Pub Date : 2023-09-18DOI: 10.34257/gjreevol23is2pg23
Hélio Luiz Simonetti, Valério S. Almeida, Virgil Del Duca Almeida, Luttgardes de Oliveira Neto, Marlan D. S. Cutrim, Vitor Manuel A. Leitão
This article presents the analysis of Strut-and-Tie Model (STM) in reinforced concrete 3D structures based on the study of topological optimization, so that the problem is formulated with the Smooth-ESO (SESO) discrete method, whose removal heuristic is bidirectional with discrete optimization procedure, and the Velocity Field Level Set Method (VFLSM), which is an inheritance of the classical continuum Level Set Method (LSM), but advances the design limits with a velocity field constructed from the rate of the design variables and base functions. The proposed approach is to couple both methods in conjunction with the Method of Moving Asymptotes (MMA), used to control the various design constraints that are the minimization of compliance and the Von Mises stress that has demonstrated more rational STM results. Additionally, it has been formulated a methodology for the automatic generation of optimal of 3D STM by using sensitivity analysis obtaining via derivatives of the Von Mises stress fields, finding the force paths prevailing compression in the directions of the strut and the tensile in the directions of the ties for the reinforcement insertion. All the codes are implemented with Matlab software and several comparison examples: Deep beam with opening, a pile cap, a bridge pier, and a single corbel, are presented to validate the present formulations and the results are compared with the literature
{"title":"Topology Optimization: Applications of VFLSM and SESO in the Generation of Three-Dimensional Strut-and-Tie Models","authors":"Hélio Luiz Simonetti, Valério S. Almeida, Virgil Del Duca Almeida, Luttgardes de Oliveira Neto, Marlan D. S. Cutrim, Vitor Manuel A. Leitão","doi":"10.34257/gjreevol23is2pg23","DOIUrl":"https://doi.org/10.34257/gjreevol23is2pg23","url":null,"abstract":"This article presents the analysis of Strut-and-Tie Model (STM) in reinforced concrete 3D structures based on the study of topological optimization, so that the problem is formulated with the Smooth-ESO (SESO) discrete method, whose removal heuristic is bidirectional with discrete optimization procedure, and the Velocity Field Level Set Method (VFLSM), which is an inheritance of the classical continuum Level Set Method (LSM), but advances the design limits with a velocity field constructed from the rate of the design variables and base functions. The proposed approach is to couple both methods in conjunction with the Method of Moving Asymptotes (MMA), used to control the various design constraints that are the minimization of compliance and the Von Mises stress that has demonstrated more rational STM results. Additionally, it has been formulated a methodology for the automatic generation of optimal of 3D STM by using sensitivity analysis obtaining via derivatives of the Von Mises stress fields, finding the force paths prevailing compression in the directions of the strut and the tensile in the directions of the ties for the reinforcement insertion. All the codes are implemented with Matlab software and several comparison examples: Deep beam with opening, a pile cap, a bridge pier, and a single corbel, are presented to validate the present formulations and the results are compared with the literature","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135149780","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}
The world's strong economic growth and increasing populations have generated a remarkably growing demand for resources, especially energy. Current conventional sources cannot meet the future needs. Efforts are being focused on renewable energies, deep-sea oil and the development of new techniques to value heavy oils, tar sands and oil shale. This could bridge the gap between energy demand and supply. Several countries with oil shale deposits have launched projects to examine the possibility of exploiting these deposits. Morocco is one of these countries, with significant oil shale deposits in the Middle Atlas (Timahdit), Tarfaya, Tangier and Grand Atlas regions (Fig. 1) [1]. Morocco has a reserve of around 53 billion barrels of oil shale, in addition to a rich capacity for shale gas and oil. The exploration works for these unconventional hydrocarbons, which began several years ago, has proved highly encouraging. The first research into the development of oil shale in Morocco began in Tangier, with the creation of the oil shale company of Tangier. The company built a pilot plant with a daily capacity of 80 tons of oil shale. The Timahdit and Tarfaya deposits were discovered in the 1960’s.
