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Published by Universitas Merdeka Malang
ISSN : 02163233     EISSN : 25802283     DOI : -
Core Subject : Engineering,
Automotive Engineering Control & Systems Engineering
Jurnal TRANSMISI dipublikasikan oleh Jurusan Teknik Mesin Universitas Merdeka Malang sebagai media diseminasi hasil penelitian dan karya ilmiah baik penelitian dasar maupun terapan di bidang teknik mesin. Berkala ilmiah ini memuat naskah dengan bidang kompetensi konversi energi, material (metalurgi), produksi dan manufaktur baik merupakan penelitian dasar ataupun rekayasa alat terapan.
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Articles 8 Documents
 1 
Search results for , issue "Vol 19, No 1 (2023): March 2023" : 8 Documents clear
Investigation of Thermophysical and Rheological Properties of Scallop Shell Powder/SAE 5w-30 Nanolubricant Purwanto, Muhammad Rizky; Puspitasari, Poppy; Permanasari, Avita Ayu; Abdullah, Muhammad Ilman Hakimi Chua
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9638

Abstract

Nanolubricant is a type of nano fluid that contains base-fluid lubricant (water or oil) and nanoparticles. This study aims to analyze the thermophysical and rheological properties of lubricants with the addition of nanoparticles. The nanoparticles used are Calcium Carbonate (CaCO3) made from scallop shell waste. The base lubricant is SAE 5W-30 synthetic oil which has quite good performance. Synthesis of Calcium Carbonate (CaCO3) into SAE 5W-30 lubricant uses a two-step method. Variations in the addition of volume fraction of Calcium Carbonate (CaCO3) of 0.05%, 0.10%, 0.15%. Furthermore, the nanolubricant was tested for its thermophysical properties which included thermal conductivity, specific heat, density, viscosity, and sedimentation. After that, the rheology of the nanolubricant can be known from the viscosity data by calculating the shear rate and shear stress.
Identification of Thermophysical and Rheological Properties of SAE 5w-30 with Addition of Hexagonal Boron Nitride Reyhandi Katon Asmoro; Poppy Puspitasari; Avita Ayu Permanasari; Muhammad Ilman Hakimi Chua Abdullah
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9639

Abstract

This research uses SAE 5W-30 lubricant base material with the addition of Hexagonal Boron Nitride (hBN) nanoparticle additives. This study aims to analyze the thermophysical and rheological properties of lubricants with the addition of nanoparticles. The method in this study uses a two-step method where nanoparticles are first prepared separately, then added with nanoparticles with varying volume fractions of 0.05%, 0.10%, 0.15% into the base fluid as a processing step. The next step is the stirring process using a magnetic stirrer, and ultrasonic homogenizer process.  Furthermore, the nanolubricant was tested for thermophysical properties including viscosity, density, thermal conductivity, and sedimentation.
Mechanical Properties of Composites Combination of Areca Fronds with Epoxy Resin Joni Joni; Enos Tambing
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9618

Abstract

Technological advances in material aspects are always increasing, and one of the applications of natural fibers as a matrix in composite materials has begun to be widely used. Composite materials have mechanical properties that are sturdy, corrosion resistant, and concise, and can be used as a substitute for metal materials. Areca palm fronds are part of the areca palm tree which are widely used as storage media because they are durable and weather resistant. The aim of this study was to determine the tensile strength of areca nut composites without alkali treatment combined with epoxy. Tensile test based on ASTM D3039 test standard. The test results showed a maximum tensile strength of 4839886.67 N/m2 or 4.84 MPa, and a modulus of elasticity of 114148270.5 N/m2 or 114.15 MPa. According to the JIS A 5905 standard, it meets the specified requirements, namely elastic strength of 32 MPa and tensile strength of 0.4 MPa.
Crack Simulation on Diesel Engine Crankshaft using Finite Element Method Pradhana Kurniawan; Yusuf Prasetyo Gemilang
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9800

Abstract

Crankshaft is a machine component that has a high stress value and failure usually occurs due to fatigue. Crankshaft in diesel engines found in certain vehicles that have performance specifications of 140 cv (cheveaux vapeur) at engine speed of 4000 rpm and displacement of 1963m3. Crankshaft failed on the crankpin and main bearing cap. The failure occurred after this vehicle traveled 180,000 km in use and through repairs during 8 years of use. Failure of the crankshaft is the root cause of internal damage to the combustion engine. Based on a simulation on a 4-cylinder diesel engine crankshaft using the finite element method using ANSYS Workbench 18.1 software, the equivalent (von mises) stress results are obtained with a maximum stress value of 445.72 MPa. Stress concentrations present in the crankshaft will result in the initiation of cracks which can propagate and result in fracture of the crankshaft. The stress concentration lies in the fillet web of the crankshaft where this part is very susceptible to cracking and fracture if the fillet design is not suitable or if an error occurs when the crankshaft is in the initial machining process. Stress concentrations at a certain point can also be caused by errors during the fabrication process.
Morphology Study of the Corrosion Rate on Weld Joint of Double Side Friction Stir Welding Aluminum Alloy AA6061 Simonne Andrean Crisdion; Poppy Puspitasari; Avita Ayu Permanasari; Danang Priyasudana; Diki Dwi Pramono; Majid Niaz Akhtar
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9636

