Pub Date : 2020-09-22DOI: 10.34257/GJREBVOL20IS1PG1
G. Filomeno, Stefano Feraco
In the last few years, the automotive industry has been moving towards fuel-free and economically sustainable alternatives, motivated by the latest trends in the market and new regulations about CO2 emissions. Hybrid and electric vehicles feature a transmission drive with one or more electrical motors powered by Lithium batteries. Thus, Lithium batteries are increasingly used in onboard energy storage systems, leading new economical, technical and environmental challenges which are of fundamental importance in this early stage for the next automotive generation. Recycling materials from used Lithium batteries can also moderate the price of virgin materials, by reducing the price disposal as well as the dependence of manufacturers on exporting countries. Furthermore, recycling Lithium-ion batteries has significant environmental benefits, such as containing the risk of chemical pollution and improving safety in storage facilities for exhausted batteries worldwide. This paper aims to provide a comprehensive insight on Lithium-ion battery recycling for scientific research and industrial applications, examining the economic, technical and environmental aspects of this topic.
{"title":"Economic, Technical and Environmental Aspects of Recycling Lithium Batteries: A Literature Review","authors":"G. Filomeno, Stefano Feraco","doi":"10.34257/GJREBVOL20IS1PG1","DOIUrl":"https://doi.org/10.34257/GJREBVOL20IS1PG1","url":null,"abstract":"In the last few years, the automotive industry has been moving towards fuel-free and economically sustainable alternatives, motivated by the latest trends in the market and new regulations about CO2 emissions. Hybrid and electric vehicles feature a transmission drive with one or more electrical motors powered by Lithium batteries. Thus, Lithium batteries are increasingly used in onboard energy storage systems, leading new economical, technical and environmental challenges which are of fundamental importance in this early stage for the next automotive generation. Recycling materials from used Lithium batteries can also moderate the price of virgin materials, by reducing the price disposal as well as the dependence of manufacturers on exporting countries. Furthermore, recycling Lithium-ion batteries has significant environmental benefits, such as containing the risk of chemical pollution and improving safety in storage facilities for exhausted batteries worldwide. This paper aims to provide a comprehensive insight on Lithium-ion battery recycling for scientific research and industrial applications, examining the economic, technical and environmental aspects of this topic.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"21 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72887208","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 : 2020-08-27DOI: 10.34257/gjredvol20is1pg1
B. S. Gill
The compressible flow analysis is traditionally done by referring to tables where various ratios are listed for various values of Mach number M. Here a different approach is presented which does not require any reference to any tables and the problems can be solved much more comprehensibly and which gives more accurate values.
{"title":"Compressible Flow Analysis through Spreadsheet","authors":"B. S. Gill","doi":"10.34257/gjredvol20is1pg1","DOIUrl":"https://doi.org/10.34257/gjredvol20is1pg1","url":null,"abstract":"The compressible flow analysis is traditionally done by referring to tables where various ratios are listed for various values of Mach number M. Here a different approach is presented which does not require any reference to any tables and the problems can be solved much more comprehensibly and which gives more accurate values.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"71 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85161118","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 : 2020-08-11DOI: 10.34257/gjreevol20is2pg25
H. Tosun
Safety evaluation is a fundamental stage of existing dams and their appurtenant structures, which have a high-risk potential for downstream life and property. Turkey is a country, which seismically settled at one of the most active regions in the world, and earthquakes with high magnitude frequently occur here. There are some regions, which are severely under threatening of earthquakes. One of them is the Marmara region with twenty-four million people. This region, namely the Marmara basin, has at least forty-five large dams with different types. This study considered nineteen of them to relieve their seismic hazard parameters for all dam sites and total risk for each structure. The study area is lying in a seismically, very active part of Turkey. The southern part of the basin is structurally cut by the North Anatolian Fault, which is a famous structural feature that produces deathful earthquakes, and its offshoots. The analyses have indicated that peak acceleration widely ranges for the nineteen dam sites of this basin. The total risk analyses have concluded that most of the dams in the metropolitan area have high-risk classes and a significant effect for public safety.
