm. Yield and tensile strength increased slightly through changing deformation temperature, with the advantage of keeping almost the original high ductility. Toughness of the processed steel increased with ferrite grain refining.","PeriodicalId":149484,"journal":{"name":"2012 International Conference on Engineering and Technology (ICET)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127586815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical study of the influence of mold filling conditions on the as-cast structure of Al-4 wt.% Cu ingots 充型条件对al - 4wt .% Cu铸锭铸态组织影响的数值研究

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396110

M. Ahmadein, M. Wu, A. Ludwig

{"title":"Numerical study of the influence of mold filling conditions on the as-cast structure of Al-4 wt.% Cu ingots","authors":"M. Ahmadein, M. Wu, A. Ludwig","doi":"10.1109/ICENGTECHNOL.2012.6396110","DOIUrl":"https://doi.org/10.1109/ICENGTECHNOL.2012.6396110","url":null,"abstract":"In the last few decades research efforts were conducted to grasp good understanding about the origin of equiaxed and columnar grains formed during solidification. The morphological evolutions such as globular/cellular to dendritic or columnar-to-equiaxed transition were generally studied. Correspondingly, some empirical models were introduced. Nevertheless, no sufficient attention was paid to incorporation of such models together with macroscopic phenomena. A 5-phase mixed columnar-equiaxed solidification model recently proposed by the current authors was used to predict the macrostructure formation. However previous results showed that the initial melt conditions can influence the predicted structure particularly at low pouring temperature. In the current work, the impact of mold filling conditions on the final solidification structure is numerically verified in two stages: during pouring using 3-phase globular-equiaxed model; and after filling using the 5-phase mixed columnar-equiaxed model. The calculated results are compared to the as-cast structures obtained from experiments. The results demonstrated the significance of the `big bang' nucleation and the `premature' solidification occurred during pouring at low melt superheat on the as-cast structure.","PeriodicalId":149484,"journal":{"name":"2012 International Conference on Engineering and Technology (ICET)","volume":"09 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124444310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparison between different decoder algorithms for quasi orthogonal space time codes 准正交空时码不同译码算法的比较

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396149

Eman Hamdan, O. Alim, N. Korany

引用次数: 0

Steel foam: Heat treatment, mechanical and corrosion behavior 泡沫钢:热处理，机械和腐蚀行为

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396144

A. Fathy, M. Kamal, A. Klingner, A. E. El Aziz, E. Saif

{"title":"Steel foam: Heat treatment, mechanical and corrosion behavior","authors":"A. Fathy, M. Kamal, A. Klingner, A. E. El Aziz, E. Saif","doi":"10.1109/ICENGTECHNOL.2012.6396144","DOIUrl":"https://doi.org/10.1109/ICENGTECHNOL.2012.6396144","url":null,"abstract":"Metal foams are a class of materials with extremely low densities and an outstanding combination of mechanical, electrical, thermal, and acoustic properties. They offer a large potential for light-weight structures with high stiffness and high mechanical properties, energy absorption, and thermal management. Their extraordinary property combinations make them interesting for applications where more than one function can be met. Steel foam produced by slip reaction foam sintering process (SRFS) had a chemical composition of 1%C, 1.3 %Mn, 0.5% Si and 0.5 % Cr is subjected to many different heat treatment and corrosion conditions. In the presented work, the effect of different heat treatment conditions was applied to investigate its effect on the mechanical behavior of produced steel foam. Austenizing at 800, 850 and 900 degree Celsius for one hour was applied and tempering at 400, 450 and 500 for one hour respectively was examined. Corrosion characterization for the samples was carried out by using the salt spray test; samples were subjected to marine \"corrosive\" atmosphere for 54 hours at 40 degrees Celsius and by using the autoclave (high temperature/high pressure) samples were subjected to steam of distilled water at high pressure and high temperature reached 170 degrees Celsius for 96 hours. Compression test was carried out to test and evaluate the mechanical properties for the samples, before and after corrosion tests also before and after heat treatment process. The results showed that corrosion can negatively affects the mechanical properties of the steel foam, as in the compression test the samples which was not subjected to any of the corrosive atmosphere showed much better results than the samples which was tested in the salt spray or the autoclave test. Not only but also heat treatment process showed a great influence on the mechanical behavior of steel foam, as using different heat treatment cycle, better compression stress could be achieved.","PeriodicalId":149484,"journal":{"name":"2012 International Conference on Engineering and Technology (ICET)","volume":"217 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122459457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Genetic Algorithm for solving Multi-objective Facility Layout Problem (MOFLP) 求解多目标设施布局问题的遗传算法

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396132

M. E. Shedeed, S. A. Barr

引用次数: 2

Automated inspection planning system for CMMs 三坐标测量机自动检测计划系统

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396139

H. A. Hussien, A. Youssef, M. Shoukry

{"title":"Automated inspection planning system for CMMs","authors":"H. A. Hussien, A. Youssef, M. Shoukry","doi":"10.1109/ICENGTECHNOL.2012.6396139","DOIUrl":"https://doi.org/10.1109/ICENGTECHNOL.2012.6396139","url":null,"abstract":"Coordinate measuring machines (CMMs) have been recognized as a powerful tool for inspection and measurement purposes. Maximum utilization of CMMs requires the development of an automated inspection planning system. A computer-aided inspection planning (CAIP) system leads to minimization of the total time needed for inspection process and hence the overall cost of the final product. This work introduces a computer aided inspection system that reads a B-rep solid model in SAT format as an input and produces the final CMM program in DMIS format. The system includes the following: rule-based feature recognition module that identifies and extracts the necessary inspection features from the solid model, sampling strategy module to determine the number and the location of the needed measuring points on each inspection feature, accessibility analysis module to determine the number of probe orientations that can reach the measured points without collision, finally, a clustering module to minimize the total number of probe orientations need to fully inspect the entire part. All algorithms are developed using ACIS geometric kernel and object oriented programming using C++. The results are verified on CMM.","PeriodicalId":149484,"journal":{"name":"2012 International Conference on Engineering and Technology (ICET)","volume":"134 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133720228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

A new key management protocol for remote sensing satellite with multi ground stations 一种新的多地面站遥感卫星密钥管理协议

2012 International Conference on Engineering and Technology (ICET) Pub Date : 2012-12-31 DOI: 10.1109/ICENGTECHNOL.2012.6396163

H. Habbak, N. Hamdy, K. Shehata

引用次数: 0