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Accurate: Journal of Mechanical Engineering and Science
Published by Politeknik Negeri Cilacap
ISSN : 27224279     EISSN : 27225089     DOI : https://doi.org/10.35970
Core Subject : Science, Engineering,
Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Accurate: Journal of Mechanical Engineering and Science is a peer-reviewed open-access journal with e-ISSN 2722-5089 and p-ISSN: 2722-4279 published by Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Cilacap. The journal invites scientists and engineers to exchange and disseminate theoretical and practice-oriented in the various topics include, but not limited to mechanical Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 60 Documents
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Pengembangan Desain Alat Pemotongan Kripik Singkong Dalam Peningkatan Produksi (Studi Kasus Pada UMKM di Pemalang) Saputro, Yoyo; Yudha Saksono, Deky
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 2 (2021): October 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i2.854

Abstract

Cassava is a tuber plant that can grow in tropical areas with hot and humid climates. In tropical climates cassava is needed for its growth process so that this plant cannot grow at temperatures below 10 c. Cassava is a tuber or tree root that can grow on sandy to clay soil, as well as on low fertility soil. The length of cassava ranges from 15-30 cm with a relatively different diameter, which is 2-5 cm. Cassava has a skin consisting of two layers, the first layer is the outer skin while the second layer is the inner skin with white or yellowish flesh. In its production so far, cassava cutting is still using human power (manual). It would be better if the production of cassava cutting increased without ignoring the existing human aspects. Therefore, a machine is needed as a human tool in increasing the productivity of cassava cutting. Significant results or not, can later be observed from the data obtained before and after using the machine. A significant increase after the experiment was carried out means that the cassava cutting machine was able to help the existing cutting process. This can be seen later by using SPSS calculations.
Rancang Bangun Sistem Automatic Semi Returnless Berbasis Arduino Uno pada Engine Caterpillar C27 Studi Kasus PT. Saptaindra Sejati Sulis Widi Achmad Sukisno; Joko Suparno; Dimas Ardiansyah
Accurate: Journal of Mechanical Engineering and Science Vol 3, No 1 (2022): April 2022
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v3i1.1212

Abstract

Unit pompa dengan mesin Caterpillar C27 bersistem bahan bakar EUI (electronic Unit Injector) sering low power akibat filter clogging pada PT. Sapta Indra Sejati (SIS). Filter clogging terjadi disebabkan kandungan biofuel yang mengental dan menimbulkan kerak. Jika mesin bermasalah maka proses penambangan bisa terganggu karena area muat batu bara tergenang air. Penelitian ini bertujuan membuat sistem tambahan berupa automatic semi returnless dimana jalur return bahan bakar dirubah secara otomatis masuk ke filter karena fuel return keadaanya bersih. Pergerakan control valve pengubah arah return diatur mikrokontroler yang di program sesuai spesifikasi dan kebutuhan. Mikrokontroler yang digunakan yaitu Arduino Uno dengan sensor tekanan dan temperatur. Arduino Uno diprogram ketika mesin akan mengalami low power dengan tekanan bahan bakar 400 kPa maka jalur kembali dirubah menjadi semi returnless. Dengan perubahan jalur semi returnless maka tekanan menjadi stabil pada 380 kPa dan RPM engine stabil dengan power yang masih terjaga. Kelebihan sistem semi returnless yaitu biaya penggantian filter bisa berkurang dan waktu produksi tidak terganggu
Pengaruh Perlakuan Alkaline dan Hot Water Treatment Terhadap karakteristik Kekuatan Komposite berpenguat serat kenaf dan Microcrystalline cellulose Sakuri, Sakuri; Dwi Nugroho, Dimas; Sugiarto, Tris
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 2 (2021): October 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i2.876

