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PENGARUH VARIASI SUHU SIKLUS THERMAL TERHADAP KEKUATAN BENDING KOMPOSIT UNSATURATED POLYESTER SERAT KELAPA SEMBADA, IQBAL VARIAN; Hermawan, Yuni; listyadi S, Digdo; Sholahudin, Imam; Kristianta, FX
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Composite is one of the materials used in engineering field. This is because composites have strong properties, light weight, corrosion resistance, economical and so on. One of coconut fiber composite composite. Coco fiber in Indonesia is still not utilized to the maximum to increase its economic value. One application of coconut fiber composite usage is for wood replacement wall. This study aims to determine the effect of repeated thermal load on the bending strength of the composite. In this research the material used is coconut fiber coir random orientation direction as reinforced and unsaturated polyester as matrix with fiber volume fraction 5%. The production method used is press hand lay up. Temperature variations are 30oC, 50oC, 70oC, and 90oC with 10 repetitions. Bending test is done with ASTM D790 standard reference. The result of this research shows the highest bending strength in composite with thermal temperature of 30o C equal to 39,68 MPa. While the lowest bending strength occurred at 90°C thermal temperature of 24.60 MPa. From result of research indicate that unsaturated polyester when given heat load continuously will decrease bending strength because debonding failure in matrix.

IMPLEMENTASI METODE TOTAL PRODUCTIVE MAINTENANCE (TPM) DALAM MENENTUKAN EFEKTIFITAS STASIUN PENGGILINGAN TEBU Ghaffar, Jakfat Maulid; Arbiantara, Hari; Mulyadi, Santoso; Sanata, Andi; Djumhariyanto, Dwi
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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The milling station is a station where sugar cane-based sugar is produced, readiness is needed especially from the point of view of equipment maintenance in order to support the production process. Total Productive Maintenance (TPM) is one method of maintenance approach with Overall Equipment Effectiveness (OEE) is one of the measuring tools in calculating the effectiveness of equipment. Failure Mode and Effect Analysis (FMEA) is one method in analyzing the cause and effect of each device so that later it is hoped that this research can determine the value of the effectiveness of the equipment and provide recommendations for improvements. The calculation of the effectiveness of the equipment at the milling station that the effectiveness values from 2013 to 2017 are 75.87%, 84.17%, 87.58%, 61.53% and 92.59%. In 2013, 2014 and 2016 showed that the value of effectiveness is still below the standards of world class effectiveness values. Factors that influence the effectiveness of 2013 to 2017 are Reduce Speed Losses and Set-up adjustments time. Improvement of recommendations according to the TPM pillar in increasing productivity is 5S (Seiri, Seiso, Seiton, Seiketsu, and Setsuke). Keyword: Total Productive Maintenance (TPM), Overall Equipment Effectiveness (OEE), Failure Mode and Effect Analysis (FMEA).

SIMULASI NUMERIK HAMBATAN DAN POLA ALIRAN BARGE MENGGUNAKAN METODE CFD Prameswari, Grandys; Puspita, Hery Indria Dwi; Sakinah, Wazirotus; ., Rudianto; Arianto, Pratama Yuli
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Barge is a ship that does not have a propulsion and must be towed by a tugboat to sail Therefore, the barge is pulled by a tugboat to sail. This causes the stern area of the barge to be installed with a skeg to support the ship's performance while sailing. One of the performance parameters is the resistance and flow pattern of the barge. Previous research recommended a straight longitudinal skeg at the stern of the barge. This paper continues the recommendation by applying a numerical simulation using the Computational Fluid Dynamics (CFD) method to predict the resistance and flow pattern of the barge due to the skeg used. The CFD method was chosen because of being able to provide accurate, fast, and optimal results. By knowing the resistance and flow pattern values, the results of this study can be used to calculate the amount of bollard pull required by the barge to be towed by the tugboat. The results obtained in this study are the highest resistance at 7 knots of 269.952 kN and the lowest resistance occurs at 4 knots of 89.206 kN. The flow pattern formed in the barge area can be concluded that turbulence mostly occurs in the stern area of the ship due to the interaction of wake, water flow and skeg position. Keywords: Barge, Skeg, Resistance, Flow Pattern