{"title":"Seismic Hazard and Total Risk of Existing Large Dams in the Marmara Basin, Turkey","authors":"H. Tosun","doi":"10.34257/gjreevol20is2pg25","DOIUrl":"https://doi.org/10.34257/gjreevol20is2pg25","url":null,"abstract":"Safety evaluation is a fundamental stage of existing dams and their appurtenant structures, which have a high-risk potential for downstream life and property. Turkey is a country, which seismically settled at one of the most active regions in the world, and earthquakes with high magnitude frequently occur here. There are some regions, which are severely under threatening of earthquakes. One of them is the Marmara region with twenty-four million people. This region, namely the Marmara basin, has at least forty-five large dams with different types. This study considered nineteen of them to relieve their seismic hazard parameters for all dam sites and total risk for each structure. The study area is lying in a seismically, very active part of Turkey. The southern part of the basin is structurally cut by the North Anatolian Fault, which is a famous structural feature that produces deathful earthquakes, and its offshoots. The analyses have indicated that peak acceleration widely ranges for the nineteen dam sites of this basin. The total risk analyses have concluded that most of the dams in the metropolitan area have high-risk classes and a significant effect for public safety.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"25 1","pages":"25-36"},"PeriodicalIF":0.0,"publicationDate":"2020-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87546773","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 : 2020-06-03DOI: 10.34257/gjrejvol20is3pg23
G. Libotte, F. Lobato, G. Platt, F. D. M. Neto
The determination of optimal feeding profile of fedbatch fermentation requires the solution of a singular optimal control problem. The complexity in obtaining the solution to this singular problem is due to the nonlinear dynamics of the system model, the presence of control variables in linear form and the existence of constraints in both the state and control variables. Traditionally, during the optimization process, uncertainties associated with design variables, control parameters and mathematical model are not considered. In this contribution, a systematic methodology to evaluate uncertainties during the resolution of a singular optimal control problem is proposed. This approach consists of the Multiobjective Optimization Differential Evolution algorithm associated with Effective Mean Concept. The proposed methodology is applied to determine the feed substrate concentration in fed-batch penicillin fermentation process. The robust multiobjective singular optimal control problem consists of maximizing the productivity and minimizing the operation total time. The overall profit is considered as a postprocessing criterion in the choice and implementation of a result contained in the Pareto set. The results obtained indicate that the proposed methodology represents an interesting approach to solve this kind of problem.
{"title":"Robust Multi-Objective Singular Optimal Control Ofpenicillin Fermentation Process","authors":"G. Libotte, F. Lobato, G. Platt, F. D. M. Neto","doi":"10.34257/gjrejvol20is3pg23","DOIUrl":"https://doi.org/10.34257/gjrejvol20is3pg23","url":null,"abstract":"The determination of optimal feeding profile of fedbatch fermentation requires the solution of a singular optimal control problem. The complexity in obtaining the solution to this singular problem is due to the nonlinear dynamics of the system model, the presence of control variables in linear form and the existence of constraints in both the state and control variables. Traditionally, during the optimization process, uncertainties associated with design variables, control parameters and mathematical model are not considered. In this contribution, a systematic methodology to evaluate uncertainties during the resolution of a singular optimal control problem is proposed. This approach consists of the Multiobjective Optimization Differential Evolution algorithm associated with Effective Mean Concept. The proposed methodology is applied to determine the feed substrate concentration in fed-batch penicillin fermentation process. The robust multiobjective singular optimal control problem consists of maximizing the productivity and minimizing the operation total time. The overall profit is considered as a postprocessing criterion in the choice and implementation of a result contained in the Pareto set. The results obtained indicate that the proposed methodology represents an interesting approach to solve this kind of problem.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"24 1","pages":"23-30"},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91008237","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 : 2020-05-09DOI: 10.34257/gjrefvol20is2pg7
C. K. Amuzuvi, H. Warden
This paper proposes a generalised feed-forward artificial neural network model that fulfils the failure prediction of a three phase 5.8MW, 11 kV Slip-Ring SAG Mill Induction Motor at Goldfields Ghana Limited, Damang Mine. It provides a general understanding of three phase induction motors, faults associated with induction motors and also emphasizes the use of intelligent systems, particularly artificial neural network, a modern failure prediction technology of induction motors. Site analysis and motor data (Current, Power and Winding Temperatures) collection were conducted at the Damang Mine. Simulation results are presented using MATLAB software (2017a) package to develop the fault prediction model. The proposed feed-forward neural network used the Levenberg-Marquardt and Bayesian Regularisation in training.
