ISSN: 3079-4382

Issue 1, 2025

Editor(s)-in-Chief: Thanh-Hai Nguyen, Ha Quang Thinh Ngo and Mai-Ha Phan

Articles
Information

Aerodynamic Performance Analysis of E387 and S1010 Turbine Blade Profile
Appears in:
sumare 25(1):

Authors:
Dinh Quy Vu, Van Y Nguyen, Thi Tuyet Nhung Le

Abstract:
This paper investigates the changes in lift and drag coefficients, as well as the lift-to-drag ratio, of two airfoils designed for small wind turbines operating at low Reynolds numbers. The results include 2D simulations performed using the commercial software ANSYS Fluent 2019. The two selected ai…This paper investigates the changes in lift and drag coefficients, as well as the lift-to-drag ratio, of two airfoils designed for small wind turbines operating at low Reynolds numbers. The results include 2D simulations performed using the commercial software ANSYS Fluent 2019. The two selected airfoils, EPU-E387 and EPU-S1010, are newly developed and have not yet been studied for their aerodynamic performance. The research method involves varying the angle of attack to determine the optimal angle and identify which airfoil offers greater stability. The Reynolds numbers applied in the 2D simulations include 50,000, 60,000, 90,000, and 120,000. The simulation results indicate that the EPU-E387 airfoil achieves the highest lift-to-drag coefficient at the optimal angle of attack, which is 13.13% greater than that of the EPU-S1010 airfoil at Reynolds number 120,000. Additionally, the EPU-E387 airfoil demonstrates greater stability compared to the EPU-S1010 at higher angles of attack.
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Evaluation of a 3D-Printed Exoskeleton for Reducing Lower Back Muscle Load in Tomato Greenhouse Applications
Appears in:
sumare 25(1):

Author:
Dang Khanh Linh Le

Abstract:
Lifting and carrying tasks are known to increase the risk of work-related musculoskeletal disorders, particularly in the lower back region. This study aims to evaluate the effectiveness of a 3D-printed prototyping exoskeleton (RPE) in reducing the strain on lower back muscles during the transport o…Lifting and carrying tasks are known to increase the risk of work-related musculoskeletal disorders, particularly in the lower back region. This study aims to evaluate the effectiveness of a 3D-printed prototyping exoskeleton (RPE) in reducing the strain on lower back muscles during the transport of fruit boxes in a tomato greenhouse. A 3D-printed exoskeleton was designed and tested, with participants performing tasks such as lifting, carrying, and lowering heavy objects on tomato farms. The evaluation involved comparing muscle activity with and without the exoskeleton intervention. Muscle activity data were collected from 15 participants, focusing on the erector spinae (ES), latissimus dorsi (LD), anterior deltoid (AD), and medial deltoid (MD) muscles. The results demonstrated that using the exoskeleton significantly reduced the load on back muscles by 55.65% to 63.55% during lifting. Additionally, during carrying tasks, the exoskeleton reduced the load on the anterior deltoid muscle by 7.00% to 8.61%. The RPE also effectively decreased rectus femoris activity during dynamic lifting and carrying tasks, potentially alleviating pain and discomfort and reducing the risk of developing back-related disorders.
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Study on dyeing ability of cotton fabric 100% with naphthaquinone extracted from nipa coconut shells
Appears in:
sumare 25(1):

Authors:
Hue Trinh Thi Kim , Thanh Quynh Le Song

Abstract:
Natural dyes are known widely thanks to friendly properties to environment as health protecting ability for human. In this study, naphthaquinone of nipa coconut shells extracted by the reflux method that created effectively. The influences of ratio of dye extract, temperatures and time of dyeing an…Natural dyes are known widely thanks to friendly properties to environment as health protecting ability for human. In this study, naphthaquinone of nipa coconut shells extracted by the reflux method that created effectively. The influences of ratio of dye extract, temperatures and time of dyeing and types of mordants based on the color strength (K/S) and color difference (DE) were studied. Our study applies the methods of extracting colorants in ethanolsolvent, dyeing on an infrared dyeing machine, Mesdanby the exhaust dyeingmethod, measuring color on an X-Rite Color i5 spectrometer machine, analyzingeffecting parameters by CIELabpopular color space, and measuring Fourier-transform infrared (FTIR) spectroscopy to evaluate the presence of naphthaquinone in dye extractand bonding on fabric, testing morescanning electron microscopy (SEM) to observe the surface of dyedsamplesclearly. As results, the Nipa fruticans shell extract can dye 100% cotton fabric with a color difference ∆E of 41.07 and a K/S color strength of 12.96 when dyed with 10% CuSO4.7H2O because of their complex formation with the colorant with cellulose. Color fastness to washing on dyed cotton samples according to the ISO 105 – C06 A1S and ISO 105-X12 standard were tested to clarify further impacts of mordants to dye ability.