{"title":"The use of Oil Shale for Road Coating","authors":"Mohamed Amine Alouani, Dennoun Saifaoui, Abdelkader Alouani, Younes Alouani","doi":"10.34257/gjreevol23is2pg43","DOIUrl":"https://doi.org/10.34257/gjreevol23is2pg43","url":null,"abstract":"The world's strong economic growth and increasing populations have generated a remarkably growing demand for resources, especially energy. Current conventional sources cannot meet the future needs. Efforts are being focused on renewable energies, deep-sea oil and the development of new techniques to value heavy oils, tar sands and oil shale. This could bridge the gap between energy demand and supply. Several countries with oil shale deposits have launched projects to examine the possibility of exploiting these deposits. Morocco is one of these countries, with significant oil shale deposits in the Middle Atlas (Timahdit), Tarfaya, Tangier and Grand Atlas regions (Fig. 1) [1]. Morocco has a reserve of around 53 billion barrels of oil shale, in addition to a rich capacity for shale gas and oil. The exploration works for these unconventional hydrocarbons, which began several years ago, has proved highly encouraging. The first research into the development of oil shale in Morocco began in Tangier, with the creation of the oil shale company of Tangier. The company built a pilot plant with a daily capacity of 80 tons of oil shale. The Timahdit and Tarfaya deposits were discovered in the 1960’s.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135149775","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}
Pub Date : 2021-08-25DOI: 10.34257/GJREFVOL21IS3PG31
T. L. Hemminger
This paper describes a high-resolution analog acceleration and vibration amplifier for use with 8 piezoelectric polyvinylidene fluoride (PVDF) sensors. The purpose of this system is to 9 monitor automated parts placement on integrated circuit boards. One of the problems facing 10 production and inspection equipment is the occurrence of resonant and ambient vibrations. 11 Even small errors can cause systems with micrometer and nanometer precision to exceed 12 design tolerances. This work describes a method to monitor mechanical vibrations through a 13 portable and inexpensive signal-processing unit. The system provides user-selectable gain and filtering modules that are compact and reliable. PVDF is currently used in sensing applications, and its material properties have proven very useful for sensing mechanical stress, strain, pressure, and temperature
{"title":"A High-Precision Low-Cost Analog Acceleration and Vibration Amplifier using PVDF Piezoelectric Sensors","authors":"T. L. Hemminger","doi":"10.34257/GJREFVOL21IS3PG31","DOIUrl":"https://doi.org/10.34257/GJREFVOL21IS3PG31","url":null,"abstract":"This paper describes a high-resolution analog acceleration and vibration amplifier for use with 8 piezoelectric polyvinylidene fluoride (PVDF) sensors. The purpose of this system is to 9 monitor automated parts placement on integrated circuit boards. One of the problems facing 10 production and inspection equipment is the occurrence of resonant and ambient vibrations. 11 Even small errors can cause systems with micrometer and nanometer precision to exceed 12 design tolerances. This work describes a method to monitor mechanical vibrations through a 13 portable and inexpensive signal-processing unit. The system provides user-selectable gain and filtering modules that are compact and reliable. PVDF is currently used in sensing applications, and its material properties have proven very useful for sensing mechanical stress, strain, pressure, and temperature","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86619452","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}
Pub Date : 2021-08-25DOI: 10.34257/GJREFVOL21IS3PG1
L. Bibbò, Karim Khan, A. Tareen
Silk, seen as a material, is a fiber made from silkworm cocoons and spiders. They have 8 standard structural components and hierarchical structures. Different manufacturing 9 techniques allow obtaining silk in films, fibers, hydrogels, microspheres, and sponges. We can 10 tune the properties through the structure of secondary proteins. The paper explores the 11 application in biomedical, optics, and electronic fields by analyzing the technological trend. graft, graft, group rats, by using in the mucous between hard palate of right jaw and alveolar scaffold mixing an aqueous silk fibroin solution, refined, granular hydroxyapatite at 10: 1 509 sterilized by with gamma rays after freeze-drying three days. pretreated scaffold was to and grafted into the created The mucosa was sutured using Inspections were carried out every four weeks from the fourth to the to verify the state of growth of the new tissues. used different types of analysis, visual analysis, tissue analysis, and CT of the 513 bone defect; in the they used the Western Blot technique to verify the degree of bone generation. The found that mature osteoids appear at the eighth week and only at the twelfth week, observed through the bone tissue analysis, forming bone cells. Moreover, observed that in the samples in which the scaffolds were present, the generation was faster, and there was constant ossification in all parts of the defect, including the center. The new bone is generated via two processes, osteoinduction, and osteoconduction, and center of the bone defect. equipped with carbon nanotubes to provide further toughness and PEDOT: PSS electrically enhance it. Electro- 821 tendon subjected to tests for more than 40,000 flexion-elongation cycles, it turned out tough and durable. It 822 did not show variations in conductivity; mounted on a robot enabled the finger to handle