Pub Date : 2020-06-30DOI: 10.25073/jaec.202042.279
K. Takizawa, Y. Bazilevs, T. Tezduyar, A. Korobenko
With the recent advances in the variational multiscale (VMS) methods, computational ow analysis in aerospace, energy, and transportation technologies has reached a high level of sophistication. It is bringing solutions in challenging problems such as the aerodynamics of parachutes, thermo-fluid analysis of ground vehicles and tires, and fluid-structure interaction (FSI) analysis of wind turbines. The computational challenges include complex geometries, moving boundaries and interfaces, FSI, turbulent flows, rotational flows, and large problem sizes. The Residual-Based VMS (RBVMS), Arbitrary Lagrangian-Eulerian VMS (ALE-VMS) and Space-Time VMS (ST-VMS) methods have been successfully serving as core methods in addressing the computational challenges. The core methods are supplemented with special methods targeting specific classes of problems, such as the Slip Interface (SI) method, MultiDomain Method, and the ST-C data compression method. We provide and overview of the core and special methods. We present, as examples of challenging computations performed with these methods, aerodynamic analysis of a ramair parachute, thermo-fluid analysis of a freight truck and its rear set of tires, and aerodynamic and FSI analysis of two back-to-back wind turbines in atmospheric boundary layer flow. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Computational Flow Analysis in Aerospace, Energy and Transportation Technologies with the Variational Multiscale Methods","authors":"K. Takizawa, Y. Bazilevs, T. Tezduyar, A. Korobenko","doi":"10.25073/jaec.202042.279","DOIUrl":"https://doi.org/10.25073/jaec.202042.279","url":null,"abstract":"With the recent advances in the variational multiscale (VMS) methods, computational ow analysis in aerospace, energy, and transportation technologies has reached a high level of sophistication. It is bringing solutions in challenging problems such as the aerodynamics of parachutes, thermo-fluid analysis of ground vehicles and tires, and fluid-structure interaction (FSI) analysis of wind turbines. The computational challenges include complex geometries, moving boundaries and interfaces, FSI, turbulent flows, rotational flows, and large problem sizes. The Residual-Based VMS (RBVMS), Arbitrary Lagrangian-Eulerian VMS (ALE-VMS) and Space-Time VMS (ST-VMS) methods have been successfully serving as core methods in addressing the computational challenges. The core methods are supplemented with special methods targeting specific classes of problems, such as the Slip Interface (SI) method, MultiDomain Method, and the ST-C data compression method. We provide and overview of the core and special methods. We present, as examples of challenging computations performed with these methods, aerodynamic analysis of a ramair parachute, thermo-fluid analysis of a freight truck and its rear set of tires, and aerodynamic and FSI analysis of two back-to-back wind turbines in atmospheric boundary layer flow. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131757897","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 : 2020-06-30DOI: 10.25073/jaec.202042.283
D. O’Regan, N. Hoa
In this paper, the existence of extremal solutions of Caputo-Hadamard-type fractional di erential equations (CHFDEs) with order α ∈ (1, 2) is established by employing the method of lower and upper solutions. Moreover, su cient condition that ensure the stability of a class of CHFDE is also provided. Some examples are given to illustrate our main results.
{"title":"An Initial Value Problem Involving Caputo-Hadamard Fractional Derivative: The Extremal Solutions and Stabilization","authors":"D. O’Regan, N. Hoa","doi":"10.25073/jaec.202042.283","DOIUrl":"https://doi.org/10.25073/jaec.202042.283","url":null,"abstract":"In this paper, the existence of extremal solutions of Caputo-Hadamard-type fractional di erential equations (CHFDEs) with order α ∈ (1, 2) is established by employing the method of lower and upper solutions. Moreover, su cient condition that ensure the stability of a class of CHFDE is also provided. Some examples are given to illustrate our main results.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134095109","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 : 2020-03-31DOI: 10.25073/jaec.202041.255
Min-Feng Lai, Hsiao-Yi Lee, Doan Quoc Anh Nguyen
This study proposed a triple-layer remote phosphor (TRP) structure to improve the color and luminous ux of white LEDs (WLEDs). TRP structure consists of 3 di erent phosphor layers: yellow YAG:Ce layer below, red CaMgSi2O6:Eu ,Mn phosphor on top and green layer Ba2Li2Si2O7:Sn ,Mn phosphor in the middle. Using red CaMgSi2O6:Eu ,Mn to control the red light component leads to the increase in color rendering index (CRI). Utilizing the green CaMgSi2O6:Eu ,Mn phosphor to control the green light component results in the increase in luminous e cacy (LE) of WLEDs. Furthermore, when the concentration of these two phosphors increased, yellow layer YAG:Ce concentration decreased to maintain average correlated color temperatures (ACCTs) in the range from 6000K to 8500K. Besides CRI and LE, color quality scale (CQS) is also analyzed through the control of green and red phosphors concentrations. The research results show that the higher the concentration of CaMgSi2O6:Eu ,Mn is, the better the CRI becomes. In contrast, CRI decreased signi cantly when increasing the concentration of Ba2Li2Si2O7:Sn ,Mn . Meanwhile, CQS achieved notable enhancement in the concentration range of 10% -14% CaMgSi2O6:Eu ,Mn, regardless of Ba2Li2Si2O7:Sn ,Mn concentration. LE, in particular, can also increase by more than 40% along with the improvement of CRI and CQS due to the reduction of the backscattered light and the addition of green light. Research results are a valuable reference for producers who wish to improve the color quality and enhance the luminous ux of WLEDs.
