Pub Date : 2023-03-03DOI: 10.14416/j.asep.2023.03.001
Nutmethee Tuchinda, S. Moryadee, C. U-tapao, Leamthong Laokhongthavorn
With the increase of reliance of LNG for Thailand, tons of liquefied natural gas (LNG) are imported, however there is no report that describes the engagement by a mathematical model. This study constructed a mathematical model to analyze LNG supply of Thailand. Based on the outcome in 2022, the offered LNG supply pattern, which reduced the total LNG price, risk of politics and risk of maritime, exhibited that Malaysia, Brunei, and Australia are LNG exporter of Thailand. Additionally, when the demand of LNG in Thailand increase, the demand from Qatar does not increase due to the low competitiveness. Moreover, in the study of diversification, the details suggested the raking of suppliers that Thailand should import. The rank is as follows: Brunei, Malaysia, Australia, USA, and Trinidad & Tobacco. The study of the objective factors on the decision of Thailand shows that the risk associated with shipping is ineffective to Thailand’s LNG supply due to the geographical closeness of the supplier countries. However, the risk connected to the political of supplier nations is influenced by the decision of the supply. Furthermore, this study revealed the limitation of the research associated with the LNG supply of Thailand. Hence, the finding of this study not only presented the alternative policy of Thailand but also consolidated Thailand’s energy security.
{"title":"LNG Portfolio Diversification Optimization Model of Thailand","authors":"Nutmethee Tuchinda, S. Moryadee, C. U-tapao, Leamthong Laokhongthavorn","doi":"10.14416/j.asep.2023.03.001","DOIUrl":"https://doi.org/10.14416/j.asep.2023.03.001","url":null,"abstract":"With the increase of reliance of LNG for Thailand, tons of liquefied natural gas (LNG) are imported, however there is no report that describes the engagement by a mathematical model. This study constructed a mathematical model to analyze LNG supply of Thailand. Based on the outcome in 2022, the offered LNG supply pattern, which reduced the total LNG price, risk of politics and risk of maritime, exhibited that Malaysia, Brunei, and Australia are LNG exporter of Thailand. Additionally, when the demand of LNG in Thailand increase, the demand from Qatar does not increase due to the low competitiveness. Moreover, in the study of diversification, the details suggested the raking of suppliers that Thailand should import. The rank is as follows: Brunei, Malaysia, Australia, USA, and Trinidad & Tobacco. The study of the objective factors on the decision of Thailand shows that the risk associated with shipping is ineffective to Thailand’s LNG supply due to the geographical closeness of the supplier countries. However, the risk connected to the political of supplier nations is influenced by the decision of the supply. Furthermore, this study revealed the limitation of the research associated with the LNG supply of Thailand. Hence, the finding of this study not only presented the alternative policy of Thailand but also consolidated Thailand’s energy security.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49641473","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 : 2023-02-27DOI: 10.14416/j.asep.2023.02.010
I. Aliyu, S. M. Sapuan, E. S. Zainudin, Mohd Yusoff Mohamed Zuhri, R. Yahaya
Aluminium alloy of grade LM26 was used as a matrix and sugar palm fiber ash (SPFA) as reinforcement to investigate its microstructural and mechanical characteristics. Stir casting, a cost-effective method of casting was utilized to fabricate the composites, by altering SPFA from 0 to 10 wt% in 2 wt% increments in an LM26 Al-alloy matrix. The microstructural analysis and phase identification were identified with Scanning Electron Microscopy (SEM) attached to Energy Dispersive Spectroscopy (EDS) and X-ray Diffraction (XRD), respectively. The composites were tested for density, hardness, tensile strength, compression strength, and impact energy according to ASTM. Microstructural images revealed a homogeneous distribution of SPFA in the LM26 Al-alloy matrix. The phases identified in the composites were α-Al, hard SiO2, Mg2Si, and Al5FeSi. The addition of SPFA decreased the composite density and impact energy by 3.85% and 46.68%, respectively. The compression strength and tensile strength of the composites increased by 23.73% and 27.83%, respectively, at an 8 wt% addition of SPFA. However, further addition of up to 10 wt% SPFA showed a decreasing trend in compression and tensile strength. The hardness of the composites increased by 60.80% after a 10 wt% addition of SPFA. These findings showed that synthesized LM26 Al-SPFA composites could be used in the automotive industries for the fabrication of pistons, connecting rods, brake shoes, and other components due to their excellent mechanical characteristics.
