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EPI International Journal of Engineering
Published by Universitas Hasanuddin
ISSN : 26155109     EISSN : 26210541     DOI : https://doi.org/10.25042/epi-ije
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
EPI International Journal of Engineering (EPI-IJE) is published and managed by Center of Technology, Faculty of Engineering, University of Hasanuddin (CoT, FoE, UNHAS), Indonesia. The main objective of this international journal is to create publishing opportunities and to disseminate knowledge in engineering-related topics collected from all over the world. A wide range of topics may be accepted, including from both conventional engineering and newly developed fields. Multi-disciplinary and Inter-disciplinary fields are encouraged to submit, and the topic on engineering education is also welcome. Manuscripts should be in English only. This journal system is open free-access to public in electric form, and the paper-form journal is also available. No fee is charged to accepted papers. On acceptance of submitted paper, authors are asked to submit a short copy-right form, but the authors have rights to reuse their work. The submitted manuscripts are under peer review at least by two reviewers, and publication is made biannually.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 139 Documents
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The Effect of Using Different Elastic Moduli on Vibration of Laminated CFRP Rectangular Plates Yoshihiro Narita; Michio Innami; Daisuke Narita
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.05

Abstract

This paper deals with effects of using different sets of material constants on the natural frequencies of laminated composite rectangular plates. The plate is symmetrically laminated by thin layers composed of recently developed carbon fiber reinforced plastic (CFRP) materials. Numerical experiments are conducted by using a semi-analytical solution based on the thin plate theory and the lamination theory. The displacements are assumed to accommodate any combination of classical boundary conditions. The material property is expressed by a set of four elastic constants, and some typical sets of values are cited from the recent literature. Furthermore, a new standard set of discretized constants is proposed to uncover the underlying characteristics of the existing constants. The convergence study is carried out first, and the lowest five natural frequencies are calculated for five sets of classical boundary conditions including totally free through totally clamped cases. Next, a new definition of frequency parameters is introduced to promote more physically meaningful comparison among the obtained results, and the effect of using slightly different constants is clarified for unified comparison and insights. It is also discussed to derive approximate frequency formulas by linear regression analysis and to test accuracy of the formulas.
Manufacture of Continuous Glass Fiber / Polylactic Acid (PLA) Composite and Its Properties Jeong U Roh; Woo Il Lee
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.01

Abstract

The continuous glass fiber reinforced polylactic acid (PLA) prepreg was manufactured by direct melt impregnation. The mechanical and thermal properties of PLA prepreg were observed. The properties of PLA prepreg were compared with the neat PLA and the injection molded glass fiber/PLA composite. The PLA prepreg having a fiber volume fraction of 27.7 % shows well enhanced tensile strength of 331.1 MPa, flexural strength of 528.6 MPa, and flexural modulus of 24.0 GPa. The enhancement in the heat deflection temperature (HDT) and the crystallinity were also observed. The fracture interface was inspected by FE-SEM. The degree of impregnation as a function of pulling speed was measured. The degree of impregnation at the pulling speed of 5 m/min reached over 90 % in this research.
Mathematical Modeling in Combining Photovoltaic and Thermoelectric Generator Using a Spectrum Splitter Hariyanto Hariyanto; Mustofa Mustofa; Zuryati Djafar; Wahyu H. Piarah
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.13

Abstract

The experimental stages of converting solar energy into electrical energy in Photovoltaic and Thermoelectric Generator (PV-TEG) hybird ​​takes a long time. Modeling is one approach to find out the initial data before conducting experiments leading to minimize design errors, time and budget. A mathematical model is created to analyze the performance of a PV-TEG hybrid module. Modeling is performed as an electrical circuit equivalent to Kirchoff's Curent Law (KCL) by deriving several equations corresponding to the characteristics of each module. Type of PV is amorphous Silicon (a-Si), while TEG is Bismuth Telluride (Bi2Te3). The AM1.5D standard solar spectrum is splitted its wavelength spectrum using hot mirror, where the wavelengths of 400-690 nm are transmitted to PV and 690-1150 nm are reflected to TEG. All of PV-TEG hybrid parameters, for example intensity, temperature, and material property are obtained from the specification data of each module. As a results, the maximum total power is 0.0437 W with 5.1% its efficiency.
Harmonic Response Analysis of Strut Fin on Planar Motion Mechanism Kusnindar Priohutomo; Danang Ariyanto
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.14

