Otopro
Jurnal Otopro diterbitkan 2 (dua) kali setahun yaitu bulan Mei dan November oleh Jurusan Teknik Mesin, FT-UNESA, sebagai media informasi dan forum kajian masalah ilmu Teknik Mesin. Berisi tentang tulisan ilmiah, ringkasan hasil penelitian, pembahasan kepustakaan dan gagasan kritis yang orisinil. Redaksi mengundang para ahli, praktisi, dan siapa saja yang berminat untuk menyumbangkan tulisan yang belum pernah diterbitkan dalam media cetak lain, tema tulisan meliputi: Permesinan, Konversi Energi, Material dan Metalurgi, Manufaktur, Rancang Bangun Mesin
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159 Documents
<![CDATA[ANALISA PENGARUH AXIAL FORCE DAN ROTATIONAL SPEED PADA PROSES REPAIR AXLE SHAFT BEKAS MENGGUNAKAN FRICTION WELDING TERHADAP KETANGGUHAN AXLE SHAFT ]]>
<![CDATA[Hartanto, Irfan Malik]]>;
<![CDATA[Ainur Rasyid, Akhmad Hafizh]]>
<![CDATA[ Otopro Vol 15, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v15n2.p32-39
<![CDATA[Increasing truck growth and a large number of failure phenomena on Axle Shaft components. Implied by an increase in shaft waste that fails, so an effort is needed to reduce it. One of the waste control methods that can be used is the repair principle. Repair is the maintenance and repair of waste that can still be used for the same function or other functions with certain businesses. The repair method carried out in this study is the process of joining the material using the friction welding process. Seeing the above phenomenon the researcher wants to know the effect of rotational speed and axial force on and toughness in the axle shaft shaft welding area. This research method uses an experimental research method with a welding process carried out on a lathe that has been added a hydraulic pressure device as an axial suppression mechanism. The results showed the greatest impact strength was found in variations of rotational speed of 1010 Rpm with the highest yield of 0.065030 J / mm² at forging pressures of 40 Kg / cm2 in weld metal areas while the lowest impact test results were generated from variations of 1800 Rpm rotational speed of 0.040970 J / mm² at forging pressure 20 Kg / cm2 in the weld metal area. So it can be concluded that rotational speed and axial pressure affect the impact strength of friction welding results]]>
<![CDATA[PERAWATAN PREVENTIF MESIN BUBUT MENGGUNAKAN METODE ANALISIS GETARAN DALAM BERBAGAI KONDISI KECEPATAN SPINDLE ]]>
<![CDATA[Soemardi, Heryanto Budiono]]>
<![CDATA[ Otopro Vol 15, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v15n2.p40-44
<![CDATA[This research proposes a new idea of the preventive maintenance method of the lathe by analyzing the vibration on the fixed gear gearbox of the Maximat lathe. From the results of the vibrations that occur, checks are carried out on the lubricating oil, disability of the existing gears and bearings, and then repairing the gear and bearing and replacing the lubricating oil. To find out the magnitude of vibration that occurs in this maximat lathe, rotation variations are carried out by 1000 (rpm), 1500 (rpm) and 2000 (rpm). The highest average amplitude value at 1000 RPM engine speed is on the Bu04 machine with a value of 0.034 mm / s RMS while the lowest value is obtained on the Bu03 lathe with a value of 0.029 mm / s RMS. At 1500 RPM engine speed, the highest average amplitude value is obtained on the Bu03 lathe with a value of 0.045 mm / s RMS. On the Bu02 lathe with a value of 0.032 mm / s RMS. At 2000 RPM engine speed, the highest average value of amplitude was obtained in the Bu03 lathe with a value of 0.069 mm / s RMS. While the lowest value obtained on the Bu02 lathe with a value of 0.050 mm / s RMS. The lower the vibration of the lathe, the more optimal the results of turning. There is an influence between the speed of the engine against the vibrations that occur. Lathe with a high amplitude level indicates that there are components that need attention]]>
<![CDATA[SIMULASI NUMERIK PENGARUH VARIASI RASIO PANJANG LEADING EDGE TERHADAP KARAKTERISTIK AERODINAMIKA PADA MOBIL PICK UP ]]>
<![CDATA[Pratyaksa, Md Ranasandhya Amy]]>
<![CDATA[ Otopro Vol 15, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v15n2.p45-53