Abstract

Tujuan penelitian digunakan untuk mengetahui tingkat pengaruh perlakuan hot alkali pada serat kenaf dan melakukan penambahkan microcrystalline cellulose(MCC) untuk meningkatkan kekuatan tarik dan kekuatan lentur komposit. Serat kenaf direndam dengan larutan NaOH sebanyak 6 % berat dan aqudes. Waktu perendaman selama 6 jam dengan perlakuan hot alkali pada temperatur sebesar 40 °C, 60 °C dan 80 °C. Pencampuran matrik unsaturated polyester dan microcrystalline cellulose menggunakan magnetic stirrer dengan menerapkan metode Taguchi. matrik Unsaturated polyester dan MCC dicampur dengan suhu 40 oC, kecepatan putar 250 Rpm, selama waktu 30 menit, dengan komposisi MCC sebesar 5 %. Pencetakan komposit menggunakan sistem injection molding dengan penekan menggunakan kemampuan dongkak. Hasil pengujian kekuatan tarik menunjukkan adanya peningkatan sebesar 27,91 %, dari kekuatan tarik sebelum perlakuan 66,69 MPa menjadi 85,65 MPa. Hasil pengujian kekuatan lentur meningkat sebesar 31,41 %, dari serat tanpa perlakuan 75,25 MPa menjadi 98.89 MPa dengan perlakuan hot alkali 40 oC. Modulus elastisitas memiliki grafik yang sebanding dengan hasil kekuatan tarik dan kekuatan lentur. Peningkatan kekuatan tarik dan lentur dikarenakan serat telah bersih dari kotoran akibat perlakuan hot lkali dan pencampuran microcrystalline cellulose.
Pengaruh Sudut Sudu Turbin Jenis Taper Terhadap Tip Speed Ratio (TSR) dan Power Coefficient (CP) pada Turbin Angin Horisontal Berbasis Q-Blade Roy Aries Permana Tarigan; Radhi Ariawan; Adam Jauza Maulana; Wais Al Khorni
Accurate: Journal of Mechanical Engineering and Science Vol 3, No 1 (2022): April 2022
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v3i1.1215

Abstract

Pemanfaatan energi angin sebagai pembangkit listrik masih perlu untuk ditingkatkan, dengan melihat performa turbin yang tidak selalu sama pada kondisi daerah yang berbeda. Penelitian ini bertujuan untuk mengetahui pengaruh sudut sudu (30, 50, 70, dan 100) turbin terhadap TSR dan CP dengan menggunakan simulasi Q-Blade. Software Q-Blade digunakan untuk mengetahui perbandingan nilai CP dan TSR, sehingga dapat memprediksi nilai daya yang dihasilkan pada putaran sudu. Data yang digunakan pada penelitian ini, sebagai variabel tetap, adalah tipe airfoil NACA 4412, jenis sudu taper, jumlah sudu (4), jari-jari sudu (0,3 m), kecepatan angin ± 3,6 m/s. Hasil simulasi yang ditampilkan berupa grafik hubungan CP terhadap perubahan TSR dan gambar simulasi pendistribusian beban yang terjadi pada geometri sudu. Nilai CP tertinggi dihasilkan dari sudut sudu 30 pada angka TSR 5, yaitu  ±0,4. Nilai pembebanan yang rendah pada daerah sumbu/rotor, pada variasi sudut sudu 30, menyeimbangkan gaya sentrifugal pada fluida yang berputar. Gaya sentrifugal menghasilkan gaya dorong pada turbin, sehingga sudu berputar dengan nilai CP yang tinggi pada daerah tersebut.
Pengaruh Variasi Porting pada Head Cylinder Terhadap Unjuk Kerja Mesin Sepeda Motor 4 Langkah 110 CC Warso, Warso; Rekto Prabowo, Nugrah; Nurwibowo, Trio
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 2 (2021): October 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i2.1010