Abstract

In a material selection design that will be used is one important step. Because by selecting the right material with the appropriate material properties, it can be seen the harmonic response value of a structure. By knowing the value of harmonic response in a structure, at the time of testing can avoid damage to the structure. In this study the material used for Fin Planar Motion Mechanism (PMM) is Stainless Steel 304 (SS 304). To calculate the harmonic response, the SPSS method is used. From the research results in the range 1-100 Hz the displacement value is still below the limit with a maximum value of 2.50E-12 mm and a maximum stress value of 2.95E-05 Pa.
Shear Behavior of Concrete Beams Strengthened with CFRP Grid and PCM Shotcrete Andi Arwin Amiruddin
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.02

Abstract

The results of an experimental and analytical study of the shear behavior of damaged or under-strength concrete beams strengthened with carbon fiber reinforced plastics (CFRP) grid and polymer cement mortar (PCM) shotcrete describes in this paper. The aim of this study is to evaluate shear performances of reinforced concrete beams retrofitted by using PCM shotcrete and CFRP grid. Four concrete beams reinforced internally with steel and externally with both PCM and CFRP grid (longitudinal direction used CR-10 and transversal direction used CR-6) applied to the specimens were tested under three-point bending. The shear failure is initiated by a major diagonal crack within the beam shear span. This diagonal crack extended horizontally at the level of the CFRP grid. Results show that PCM shotcrete with CFRP grid is very effective for shear strengthening. Increases in strength of 140% for PGB over the RCB as control, un-retrofitted beams were noted.
Characteristics of Active Carbon from Utilization of Red Chili Trees (Capsicum annuum L) Ni Made Dwidiani; Putu Wijaya Sunu; Gusti Ngurah Nitya Santhiarsa
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.03

Abstract

This work studies the use of red chilli tree (capsicum anuumm L) waste as material of activated carbon and examines the morphological structure and elemental composition of the activated chili trees. The morphological structure was measured at TekMIRA (Pusat Penelitian dan Pengembangan Teknologi Mineral dan Batubara, Bandung) by using the scanning electron microscope (SEM), and the composition of the elements of carbon, hydrogen, nitrogen and ash is determined by the ultimate testing analysis with the ASTM D5373 standard. In the testing procedure, activated carbon is made from red chili tree waste by dehydration with a temperature of 2000 C for 1 hour and carbonized with a temperature of 3750 C for 1 hour. Then, the chemical activation (NaOH) is made in variation of concentration of 1%, 3%, and 5% with soaked time 24 hours, and dried at 2000 C for one hour. The carbonization at a concentration of 1% (NaOH) gave the best result on activated carbon from red chili trees.
Air Quality Characteristics in Junior High School Classroom with Natural Ventilation in Pangkep Regency Nur Mutmainnah; Rosady Mulyadi; Baharuddin Hamzah
EPI International Journal of Engineering Vol 2 No 2 (2019): Volume 2 Number 2, August 2019 with Special Issue on Natural Disaster and Mitigat
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082019.11

Abstract

The indoor air quality room has turned out to be a major concern due to its adverse effects on human health. This is related to the level of activity of human spend almost 90 percent of their time indoors. This study aims to identify the characteristics of air quality in classrooms with natural ventilation systems in three different schools which vary in topography and the surrounding environment, namely coastal areas, lowlands, and mountains. Air quality measurement focuses on CO, CO2 concentration, total dust content, temperature, humidity, and airflow velocity. The statistical results showed significantly different (p <0.05) in air quality parameters among those three schools. The CO and CO2 concentrations in the three schools are below the recommendations required by DOSH and ASHRAE. This clarifies that a well-used of a natural ventilation system is able to maintain the air quality in the classroom. The measurement of total dust levels was above the threshold required by the Ministry of Health of the Republic of Indonesia No.1405/MENKES/SK/XI/2002. In addition, there was a significant relationship (p <0.05) between air pollutants and meteorological factors such as temperature and air humidity in the classroom. The study found that there was an influence of human activity level and the surrounding environment on the amount of pollutants concentration in the classroom.
Prediction of Propeller Performance Using Computational Fluid Dynamics Approach Nur Amira Adam; Ahmad Fitriadhy; W. S. Kong; Faisal Mahmuddin; C. J. Quah
EPI International Journal of Engineering Vol 2 No 2 (2019): Volume 2 Number 2, August 2019 with Special Issue on Natural Disaster and Mitigat
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082019.15