PENGARUH VARIASI BARREL TEMPERATURE, INJECTION PRESSURE DAN COOLING TIME TERHADAP CACAT WARPAGE PADA PROSES INJECTION MOLDING (AL-PP) Saputra, Dheo Ardi Nugraha; Sutjahjono, Hary; Yudistiro, Danang; Rozy H, M Fahrur; Noor HS, Skriptyan
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Plastic is a polymer that has unique and extraordinary characteristic properties. With a binder (plastic) can be combined with metal elements, namely aluminum. Aluminum is chosen as an alloy material because it has good strength and tenacity. Metal alloy plastic can be processed by a method called injection molding. Injection molding is a process used in making plastic products. This research was conducted with barrel temperature, injection pressure and cooling time process variables. While the response variable is warpage defects. This study aims to determine the effect of variations in process parameters is barrel temperature, injection pressure, cooling time on warpage defects in injection molding products with Al-PP alloy material, and find out the optimum variation of parameters in the injection molding process. The results showed that barrel temperature had an effect of 91.62% on the value of warpage defect response, this condition can be observed as the level barrel temperature increases, the value of warpage defects also increases. The effect of 6.43% injection pressure on the value of warpage defects due to an increase in each injection pressure level will reduce the chance of warpage defects. The effect of cooling time parameters is 1.78% on the value of warpage defects, which means that the longer the cooling time, the greater the response or warpage produced. The optimum variation of parameters in the injection molding process in the ASTM A370 test specimen in barrel temperature parameters at level 1 is 150 oC, the injection pressure parameter at level 3 is 11 bar and the cooling time parameter at level 1 is 15 seconds.

Analisis Performa Mesin Pengayak Pasir Zeolit Jenis Rotary Dengan Variasi Sudut Kemiringan & Variasi Kecepatan Putaran Wildan, Muhammad; Hermawan, Yuni; Nashrullah, Muhammad Dimyati; Syuhri, Ahmad; Sidartawan, Robertus; Kristianta, FX
STATOR: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2025): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Pengayakan merupakan proses pengelompokan suatu butiran yang akan dipisahkan menjadisatu atau beberapa kelompok. Salah satu jenis pasir yang membutuhkan sebuah prosespengayakan ialah pasir zeolit. Mesin pengayak pasir dibagi beberapa type salah satunya yaitutype rotary atau berputar. Dalam penelitian ini, akan menciptakan performa terbaik mesinpengayak pasir zeolit type rotary dengan menentukan parameter variasi sudut kemiringan dankecepatan putaran yang tepat pada tabung pengayak. Variasi yang telah ditentukan akanberpengaruh terhadap lama waktu proses pengayakan dan hasil pengayakan pasir zeolit. MetodeTaguchi digunakan untuk mengoptimalkan variasi yang digunakan berupa matriks orthogonalL9 (32). Berdasarkan hasil penelitian ini sudut kemiringan dan kecepatan putaran berpengaruhsignifikan terhadap lama waktu proses pengayakan dan hasil pengayakan pasir zeolit dengannilai persen kontribusi sebesar 17,72% dan 45,18% terhadap lama waktu pengayakaan,sedangkan untuk hasil pengayakan dengan nilai kontribusi 39,33% dan 33,45%. Maka prosespengayakan pasir terbanyak didapat pada variasi sudut 10° dan 28 rpm menghasilkan hasilsaringan pasir halus zeolit 6,70 kg dengan waktu 256,6 sec dan hasil lama waktu pengayakantercepat didapat pada variasi sudut 20° dan 61 rpm menghasilkan waktu pengayakan 198,3 secdengan hasil berat pasir halus 2,67 kg. Sehingga hasil penelitian ini bisa sebagai alternatifpemilihan variasi parameter pada proses pengayakan pasir zeolit menggunakan mesin pengayaktype rotary.Kata Kunci: mesin pengayak, rotary, pasir zeolit, sudut, kecepatan

