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Sprocket : Journal of Mechanical Engineering
Published by Universitas HKBP Nommensen
ISSN : -     EISSN : 26858916     DOI : https://doi.org/10.36655/sproket.v1i1
Core Subject : Science, Engineering,
Automotive Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
SPROCKET Journal of Mechanical Engineering (SJoME) adalah jurnal ilmiah yang berisi tentang publikasi hasil karya penelitian, perancangan dan kajian teori di bidang ilmu teknik mesin dan permesinan, meliputi konversi energi, manufakturing, material dan perancangan desain produk. SJoME diterbitkan oleh Program Studi Teknik Mesin Fakultas Teknik, Universitas HKBP Nommensen, Medan Indonesia. SJoME terbit 2 (dua) kali dalam setahun, yaitu pada bulan Februari dan Agustus.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 92 Documents
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Pengujian Kekuatan Tarik Komposit Serat Kayu Mahoni Tanpa Pengaruh Alkali Yanhar, M Rafiq; Siagian, Parulian
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.912

Abstract

Composite is defined as a combination of two types of materials, namely matrix and reinforcement which have different properties. Composites have the advantage that they are resistant to corrosion and also have good strength and stiffness. This study aims to determine the tensile strength of mahogany fiber composites without alkali, with variations in fiber volume of 10%, 30%, 50%, and variations of mesh 30, 50, and 80. The reinforcing particles are made in powder form by means of a blender with a matrix. BQTN 157 EX polyester resin was used. The results showed that the highest tensile strength was found in the mesh 80 experiment of 43.07 MPa. This shows that the smaller the composite reinforcing particles, the greater the tensile strength. While the smallest tensile strength is at 10% fiber volume, namely 14.21 MPa. Tensile strength reaches its maximum at 30% fiber volume, which is 32.76 MPa. The addition of fiber volume to 50% actually lowers the tensile strength to 20.69 MPa.
Korelasi Nilai Hambatan Konus Terhadap Parameter Rembesan Dalam Aplikasinya Pada Dinding Penahan Tanah Saragi, Yetty; Bernandus, Riski; Sidabutar, Ros Anita
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.916

Abstract

Retaining walls are one of the constructions that are often found as slope safety walls which function to withstand lateral forces from the soil behind them. Retaining walls must be able to withstand shear, overturn, bearing capacity and meet the provisions of SNI 8460 2017 Geotechnical Design Requirements. The retaining wall must also be able to withstand water seepage into the soil behind it so it is necessary to know the amount of the seepage coefficient (k). The value of the seepage coefficient (k) can be determined from the Constant Head and Falling Head laboratory tests as well as by using the correlation from the results of the CPT Cone Penetration Test (which was used in this study). The CPT test was carried out at 4 stations that had experienced slope failure. Furthermore, this study designed a retaining wall in the landslide area by taking into account the magnitude of the seepage coefficient (k). From the four CPT points, the seepage coefficient values were obtained k1 = 1.06E-05 cm/sec, k2 = 5.79E-06 cm/sec, k3 = 6.77E-06 cm/sec and k4 = 6.46E-06 cm/sec. Taking into account the presence of water seepage behind the retaining wall, it is obtained that FK 1.65 still does not meet FK under conditions of high levels of uncertainty and large repair costs (FK requirements > 2.0 according to SNI 8460 2017). From this study, it was found that by calculating the seepage coefficient (k), the FK value was not sufficient and it was suggested that in its implementation, efforts to compact the soil layer by layer behind the wall were needed so that the soil behind the wall was quite dense.
Korelasi Hambatan Konus Dengan California Bearing Ratio Lapangan Pada Tanah Lempung Sidabutar, Ros Anita; Saragi, Yetty; Situmorang, Jesika
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.917

Abstract

The bearing capacity of subgrade for pavement thickness planning needs is generally determined by carrying out CBR testing. The BCR test in this study will be carried out by field CBR tests (field CBR) using the results of the DCPT examination. Inspection with the DCPT tool produces soil bearing strength data to a depth of 90 cm below the subgrade. The results of this examination are expressed by the Penetrometer Scale Penetrability (SPP) and the Penetration Resistance Scale (SPR). Road construction, which is certain to continue, requires data on identification of soil types and CBR where such data is not always available. In fact, the correlation between CBR and conical tip resistance (qc) already exists. Rahardjo (1996) suggests that for clay, the correlation between qc and CBR is CBR = 0.5 qc. However, the correlation results come from an unknown area, which of course the soil structure and properties are likely to be different and therefore it is also common to find that the time available to design a road pavement layer foundation is very urgent. Meanwhile, to obtain more accurate design results, Qc and CBR data are needed. To provide this connection using Cone Penetration Test (CPT) data at 4 stations and using correlation from the initial soil state data, soil stratigraphy is needed from the segment that will receive the construction. In this study, the CBR value correlation from Rahardjo (1996) and the Novo SPT application was used to obtain the CBR value and then describe the stratigraphy of the soil in that segment. From the results of the CPT to the correlation and Novo SPT, the CBR value to a depth of 2.0 m has not reached 6%, meaning that in this segment, if road construction is to be carried out, it requires soil improvement to obtain a CBR of at least 6%.
Pengerasan Permukaan Baja Karbon Rendah Melalui Proses Pack Carburizing Dengan Menggunakan Arang Cangkang Kemiri Napitupulu, Richard Alfonso; Manurung, Maruba; Manurung, Charles S.P.; Peranginangin, Siwan Edi
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.919