different objects. This 823 tendon represents the most suitable solution for solving the need for a robotic finger to have the same fiber for both 824 the transmission of activation and detection signals. In the experiment reported, the researchers used biobased 825 carbons as a conductive filler to make SF biomaterial conductive [144]. They obtained this material called hydro 826 char [145] from the aqueous thermochemical process (HTP) that transforms the biomass into a carbonaceous solid 827 (biocarbon-HC). Then they converted it, by physical activation, into conductive biobased carbon. By acting on 828 the HTP parameters, it is possible to adjust their nanostructure and their chemical functionality. The bio-based 829 carbon can be rapidly doped with polar functionalities, adding oxygen and nitrogen, promoting dispersion in 830 silk fiber suspensions. They studied the effects produced by the variation of the dopant elements. Bio-based 831 carbons thus obtained dissolve in formic acid with CaCl2 silk fibers to produce thin films. The films are flexible 832 and stretchable at room temperature and humidity of 50%. T
{"title":"The Silk, Versatile Material for Biological, Optical, and Electronic Fields: Review","authors":"L. Bibbò, Karim Khan, A. Tareen","doi":"10.34257/GJREFVOL21IS3PG1","DOIUrl":"https://doi.org/10.34257/GJREFVOL21IS3PG1","url":null,"abstract":"Silk, seen as a material, is a fiber made from silkworm cocoons and spiders. They have 8 standard structural components and hierarchical structures. Different manufacturing 9 techniques allow obtaining silk in films, fibers, hydrogels, microspheres, and sponges. We can 10 tune the properties through the structure of secondary proteins. The paper explores the 11 application in biomedical, optics, and electronic fields by analyzing the technological trend. graft, graft, group rats, by using in the mucous between hard palate of right jaw and alveolar scaffold mixing an aqueous silk fibroin solution, refined, granular hydroxyapatite at 10: 1 509 sterilized by with gamma rays after freeze-drying three days. pretreated scaffold was to and grafted into the created The mucosa was sutured using Inspections were carried out every four weeks from the fourth to the to verify the state of growth of the new tissues. used different types of analysis, visual analysis, tissue analysis, and CT of the 513 bone defect; in the they used the Western Blot technique to verify the degree of bone generation. The found that mature osteoids appear at the eighth week and only at the twelfth week, observed through the bone tissue analysis, forming bone cells. Moreover, observed that in the samples in which the scaffolds were present, the generation was faster, and there was constant ossification in all parts of the defect, including the center. The new bone is generated via two processes, osteoinduction, and osteoconduction, and center of the bone defect. equipped with carbon nanotubes to provide further toughness and PEDOT: PSS electrically enhance it. Electro- 821 tendon subjected to tests for more than 40,000 flexion-elongation cycles, it turned out tough and durable. It 822 did not show variations in conductivity; mounted on a robot enabled the finger to handle different objects. This 823 tendon represents the most suitable solution for solving the need for a robotic finger to have the same fiber for both 824 the transmission of activation and detection signals. In the experiment reported, the researchers used biobased 825 carbons as a conductive filler to make SF biomaterial conductive [144]. They obtained this material called hydro 826 char [145] from the aqueous thermochemical process (HTP) that transforms the biomass into a carbonaceous solid 827 (biocarbon-HC). Then they converted it, by physical activation, into conductive biobased carbon. By acting on 828 the HTP parameters, it is possible to adjust their nanostructure and their chemical functionality. The bio-based 829 carbon can be rapidly doped with polar functionalities, adding oxygen and nitrogen, promoting dispersion in 830 silk fiber suspensions. They studied the effects produced by the variation of the dopant elements. Bio-based 831 carbons thus obtained dissolve in formic acid with CaCl2 silk fibers to produce thin films. The films are flexible 832 and stretchable at room temperature and humidity of 50%. T","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76224197","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}
Pub Date : 2021-05-24DOI: 10.34257/GJREEVOL21IS2PG35
A. Salau, O. Sadiq
This research is based on the study of the deflection response of a structural circular sandwich plate, simply supported or clamped at its boundary, under different loading configurations (uniformly distributed, concentrated, and linearly varying load). The non-linear governing differential equation of the plate was solved using an Analytical method, Variational Iteration Method (VIM), after which the Finite Element Method (FEM) was used to validate its accuracy. Results showed a significantly higher deflection value for the simply supported plate compared to the clamped plate for all the various loading configurations, where a sandwich plate of radius 100mm under clamped conditions generated deflection of 0.05mm when exposed to a uniform load while a deflection of 0.25mm for simply supported condition. The concentrated load was also discovered to have a major effect on the body of the sandwich plate as it was seen to generate the highest deflection among all loading configurations regardless of its boundary conditions where a simply supported condition with a point load had a high deflection amounting to 2.1mm.