{"title":"Exellent Color Quality and Luminous Flux of Wleds Using Triple-Layer Remote Phosphor Configuration","authors":"Min-Feng Lai, Hsiao-Yi Lee, Doan Quoc Anh Nguyen","doi":"10.25073/jaec.202041.255","DOIUrl":"https://doi.org/10.25073/jaec.202041.255","url":null,"abstract":"This study proposed a triple-layer remote phosphor (TRP) structure to improve the color and luminous ux of white LEDs (WLEDs). TRP structure consists of 3 di erent phosphor layers: yellow YAG:Ce layer below, red CaMgSi2O6:Eu ,Mn phosphor on top and green layer Ba2Li2Si2O7:Sn ,Mn phosphor in the middle. Using red CaMgSi2O6:Eu ,Mn to control the red light component leads to the increase in color rendering index (CRI). Utilizing the green CaMgSi2O6:Eu ,Mn phosphor to control the green light component results in the increase in luminous e cacy (LE) of WLEDs. Furthermore, when the concentration of these two phosphors increased, yellow layer YAG:Ce concentration decreased to maintain average correlated color temperatures (ACCTs) in the range from 6000K to 8500K. Besides CRI and LE, color quality scale (CQS) is also analyzed through the control of green and red phosphors concentrations. The research results show that the higher the concentration of CaMgSi2O6:Eu ,Mn is, the better the CRI becomes. In contrast, CRI decreased signi cantly when increasing the concentration of Ba2Li2Si2O7:Sn ,Mn . Meanwhile, CQS achieved notable enhancement in the concentration range of 10% -14% CaMgSi2O6:Eu ,Mn, regardless of Ba2Li2Si2O7:Sn ,Mn concentration. LE, in particular, can also increase by more than 40% along with the improvement of CRI and CQS due to the reduction of the backscattered light and the addition of green light. Research results are a valuable reference for producers who wish to improve the color quality and enhance the luminous ux of WLEDs.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115365629","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 : 2020-03-31DOI: 10.25073/jaec.202041.269
C. Tran, P. Brandstetter, Minh Huu Chau Nguyen, S. D. Ho, Phuong Nhat Pham, B. H. Dinh
In this paper, an enhanced active fault-tolerant control (FTC) is proposed to solve a current sensor failure in the induction motor drive (IMD) using two current sensors. The proposed FTC method applies only one observer to diagnose the faults and recon gure the control signals by the space stator current. The diagnosis function is made up of a comparison algorithm between the measured current space vector and the estimated space vector. Then, incorrect feedback stator currents are replaced by the estimated values in the recon guration function. The amplitude of a healthy measured current is applied to adjusted the accuracy of estimated current signals. The IMD uses the eld-oriented control (FOC) technique to control the speed and torque. The e ectiveness in stabilizing the IMD system when a current sensor error occurs is veri ed by various simulations in the Matlab-Simulink environment.