Abstract

A reliable prediction approach to obtain a sufficient thrust and torque to propel the ship at desired forward speed is obviously required. To achieve this objective, the authors propose to predict the thrust coefficient (KT), torque coefficient (KQ) and efficiency (η) of the propeller in open-water model test condition using Computational Fluid Dynamics (CFD) simulation approach. The computational simulation presented in the various number of rotational speed (RPM) within the range of advance ratio J=0.1 up to 1.05. The higher value of J lead to decrease 10KQ and KT. While the η increased steadily at the lower value of J and decreased at the higher value of J. The results also showed that the propeller with 1048 rpm obtain a better efficiency at J=0.95 with η= 88.25%, 10KQ=0.1654 and KT= 0.0942. The computation result is very useful as preliminary data for propeller performance characteristics.
Processing of Drone’s Digital Image for Determining Border of Rice Fields with Edge Detection Method Suhardiman Diman; Zahir Zainuddin; Salama Manjang
EPI International Journal of Engineering Vol 2 No 2 (2019): Volume 2 Number 2, August 2019 with Special Issue on Natural Disaster and Mitigat
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082019.08

Abstract

Edge detection was the basic thing used in most image processing applications to get information from the image frame as a beginning for extracting the features of the segmentation object that will be detected. Nowadays, many edge detection methods create doubts in choosing the right edge detection method and according to image conditions. Based on the problems, a study was conducted to compare the performance of edge detection using methods of canny, Sobel and laplacian by using object of rice field. The program was created by using the Python programming language on OpenCV. The result of the study on one image test that the Canny method produces thin and smooth edges and did not omit the important information on the image while it has required a lot of computing time. Classification is generally started from the data acquisition process; pre-processing and post-processing. Canny edge detection can detect actual edges with minimum error rates and produce optimal image edges. The threshold value obtained from the Canny method was the best and optimal threshold value for each method. The result of a test by comparing the three methods showed that the Canny edge detection method gives better results in determining the rice field boundary, which was 90% compared to Sobel 87% and laplacian 89%.
Stability Analysis of Aifa Bridge Abutment in Fafurwar District, Bintuni Bay Regency, West Papua Province Muhammad Yunus; Zharin F Syahdinar
EPI International Journal of Engineering Vol 2 No 2 (2019): Volume 2 Number 2, August 2019 with Special Issue on Natural Disaster and Mitigat
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082019.12

Abstract

In the construction of public works infrastructure, especially road infrastructure works, bridge construction work plays a very important role besides the construction of the road itself. One of the things that deserves the attention of the planners in designing a bridge structure is the design of the substructure, this is because the substructure determines the quality and service life of a bridge. In addition, at present many cases of bridge structure failures are caused by failures of the substructure in holding the load acting on the bridge. The aim of this study was to determine the stability of the abutment to sliding failure and the stability of the abutment to overturning failure on the construction of the Aifa bridge in the Bintuni Bay Regency. From the results of the calculation of the stability of the abutments to sliding failure, when the abutments are in normal conditions was obtained safety factor (SF) values 1,907, in condition of the upper structure load is not working was obtained safety factor (SF) values 1,045 and during earthquake conditions was obtained safety factor (SF) values 1,419. While the results of the calculation of the stability of the abutments to overturning failure, when the abutments are in normal conditions was obtained safety factor (SF) values 4,640, in condition of the the upper structure load is not working was obtained safety factor (SF) values 1,658 and during earthquake conditions was obtained safety factor (SF) values 3,159. Because obtained safety factor (SF) values greater than 1, so that the stability of the abutment is safe to sliding failure and overturning failure.

Page 5 of 14 | Total Record : 139

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