<![CDATA[The aerodynamic style influences fuel consumption due to drag and the stability of the vehicle speed due to the force lift. Varying the geometry of the leading edge is estimated to have an effect on aerodynamics. This study uses a car pickup model with dimensions like the actual size. Geometry Leading Edge can be modified so that in the variation of the ratio of length leading edge of the vehicle's overall length ( ): ; and . The research method used is a 2-D numerical simulation underconditions steady and unsteady using software ANSYS FLUENT 2019 R3. The mesh using Hybrid model, its triangular and rectangular shape. The viscous model used by k-epsilon Realizable with variation Reynolds Number 7.15 x 104; 2.6 x 106; 3.26 x 106 and 3.91 x 106. The result data analyzed are coefficient lift (CL), coefficient drag (CD), velocity contour, velocity streamline, and pressure contour. From the simulation results, varying ratio of the length of leading edge can affect aerodynamic characteristics of the car. The greater leading edge ratio can delay separation above the car. In addition, the momentum deficit behind the vehicle is also getting smaller. Variation of the length ratio of leading edge is the best variation, having a coefficient drag (CD) of 0.72 with a percentage decrease of 4% and a coefficient lift (CL) of 0.07 with a reduction percentage of 36.36% of the standard variation. CD and CL values go down making fuel consumption more efficient and the car more stable.]]>
<![CDATA[ENERGI KONSERVASI PADA POMPA SENTRIFUGAL DENGAN TORQUE FLOW IMPELLER SEMI OPEN DAN CLOSED PADA PENGATURAN KAPASITAS ]]>
<![CDATA[Siregar, Indra Herlamba]]>
<![CDATA[ Otopro Vol 15, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v15n2.p54-58
<![CDATA[Pumps are the most widely used rotating equipment in both the domestic and industrial sectors with a contribution of around 3% of the world's electrical energy usage, in addition to the size of pumps available with many incompatible requirements, it is necessary to regulate their capacity. In this article, there are two capacity setting methods tested, namely valve opening and variable speed drive on semi open and closed centrifugal pump torque flow impeller with blades of 7, 8 and 9. The results explain that in valve opening method the number of blades affects the power consumption pump electricity, although not significant enough, while the variable speed drive method, the number of blades has no effect. However, the power consumption of the impeller closed is lower than the semi open impeller in the valve opening method and there is no significant difference in the variable speed drive method. The capacity setting method with a variable speed drive consumes less electric power than the valve opening method, if the flow of pump more decrease from the initial condition the greater the savings obtained with the variable speed drive method than the valve opening method.]]>
<![CDATA[PENERAPAN TTG MESIN PENGADUK JELADREN DAN RISOPAN JUMBREK DI IKM PACIRAN LAMONGAN ]]>
<![CDATA[Muhaji, Muhaji]]>
<![CDATA[ Otopro Vol 15, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v15n2.p59-63
<![CDATA[The purpose of this activity was designed, (1) make and apply a mixer jeladren machine and risopan jumbrek, (2) to improving productivity and jumbrek higine cake. Based on studies conducted in smes and observation, partner smes make jeladren mixer machine with a stinless stell with an electric motor. So are risopan made of plate stainless steel. The outcome of the activities PKM shows that machine mixer jeladren jumbrek and risopan jumbrek physically cunstruction machines and instrument very good, stout, practical. The results of the tryouts machine jeladren mixer jumbrek pointed out once mixer as 10 kg with 12,5 minutes the average time, so as to mixer material 40 pouns needed time 50 minutes. While with human resources for mixer 40 pounds of (necessary 8 times mixer in the 200 minutes), thus time mixer 4 times faster. The results of the tryouts risopan jumbrek pointed out in time capable of producing 140 seeds jumbrek/30 minutes. Increase the result of long with new risopan 5 times.]]>
<![CDATA[Pengaruh Model Sudu Overlap dan Helix pada Proses Inisiasi Putaran Turbin Savonius ]]>
<![CDATA[Witono, Kris]]>;