{"title":"Deflection Response of Structural Circular Sandwich Plates Subject to Uniform, Concentrated and Linearly Varying Load","authors":"A. Salau, O. Sadiq","doi":"10.34257/GJREEVOL21IS2PG35","DOIUrl":"https://doi.org/10.34257/GJREEVOL21IS2PG35","url":null,"abstract":"This research is based on the study of the deflection response of a structural circular sandwich plate, simply supported or clamped at its boundary, under different loading configurations (uniformly distributed, concentrated, and linearly varying load). The non-linear governing differential equation of the plate was solved using an Analytical method, Variational Iteration Method (VIM), after which the Finite Element Method (FEM) was used to validate its accuracy. Results showed a significantly higher deflection value for the simply supported plate compared to the clamped plate for all the various loading configurations, where a sandwich plate of radius 100mm under clamped conditions generated deflection of 0.05mm when exposed to a uniform load while a deflection of 0.25mm for simply supported condition. The concentrated load was also discovered to have a major effect on the body of the sandwich plate as it was seen to generate the highest deflection among all loading configurations regardless of its boundary conditions where a simply supported condition with a point load had a high deflection amounting to 2.1mm.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"8 1","pages":"35-45"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75269664","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}
Pub Date : 2021-02-11DOI: 10.34257/GJREEVOL21IS1PG25
Ranjeet Joshi, S. S. Bhadauria, S. Kushwah
This study analyzes and model zone-wise earthquakes inter-event recurrence interval (IRIs) using a stochastic Weibull probabilistic distribution model. The study region between 19–28◦N and 72–84◦E up to 200 km peripheral boundaries of Central India (Madhya Pradesh) is divided into four zones (Zone South, West, North, and East), respectively, based on different clusters of earthquakes with shared seismo-tectonic regimes. Seismic events’ catalog from different national and international resources for a period of more than 100 years are considered in this study. The seismic data is grouped into two categories based on a different range of earthquake magnitudes (3≤Mw< 4 & 4 ≤ M w ≤ 6). Zonewise results are produced in the form of hazard curves and conditional probabilities of occurrence for a range of elapsed time from 3 to 30 years from last recorded earthquakes in various zones.
{"title":"Modelling Earthquake’s Inter-event Recurrence Intervals (IRIs) in Central India and Adjoining Regions using Weibull Probability Distribution Model – A Zone-Wise Approach","authors":"Ranjeet Joshi, S. S. Bhadauria, S. Kushwah","doi":"10.34257/GJREEVOL21IS1PG25","DOIUrl":"https://doi.org/10.34257/GJREEVOL21IS1PG25","url":null,"abstract":"This study analyzes and model zone-wise earthquakes inter-event recurrence interval (IRIs) using a stochastic Weibull probabilistic distribution model. The study region between 19–28◦N and 72–84◦E up to 200 km peripheral boundaries of Central India (Madhya Pradesh) is divided into four zones (Zone South, West, North, and East), respectively, based on different clusters of earthquakes with shared seismo-tectonic regimes. Seismic events’ catalog from different national and international resources for a period of more than 100 years are considered in this study. The seismic data is grouped into two categories based on a different range of earthquake magnitudes (3≤Mw< 4 & 4 ≤ M w ≤ 6). Zonewise results are produced in the form of hazard curves and conditional probabilities of occurrence for a range of elapsed time from 3 to 30 years from last recorded earthquakes in various zones.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"20 1","pages":"25-48"},"PeriodicalIF":0.0,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85757526","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}
Pub Date : 2021-01-20DOI: 10.34257/GJREJVOL21IS1PG1
R. Siminiuc, D. Țurcanu
The assortment of gluten-free flours in the Republic of Moldova is very small, and the properties of these flours are not sufficiently studied. Sorghum (Sorghum Oryzoidum) is a relatively new cereal, the industrial production of which has recently begun, and the use of sorghum and derivatives, especially flour, are current. The purpose of this study is to determine the chemical composition and nutritional value of sorghum flour. This would have a direct impact on human well-being, contribute to the development of novel foods and reduce food insecurity in the Republic of Moldova, including people with gluten-related disorders. Physico-chemical methods were used to determine the chemical composition and nutritional aspects of the flour. The obtained results showed that the chemical composition of soriz flour is complex and similar to cereal flours, with a predominance of carbohydrates, followed by proteins, lipids etc.