{"title":"An Enhanced Fault Tolerant Control Against Current Sensor Failures in Induction Motor Drive by Applying Space Vector","authors":"C. Tran, P. Brandstetter, Minh Huu Chau Nguyen, S. D. Ho, Phuong Nhat Pham, B. H. Dinh","doi":"10.25073/jaec.202041.269","DOIUrl":"https://doi.org/10.25073/jaec.202041.269","url":null,"abstract":"In this paper, an enhanced active fault-tolerant control (FTC) is proposed to solve a current sensor failure in the induction motor drive (IMD) using two current sensors. The proposed FTC method applies only one observer to diagnose the faults and recon gure the control signals by the space stator current. The diagnosis function is made up of a comparison algorithm between the measured current space vector and the estimated space vector. Then, incorrect feedback stator currents are replaced by the estimated values in the recon guration function. The amplitude of a healthy measured current is applied to adjusted the accuracy of estimated current signals. The IMD uses the eld-oriented control (FOC) technique to control the speed and torque. The e ectiveness in stabilizing the IMD system when a current sensor error occurs is veri ed by various simulations in the Matlab-Simulink environment.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124741026","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 : 2020-03-31DOI: 10.25073/jaec.202041.278
Y. Bazilevs, K. Takizawa, T. Tezduyar, M. Hsu, Yuto Otoguro, Hiroki Mochizuki, Michael C. H. Wu
The challenges encountered in computational analysis of wind turbines and turbomachinery include turbulent rotational flows, complex geometries, moving boundaries and interfaces, such as the rotor motion, and the fluid-structure interaction (FSI), such as the FSI between the wind turbine blade and the air. The Arbitrary Lagrangian-Eulerian (ALE) and Space-Time (ST) Variational Multiscale (VMS) methods and isogeometric discretization have been effective in addressing these challenges. The ALE-VMS and ST-VMS serve as core computational methods. They are supplemented with special methods like the Slip Interface (SI) method and ST Isogeometric Analysis with NURBS basis functions in time. We describe the core and special methods and present, as examples of challenging computations performed, computational analysis of horizontal and vertical-axis wind turbines and flow-driven This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Wind Turbine and Turbomachinery Computational Analysis with the ALE and Space-Time Variational Multiscale Methods and Isogeometric Discretization","authors":"Y. Bazilevs, K. Takizawa, T. Tezduyar, M. Hsu, Yuto Otoguro, Hiroki Mochizuki, Michael C. H. Wu","doi":"10.25073/jaec.202041.278","DOIUrl":"https://doi.org/10.25073/jaec.202041.278","url":null,"abstract":"The challenges encountered in computational analysis of wind turbines and turbomachinery include turbulent rotational flows, complex geometries, moving boundaries and interfaces, such as the rotor motion, and the fluid-structure interaction (FSI), such as the FSI between the wind turbine blade and the air. The Arbitrary Lagrangian-Eulerian (ALE) and Space-Time (ST) Variational Multiscale (VMS) methods and isogeometric discretization have been effective in addressing these challenges. The ALE-VMS and ST-VMS serve as core computational methods. They are supplemented with special methods like the Slip Interface (SI) method and ST Isogeometric Analysis with NURBS basis functions in time. We describe the core and special methods and present, as examples of challenging computations performed, computational analysis of horizontal and vertical-axis wind turbines and flow-driven This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132222548","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 : 2020-03-31DOI: 10.25073/jaec.202041.273
Md Zannatul Arif, Rahate Ahmed, U. Sadia, Mst Shanta Islam Tultul, R. Chakma
The motive of the investigation is analyzing the categorization of fetal state code from the Cardiographic data set based on decision tree method. Cardiotocography is one of the important tools for monitoring heart rate, and this technique is widely used worldwide. Cardiotocography is applied for diagnosing pregnancy and checking fetal heart rate state condition until before delivery. This classi cation is necessary to predict fetal heart rate situation which is belonging. In this paper, we are using three input attributes of training data set quoted by LB, AC, and FM to categorize as normal, suspect or pathological where NSPF variable is used as response variable. After drawing necessary analyzing into three variables we get the 19 nodes of classi cation tree and also we have measured every single node according to statistic, criterion, weights and values. The Cardiotocography Dataset applied in this study are received from UCI Machine Learning Repository. The dataset contains 2126 observation instances with 22 attributes. In this experiment, the highest accuracy is 98.7%. Overall, the experimental results proved the viability of Classication and Regression Trees and its potential for further predictions.