Abstract

Improving engine performance can be done by making changes to the cylinder head to increase the volumetric efficiency. The purpose of this study was to determine the effect of ported variations on the cylinder head against the engine performance which includes: airflow, torque, and power, generated by the ported variations on the inlet channel inside the standard cylinder head with the inlet port size of 21.50 mm. The ported variation 1 with a 23.50 mm inlet port diameter, and the ported variation 2 with an inlet port diameter of 25.50 mm. The research method used was an experimental method, carried out on a 4-stroke 110 cc motorcycle. The results obtained indicated the differences in the performance produced, such as airflow, torque, and power in the three variations of the inlet port. In the Cylinder head ported variation 1, the maximum air flow obtained was 30 cfm at 7 mm valve opening. The airflow increased by 3.59% against the standard cylinder head which obtained a maximum airflow of 28.8 cfm at the same valve opening. On the other hand, the cylinder head ported variation 2 obtained a maximum airflow of 27.6 cfm at the same valve opening. It means that the airflow decreased by 4.77% against the standard cylinder head. On ported variation 1 cylinder head, a maximum torque of 8.91 Nm was obtained at 4250 rpm, resulting in the torque increase of 2.49% against the standard cylinder head which obtains a maximum torque of 8.58 Nm at 4500 rpm. With the ported variation 2 cylinder head, maximum torque of 8.15 Nm was obtained at 5750 rpm rotation, which means that the torque decreased by -3.53% against the use of a standard cylinder head. With ported variation 1 cylinder head, maximum power of 7.49 HP was obtained at 7250 rpm and the power increased by 2.41% against the standard cylinder head, which obtained maximum power of 7.27 HP at 7500 rpm. While the ported variation 2 cylinder head, the maximum power obtained was 7.16 HP at 7500 rpm, meaning the decrease in power obtained by -2.76% against the standard cylinder head.
Analisa Kerusakan Transmisi Otomatis dengan Metode Failures Mode and Effects Analysis (FMEA) dan Logic Tree Anaysis (LTA) Jenal Sodikin; Unggul Satria Jati
Accurate: Journal of Mechanical Engineering and Science Vol 3, No 1 (2022): April 2022
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v3i1.1273

Abstract

Sistem pemindah tenaga merupakan bagian yang tidak terpisahkan dari sebuah unit kendaraan, komponen ini berfungsi sebagai penerus daya dari mesin, memperbesar momen yang dihasilkan mesin sesuai kebutuhan beban dan kondisi jalan serta membalikan putaran. Jenis Seiring usia pakai dari kendaraan maka transmisi yang digunakannya akan mengalami kerusakan atau bahkan gagal fungsi, sebagian besar transmisi otomatis mulai bermasalah setelah kendaraan digunakan diatas 100.000 km atau pada kendaraan yang tidak digunakan sesuai dengan ketentuan serta tidak melaksanakan prosedur perawatan  dengan baik maka kerusakan transmisi otomatis bisa datang lebih cepat. Berdasarkan penerapan metode Failures Mode Effects Analysis (FMEA) yang digunakan untuk mengevaluasi komponen pada suatu sistem dengan cara meneliti potensi model kegagalannya untuk menentukan dampak yang akan terjadi pada komponen atau sistem kerja ditemukan nilai Risk Piority Number (RPN) yang paling tinggi terdapat pada komponen Seal Piston Matic Sebesar 450, Multiple Clutch/Clutch Pack 360, Selenoid Valve 324. Setiap potensi dari model kegagalan diklasifikasikan berdasarkan dampak yang dapat ditimbulkan pada keberhasilan sistem tersebut ataupun pada keselamatan pengguna dengan pembagian katagori menggunakan  Logic Tree Analysis (LTA) dengan hasil sebagian besar komponen transmisi otomatis termasuk dalam kerusakan tipe B (Outage Poblem) dimana komponen tersebut mengakibatkan kegagalan pada seluruh atau sebagian sistem. Berdasarkan nilai RPN maka pemeliharaan yang tepat adalah Pemeliharaan Prediktif.
ANALYZING INDUSTRY 4.0 WITH AN EXAMPLE FROM AGRICULTURAL MANUFACTURING Turapov, Bahram; Siegfried, Patrick
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 2 (2021): October 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i2.1079