{"title":"Investigation on Microstructure and Mechanical Characteristics of Sugar Palm Fibre Ash Reinforced LM26 Al-Matrix Composites","authors":"I. Aliyu, S. M. Sapuan, E. S. Zainudin, Mohd Yusoff Mohamed Zuhri, R. Yahaya","doi":"10.14416/j.asep.2023.02.010","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.010","url":null,"abstract":"Aluminium alloy of grade LM26 was used as a matrix and sugar palm fiber ash (SPFA) as reinforcement to investigate its microstructural and mechanical characteristics. Stir casting, a cost-effective method of casting was utilized to fabricate the composites, by altering SPFA from 0 to 10 wt% in 2 wt% increments in an LM26 Al-alloy matrix. The microstructural analysis and phase identification were identified with Scanning Electron Microscopy (SEM) attached to Energy Dispersive Spectroscopy (EDS) and X-ray Diffraction (XRD), respectively. The composites were tested for density, hardness, tensile strength, compression strength, and impact energy according to ASTM. Microstructural images revealed a homogeneous distribution of SPFA in the LM26 Al-alloy matrix. The phases identified in the composites were α-Al, hard SiO2, Mg2Si, and Al5FeSi. The addition of SPFA decreased the composite density and impact energy by 3.85% and 46.68%, respectively. The compression strength and tensile strength of the composites increased by 23.73% and 27.83%, respectively, at an 8 wt% addition of SPFA. However, further addition of up to 10 wt% SPFA showed a decreasing trend in compression and tensile strength. The hardness of the composites increased by 60.80% after a 10 wt% addition of SPFA. These findings showed that synthesized LM26 Al-SPFA composites could be used in the automotive industries for the fabrication of pistons, connecting rods, brake shoes, and other components due to their excellent mechanical characteristics.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46423856","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 : 2023-02-20DOI: 10.14416/j.asep.2023.02.009
S. Kawichai, Sopittaporn Sillapapiromsuk, S. Bootdee
The Eastern Economic Corridor (EEC) project initiative has an adverse impact on the increasing problem of air pollution. This research aims to determine ambient NO2, O3, and SO2 levels in the industrial area (IT) and urban area (UB) in Rayong city as part of a health risk assessment from 2018 to 2020. The average NO2, O3, and SO2 concentrations at IT site were ranged from 23.5–24.7 μg/m3, 42.7–56.7 μg/m3, and 12.5–14.0 μg/m3, while those at UB site were 14.8–20.7 μg/m3, 42.5–68.3 μg/m3, and 3.2–4.7 μg/m3, respectively. Their concentrations in dry season were higher than those in wet season at both IT and UB sites. The days in the IT site exceeded the daily WHO guideline of NO2 was 34.8–44.0%, while those in the UB site were 10.8–34.5%. The hazard quotient (HQ) values for a non-carcinogenic risk to human health caused by NO2 exposure indicated a medium hazard (HQ = 1.1–10.0), whereas the HQ values for SO2 and O3 indicated a negligible risk (HQ < 1.0). The total non-carcinogenic risk (HI) from air pollutants contamination being exposed concurrently, on the other hand, indicated risk levels that are likely to affect health, particularly children. Therefore, environmental management and protection in Rayong city are important for people who live in industrial and urban areas, especially during dry period.
