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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 254 Documents
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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.
Optimization of Injection Pressure and Time of Injection Molding for Eye Drop Heads Ichlasul Insani; Andoko Andoko; Yanuar Rohmat Aji Pradana
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.10022

Abstract

Injection molding is a plastic production process by injecting liquid plastic into a mold. One of the injection molding products is an eye drop head. Eye drops in its production experienced rejects reaching 37.5% due to defects. The purpose of this optimization is to obtain the optimum setting of injection pressure and time of injection molding machine using RSM. The method to achieve the goal through finite element approach with pre-processing includes design and setting boundary conditions for injection pressure (10.5, 11, and 11.5 MPa) and injection time (1.9, 2.0, and 2.1 seconds). Post processing displays the results of product mass, defects, and quality prediction which are further optimized using RSM to obtain optimum values. The simulation results show that higher injection pressure and lower injection time have given satisfactory results for all three parameters (product mass, defects, and quality prediction) observed. Based on the optimization results, the optimal injection molding settings were obtained at an injection pressure of 11.5 MPa and injection time of 1.9 seconds which resulted in a product mass of 0.429 g, weld line defect of 0.1384, and quality prediction of 80.9%.
Analysis of Energy Absorption of Soft Body Armor with Experimental Method and Finite Element Method Using STF (Shear Thickening Fluid) Composite Material Agus Dwi Putra; Dewi Izzatus Tsamroh; Bella Cornelia Tjiptady
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.10248

Abstract

Body armor is personal protective equipment or shield clothing for soldiers that has existed since Roman times until now. The function of body armor is to protect the body from attacks by foreign objects by absorbing energy. Body armor must have ballistic resistance and stabbing resistance, however, body armor that is often found usually has a high anti-ballistic level but is low in receiving stabbing attacks. STF (Shear Thickening Fluid) is a composite material which is unique in that the viscosity level can change in a way that causes the liquid dispersion to become solid and allows for increased stabbing resistance. This research began by making Kevlar samples which were then mixed with STF and then subjected to tensile testing to obtain material properties that were useful for simulating with FEM. The simulation is intended to analyze the rate of energy absorption that occurs in the sample. The results show that the kinetic energy absorption rate of the bullet is absorbed at a viscosity of 87%. The small energy that occurs is also absorbed in the form of frictional resistance with a value of 11.9%. The identified comparison results show that in cases 1-3 the percentage of viscosity is high so it is viscous, whereas in case 4 the direct reflection of the viscosity is low so it is close to liquid.
Fabrication of Dye Sensitized Solar Cell Using Cassava Leaf Extract and Red Dragon Fruit Purnomo, Teguh; Nayan, Ahmad; Sayuthi, Muhammad; Islami, Nurul; Rahman, Abdul
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.10262

Abstract

This research aims to identify the absorbance and consistency of the efficiency of DSSC (Dye-Sensitized Solar Cells). The study was conducted with variations of chlorophyll-anthocyanin mixture using different volumes of dye solutions: 10 ml of a cassava leaf and 20 ml of red dragon fruit, 20 ml of a cassava leaf and 10 ml of red dragon fruit, and 10 ml of a cassava leaf and 10 ml of red dragon fruit. The Dye-Sensitized Solar Cell system consists of natural dye as the colorant, electrolyte solution, two FTO glass substrates with dimensions of 2.5 cm x 2.5 cm, which function as working electrodes coated with titanium dioxide as the semiconductor using the doctor blade method, and counter electrode coated with carbon. All components of the Dye-Sensitized Solar Cell are arranged in a sandwich-like structure, with the counter electrode facing the working electrode and clamped together using paper clips. The highest absorbance value was obtained with the variation of 20 ml red dragon fruit and 10 ml cassava leaf compared to other mixtures. The highest efficiency and power of the Dye-Sensitized Solar Cell were also obtained with 20 ml of red dragon fruit and 10 ml of cassava leaf
Damage Analysis of Grinding Machine Using FMEA and LTA Method at PT. X Hidayah, Asfarina
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.10853

Abstract

PT. X is a company in Banyuwangi, East Java, that produces shrimp feed. PT. X which is engaged in the shrimp feed production process has its own production machine that supports the shrimp feed production process. PT. X is able to carry out the production process from raw materials to finished materials, namely various shrimp feeds. One of the production machines at PT. X is a vertical pulvalizer grinding machine branded yeong-ming.  The objectives of this study are a. Analyze the breakdown of grinding machines using FMEA. b. Determine and categorize damage priorities using LTA. The method used in this study is the FMEA Method is carried out to identify grinding machine spare parts that are often damaged or aim to find out critical spare parts, with the FMEA table producing RPN values to rank the level of damage to grinding machine spare parts . There are 11 failures or failure modes obtained from grinding machine spare parts. Based on FMEA calculations, there is the highest RPN with a value of 108 resulting from the types of spare parts block C6 and block C7 with a failure cause of surface wear. These problems include failures in the operating process, where spare parts block C6 and block C7 function to smooth raw materials, where spare parts rub all the time with raw materials. Analysis using the LTA method on 11 causes of damage, there are 6 that are included in the category of outage problems (B), there are 4 that are included in the category of hidden failure (D) and outage problems (B) and there are 1 that are included in the category of safety problems (A) and outage problems (B).
Balancing and Alignment Analysis of Vertical Wind Turbine Helix Type and Savonius Type Finali, Asmar; Wardhana, Prabuditya Bhisma Wisnu; Utomo, Rochmad Eko Prasetyaning; Yudha, I Gusti Ngurah Agung Satria Prasetya Dharma
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.9654