PENGARUH PARAMETER PEMESINAN BUBUT TERHADAP KEKASARAN PERMUKAAN PADA BAJA AISI 4340 Adha Mahendra, Erlian; Hermawan, Yuni; Triono, Agus; Rozy Hentihu, M. Fahrur; Sakura, Rahma Rei
STATOR: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2025): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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This research evaluates the influence of lathe machining parameters, such as spindle speed,cutting speed, and feed depth, on the surface roughness (Ra) on the wheel axle of an electric car madefrom AISI 4340 steel. Measurements were carried out using a TR220 surface roughness tester machine,which recorded the highest roughness of 10.107 μm and the lowest was 4.041 μm. The results showedthat feed speed contributed 51.24%, spindle speed 35.82%, and cutting depth 12.94% to surfaceroughness.The optimal combination of machining parameters to produce a surface with low roughness is aspindle speed of 770 m/min, a cutting depth of 0.5 mm, and a feed speed of 120 mm/s. Small infeed depths are ideal for producing smooth surfaces, but compromises may be necessary for production efficiency. In addition, high cutting speeds provide optimal results if heat and tool wear can be controlled. Optimizing these parameters is critical to improving product quality, performance and lifetime.Keywords: Surface Roughness, AISI 4340 Steel, Lathe Machining

ANALISIS HAMBATAN PENAMBAHAN STERN FLAP PADA KAPAL PATROLI PENGAWAS PERIKANAN MENGGUNAKAN COMPUTATIONAL FLUID DYNAMIC Aziz, Abdul; Indria Dwi Puspita, Hery; Sakinah, Wazirotus; ., Sumarji; Sutjahjono, Hary; Setiawan, Digdo Listyadi
STATOR: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2025): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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This study aims to analyze the addition of Stern flap to the performance of fisheries surveillance patrol vessels using Computional Fluid Dynamics (CFD). Stern flap is an additional component on the hull installed at the stern of the ship and serves to reduce the resistance that occurs on the ship. The design or simulation used to compile this research is a literature study, with the Computational Fluid Dynamics method using ANSYS Workbench for Student 2023 R2 software simulation. This study discusses the analysis, simulation, and research results related to hydrostatic and aerodynamic resistance on patrol boat models with and without the use of stern flaps at speed variations from 10 knots to 25 knots. The results show that the use of stern flaps increases hydrostatic resistance at low speeds, but can reduce aerodynamic resistance at high speeds. The comparison shows a significant increase in hydrostatic resistance at low speed with the highest value at 10 knots of 54%, while a decrease in aerodynamic resistance occurs at high speed, especially at 25 knots with a decrease of 23%. These results provide important insights in patrol boat design for performance optimization at various operational speeds.

PENGARUH PENGGUNAAN CAIRAN PENDINGIN (DEBIT 75 L/h) TERHADAP EFISIENSI PANEL SURYA MONOCRYSTALLINE 20 WP Hardiatama, Intan; Al Wafi, Adib; Djumhariyanto, Dwi; Ilminafik, Nasrul; Darsin, Mahros; Rudi Sugara, Imam
STATOR: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2025): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Indonesia still relies on the use of energy from non-renewable sources, especially oil and coal. However, the supply of energy from fossil sources is decreasing. The energy conversion process in solar panels causes an increase in temperature, especially in conditions of intense sunlight and hot weather. High temperatures can accelerate the degradation of materials in solar panels. Therefore, a cooling system needs to be developed to lower the temperature of the solar panels to produce electricity efficiently. This study aims to examine how the efficiency of solar panels can be affected by cooling fluids. The experimental method is used by setting the solar panels at an angle of 30°. Data is collected during sunny weather conditions with sunlight levels above 2000 lux. The solar panel used is a 20 WP monocrystalline type. The recorded data includes several parameters, namely current, voltage, light intensity, and solar panel temperature. The results indicated that solar panels with cooling had a lower surface temperature compared to solar panels without cooling. In addition, cooled solar panels have a higher efficiency than uncooled solar panels. Using a cooler with a certain discharge on the surface of a solar panel can increase efficiency significantly. Keywords: Cooling system, Solar Energy, Solar Panel, Efficiency

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Kab. jember,

Jawa timur

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