{"title":"Decision Tree Method Using for Fetal State Classification from Cardiotography Data","authors":"Md Zannatul Arif, Rahate Ahmed, U. Sadia, Mst Shanta Islam Tultul, R. Chakma","doi":"10.25073/jaec.202041.273","DOIUrl":"https://doi.org/10.25073/jaec.202041.273","url":null,"abstract":"The motive of the investigation is analyzing the categorization of fetal state code from the Cardiographic data set based on decision tree method. Cardiotocography is one of the important tools for monitoring heart rate, and this technique is widely used worldwide. Cardiotocography is applied for diagnosing pregnancy and checking fetal heart rate state condition until before delivery. This classi cation is necessary to predict fetal heart rate situation which is belonging. In this paper, we are using three input attributes of training data set quoted by LB, AC, and FM to categorize as normal, suspect or pathological where NSPF variable is used as response variable. After drawing necessary analyzing into three variables we get the 19 nodes of classi cation tree and also we have measured every single node according to statistic, criterion, weights and values. The Cardiotocography Dataset applied in this study are received from UCI Machine Learning Repository. The dataset contains 2126 observation instances with 22 attributes. In this experiment, the highest accuracy is 98.7%. Overall, the experimental results proved the viability of Classication and Regression Trees and its potential for further predictions.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127039212","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 : 2020-03-31DOI: 10.25073/jaec.202041.268
T. Ganesan, P. Vasant, Pratik Sanghvi, Joshua Thomas, I. Litvinchev
Complex industrial systems often contain various uncertainties. Hence sophisticated fuzzy optimization (metaheuristics) techniques have become commonplace; and are currently indispensable for effective design, maintenance and operations of such systems. Unfortunately, such state-of-the-art techniques suffer several drawbacks when applied to largescale problems. In line of improving the performance of metaheuristics in those, this work proposes the fuzzy random matrix theory (RMT) as an add-on to the cuckoo search (CS) technique for solving the fuzzy large-scale multiobjective (MO) optimization problem; biofuel supply chain. The fuzzy biofuel supply chain problem accounts for uncertainties resulting from fluctuations in the annual electricity generation output of the biomass power plant [kWh/year]. The details of these investigations are presented and analyzed.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Random Matrix Generators for Optimizing a Fuzzy Biofuel Supply Chain System","authors":"T. Ganesan, P. Vasant, Pratik Sanghvi, Joshua Thomas, I. Litvinchev","doi":"10.25073/jaec.202041.268","DOIUrl":"https://doi.org/10.25073/jaec.202041.268","url":null,"abstract":"Complex industrial systems often contain various uncertainties. Hence sophisticated fuzzy optimization (metaheuristics) techniques have become commonplace; and are currently indispensable for effective design, maintenance and operations of such systems. Unfortunately, such state-of-the-art techniques suffer several drawbacks when applied to largescale problems. In line of improving the performance of metaheuristics in those, this work proposes the fuzzy random matrix theory (RMT) as an add-on to the cuckoo search (CS) technique for solving the fuzzy large-scale multiobjective (MO) optimization problem; biofuel supply chain. The fuzzy biofuel supply chain problem accounts for uncertainties resulting from fluctuations in the annual electricity generation output of the biomass power plant [kWh/year]. The details of these investigations are presented and analyzed.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116984860","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 : 2019-12-31DOI: 10.25073/jaec.201934.249
Hsiao-Yi Lee, P. X. Le, Doan Quoc Anh Nguyen
When compared with two conformal phosphor and in-cup phosphor structures, the remote phosphor structure has higher luminescent performance. However, it is di cult to control the color quality of the remote phosphor structure, so it has become a research target in recent years. So far, there are two remote phosphor structures used to improve color quality including dual-layer phosphor con guration and triple-layer phosphor con guration. This study suggests using those two con gurations to make multi-chip white LEDs (WLEDs) that can achieve adequate values in color rendering index (CRI), color quality scale (CQS), luminous efcacy (LE) and color uniformity. WLEDs with color temperature of 5600 K are applied. Research results show that the triple-layer phosphor con guration is superior in CRI, CQS, LE. Besides, the color deviation decreases signi cantly, meaning that the color homogeneity increases with the triple-layer phosphor con guration. This can be demonstrated by analyzing the scattering characteristics of phosphor classes through Mie theory, thus making the research results more reliable and valuable for producing quality WLEDs.
