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INDONESIA
AUSTENIT
Published by Politeknik Negeri Sriwijaya
ISSN : 20851286     EISSN : 26227649     DOI : https://doi.org/10.53893/austenit
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
AUSTENIT (pISSN 2085-1286 and eISSN 2622-7649) is a peer-reviewed open access journal published by Mechanical Engineering Department, Politeknik Negeri Sriwijaya. Focused on original articles in the form of technical and vocational research results or literature review which provides insight in the field of mechanical engineering and machinery that includes Mechanical Structure, Manufacturing, Metallurgy Sciences and Engineering, Design Engineering, Maintenance and Repair Engineering, Fluid Dynamics, HVAC (Heating, Ventilation and Air Conditioning), Heat-Mass Transfer, Sustainable Renewable Energy, Mechatronic and Control Systems or as well as other related Mechanical Engineering field study.
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Articles 227 Documents
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PERFORMANCE ANALYSIS OF BIO-BRIQUETTING MACHINE WITH SCREW EXTRUDER TYPE BASED ON QUALITY OF BIO-BRIQUETTES Puspa, Dilia; Yerizam, Muhammad; Zamheri, Ahmad; Wardhana, Agum Try
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT: October 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i2.7218

Abstract

he purpose of this study is to design a bio-briquetting machine with screw extruder type to convert biomass into higher density based on quality standard of charcoal briquette SNI 01-6235-2000 and SNI 19-4791-1998. The machine had production capacity of 30 kg/hour, equipped with the motor of 1 HP which transmitted to the machine through pulley and belt, and also has cutter which rotates continuously. The raw materials of the bio-briquette were using bagasse and coconut shells. There are 6 parameters that are used to test the quality of bio-briquette such as calorific value, inherent moisture, ash content, dependability pressure, volatile matter content, and fixed carbon content. The bio-briquette was made from the raw materials using amylum adhesives with ratio 30:70:30. With feed as 5 kg, the machine produced 50 pieces of bio-briquette. The machine could produce good bio-briquettes such as calorific value of 6,511.3 cal/g, inherent moisture of 1.97%, ash content of 5.88%, volatile matter of 27.71%, fixed carbon content of 64.99% and compressive strength was 16.98 kg/cm2.
ANALYSIS OF PARALLEL COUPLING OF CHLOR-ALKALI AND ALKALINE WATER ELECTROLYSIS PROCESS WITH COMBINE CATHODE FLUID CIRCULATION Pratama, Andri; Sipahutar, Riman; Bizzy, Irwin
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT: October 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i2.7517

Abstract

Hydrogen is almost ideal fuel in reducing emissions without CO, CO2, SOX or NOX. Hydrogen can be used through the combustion or Fuel Cell processes so that emissions are low. One of the hydrogen production processes is through electrolysis, both Chlor-Alkali (CA) and Alkaline Water Electrolysis (AWE). Both processes contained a NaOH solution in the CA and catalyst results in AWE. In this test, a combination of CA and AWE processes will be carried out in the fluid circulation at the cathode of two processes. From this study it was found that there was an increase of 11 percent by weight of gas when CA and AWE cathode fluid were circulated in parallel compared to the CA and AWE processes respectively.
BIOCOMPATIBLE P(TM co SA-CAA) HYDROGELS WITH pH RESPONSIVE AND ENHANCED MECHANICAL PERFORMANCE Gustini, Gustini; Kaprawi, Kaprawi; Basri, Hasan; Irmawan, Irmawan; Yani, Irsyadi; Paramita Eka Utami, Nurhabibah
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT: October 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i2.7536

Abstract

In recent years, development of hydrogel that combines biocompatibility, pH responsive and mechanical performance has attracted the attention of researchers. A novel biocompatible hydrogel, composed of P(TM co SA) and P(TM co CAA) was synthesized by a simple admixture and heating process. The results show that with increasing levels of SA-CAA monomer concentration, an increase in tensile strength and elongation at breakpoint was observed and optimal at the ratios P(TM co SA CAA). Tensile strenght and young’s modulus registered an impressive increase of 43% and 40% respectively. These improvements are attributed to strong synergistic hydrogen bonding interactions between the TM and SA-CAA chains. During the experiment, maximum increase in weight was also achieved at pH 10 NaOH solution, it is show the pH-responsive hydrogels. The investigation of P(TM co SA-CAA) hydrogel mechanism showed that more homogenous dispersed through crosslinks dominated by β-sheets from Amide I structures. Furthermore, the SA-CAA molecules contributed to the biocompatibility, pH responsive and mechanical performance of P(TM co SA-CAA) hydrogels. Conclusively, its P(TM co SA-CAA) hydrogels clearly demonstrated the relevance of the provide a bioresponsive material for biomedical applications, such as tissue engineering, regenerative medicine and pH-sensitive drug delivery.
RANCANG BANGUN SISTEM PENDINGIN DAN PENCUCI PADA MESIN PENGOLAH BIODIESEL DENGAN BAHAN BAKU MINYAK JELANTAH Rahmawaty, Made; Fauzan, Muhammad Hilmy; Hendriko, Hendriko
AUSTENIT Vol. 16 No. 1 (2024): AUSTENIT: April 2024
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v16i1.6774