Abstract

DSFSW welding uses the rotating of a tool in the workpiece to create heat owing to friction between workpiece and tool to be connected. Corrosion is influenced by the presence of high heat owing to friction and a non-uniform cooling rate. The heat transforms the metal in the Heat Affected Zone (HAZ) and Weld Metal (WM) region, which can result in flaws such porosity, kissing bond, fractures, voids (from welding penetration), and flash as well as changes to the microstructure. Changes in the microstructure of welded joints can affect the resistance of welded joints to corrosion. The purpose of this study is to experimentally analyze the main causes of failure of AA6061 DSFSW joints based on welding temperature, weld defects, microstructure, corrosion rate and morphology of the corroded surface. Temperature testing using thermocouple to analyze the temperature, welding joint defects using DSLR camera and radiography test, microstructure using optical microscope, corrosion rate using AUTOLAB PGSTAT and morphology of corroded surface using SEM. The temperature analysis results show that the advancing side has a higher temperature than the retreating side, due to friction between the tool and base metal accompanied by the opposite welding direction. Visual inspection shows that all specimens and welding positions produce flash that is quite rough on the top (1G) and bottom (4G) surfaces and radiographic test results show incomplete fusion in 4 specimens. Microstructure shows a change in shape and size resulting in recrystallization in the form of fine grains. The highest corrosion rate is found in specimen B 1G welding position of 0.63856mm/year and the lowest corrosion rate in specimen A of 0.058567mm/year. SEM test results show the type of corrosion that occurs in DSFSW welding joints is pitting corrosion.
Effect of Cathode Distance, Anode and Electroplating Time on Aluminum Alloy Corrosion Rate Agus Dwi Putra; Dewi Izzatus Tsamroh; Yayi Febdia Pradani; Ratna Fajarwati Meditama; Ahmad Muflih
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9572

Abstract

Aluminum foil is used more often than actual aluminum in everyday life because aluminum is actually quite unstable and is not suitable for securing heavy containing objects. For car wheels, aluminum is mixed with manganese and then hardened to withstand the load. Using aluminum alloys requires an electroplating process to increase corrosion resistance, decorative value and friction resistance. The purpose of this study was to determine the properties of anodized cathode aluminum alloy and the required coating time. In this study, a quantitative experiment used 20 samples. The results showed that there were defects in the aluminum alloy lattice, but not too significant. Different corrosion rate values were shown using electrolysis periods of 30 minutes and 60 minutes combined with anode-cathode distances of 5 cm, 10 cm and 15 cm. The group with 30 minutes of coating time and 5 cm anode-cathode distance had the highest corrosion rate (0.853 mm/year), while the group with 30 minutes of coating time and 10 cm anode-cathode distance had the lowest corrosion rate (0.610). The group with 60 minutes of coating time and 10 cm distance between the anode and cathode had the highest corrosion rate of 1,564 mm/year, while the group with 60 minutes of coating time and 15 cm distance had the lowest corrosion rate. The anode-cathode distance partially affects the corrosion rate of aluminum alloy electroplating. The smaller the distance between the anode and cathode, the higher the corrosion rate of the aluminum alloy. The longer the coating lasts, the higher the corrosive rate of the Al alloy.
The Lean Project Approach to Anticipate Delays in the Construction of 3.5 GT Fishing Boats (Case Study at PT. X) Hidayah, Asfarina
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9635

Abstract

Projects generally have a deadline for completion. So far, PT. X often experiences delays in project completion. The problem is that waste often occurs in the production process. As a result, the company can suffer losses if waste m is not minimized immediately. The purpose of this research is to identify waste that contributes to delays in the construction of 3.5 GT fishing vessels and to increase the Value Stream by using the Lean Project methodology to estimate delays. Utilizing the Lean Project methodology, this research identifies and maps waste in every manufacturing step.The recommended value stream creation is based on the total time spent on each component, which is calculated from 18.7 hours to prepare the mould, 26.5 hours to manufacture the hull, 28 hours to assemble, 112 hours to manufacture the steering system, and 88 hours to manufacture the finish. The initial value stream for one unit of the Sumbawa 3.5 GT fishing vessel is 273 hours, or 34 days, according to the estimated time for each stage of the production process. The planned lead time is 678 hours or 84 days less than the previous lead time. The difference from the anticipated value stream is 405 hours or 51 days.   
Evaluation of Fluid Flow Velocity Variations on the Plate Heat Exchanger Performance Andika Syahputra; Asnawi Asnawi; Ahmad Nayan; Alchalil Alchalil; Nurul Islami
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9650

Abstract

Heat exchanger expected to high effectiveness of heat transfer. Type of plate heat exchanger was more efficient compare to another heat exchangers in industrial applications with pressure less than 30 bar. The increased velocity of cold fluid flow has an impact to increase the performance of heat exchanger by  heat transfer rate (Q), heat transfer coefficient (U), and the effectiveness of heat exchanger (ε). The increased velocity of cold fluid flow also incresing the heat transfer rate. The study carried out by variation of the cold fluid velocity at 0.03 m/s, 0.037 m/s, 0.045 m/s, 0.051 m/s and 0.059 m/s. Inlet hot fluid temperature (Th,i) at 45°C and cold fluid temperature (Tc,i) at 27°C constant. The results shows Q value from the original 1570.71 Watt to 1916.16 Watt on the hot side and 1751.89 Watt to 2187.01 Watt on the cold side. The U value from the original 1180.46 W/m2.°C becomes 1408,75 W/m2. °C. The ε value increased from 60.33% to 75.69%. The increasing of  cold fluid velocity directly proportional to the the heat transfer rate (Q) and performance of the plate heat exchanger. This Phenomenon due to the faster circulation of the cold fluid, which causes the cold fluid to quickly return to its initial temperature (Th,i), an than increasing the plate heat exchanger's performance.

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