{"title":"Selecting a Suitable Remote Phosphor Configuration for Improving Color Quality of White Led","authors":"Hsiao-Yi Lee, P. X. Le, Doan Quoc Anh Nguyen","doi":"10.25073/jaec.201934.249","DOIUrl":"https://doi.org/10.25073/jaec.201934.249","url":null,"abstract":"When compared with two conformal phosphor and in-cup phosphor structures, the remote phosphor structure has higher luminescent performance. However, it is di cult to control the color quality of the remote phosphor structure, so it has become a research target in recent years. So far, there are two remote phosphor structures used to improve color quality including dual-layer phosphor con guration and triple-layer phosphor con guration. This study suggests using those two con gurations to make multi-chip white LEDs (WLEDs) that can achieve adequate values in color rendering index (CRI), color quality scale (CQS), luminous efcacy (LE) and color uniformity. WLEDs with color temperature of 5600 K are applied. Research results show that the triple-layer phosphor con guration is superior in CRI, CQS, LE. Besides, the color deviation decreases signi cantly, meaning that the color homogeneity increases with the triple-layer phosphor con guration. This can be demonstrated by analyzing the scattering characteristics of phosphor classes through Mie theory, thus making the research results more reliable and valuable for producing quality WLEDs.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122897708","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 : 2019-12-31DOI: 10.25073/jaec.201934.265
M. Sazzad, Md Samdani Azad, Avishek Ghosh
This paper deals with the irregular pro le of braced steel frame building along the vertical direction with shear link bracing systems. The underlying fact of the paper is the e ect of the seismic force in braced frames with di erent types of irregularities including geometric irregularity, column discontinuity, and overhanging mass. For each successive model, the position of shear link bracings has been xed to make the study e ective. This study has investigated the vulnerable e ect of irregular pro les in steel frame buildings. To attain the nonlinear property of each element of the frame, the pushover analysis method along with the equivalent static force method has been adopted for the present study. UBC97 code has been used here for linear static analysis while the parameters for nonlinear static analysis are authenticated from FEMA356. Investigations on di erent frames exhibit that regular pro le with symmetry in mass is more e cient while using overhanging mass is detrimental as the formation of nonlinear hinge occurs at minimum load in the model with overhanging mass compared to other frames.
{"title":"Effects of Vertical Irregularity in Steel Frame with Shear Linked Steel Bracings","authors":"M. Sazzad, Md Samdani Azad, Avishek Ghosh","doi":"10.25073/jaec.201934.265","DOIUrl":"https://doi.org/10.25073/jaec.201934.265","url":null,"abstract":"This paper deals with the irregular pro le of braced steel frame building along the vertical direction with shear link bracing systems. The underlying fact of the paper is the e ect of the seismic force in braced frames with di erent types of irregularities including geometric irregularity, column discontinuity, and overhanging mass. For each successive model, the position of shear link bracings has been xed to make the study e ective. This study has investigated the vulnerable e ect of irregular pro les in steel frame buildings. To attain the nonlinear property of each element of the frame, the pushover analysis method along with the equivalent static force method has been adopted for the present study. UBC97 code has been used here for linear static analysis while the parameters for nonlinear static analysis are authenticated from FEMA356. Investigations on di erent frames exhibit that regular pro le with symmetry in mass is more e cient while using overhanging mass is detrimental as the formation of nonlinear hinge occurs at minimum load in the model with overhanging mass compared to other frames.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129342784","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 : 2019-12-31DOI: 10.25073/jaec.201934.256
Faiza Zaamoune, T. Menacer, R. Lozi, Guanrong Chen
In this paper, hidden bifurcation routes to multiscroll chaotic attractors generated by saturated function series are explored. The method to nd such hidden bifurcation routes (HBR) depending upon two parameters is similar to the method introduced by Menacer, et al. (2016) for Chua multiscroll attractors. These HBR are characterized by the maximal range extension (MARE) of their attractors and coding the appearance order of the scrolls under the control of the two parameters. Moreover, these HDR have interesting symmetries with respect to the two parameters. The novelty that this article introduces, is rstly the paradigm of MARE and the formula giving their approximate value depending upon parameters p and q, which is linked to the size of the scrolls; secondly the coding of the HBR which is de ned for the rst time including the basic cell ; and thirdly unearthing the symmetries of these routes, allowing to obtain their coding without any numerical computation.
{"title":"Symmetries in Hidden Bifurcation Routes to Multiscroll Chaotic Attractors Generated by Saturated Function Series","authors":"Faiza Zaamoune, T. Menacer, R. Lozi, Guanrong Chen","doi":"10.25073/jaec.201934.256","DOIUrl":"https://doi.org/10.25073/jaec.201934.256","url":null,"abstract":"In this paper, hidden bifurcation routes to multiscroll chaotic attractors generated by saturated function series are explored. The method to nd such hidden bifurcation routes (HBR) depending upon two parameters is similar to the method introduced by Menacer, et al. (2016) for Chua multiscroll attractors. These HBR are characterized by the maximal range extension (MARE) of their attractors and coding the appearance order of the scrolls under the control of the two parameters. Moreover, these HDR have interesting symmetries with respect to the two parameters. The novelty that this article introduces, is rstly the paradigm of MARE and the formula giving their approximate value depending upon parameters p and q, which is linked to the size of the scrolls; secondly the coding of the HBR which is de ned for the rst time including the basic cell ; and thirdly unearthing the symmetries of these routes, allowing to obtain their coding without any numerical computation.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130491465","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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