Abstract

There are three stages for processing biodiesel-based used cooking oil: the esterification process, cooling and purifying FAME, and filtration of crude biodiesel. The time required for purifying FAME is about two until six hours because it has to follow the sedimentation process several times. Therefore, this research developed a biodiesel purification machine equipped with a cooling system. The cooling system aims to make the sedimentation process faster. The cooling system uses a thermoelectric module attached to a pipeline from the esterification tank to a purification tank. This machine is also equipped with a control system and valve driven by motor to perform the process automatically. The design of the biodiesel purification machine has been successfully developed and has followed a series of tests. The test results on the accuracy of flowmeters show that they work correctly. The application of a cooling system is proven to reduce the sedimentation process time to 20 minutes, which in turn shortens the time for the biodiesel purification process, which in turn shortens the time of the biodiesel purification process. In addition, the control system allows the machine to operate automatically, thereby reducing the operator's need significantly.
KARAKTERISTIK PERMUKAAN PATAH DAN KETAHANAN LELAH PADA MATERIAL BEJANA TEKAN BAJA ASTM A36 Azhari, Ikbal; Chandra, Hendri; Homzah, Ozkar F.; Ramadhoni, Tri Satya; Sampurno, Rachmat Dwi
AUSTENIT Vol. 16 No. 1 (2024): AUSTENIT: April 2024
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v16i1.7219

Abstract

Pressure vessels are equipment in the industrial field to hold pressurized fluids, such as gas, oil and chemicals, ASTM A36 steel is one type of material that can be used in pressure vessels, this steel has good mechanical properties but still has limitations in its fatigue resistance. Pressure vessels receive internal and external loads, this pressure difference results in stress on the wall (shell). This stress can cause material damage, therefore the author conducted fatigue repeated bending and Scanning electron microscopy (SEM) testing to analyze fatigue resistance and fracture surface characteristics. Fatigue testing of 4 specimens with angle variations of 4Ëš, 8Ëš, 11Ëš and 13Ëš resulted in a cycle count of 1490200 cycles, 400050 cycles, 234200 cycles and 99000 cycles respectively. SEM results of the fracture surface of the 4Ëš and 13Ëš testing angles of ASTM A36 steel showed striation and microvoid coalescence and crack propagation indicating that the fatigue failure that occurred was ductile fracture. Based on the conclusions obtained, it shows that the number of cycles is influenced by the testing stress, which means that at high stresses, the life time of the pressure vessel will be smaller and vice versa.
ANALISIS PENGARUH SURFACE ROUGHNESS, TEMPERATUR SUBSTRAT, DAN JENIS MATERIAL ABRASIVE TERHADAP BIAYA PROSES MENGGUNAKAN METODE TAGUCHI Rachman, Farizi; Mutiara, Arun Sukma; Indrawan, Rizal; Setiawan, Tri Andi; Bisono, Fipka; Purnomo, Dhika Aditya; Hamzah, Fais
AUSTENIT Vol. 16 No. 1 (2024): AUSTENIT: April 2024
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v16i1.7389

Abstract

The wrapping up and portray fabricating handle may be a organize of venture work at PT. Lintech Duta Pratama. Disgraceful portray forms result in absconds. Items that have absconds require repair so they can at that point be sent to clients. Rehashed repair forms cause expanded handle costs and obstruct item conveyance. In this manner, to get great item quality and diminish handle costs, inquire about to obtain ideal parameter settings is required. The method parameters considered are surface harshness, substrate temperature, and sort of abrasive fabric. The experimental design used is the taguchi method in the form of an orthogonal matrix . From the exploratory comes about, the ideal combination of handle parameters for prepare costs was gotten, to be specific surface harshness at level 1 with a esteem of 50 μm, temperature at level 2 with a esteem of 34 ° C, and rough fabric sort at level 2 with steel coarseness.
OPTIMALISASI DESIGN SAMBUNGAN ALUMINIUM EXTRUSION 2020 MENGGUNAKAN METODE FINITE ELEMENT ANALYSIS (FEA) Sani, Almadora Anwar; Gunawan, Indra; Fernandes, Yogi Eka; Suryana, Didi; Nugraha, Agus
AUSTENIT Vol. 16 No. 1 (2024): AUSTENIT: April 2024
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v16i1.7572