{"title":"Failure Prediction of Induction Motors: A Case Study using CSLGH900/6-214, 5.8 MW, 11 kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine","authors":"C. K. Amuzuvi, H. Warden","doi":"10.34257/gjrefvol20is2pg7","DOIUrl":"https://doi.org/10.34257/gjrefvol20is2pg7","url":null,"abstract":"This paper proposes a generalised feed-forward artificial neural network model that fulfils the failure prediction of a three phase 5.8MW, 11 kV Slip-Ring SAG Mill Induction Motor at Goldfields Ghana Limited, Damang Mine. It provides a general understanding of three phase induction motors, faults associated with induction motors and also emphasizes the use of intelligent systems, particularly artificial neural network, a modern failure prediction technology of induction motors. Site analysis and motor data (Current, Power and Winding Temperatures) collection were conducted at the Damang Mine. Simulation results are presented using MATLAB software (2017a) package to develop the fault prediction model. The proposed feed-forward neural network used the Levenberg-Marquardt and Bayesian Regularisation in training.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"371 1","pages":"7-28"},"PeriodicalIF":0.0,"publicationDate":"2020-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85478702","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 : 2020-05-04DOI: 10.34257/gjrefvol20is2pg1
D. Stevanović
In this paper, Weibull and Poisson distribution conclusion are they suitable for circuit breakers remaining useful life assessment (RUL). Old data are covering a 10 years period consisting of measured voltage drop on CB contacts and number of tripped short circuit faults. In this paper, new data, from the last 3 years, would be used to make a comparison with old data and make conclusions have been probability distributions correctly chosen.
{"title":"Analysis of Weibull and Poisson Distribution use in Medium Voltage Circuit Breakers RUL Assessment","authors":"D. Stevanović","doi":"10.34257/gjrefvol20is2pg1","DOIUrl":"https://doi.org/10.34257/gjrefvol20is2pg1","url":null,"abstract":"In this paper, Weibull and Poisson distribution conclusion are they suitable for circuit breakers remaining useful life assessment (RUL). Old data are covering a 10 years period consisting of measured voltage drop on CB contacts and number of tripped short circuit faults. In this paper, new data, from the last 3 years, would be used to make a comparison with old data and make conclusions have been probability distributions correctly chosen.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"3 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73035043","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 : 2020-01-18DOI: 10.34257/gjreavol19is4pg69
I. Ahmed, H. Joni, Hridita Nowrin Pranti
The nuclear power plant is required to supply a substantial amount of electricity for a densely populated country like Bangladesh. The government of Bangladesh has attached to a commitment to implement the Rooppur Nuclear Power Plant, and so Bangladesh will be the 33 nuclear powerproducing country after the successful construction of this plant. Bangladesh has planned to construct two power units (Rooppur-1 & Rooppur-2) with a capacity of 1200 MW, each of and is expected to go into operation in 2023. Russian Rosatom State Atomic Energy Corporation is constructing this nuclear power plant, which is the generation-3+ VVER-1200 model. But the main concern is how a third world country like Bangladesh can handle the tons of radioactive waste of RNNP. Radioactive waste i.e., a variety of solids, liquids, and gases which are produced during the generation of nuclear energy in a nuclear reactor. Depending on activity content, solid and liquid waste are disposed of in near-surface or deep geological facilities, and gaseous waste is dissolved by following some filtering process. If not properly disposed of or recycled, irradiation from radioactive waste will cause major problems for the environment. Various stages should be required for the removal of a tremendous amount of radioactive waste in a costeffective way. This paper mainly delineates the proximate of radioactive waste management of RNNP and gives an account of (1) Radioactivity and radiation level, (2) Classification, (3) Treatment of solid, liquid and gaseous radioactive waste, (4) Reprocessing and packaging, (5) Storage and (6) Disposal.