{"title":"Health Risk Assessment of Gaseous Pollutants in the Ambient Environment of Rayong City, Thailand: The Initiative of the EEC Area","authors":"S. Kawichai, Sopittaporn Sillapapiromsuk, S. Bootdee","doi":"10.14416/j.asep.2023.02.009","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.009","url":null,"abstract":"The Eastern Economic Corridor (EEC) project initiative has an adverse impact on the increasing problem of air pollution. This research aims to determine ambient NO2, O3, and SO2 levels in the industrial area (IT) and urban area (UB) in Rayong city as part of a health risk assessment from 2018 to 2020. The average NO2, O3, and SO2 concentrations at IT site were ranged from 23.5–24.7 μg/m3, 42.7–56.7 μg/m3, and 12.5–14.0 μg/m3, while those at UB site were 14.8–20.7 μg/m3, 42.5–68.3 μg/m3, and 3.2–4.7 μg/m3, respectively. Their concentrations in dry season were higher than those in wet season at both IT and UB sites. The days in the IT site exceeded the daily WHO guideline of NO2 was 34.8–44.0%, while those in the UB site were 10.8–34.5%. The hazard quotient (HQ) values for a non-carcinogenic risk to human health caused by NO2 exposure indicated a medium hazard (HQ = 1.1–10.0), whereas the HQ values for SO2 and O3 indicated a negligible risk (HQ < 1.0). The total non-carcinogenic risk (HI) from air pollutants contamination being exposed concurrently, on the other hand, indicated risk levels that are likely to affect health, particularly children. Therefore, environmental management and protection in Rayong city are important for people who live in industrial and urban areas, especially during dry period.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41446052","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 : 2023-02-17DOI: 10.14416/j.asep.2023.02.008
Sukunya Areeya, E. Panakkal, M. Sriariyanun, T. Kangsadan, A. Tawai, S. Amornraksa, U. W. Hartley, P. Yasurin
Excessive dependence on fossil resources to supply the increased energy demands has led to unsustainable growth. Hence, there is a necessity to shift our reliance from non-renewable to renewable resources. In this scenario, lignocellulosic biorefinery gains its importance because lignocellulosic biomass can be converted into various value-added products. However, biomass pretreatment is necessary due to the recalcitrant nature of the biomass. Various pretreatment techniques are employed to convert biomass into a more amenable structure to be utilized in the further steps of biorefinery. Hence, this review concentrates on different chemical pretreatment techniques used currently on biomass along with their modes of action on the biomass. This review will provide a detailed concept of various chemical pretreatments and the recent developments in pretreatment techniques. Despite this, the limitations of the current pretreatment strategies and the difficulties in their industrial applications are also discussed, which could provide innovative ideas to overcome these issues.
{"title":"A Review on Chemical Pretreatment of Lignocellulosic Biomass for the Production of Bioproducts: Mechanisms, Challenges and Applications","authors":"Sukunya Areeya, E. Panakkal, M. Sriariyanun, T. Kangsadan, A. Tawai, S. Amornraksa, U. W. Hartley, P. Yasurin","doi":"10.14416/j.asep.2023.02.008","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.008","url":null,"abstract":"Excessive dependence on fossil resources to supply the increased energy demands has led to unsustainable growth. Hence, there is a necessity to shift our reliance from non-renewable to renewable resources. In this scenario, lignocellulosic biorefinery gains its importance because lignocellulosic biomass can be converted into various value-added products. However, biomass pretreatment is necessary due to the recalcitrant nature of the biomass. Various pretreatment techniques are employed to convert biomass into a more amenable structure to be utilized in the further steps of biorefinery. Hence, this review concentrates on different chemical pretreatment techniques used currently on biomass along with their modes of action on the biomass. This review will provide a detailed concept of various chemical pretreatments and the recent developments in pretreatment techniques. Despite this, the limitations of the current pretreatment strategies and the difficulties in their industrial applications are also discussed, which could provide innovative ideas to overcome these issues.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44079281","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 : 2023-02-15DOI: 10.14416/j.asep.2023.02.007
A. Aabid, Jasim I. Humadi, Ghazwan S. Ahmed, A. Jarullah, Mustafa Abdulbari Ahmed, Waqas Abdullah
This work reports the removal of dibenzothiophene (DBT) via an oxidative desulfurization (ODS) process over Zn/Al2O3 catalyst utilizing H2O2 as an oxidizing agent. The influence of operating parameters, such as reaction temperature, time was investigated. Results clarified that recognizably high DBT elimination of 93.781% has been achieved within 80 min using 0.1 g (9% Zn/Al2O3) catalyst at 90 °C reaction temperature. It was observed that an overall ODS catalytic efficiency order of: 9% ZnO/γ-Al2O3> 6% ZnO/γ-Al2O3> 3% ZnO/γ-Al2O3. Discernment of the surface morphology and textural properties of prepared nano-catalysts were characterized utilizing X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FTIR) and BET surface area analysis, which assisted in evaluating the performance of the prepared nano-catalysts. Owing to its highly effective nature, operation at moderate conditions and cost-effectiveness, this work can be conceived as an efficient methodology for the ODS operation of fuel oils on an industrial scale.