Abstract

A study of industry 4.0 technologies in the John Deere and Company and their impact on company operations is presented in this paper. Deere and Company’s implementation of Industry 4.0 to its factories and its factors was the focus of the research. The literature review with the systematic approach as well as a comprehensive review of current John Deere and Company’s developments is used in the current study. Also, it relied on freely available information on the company website. Public and investor relations have also been used as credible sources of information. An analysis found that adopting industry 4.0 technologies to agriculture manufacturing results in higher quality products, increased productivity, safety, and wider acceptance among stakeholders. This study assumes full implementation of these technologies in all agriculture manufacturing companies, and it also emphasizes up-to-date technologies. Studying this topic can be useful for engineers in mechanical and agricultural fields, managers in business, and marketers.
PENGOPERASIAN ALAT PRODUKSI METANA DARI PEMBAKARAN LIMBAH KULIT PADI Yoyo Saputro
Accurate: Journal of Mechanical Engineering and Science Vol. 1 No. 1 (2020): April, 2020
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v1i1.194

Abstract

This study aims to obtain the design and operation of methane (CH4) production equipment from burning of rice husk waste by burning it in a burner setup (testing) and to determine the effect of variations in air mass flow on the combustion temperature of rice husk waste, boiling time of water, and burning time maximum, combustion temperature. In this study using air mass flow of 0.020 m3 / s, 0.022 m3 / s, and 0.024 m3 / s, data collect ion included burning 5 kg of rice husk waste, boiling water volume, maximum flame time, combustion temperature. The results of the production of methane scale mass flow production tools have an effect on the effective flame and heat value. Or it can be concluded that the lower the mass of air mass used the longer the maximum flame produced, so that the heat obtained is also greater.
Rancang Bangun Sistem Automatic Semi Returnless Berbasis Arduino Uno pada Engine Caterpillar C27 Studi Kasus PT. Sapta Indra Sejati Widi Achmad Sukisno, Sulis; Suparno, Joko; Ardiansyah Halim, Dimas
Accurate: Journal of Mechanical Engineering and Science Vol. 3 No. 1 (2022): April 2022
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v3i1.1508

Abstract

Pump units with a Caterpillar C27 engine with an EUI (Electronic Unit Injector) fuel system that often has low power due to filter clogging at PT. Sapta Indra Sejati. Filter cloggingoccurs due to due to the thickened biofuel content and creates a crust. If the machine has a problem, the mining process can be disrupted because the coal loading area is flooded. This study aims to create an additional system in the form of a automatic semi-returnless where the fuel return line is changed automatically into the filter because the fuel return is clean. The movement of the return control valve is regulated by a microcontroller which is programmed according to specifications and needs. The microcontroller used is Arduino Unowith pressure and temperature sensors. Arduino Uno is programmed when the engine will experience low power with a fuel pressure of 400 kPa then the return path is changed to semi returnless. With a change in the semi returnless path, the pressure becomes stable at 380 kPa and the engine RPM is stable with power that is still maintained. The advantages of semi-returnless system are that filter replacement costs can be reduced and production time is not interrupted.
Pengaruh Sudut Sudu Turbin Jenis Taper Terhadap Tip Speed Ratio (TSR) dan Power Coefficient (CP) pada Turbin Angin Horisontal Berbasis Q-Blade Aries Permana Tarigan, Roy; Ariawan, Radhi; Jauza Maulana, Adam; Al Khorni, Wais
Accurate: Journal of Mechanical Engineering and Science Vol. 3 No. 1 (2022): April 2022
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v3i1.1509

Abstract

The utilization of wind energy as a power plant still needs to be improved by looking at the turbine performance, which is not always the same in different regional conditions. This study aims to determine the effect of the blade angle of the turbine on the tip speed ratio (TSR) and power coefficient (CP) by using a Q-Blade simulation. Q-Blade software can predict the value of the power generated at the blade rotation by comparing the CP and TSR values. The type of airfoil NACA 4412, taper blade, blade's numbers (4), blade radius (0.3 m), wind speed ± 3.6 m/s were fixed variables in this study. The simulation generated a graph of the relationship between CP and TSR changed and a simulation image of the load distribution ensued in the blade geometry. The blade angle of 30 at the TSR number 5 produced the highest CP values, which was ±0.4. The low loading value in the axis/rotor region, at a variation of the blade angle of 30, balances the centrifugal force on the rotating fluid. The centrifugal force produces thrust on the turbine so that the blade rotates with a high CP value in that area.

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