{"title":"Study of Radioactive Waste Management of Nuclear Power Plant: Prospect of Rooppur Nuclear Power Plant","authors":"I. Ahmed, H. Joni, Hridita Nowrin Pranti","doi":"10.34257/gjreavol19is4pg69","DOIUrl":"https://doi.org/10.34257/gjreavol19is4pg69","url":null,"abstract":"The nuclear power plant is required to supply a substantial amount of electricity for a densely populated country like Bangladesh. The government of Bangladesh has attached to a commitment to implement the Rooppur Nuclear Power Plant, and so Bangladesh will be the 33 nuclear powerproducing country after the successful construction of this plant. Bangladesh has planned to construct two power units (Rooppur-1 & Rooppur-2) with a capacity of 1200 MW, each of and is expected to go into operation in 2023. Russian Rosatom State Atomic Energy Corporation is constructing this nuclear power plant, which is the generation-3+ VVER-1200 model. But the main concern is how a third world country like Bangladesh can handle the tons of radioactive waste of RNNP. Radioactive waste i.e., a variety of solids, liquids, and gases which are produced during the generation of nuclear energy in a nuclear reactor. Depending on activity content, solid and liquid waste are disposed of in near-surface or deep geological facilities, and gaseous waste is dissolved by following some filtering process. If not properly disposed of or recycled, irradiation from radioactive waste will cause major problems for the environment. Various stages should be required for the removal of a tremendous amount of radioactive waste in a costeffective way. This paper mainly delineates the proximate of radioactive waste management of RNNP and gives an account of (1) Radioactivity and radiation level, (2) Classification, (3) Treatment of solid, liquid and gaseous radioactive waste, (4) Reprocessing and packaging, (5) Storage and (6) Disposal.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"23 1","pages":"69-79"},"PeriodicalIF":0.0,"publicationDate":"2020-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89946097","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 : 2019-12-20DOI: 10.34257/gjreavol19is4pg51
Vitor Guilherme de Oliveira, Luís Leonardo Horne Curimbaba Ferreira, Marcos Antônio dos Reis, P. M. Nakachima, A. L. Pereira
Refractories have been very important for humankind development enabling the manufacturing of a wide range of materials. Primary industries demanding refractories include the manufacturing of steel, non-ferrous metals, glass, lime, cement, ceramics, petrochemicals and incineration. Refractory grade bauxites (RGBs) are high-alumina materials used as aggregates in shaped and unshaped refractory linings suitable to withstand high temperature heating and a corrosive environment. Despite the wide availability of bauxite ores in the world, few countries can supply a bauxite with refractory grades. Guyana, China and Brazil have emerged as suppliers for the refractory industry and the peculiarities of each bauxite from these countries impact directly on the refractory and how the manufacturing process can impact the refractory properties. The Guyanese RGB presented the highest alumina content (~90% Al2O3). However, a Brazilian RGB with lower alumina content (~85% Al2O3) presented the highest hot modulus of rupture value (HMoR at 1200°C/5h = 5.12 MPa). As for the Chinese RGBs, these presented a higher heterogeneity, evidenced in variation on chemical composition resulting in worse thermo mechanical performance (HMoR< 4.10 MPa). Two different forming process for Brazilian RGBs showed that the briquetting operation produces angularshaped grains (sphericity = 0.7), whereas the extrusion mechanism produces rounded grains (sphericity = 0.9) which
{"title":"Refractory Grade Bauxite: An Overview about the Effects of different Bauxite Sources and Forming Processes on the Quality of the Material","authors":"Vitor Guilherme de Oliveira, Luís Leonardo Horne Curimbaba Ferreira, Marcos Antônio dos Reis, P. M. Nakachima, A. L. Pereira","doi":"10.34257/gjreavol19is4pg51","DOIUrl":"https://doi.org/10.34257/gjreavol19is4pg51","url":null,"abstract":"Refractories have been very important for humankind development enabling the manufacturing of a wide range of materials. Primary industries demanding refractories include the manufacturing of steel, non-ferrous metals, glass, lime, cement, ceramics, petrochemicals and incineration. Refractory grade bauxites (RGBs) are high-alumina materials used as aggregates in shaped and unshaped refractory linings suitable to withstand high temperature heating and a corrosive environment. Despite the wide availability of bauxite ores in the world, few countries can supply a bauxite with refractory grades. Guyana, China and Brazil have emerged as suppliers for the refractory industry and the peculiarities of each bauxite from these countries impact directly on the refractory and how the manufacturing process can impact the refractory properties. The Guyanese RGB presented the highest alumina content (~90% Al2O3). However, a Brazilian RGB with lower alumina content (~85% Al2O3) presented the highest hot modulus of rupture value (HMoR at 1200°C/5h = 5.12 MPa). As for the Chinese RGBs, these presented a higher heterogeneity, evidenced in variation on chemical composition resulting in worse thermo mechanical performance (HMoR< 4.10 MPa). Two different forming process for Brazilian RGBs showed that the briquetting operation produces angularshaped grains (sphericity = 0.7), whereas the extrusion mechanism produces rounded grains (sphericity = 0.9) which","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"12 1","pages":"51-67"},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79852072","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}
Highly crystalline surface supported metal organic framework thin film has been used to generate enhanced photocurrent in the photoelectrochemical cells. The combination of Zn-perylene SURMOF and pyridine functionalized Bodipy has ~ two times higher photocurrent due to triplet triplet annihilation upconversion than its own parts. This experimentally determined data shows that MOF thin film material is well suited for overcoming the energy loss due to Shockley-Queisser limit for dye sensitized solar cell technology.