Abstract

With the rapid development of technology, the need for innovation is also increasing. One of the most popular technologies today is 3D printers. However, to produce quality 3D prints, a good frame structure is essential. The most important part in 3D printing is the frame structure. The most crucial part in the 3D printing process is the frame structure, namely Core XY. This is very crucial because the frame structure of the Core XY 3D printer has a big influence on the load it will accommodate in supporting the overall 3D printing process. The material used in this research is 6061 aluminum with extrusion profile 2020. This research focuses on analyzing the strength and balance of the structure, as well as the strength of the joints on the Core XY 3D printer due to static loading. To achieve this goal, researchers used the finite element analysis method using Ansys 2021 R1 software to obtain an optimal simulation. The tests used by researchers were carried out by determining the static free value that occurs in the Core XY 3D printer frame. The structural analysis results show the maximum deflection value δmax = 0.25635mm, maximum yield stress εymax = 42.169 MPa, and maximum yield strain σymax = 6.1417e-004mm/mm. Researchers can conclude that the Core XY 3D printer is feasible to use to be able to produce 3D object prints.
OPTIMIZATION ROUGHNESS LEVEL OF TURNING FROM ALUMINUM SCRAP SMELTING RESULT USING SAND CASTING METHOD Gunawan, Indra; Muarif, M. Awal; Fadilah, Muhammad Arif; Sani, Almadora Anwar; Sampurno, Rachmat Dwi; Apandi, Khairul; Achva, RA. Jihan Ulima; Ayuni, Riski
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT: October 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i2.7590

Abstract

The Production Machinery Workshop at the Sriwijaya State Polytechnic are producing a lot of aluminum scrap left over from turning, where this waste is still thrown away. This will cause pollution to the environment and will be detrimental to the Sriwijaya State Polytechnic workshop. Casting is one way to deal with aluminum scrap, scrap be melted and then reshaped into a practical material that can be reused. The use of sand as a printing medium in recycling scrolls is not recommended because it is less effective and efficient in terms of long-term use. After research has been carried out, the resulting aluminum shaving waste can be reused as practical material provided that the shavings must be separated from other waste such as iron and steel. In the optimization process, the best value is obtained at the spindle speed factor of 900 rpm (A1), then the feeding depth at 0.5 mm (B1), and the feeding speed at 0.08 mm/put.  
DESIGN OF BAJAKAH ROOT CHOPPING MACHINE INTO TEA POWDER Abdi, Muhammad Zainul; Saparin, Saparin; Setiawan, Yudi; Wijianti, Eka Sari
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT: October 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i2.8093

Abstract

Tea (camellia sinensis) is one type of plant that is often found as a processed beverage. There are several raw materials for making tea that are often used including using leaves, shoots, flowers, and roots. One of the teas made from roots is bajakah root tea where the manufacturing process is still done in the traditional way, namely chopped using a machete. Therefore, in this study, a bajakah root chopping machine was designed with the aim of helping the bajakah root production process into tea powder. This bajakah root chopping machine into tea powder is designed using the France method with the demands of a sturdy frame and easy to move. This bajakah root chopping machine has dimensions of 340 mm long, 240 mm wide and 600 mm high. The engine is driven by an electric motor with a power of 0.5 Hp, a rotation of 1400 rpm using a pulley drive system with a ratio of 1: 1.5 and the rotation of the chopper shaft is 933 rpm. From the test results taken from a sample of 500 grams of raw material with 3 times testing, the resulting average is perfectly chopped as much as 389 grams, not perfectly chopped as much as 54 grams, with a time of 167.3 seconds. The production capacity of the machine is 8.37 kg/hour.  The machine that has been made is able to chop bajakah roots with a machine production efficiency of 77.8%.
RANCANG BANGUN MESIN PENGGEMBUR TANAH MENGGUNAKAN MATA BAJAK TIPE CANGKUL DENGAN KEMIRINGAN SUDUT 110° Filgantara, Yuda; Saparin, Saparin; Setiawan, Yudi; Wijianti, Eka Sari; Ariksa, Jeri
AUSTENIT Vol. 16 No. 1 (2024): AUSTENIT: April 2024
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v16i1.8110

Abstract

Indonesia is an agricultural country where the majority of the population is farming. Farmers in Indonesia still use many traditional methods in processing agricultural land such as using hoes. In previous studies, a soil bulking machine was made with a slope of the plow blade angle of 90 ° and obtained less than optimal loose results. The influencing factor is that the angle of the hoe eye is not large, therefore the manufacture of a soil bulking machine is carried out using a hoe-shaped plow with the slope of the corner of the hoe eye enlarged to 110 °. The soil bulking machine uses 30 hoe-shaped plowshares with a hoe blade height of 10 cm, a width of 10 cm and a hoe tip thickness of 6 mm. The type of soil that can be plowed by this soil bulking machine is soil that has been cultivated on agricultural land. The test was conducted on an area of 28 m2. In the first experiment, it took an average of 18.78 seconds with an average pirated depth of 9.76 cm. In the second experiment, it took an average of 16.91 seconds with an average pirated depth of 9.30 cm. In the third experiment, it took an average of 19.24 seconds with an average pirated depth of 11.26 cm. The result of soil loosening with an average productivity of 1.53 m2 / second with an average depth of 10.10 cm.

Page 21 of 23 | Total Record : 227

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