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Fuzzy AHP for Prioritizing Factors in the Selection of Shipping Lines within the Maritime Transport Market in Vietnam
Appears in:
sumare 25(1):

Authors:
Xuan-Hoang Anh Dang, Thuy-Trang Nguyen

Abstract:
INTRODUCTION: Selecting suitable shipping lines is crucial for supply chain efficiency, particularly in Vietnam’s maritime sector. OBJECTIVES: This study seeks to identify and prioritise key criteria affecting shipping line selection from the perspective of freight forwarders. METHODS: The Fuzzy …INTRODUCTION: Selecting suitable shipping lines is crucial for supply chain efficiency, particularly in Vietnam’s maritime sector.
OBJECTIVES: This study seeks to identify and prioritise key criteria affecting shipping line selection from the perspective of freight forwarders.
METHODS: The Fuzzy Analytic Hierarchy Process (FAHP) was applied to evaluate multiple decision-making factors.
RESULTS: Competitive freight rates, container availability, and special cargo capabilities were ranked as the most influential criteria.
CONCLUSION: Findings highlight the need for carriers to enhance service reliability and cost-efficiency to meet the demands of developing markets.
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FEM-Based Analysis of Interference Fit for High-Precision Mechanical Assemblies
Appears in:
sumare 25(1):

Authors:
Truong Minh Nhat, Pham Manh Truong, Ngo Thanh Binh, Vo Hoang Khang, Huynh Phat Dat, Vo Tung Linh

Abstract:
This study presents an interference fit study that supports the design and evaluation of press-fit assemblies. The simulation model is based on the Thick-Walled Cylinder Theory (TCT) to accurately predict contact pressure, pressing force, and stress distribution during assembly and disassembly. The…This study presents an interference fit study that supports the design and evaluation of press-fit assemblies. The simulation model is based on the Thick-Walled Cylinder Theory (TCT) to accurately predict contact pressure, pressing force, and stress distribution during assembly and disassembly. The shaft-bearing assembly is machined with high precision for experimentation. The results show good agreement between the FEM simulation and the theoretical stress distribution, confirming the mechanical behavior of the interference fit. Experimental verification of the pressing force is also performed and compared with the simulation, showing consistent trends. The simulation model helps evaluate the assembly performance in different tolerance and coefficient of friction domains, providing a practical solution for high-precision mechanical assemblies.
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Scope

The aim of EAI Endorsed Transactions on Sustainable Manufacturing and Renewable Energy is to serve as an advanced forum for researchers, scholars, practitioners, and policymakers to disseminate cutting-edge research and advancements in sustainable manufacturing and renewable energy. This journal focuses on interdisciplinary collaboration and provides insights into sustainable practices, technologies, and methodologies that contribute to the global transition towards environmentally responsible manufacturing and energy systems.

INDEXING: Google Scholar, Crossref

Editors-in-Chief:
Thanh-Hai Nguyen, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Vietnam
Ha Quang Thinh Ngo, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Vietnam
Mai-Ha Phan, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Vietnam
Editorial Te…

Editors-in-Chief:
Thanh-Hai Nguyen, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Vietnam
Ha Quang Thinh Ngo, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Vietnam
Mai-Ha Phan, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Vietnam
Editorial Team
Truong Ton Hien Duc, RMIT University, Australia
Linh N K Duong, University of the West of England, Bristol, UK
Ivan Kristianto Singgih, University of Surabaya, Surabaya, Indonesia
Duc Khai Lam, University of Information Technology (UIT), VNU-HCM, Vietnam
Dinh Tuan Tran, Ritsumeikan University, Japan
Goh Thian Lai, Universiti Kebangsaan Malaysia, Selangor, Malaysia
Vu Thi Thu Huong, Vrije Universiteit Brussel, Brussel, Belgium
Trung Q. Le, University of South Florida, US
Alex Tran, National Tsing Hua University, Taiwan
Jihad H. Asad, Palestine Technical University- Kadoorie, Palestine
Phat Kim Huynh, University of South Florida, US
Huafeng Tang, Jilin University, Jilin, China
Mingwei Zhang, China University of Mining and Technology, Jiangsu, China
Harry Saroglou, National Technical University of Athens, Athens, Greece
Rini Asnida Abdullah, Universiti Teknologi Malaysia, Malaysia
Nur Ailie Sofyaiana Serasa, Asia Pacific University of Technology & Innovation (APU), Malaysia
Phan Cong Vinh, Nguyen Tat Thanh University, Vietnam
Ionela Prodan, University of Grenoble Alpes, France
Tran Minh Quang, Ho Chi Minh City University of Technology, Vietnam
Pham Hoai Luan, NARA Institute of Science and Technology, Japan

Publisher: EAI
ISSN: 3079-4382
Volume: 2

Published: 2025-04-25

EUDL

Aerodynamic Performance Analysis of E387 and S1010 Turbine Blade Profile

Evaluation of a 3D-Printed Exoskeleton for Reducing Lower Back Muscle Load in Tomato Greenhouse Applications

Study on dyeing ability of cotton fabric 100% with naphthaquinone extracted from nipa coconut shells

Fuzzy AHP for Prioritizing Factors in the Selection of Shipping Lines within the Maritime Transport Market in Vietnam

FEM-Based Analysis of Interference Fit for High-Precision Mechanical Assemblies

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