Abstract

The easiest and most frequently used way to increase the surface hardness of the steel while maintaining its inner ductility is the Pack Carburizing process. By using a carburizer from candlenut shell charcoal as a carbon source, sodium carbonate as a catalyst and SAE 20 oil as a cooling medium. The research variables were T1 = 850o C, T2 = 900o C, T3 = 950o C, T4 = 1000o C while the holding time used was 120 minutes. The highest hardness from the research results was found at T3 900o C = 543.8 HV followed by T2 950o C = 542.8 HV, T1 850o C = 529.2 HV, and T4 1000o C = 527.4 HV
Analisis Struktur Portal Bidang Dengan Beban Lateral Menggunakan Metode Elemen Hingga Pasaribu, Humisar; -, Bartholomeus
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.927

Abstract

It is necessary to carry out a safety and comfort inspection of the existing wharf structure to ensure the facility’s service life. To check the safety and comfort, it is necessary to do a structural analysis. In the world of civil engineering, there are many problems in analyzing structures that need to be analyzed for working loads or assessing the existing wharf structures that are loaded by ship berthing loads and loads on the floor plates. This research is limited by conducting research on port ports that are burdened with berthing loads. The results of this study are deformation at the nodes in the horizontal and vertical directions of the global and local axes. Based on the analysis carried out, a maximum horizontal deformation of 4.363 cm is obtained and is less than 0.5% H (or 7.4 cm) as required in SNI 8460:2017. Thus, it can be concluded that the structure can still bear the impact of a ship weighing 30,000 DWT.
Analisa Kebutuhan Energi Termal Pada Kotak Pengering Biji Kopi Arabica yang di Isolasi dengan Aluminium Foil Siagian, Parulian; Napitupulu, Richard A. M.; Tampubolon, Miduk; Siagian, Lestina
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.946

Abstract

The experiment test was carried out to obtain the composition of the caloric quality needed to determine the water content and the mass amount of coffee beans when they were dried by utilizing the sun's heat. Heat transfer processes by convection, conduction and radiation play an important role in the drying process with heat quality. Ambient temperature data of 350C with a constant fan rotation speed of 1.0m/s. The duration of the test is 5 days where the initial sample weight is 5000gr with the final result being a water content of 12-15%, with a duration of testing per day for 10 hours starting at 08.00-18.00Wib. The final drying weight of coffee beans for 5 days is: 2500.21gr with an initial weight of 5000kg. The temperature difference around the box is 31,110C. heat weight to evaporate water content Qh= 65.6058.kJ. and the heat required in heating the Coffee beans is 72,839 kJ. The ability to dry 5000gr of coffee beans requires total heat: 138.43kJ with a drying box volume of 8.88m3.
VARIASI DIAMETER PULLY MESIN PENGIRIS SINGKONG DENGAN SISTEM CRANKSHAFT Samosir, Shandy Arion Pratama; Purba, John Sufriadi; Naibaho, Winfrontstein; Sihombing, Suriady; Nababan, Wilson S; Peranginangin, Siwan Ediamanta
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1091

Abstract

Mesin pengiris singkong dengan sistem crankshaft ini dirancang bertujuan untuk mempermudah meningkatkan nilai tambah dan efisiensi dari sebuah proses pembuatan singkong terhadap hasil irisan singkong. Mesin ini digunakan untuk membantu para petani kecil untuk menghasilkan produk yang besar, hemat waktu dan tenaga kerja. Pada dasarnya prinsip kerja mesin pengiris singkong ini berawal dari sebuah motor listrik yang menghasilkan daya dan putaran yang ditransmisikan ke poros. Dalam prosesnya kami mengalami masalah mengenai variasi hasil kualitas dan kuantitas dari mesin pengupas ini yang bertujuan untuk meningkatkan performa mesin. Untuk dapat mengatasi variasi hasil tersebut dapat dilakukan pengujian dalam tiga kali pengujian dengan 1 kg tiap pengujian dengan 3 variasi diameter puli yaitu 115 mm (6 inch), 87 mm (3 inch) dan 79 mm (3,425 inch). Hasil pengujian dengan menggunakan daya motor listrik sebesar 0,5 HP dan efisiensi tertinggi didapat sebesar 18 detik.
Pengaruh Kebersihan Bahan Bakar Dengan Modifikasi Pada Purifier Fuel Oil Terhadap Unjuk Kerja Motor Bakar Kapal Nduru, Jonathan Matthaeus; Tanujaya, Harto; Darmawan, Steven
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1171