<![CDATA[Nasir, Moh.]]>;
<![CDATA[Faizal, Elka]]>;
<![CDATA[Wicaksono, Hangga]]>;
<![CDATA[Pranoto, Bayu]]>
<![CDATA[ Otopro Vol 15, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v15n1.p27-31
<![CDATA[This research proposes a new model of overlap and helix blade shape. The overlap shape of the blades gives room to the air flow shortly after pounding the blades. Air flow direction is strived to be able to push the next blade so that the process of the turbine blade rotation becomes more effective. While the helix model is expected to produce a more efficient turbine rotation due to its multilevel shape. The wind speeds tested were 2 m / s, 4 m / s, and 6 m / s. Turbine speed rotation data retrieval is carried out at each additional time. The overlap blade has a greater angular velocity value of 9.4 rad / s at 2 m / s wind speed, 21.9 rad / s at 4 m / s wind speed, and 29.8 rad / s at 6 m / s wind speed.Turbines with multilevel helix blades have a higher level of stability compared to overlap blades. This is because there are two levels of turbine blades which have an angle difference of 600 which can receive more stable wind collisions. However, due to the smaller cross-sectional area of the helix blade turbine (ie 50% of the overlap blade) the effective impact area on the blade is also getting smaller. So that the energy that can be converted is also relatively smaller than the overlapping blade.]]>
<![CDATA[Penggantian Shock Absorber pada Honda CRV I-VTEC type RE1 di PT. X Surabaya Shock Absorber Replace on Honda CRV I-VTEC type RE1 in PT. X Surabaya ]]>
<![CDATA[Hidayat, Ahmad Khusnul]]>;
<![CDATA[Utama, Firman Yasa]]>
<![CDATA[ Otopro Vol 13, No 2 (2018) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v13n2.p67-72
<![CDATA[Honda CRV adalah salah satu tipe kendaraan SUV (Sport Utility Vehicle) tipe penggeraknya berjenis Front Engine Front Drive (FF) yang penempatan mesin dan roda penggerak utamanya berada di bagian depan. Dikarenakan beban terfokus pada satu titik yaitu didepan maka perawatan pada komponen understell sangat perlu diperhatikan khususnya pada bagian shock absorber. Penggantian shock absorber pada mobil Honda CRV dikarenakan BB (bunyi-bunyi) dalam kategori servis dengan 16 langkah pengerjaan. Agar menghindari kerusakan yang lebih parah, monitoring dan perawatan rutin sesuai petunjuk dan kondisi penggunaan menjadi faktor penting agar komponen selalu mengalami kondisi prima.]]>
<![CDATA[PENURUNAN KEKUATAN IMPACT BAJA ST 37 AKIBAT PENGELASAN SMAW ]]>
<![CDATA[Wahyudi, Eko]]>
<![CDATA[ Otopro Vol 14, No 2 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v14n2.p64-70
<![CDATA[Jurnal ini menjelaskan tentang penurunan kekuatan impact dan struktur mikro pelat baja St 37 setelah dilakukan pengelasan SMAW. Penelitian ini menggunakan metode eksperimen dan metode literatur. Objek dalam penelitian ini adalah pelat baja St 37 yang mengandung sedikitnya 0,12813 % karbon. Jumlah spesimen yang diujikan dalam penelitian ini adalah 27 yang mendapatkan perlakuan kuat arus berbeda. Pengelasan menggunakan elektroda E 6013 dengan variasi kuat arus 80 A, 100 A dan 120 A. Sambungan las menggunakan sambungan kampuh V tunggal dengan sudut 70o. Setiap spesimen yang sudah dilas, dilakukan metode pendinginan dengan media pendigin oli selama 15 detik dengan posisihorizontal. Oli yang digunakan adalah meditran S dengan kondisi baru untuk setiap spesimen variasi kuat arus. Spesimen baja St 37 yang dilas memiliki ketebalan 10 mm. Nilai awal rata-rata kekuatan impact pelat baja St 37 sebelum dilakukan pengelasan SMAW adalah 5,41 J/mm2 dengan struktur mikro ferit dan perlit yang berarti sifat awal dari baja St 37 adalahulet. Setelah dilakukan pengelasan SMAW pada pelat baja St 37, nilai rata-rata kekuatan impact mengalami penurunan. Dari penelitian ini didapatkan hasil pengelasan paling optimal, yaitu pada kelompok kuat arus 100 A dengan nilai rata-rata kekuatan impact sebesar 0,96 J/mm2. Pada kelompok kuat arus 100 A didapatkan struktur mikro ferit halus, bainit atas dan martensit sehingga hasil patahan menjukkan patah ulet-getas. Hasil pengelasan paling rendah didapat kelompok kuat arus120 A dengan nilai rata-rata kekuatan impak sebesar 0,77 J/mm2. Struktur mikro yang didapat pada kelompok 120 A adalah ferit kasar, bainit atas dan martensit sehingga hasil patahannya terlihat getas sepenuhnya.]]>