{"title":"Enhancement of Desulfurization Process for Light Gas Oil Using New Zinc Oxide Loaded Over Alumina Nanocatalyst","authors":"A. Aabid, Jasim I. Humadi, Ghazwan S. Ahmed, A. Jarullah, Mustafa Abdulbari Ahmed, Waqas Abdullah","doi":"10.14416/j.asep.2023.02.007","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.007","url":null,"abstract":"This work reports the removal of dibenzothiophene (DBT) via an oxidative desulfurization (ODS) process over Zn/Al2O3 catalyst utilizing H2O2 as an oxidizing agent. The influence of operating parameters, such as reaction temperature, time was investigated. Results clarified that recognizably high DBT elimination of 93.781% has been achieved within 80 min using 0.1 g (9% Zn/Al2O3) catalyst at 90 °C reaction temperature. It was observed that an overall ODS catalytic efficiency order of: 9% ZnO/γ-Al2O3> 6% ZnO/γ-Al2O3> 3% ZnO/γ-Al2O3. Discernment of the surface morphology and textural properties of prepared nano-catalysts were characterized utilizing X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FTIR) and BET surface area analysis, which assisted in evaluating the performance of the prepared nano-catalysts. Owing to its highly effective nature, operation at moderate conditions and cost-effectiveness, this work can be conceived as an efficient methodology for the ODS operation of fuel oils on an industrial scale.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48624534","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 : 2023-02-06DOI: 10.14416/j.asep.2023.02.005
Agbeboh Newton Itua, O. Oluwole, Daramola Oluyemi Ojo, Adegun Miracle Hope
The influence of abrasion on biomedical implant in human body is a constant cause of pain, discomfort and sometimes a repeat of surgery as a result of the complications from the effects of wear on the implants and the negative consequences of the resultant abrasive particles on the surrounding tissue and bodily environment. To alleviate this, a titanium-hydroxyapatite hybrid reinforced polyetheretherketone (PEEK) biocomposite material was developed, characterized and tested. X-Ray Diffraction characterization revealed that the calcined eggshell was composed mainly of lime and portlandite. The calcined eggshell was then used in the synthesis of hydroxyapatite powder (HAp) with characteristic bands confirmed by FTIR spectroscopic analysis. Biocomposites were developed from the blend of titanium and hydroxyapatite powders in varying proportions as reinforcements in PEEK matrix. The developed composites and control sample were subjected to abrasion and water absorption tests from where it was revealed that biocomposite sample reinforced with 10 wt.% orthophosphoric acid synthesized eggshell possess optimum abrasion resistance with a wear index of 0.20 mg/cycle with an acceptable level of water absorption next to the unreinforced polyetheretherketone over a period of 35 days.
{"title":"Abrasion Resistance and Water Absorption Characteristics of Ti-HAp Hybrid Reinforced Polyetheretherketone Biocomposites","authors":"Agbeboh Newton Itua, O. Oluwole, Daramola Oluyemi Ojo, Adegun Miracle Hope","doi":"10.14416/j.asep.2023.02.005","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.005","url":null,"abstract":"The influence of abrasion on biomedical implant in human body is a constant cause of pain, discomfort and sometimes a repeat of surgery as a result of the complications from the effects of wear on the implants and the negative consequences of the resultant abrasive particles on the surrounding tissue and bodily environment. To alleviate this, a titanium-hydroxyapatite hybrid reinforced polyetheretherketone (PEEK) biocomposite material was developed, characterized and tested. X-Ray Diffraction characterization revealed that the calcined eggshell was composed mainly of lime and portlandite. The calcined eggshell was then used in the synthesis of hydroxyapatite powder (HAp) with characteristic bands confirmed by FTIR spectroscopic analysis. Biocomposites were developed from the blend of titanium and hydroxyapatite powders in varying proportions as reinforcements in PEEK matrix. The developed composites and control sample were subjected to abrasion and water absorption tests from where it was revealed that biocomposite sample reinforced with 10 wt.% orthophosphoric acid synthesized eggshell possess optimum abrasion resistance with a wear index of 0.20 mg/cycle with an acceptable level of water absorption next to the unreinforced polyetheretherketone over a period of 35 days.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45483938","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 : 2023-02-03DOI: 10.14416/j.asep.2023.02.004
A. Dhandapani, S. Krishnasamy, R. Nagarajan, Senthil Muthu Kumar Thiagamani, Chandrasekar Muthukumar