Abstract

Kebersihan dan kemurnian bahan bakar merupakan salah satu faktor yang mempengaruhi efisiensi dan performa suatu mesin. Bahan bakar yang digunakan dalam penelitian ini adalah solar tipe B30 dan digunakan untuk menjalankan mesin penggerak utama tipe kapal tunda. Dalam setiap proses bunkering atau pengisian bahan bakar kapal sering dijumpai bahan bakar yang bercampur dengan air, mengandung pasir, lumpur dan endapan lainnya yang dapat menyebabkan penurunan performa dan kerusakan komponen mesin seperti injektor. Sehingga digunakan mesin bantu untuk menyaring bahan bakar yaitu fuel oil purifier. Namun kinerja purifier tersebut kurang optimal karena kandungan air dan pasirnya yang besar, sehingga dilakukan proses modifikasi yaitu penambahan komponen filter separator yang menjadi dasar penelitian. Awalnya bahan bakar melewati 2 proses filtrasi dan dengan proses modifikasi menjadi 3 kali proses filtrasi untuk memudahkan kinerja fuel oil purifier dan bahan bakar yang dikonsumsi mesin induk menjadi lebih jernih. Sebelum proses modifikasi, tenaga indikator mesin sebesar 1593 HP dengan daya efektif 1600 HP, sedangkan setelah dilakukan modifikasi tenaga mesin bertambah dengan tenaga indikator menjadi 1606 HP dan daya efektif 1620 HP.
Analisis Pengaruh Variasi Campuran Briket Tongkol Jagung dan Briket Tempurung Kelapa Sebagai Energi Alternatif Sianturi, Roy Lamrun; Nababan, Wilson Sabastian; Peranginangin, Siwan Ediamanta; Sihombing, Suriady; Tampubolon, Hendra Ricardo
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1191

Abstract

Penelitian ini dilakukan untuk menegetahui tingkatan nilai kalornya dari setiap variasi campuran briket dan bahan bakar yang berkualitas. Prosedur penelitian secara umum dilaksanakan dalam dua tahap pembuatan, yaitu pembuatan briket arang dan pengujian briket arang. Pengujian dilakukan untuk mengetahui tingkat nilai kalor camuran briket arang dan tongkol jagung. Hasil pengujian diperoleh dengan penambahan arang tempurung kelapa dapat meningkatkan kualitas briket arang tongkol jagung dengan nilai kerapatan mesh 400 (0,61-0,70 gr/cm3) dan mesh 800 (0,57–0,65), kadar karbon terikat pada mesh 400 (23,52-57,95%) dan pada mesh 800 (11,74 - 44.65), nilai kalor (14522.11282-24486.21246 kJ/kg), kadar air pada mesh 400 (7,7-4,8%),dan pada mesh 800(9,6 – 7,73), nilai kadar zat menguap pada mesh 400(39,37-26,64%)dan pada mesh 800 (53,03 – 29,37), nilai kadar abu pada mesh 400 (30,10-11,72%) dan mesh 800 (33,04 – 18,35). Nilai kalor tertinggi pada mesh 600 dengan perbandingan komposisi 75% serbuk tongkol jagung dengan 25% serbuk tempurung. Semakin tinggi nilai kadar karbon terikat maka semakin tinggi nilai kalor yang dihasilkan dan semakin kecil nilai kadar air,kadar zat menguap, kadar abu maka semakin bagus nilai kalornya. Maka briket arang yang mempunyai kualitas lebih baik dan mendekati standar adalah briket arang dengan kombinasi 0% arang tongkol jagung : 100% arang tempurung kelapa.
ANALISIS TEKNO EKONOMI ATAP SURYA STUDI KASUS DI KOTA MEDAN, INDONESIA Nababan, Wilson Sabastian; Sihombing, Suriady; Peranginangin, Siwan Ediamanta; Napitupulu, Richard A.M
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1197

Abstract

Indonesia has released its pledge on reducing Greenhouse Gas (GHG) emissions. Mitigation measures include increasing the use of renewable energy. Solar roofs are one potential mitigation measure to meet GHG emission reduction and renewable energy targets. As more attention is being focused on developing this renewable energy resource globally, the technical and economic assessment of this resource is critical to ascertain its feasibility. In this study, a technological and economic analysis of solar roof tops is presented. The analysis was carried out based on solar irradiation in the city of Medan, Indonesia. Solar irradiation over several days was measured. The measured data and the solar photovoltaic module panels available in the Indonesian market are used to carry out the technical analysis. Based on the technical analysis and economic analysis carried out, the economic analysis of the results of the visualization of the power produced by the PV system which was carried out for 1 year resulted in a total value of electricity of IDR 3,672,895 for the city of Medan. It is expected to provide the necessary information to build cities with low emissions. Keywords: Solar Roof, Photovoltaics, Technoeconomics

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