<![CDATA[PENINGKATAN KAPASITAS TERMAL PENAMPUNG AIR PANAS SOLAR HEATER MENGGUNAKAN CAPSULATED PARAFFIN ]]>
<![CDATA[Anggrainy, Rani]]>
<![CDATA[ Otopro Vol 16, No 2 (2021) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v16n2.p29-33
<![CDATA[Solar power is considered as the most essential renewable energy in human life, particularly for daily activities. The application of solar water heater is significantly able to reduce the electric load of water heating so that this method is indirectly able to save energy needs. The biggest challenge is increasing the energy density of warm water storage. The best storage medium is paraffin, but it is constrained by the low thermal conductivity of the paraffin and also the wrapping media. This study focuses on efforts to improve thermal conductivity of paraffin as a heat storage medium by using nickel mixture at a ratio (volume) of 10 - 50%. Samples of paraffin and nickel paraffin mixture are inserted into the wrapper of aluminum 6063 material and then tested for heat absorption and release process. The best heat absorption is shown by the sample with the most nickel content, while in the heat release process the best performing sample is shown with a nickel mixture between 20–40%. These results are directly related to the power rate of each sample. The results of this study can be used as a reference for increasing the thermal capacity of warm water storage from solar water heaters.]]>
<![CDATA[Efisiensi Proses Produksi Batik Melalui Penerapan Mesin Pengering Batik Dan Kompor Pemanas Lilin Batik Semi Otomatis ]]>
<![CDATA[Budijono, Agung Prijo]]>;
<![CDATA[Kurniawan, Wahyu Dwi]]>
<![CDATA[ Otopro Vol 13, No 1 (2017) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin Universitas Negeri Surabaya ]]>
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DOI: 10.26740/otopro.v13n1.p30-34
<![CDATA[Permasalahan utama yang dihadapi UKM produsen batik yaitu pada saat musim hujan pasti mengalami kendala dan hambatan pada proses pengeringan batik tulis. Selama ini proses pengeringan batik tulis dilakukan secara konvensional yaitu dikeringkan dengan mengandalkan panas sinar matahari sehingga membutuhkan waktu relatif lama (± 1,5 jam). Namun apabila cuaca dalam kondisi mendung atau hujan proses pengeringan bisa membutuhkan waktu 3-4 jam. Dengan kata lain pada saat mendung atau hujan produksi batik akan terhambat secara signifikan hal ini akan berakibat pelanggan akan sering komplain. Selain itu, untuk pemanas lilin batik masih menggunakan kompor gas konvensional yang suhunya tidak terkontrol, jika lilin batik terlalu panas maka kompor harus dimatikan dan jika lilin batik terlalu dingin maka harus menyalakan kembali sehingga kurang efisien. Target yang ingin dicapai dari kegiatan ini yaitu untuk meningkatkan efisiensi waktu proses pengeringan minimal 2 kali lebih cepat dari sebelumnya dan untuk meningkatkan efisiensi konsumsi LPG sebesar 25% dari sebelumnya. Luaran kegiatan ini yaitu mesin pengering batik semi otomatis, kompor pemanas lilin semi otomatis dan publikasi ilmiah. Metode yang digunakan dalam mencapai tujuan tersebut yaitu dengan merancang, manufaktur, assembly dan menerapkan mesin pengering batik printing semi otomatis dan penerapan kompor pemanas lilin batik semi otomatis. Berdasarkan hasil kegiatan yang telah dilakukan, pihak mitra sangat bersyukur dengan adanya kegiatan ini karena usaha yang selama ini mereka rintis dapat berkembang lebih maju. Berdasarkan hasil uji fungsi yang telah dilakukan, maka dapat dikatakan bahwa mesin pengering batik semi otomatis dan kompor pemanas lilin batik semi otomatis dapat bekerja dengan baik dengan uraian sebagai berikut: (1) Suhu dalam ruang pengering dapat dikontrol sesuai kebutuhan (50 ± 5 o Celcius); (2) Proses pengeringan hanya membutuhkan waktu 1 jam yang tidak terganggu oleh cuaca; (3) Konsumsi gas LPG dalam sekali proses pengeringan sebesar 500 gr; (4) Suhu pemanas lilin batik dapat terkontrol dan terjaga sesuai kebutuhan (125 ± 2 oC); dan (5) Konsumsi gas LPG pada proses pemanasan lilin menjadi lebih hemat 30%, yang awalnya membutuhkan 80 gr/jam menjadi 50 gr/jam.]]>