{"title":"The Exploration of Enhanced Photocurrent with Zn-Perylene Metal Organic Frameworks Thin Film and Bodipy via Triplet Triplet Annihilation Upconversion","authors":"S. Ahmad, Jinxuan Liu, Licheng Sun","doi":"10.15761/RRI.1000147","DOIUrl":"https://doi.org/10.15761/RRI.1000147","url":null,"abstract":"Highly crystalline surface supported metal organic framework thin film has been used to generate enhanced photocurrent in the photoelectrochemical cells. The combination of Zn-perylene SURMOF and pyridine functionalized Bodipy has ~ two times higher photocurrent due to triplet triplet annihilation upconversion than its own parts. This experimentally determined data shows that MOF thin film material is well suited for overcoming the energy loss due to Shockley-Queisser limit for dye sensitized solar cell technology.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81899471","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 : 2018-10-05DOI: 10.34257/gjrefvol18is4pg1
Daniel L. Stevens, S. Schuckers
The reassignment method is a non-linear, postprocessing technique which cans improve the localization of a time-frequency distribution by moving its values according to a suitable vector field. The reassignment method’s scheme assumes that the energy distribution in the time-frequency plane resembles a mass distribution and moves each value of the time-frequency plane located at a point (tt,ff)to another point,(tt�,ff�), which is the center of gravity of the energy distribution in the area of (tt,ff). The result is a focused representation with very high intensity [11].Duringthis research it was investigated and determined that the frequency reassignment corrections derived from the Flandrin reassignment method have undesired noise sensitivity at very small noise levels as well as undesired observed distortions. In order to address these issues, a novel approach was derived the discrete-time, discrete-frequency formulation of frequency reassignment. It is shown that in noise-free tone scenarios, this novel approach eliminates ambiguity and provides less distortion than the Flandrin reassignment method.
{"title":"Discrete-Time, Discrete-Frequency Reassignment Method","authors":"Daniel L. Stevens, S. Schuckers","doi":"10.34257/gjrefvol18is4pg1","DOIUrl":"https://doi.org/10.34257/gjrefvol18is4pg1","url":null,"abstract":"The reassignment method is a non-linear, postprocessing technique which cans improve the localization of a time-frequency distribution by moving its values according to a suitable vector field. The reassignment method’s scheme assumes that the energy distribution in the time-frequency plane resembles a mass distribution and moves each value of the time-frequency plane located at a point (tt,ff)to another point,(tt�,ff�), which is the center of gravity of the energy distribution in the area of (tt,ff). The result is a focused representation with very high intensity [11].Duringthis research it was investigated and determined that the frequency reassignment corrections derived from the Flandrin reassignment method have undesired noise sensitivity at very small noise levels as well as undesired observed distortions. In order to address these issues, a novel approach was derived the discrete-time, discrete-frequency formulation of frequency reassignment. It is shown that in noise-free tone scenarios, this novel approach eliminates ambiguity and provides less distortion than the Flandrin reassignment method.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84862301","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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