{"title":"Physico-Chemical and Nutritional Characteristics of Soriz Flour (Sorghum Oryzoidum)","authors":"R. Siminiuc, D. Țurcanu","doi":"10.34257/GJREJVOL21IS1PG1","DOIUrl":"https://doi.org/10.34257/GJREJVOL21IS1PG1","url":null,"abstract":"The assortment of gluten-free flours in the Republic of Moldova is very small, and the properties of these flours are not sufficiently studied. Sorghum (Sorghum Oryzoidum) is a relatively new cereal, the industrial production of which has recently begun, and the use of sorghum and derivatives, especially flour, are current. The purpose of this study is to determine the chemical composition and nutritional value of sorghum flour. This would have a direct impact on human well-being, contribute to the development of novel foods and reduce food insecurity in the Republic of Moldova, including people with gluten-related disorders. Physico-chemical methods were used to determine the chemical composition and nutritional aspects of the flour. The obtained results showed that the chemical composition of soriz flour is complex and similar to cereal flours, with a predominance of carbohydrates, followed by proteins, lipids etc.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"32 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2021-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76710094","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}
Pub Date : 2020-10-19DOI: 10.34257/gjrefvol20is4pg11
Daniel L. Stevens
Low probability of intercept radar signals, which are often problematic to detect and characterize, have as their goal ‘to see and not be seen’. Digital intercept receivers are currently moving away from Fourier-based analysis and towards classical time-frequency analysis techniques for the purpose of analyzing these low probability of intercept radar signals. Although these classical time-frequency analysis techniques are an improvement over existing Fourierbased techniques, they still suffer from a lack of readability –which can be caused by poor timefrequency localization (such as the spectrogram), which may in turn lead to inaccurate detection and parameter extraction. In this study, the reassignment method, because of its ability to improve time-frequency localization, is proposed as an improved signal analysis technique to address the poor time-frequency localization deficiency of the spectrogram. This paper presents the novel approach of characterizing low probability of intercept frequency hopping radar signals through utilization and direct comparison of the spectrogram versus the reassigned
{"title":"Detection and Parameter Extraction of Low Probability of Intercept Frequency Hopping Signals using the Spectrogram and the Reassigned Spectrogram","authors":"Daniel L. Stevens","doi":"10.34257/gjrefvol20is4pg11","DOIUrl":"https://doi.org/10.34257/gjrefvol20is4pg11","url":null,"abstract":"Low probability of intercept radar signals, which are often problematic to detect and characterize, have as their goal ‘to see and not be seen’. Digital intercept receivers are currently moving away from Fourier-based analysis and towards classical time-frequency analysis techniques for the purpose of analyzing these low probability of intercept radar signals. Although these classical time-frequency analysis techniques are an improvement over existing Fourierbased techniques, they still suffer from a lack of readability –which can be caused by poor timefrequency localization (such as the spectrogram), which may in turn lead to inaccurate detection and parameter extraction. In this study, the reassignment method, because of its ability to improve time-frequency localization, is proposed as an improved signal analysis technique to address the poor time-frequency localization deficiency of the spectrogram. This paper presents the novel approach of characterizing low probability of intercept frequency hopping radar signals through utilization and direct comparison of the spectrogram versus the reassigned","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"10 1","pages":"11-20"},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72643489","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}
Pub Date : 2020-09-25DOI: 10.34257/GJREEVOL20IS3PG33
Naito Nobuyuki, Park Kyeonghoon, Mazda Taiji, Uno Hiroshige, Kawakami Masahide