In recent days, the uses of 3D printing have been successfully implemented in various applications due to their advantages. Besides, the need for sustainable choice has created a demand for the augmented use of thermoplastic composites. Thus, additive manufacturing techniques have become the essence of composite fabrication to achieve an automated and flexible fabrication technique. The present study used fused deposition modelling (FDM) and hot press moulding technique to produce composite samples. The composite laminates were fabricated by using acrylonitrile butadiene styrene (ABS) as polymer and woven glass fiber (GF) and woven carbon fiber (CF) used as reinforcements. Further, the laminates were subjected to inter-laminar shear strength (ILSS) and contact angle. The inter-laminar shear strength and the contact angle of hybrid samples were compared with virgin ABS and pure glass fiber-reinforced composites. The study reported a maximum ILSS of 198.5MPa achieved by GF/CF/ABS hybrid composites, which was higher by 17% and 217% compared with GF/ABS and ABS samples, respectively. The contact angle results showed an increase due to the incorporation of fibers with ABS by 5% and 13% in GF/ABS and GF/CF/ABS, respectively, contributing to the adhesion. The contact angle values achieved were 100.5°, 105.15°, and 113.39° by ABS, GF/ABS and GF/CF/ABS making them hydrophobic in nature. These developed reinforced materials, such as carbon fiber, glass fiber and ABS matrix composites, could be used in automotive, aerospace and wind energy applications.
{"title":"Study on the Inter-Laminar Shear Strength and Contact Angle of Glass Fiber/ABS and Glass Fiber/Carbon Fiber/ABS Hybrid Composites","authors":"A. Dhandapani, S. Krishnasamy, R. Nagarajan, Senthil Muthu Kumar Thiagamani, Chandrasekar Muthukumar","doi":"10.14416/j.asep.2023.02.004","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.004","url":null,"abstract":"In recent days, the uses of 3D printing have been successfully implemented in various applications due to their advantages. Besides, the need for sustainable choice has created a demand for the augmented use of thermoplastic composites. Thus, additive manufacturing techniques have become the essence of composite fabrication to achieve an automated and flexible fabrication technique. The present study used fused deposition modelling (FDM) and hot press moulding technique to produce composite samples. The composite laminates were fabricated by using acrylonitrile butadiene styrene (ABS) as polymer and woven glass fiber (GF) and woven carbon fiber (CF) used as reinforcements. Further, the laminates were subjected to inter-laminar shear strength (ILSS) and contact angle. The inter-laminar shear strength and the contact angle of hybrid samples were compared with virgin ABS and pure glass fiber-reinforced composites. The study reported a maximum ILSS of 198.5MPa achieved by GF/CF/ABS hybrid composites, which was higher by 17% and 217% compared with GF/ABS and ABS samples, respectively. The contact angle results showed an increase due to the incorporation of fibers with ABS by 5% and 13% in GF/ABS and GF/CF/ABS, respectively, contributing to the adhesion. The contact angle values achieved were 100.5°, 105.15°, and 113.39° by ABS, GF/ABS and GF/CF/ABS making them hydrophobic in nature. These developed reinforced materials, such as carbon fiber, glass fiber and ABS matrix composites, could be used in automotive, aerospace and wind energy applications.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49087685","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 : 2023-02-02DOI: 10.14416/j.asep.2023.02.003
P. Ngamsom
In this paper, disturbance rejection of DC motor PID trajectory control systems is enhanced for independent joint control of robot arms. The concept of disturbance observer is invoked to propose a linear auxiliary control that augments existing PID controllers. The design of the auxiliary control is developed using a state space approach rather than transfer function approaches commonly employed in many existing designs derived from the concept of disturbance observer. This provides new insight and leads to a compact design requiring only two design parameters. While many of the existing DC motor trajectory control systems assume the availability of current feedback from a motor coil, the proposed auxiliary control does not. This can highly facilitate its applications in the lacking situation. Realizing that the stability of the resulting control systems could be inconvenient to assert due to increased system dimension resulting from incorporating disturbance observer, compact criteria for asserting robust stability using readily available results is given explicitly. To evaluate the capability of the auxiliary control for disturbance rejection, experimental results on a DC joint motor of an articulated robot arm are given. In presence of smooth and abrupt loading variations due to gravity, it appears that the tracking error of the enhanced system can be approximately 67% of that of the unenhanced system. This result is consistent in all three rounds of experiments.