Abstract

Electrical energy is one of the basic needs that is very important in life, in addition to the physiological development of living things, electricity is also an input for various efforts or activities in order to produce something for survival. Therefore, renewable energy that is more environmentally friendly and an inexhaustible source of energy is needed, namely wind energy. This power generator is called a wind turbine with a vertical shaft. This turbine converts wind energy into mechanical and electrical. In order to obtain a turbine design with high efficiency.  It is also necessary to balance and align each component frame attached to the turbine rotor to produce a perfect/ideal rotation, so as to minimize the occurrence of vibrations caused by the imbalance. the results of calculations with the analytical method on Darrius Helix type obtained value = 0.125 Newton, and = 0.175 Newton, and the value of the angle = 63.43490. Alignment testing is carried out to determine the value of the misalignment between one blade with another blade. The results of the balancing test with the blade ballast obtained additional value, the blade D was 70 grams and the results from the plate addition test were obtained according to the calculation of the analytical method but also less than the maximum requiring additional load on the blade body to get blade A = 12 grams, blade B = 0, blade C = 40 grams, and a spoon D = 90 grams. For the results and discussion of the balancing and alignment method on the savonius type using the static balancing and alignment method using a dial indicator, the values obtained are in the fields A and B, the addition of mass is 59,007 grams and 59.007 grams with angles A and B 11.88 ° , and the value The misalignment deviation in the A, B and center planes is A: 4mm, B: 0.04mm, middle: 0.52mm, while the shaft alignment value is 0 because the value of the alignment of the shafts is the same or parallel.
Optimization of Melt and Coolant Temperature on Defects of Injection Molded Toothbrush Handle Mochammad Arief Susetyo; Andoko Andoko; Yanuar Rohmat Aji Pradana
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.10021

Abstract

The toothbrush handle is an injection molded product that rejects up to 10%. One of the factors that cause defects is the injection molding process settings, namely melting and cooling temperature. The purpose of this optimization is to obtain the optimum value of melt and cooling temperature parameters on product quality (minimum defects) of toothbrush handles using RSM. The methods used include simulation using ANSYS to obtain mold temperature, Autodesk Moldflow to obtain product defects and quality prediction based on input parameters of melt temperature (190o , 200o , and 210o C) and coolant temperature (22o , 24o , and 26o C), and Minitab 19 for RSM optimization. The simulation results that cooling temperature and melt temperature that are too low and high result in high defect values (weld line and shrinkage) in the product, resulting in low quality prediction values. Based on the results of the optimized simulation, the best injection molding setting is at a melt temperature of 200oC and a cooling temperature of 24oC which obtains a toothbrush handle product quality response variable of 78.04% with a minimum weld line value of 0.0277o and a minimum shrinkage depth of 0.009 mm.
Optimization of Iron Oxide (Fe2O3) Addition Parameters on the Physical Properties of Al-Si Alloys as an Advanced Material Innovation Yazirin, Cepi; Marlina, Ena; Tsamroh, Dewi Izzatus
TRANSMISI Vol. 20 No. 2 (2024): September (2024)
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v20i2.13908

Abstract

Aluminum-silicon alloys are widely used in the industrial world, one of which is because they have high wear resistance. The aim of this research is to determine the physical and mechanical properties of the Al-Si alloy after strengthening by mixing reinforcing materials. The research method uses Taguchi optimization and analysis of the physical properties of the Al-Si alloy test results. The results showed that the highest hardness value was obtained in the 7th experiment, namely with a rotation variation of 2000 rpm, temperature of 6000C, and holding time of 60 seconds. This result is in line with the results of the tensile strength test, where the highest tensile strength was also obtained in the 7th experiment. This result is supported by the results of other researchers, which show that the higher the rotation in the casting results in higher hardness. The results of the microphotographs show that all alloy materials have an even distribution of grains, the grain size appears small, and the dendrites in the raw Al-Si alloy appear small compared to other materials. The macro photo results show that all alloy materials have fractures that appear brittle, as evidenced by the fact that these fractures provide light reflection.
The Effect of Depth of Cut and Spindle Speed on Cutting Parallelism Results on Aluminum 6061 CNC TU-3A Retrofit Machine Santosa, Salindra Sakti Putra; Mashudi, Imam
TRANSMISI Vol 20, No 2 (2024): September (2024)
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v20i2.13726

Abstract

Machining process is an important part of manufacturing to form and finish high-precision components. Milling is a commonly used technique, and the advancement of CNC technology has enabled precise and consistent production. This study evaluated the effect of spindle speed and depth of cut on the surface parallelism (µm) of aluminum 6061 using a TU-3A retrofit CNC milling machine. A quantitative experimental method with factorial design of experiments (DOE) was applied, testing spindle speeds of 600 RPM, 800 RPM, and 1000 RPM and depths of cut of 1.0 mm, 1.5 mm, and 2.0 mm, while maintaining constant feed rates of 48 mm/min, 64 mm/min, and 80 mm/min. The results showed that spindle speed had no significant impact on surface parallelism (µm) (P-value = 0.924), although higher speeds showed a trend of better results. In contrast, depth of cut significantly affects parallelism (µm) (P-value = 0.000), with greater depth improving surface quality (µm). In addition, the interaction between spindle speed and depth of cut is also significant (P-value = 0.002), indicating that the combination of higher spindle speed with lower depth of cut produces better results. These findings suggest optimal machining parameters to improve surface parallelism (µm) in aluminum milling operations.

Page 24 of 26 | Total Record : 254

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