The characteristics of the seismic bearing change depending on various factors. When an earthquake occurs, the behavior of the bridge may differ from the values expected in the structural design. The shear deformation of the seismic bearing may increase, but it is difficult to reach the fracture deformation. This paper studied the effect of the stiffness due to various dependency and durability on Lead Rubber Bearings (LRB) and the over strength of bridge piers on the bearing behavior when an earthquake occurred. As a result, if the stiffness of LRB reduces within the criteria, seismic performance can be expected safety even if the shear strain designed in the current design is greater than the allowable shear strain. The reason is that the hardening phenomenon in the high strain region of the laminated rubber bearing suppresses the displacement. Also, since the seismic bridges with over strength of the piers have come near elastic behavior when an earthquake occurs, shear strain is easy to
{"title":"Evaluation of Seismic Performance Focusing on Increasing Response of Lead Rubber Bearing (LRB) and Over Strength of RC Pier During Earthquake","authors":"Naito Nobuyuki, Park Kyeonghoon, Mazda Taiji, Uno Hiroshige, Kawakami Masahide","doi":"10.34257/GJREEVOL20IS3PG33","DOIUrl":"https://doi.org/10.34257/GJREEVOL20IS3PG33","url":null,"abstract":"The characteristics of the seismic bearing change depending on various factors. When an earthquake occurs, the behavior of the bridge may differ from the values expected in the structural design. The shear deformation of the seismic bearing may increase, but it is difficult to reach the fracture deformation. This paper studied the effect of the stiffness due to various dependency and durability on Lead Rubber Bearings (LRB) and the over strength of bridge piers on the bearing behavior when an earthquake occurred. As a result, if the stiffness of LRB reduces within the criteria, seismic performance can be expected safety even if the shear strain designed in the current design is greater than the allowable shear strain. The reason is that the hardening phenomenon in the high strain region of the laminated rubber bearing suppresses the displacement. Also, since the seismic bridges with over strength of the piers have come near elastic behavior when an earthquake occurs, shear strain is easy to","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"1 1","pages":"33-50"},"PeriodicalIF":0.0,"publicationDate":"2020-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91354869","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}
Pub Date : 2020-09-24DOI: 10.34257/GJREAVOL20IS2PG35
Ngnassi Djami Aslain Brisco, Nzié Wolfgang, D. Serge
To define the reliability network of a system (machine), we start with a set of components arranged in an appropriate topology (series, parallel, or parallel-series), choose the best terms of the ratio performance / cost, and gather by links with the aim to combine them. This process requires a long time and effort, given the very large number of possible combinations, which becomes tedious for the analyst. For this reason, it is essential to use an appropriate optimization approach when designing any product. However, before trying to optimize, it is necessary to have a reliability assessment method. The objective of this paper is to display a meta-heuristic method, which is sustained on the genetic algorithm (GA) to improve the machines reliability. To achieve this objective, a methodology that consists of presenting the functionalities of genetic algorithms is developed. The result achieved is the proposal of a reliability network for the optimal solution.
{"title":"Machine Reliability Optimization by Genetic Algorithm Approach","authors":"Ngnassi Djami Aslain Brisco, Nzié Wolfgang, D. Serge","doi":"10.34257/GJREAVOL20IS2PG35","DOIUrl":"https://doi.org/10.34257/GJREAVOL20IS2PG35","url":null,"abstract":"To define the reliability network of a system (machine), we start with a set of components arranged in an appropriate topology (series, parallel, or parallel-series), choose the best terms of the ratio performance / cost, and gather by links with the aim to combine them. This process requires a long time and effort, given the very large number of possible combinations, which becomes tedious for the analyst. For this reason, it is essential to use an appropriate optimization approach when designing any product. However, before trying to optimize, it is necessary to have a reliability assessment method. The objective of this paper is to display a meta-heuristic method, which is sustained on the genetic algorithm (GA) to improve the machines reliability. To achieve this objective, a methodology that consists of presenting the functionalities of genetic algorithms is developed. The result achieved is the proposal of a reliability network for the optimal solution.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"116 1","pages":"35-40"},"PeriodicalIF":0.0,"publicationDate":"2020-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77696765","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}
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