{"title":"Enhancing Disturbance Rejection of PID Controllers for DC Joint Motors of Trajectory Tracking Robots Using Disturbance Observer","authors":"P. Ngamsom","doi":"10.14416/j.asep.2023.02.003","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.003","url":null,"abstract":"In this paper, disturbance rejection of DC motor PID trajectory control systems is enhanced for independent joint control of robot arms. The concept of disturbance observer is invoked to propose a linear auxiliary control that augments existing PID controllers. The design of the auxiliary control is developed using a state space approach rather than transfer function approaches commonly employed in many existing designs derived from the concept of disturbance observer. This provides new insight and leads to a compact design requiring only two design parameters. While many of the existing DC motor trajectory control systems assume the availability of current feedback from a motor coil, the proposed auxiliary control does not. This can highly facilitate its applications in the lacking situation. Realizing that the stability of the resulting control systems could be inconvenient to assert due to increased system dimension resulting from incorporating disturbance observer, compact criteria for asserting robust stability using readily available results is given explicitly. To evaluate the capability of the auxiliary control for disturbance rejection, experimental results on a DC joint motor of an articulated robot arm are given. In presence of smooth and abrupt loading variations due to gravity, it appears that the tracking error of the enhanced system can be approximately 67% of that of the unenhanced system. This result is consistent in all three rounds of experiments.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49577233","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 : 2023-02-01DOI: 10.14416/j.asep.2023.02.002
Chang TingChen, N. Therdthai, A. Soontrunnarudrungsri
Saltiness perception is affected by both extrinsic factors, such as like packaging, receptacle or external environment, and intrinsic factors including sweetness, sourness, and viscosity. This research aimed to study the saltiness perception and sensory profiles of different types of soups. Regarding the effect of xanthan gum, additions of different concentrations of xanthan gum responded to different viscosities in soup samples significantly. Chicken clear soup and Tomyum clear soup without xanthan gum had the significantly lowest viscosity, while Tomyum cream soup and Phanaeng curry with 0.25% xanthan gum had the significantly highest viscosity. Free Choice Profiling showed the first and second dimensions accounted for more than 80% of all soups samples. For the chicken clear soup, both time and xanthan gum only affected the viscosity. According to the consumer test, it was found that xanthan gum had a significant effect on the thickness intensity of all soups, while there was no found significant effect on saltiness perception and acceptance in all types of soup in this study.
{"title":"Effect of Viscosity on Sensory Profile and Consumer Perception: Case Study of Soup- Based Products","authors":"Chang TingChen, N. Therdthai, A. Soontrunnarudrungsri","doi":"10.14416/j.asep.2023.02.002","DOIUrl":"https://doi.org/10.14416/j.asep.2023.02.002","url":null,"abstract":"Saltiness perception is affected by both extrinsic factors, such as like packaging, receptacle or external environment, and intrinsic factors including sweetness, sourness, and viscosity. This research aimed to study the saltiness perception and sensory profiles of different types of soups. Regarding the effect of xanthan gum, additions of different concentrations of xanthan gum responded to different viscosities in soup samples significantly. Chicken clear soup and Tomyum clear soup without xanthan gum had the significantly lowest viscosity, while Tomyum cream soup and Phanaeng curry with 0.25% xanthan gum had the significantly highest viscosity. Free Choice Profiling showed the first and second dimensions accounted for more than 80% of all soups samples. For the chicken clear soup, both time and xanthan gum only affected the viscosity. According to the consumer test, it was found that xanthan gum had a significant effect on the thickness intensity of all soups, while there was no found significant effect on saltiness perception and acceptance in all types of soup in this study.","PeriodicalId":8097,"journal":{"name":"Applied Science and Engineering Progress","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48299459","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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