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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 93 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.
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 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.
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.
PENERAPAN SISTEM OTOMASI DALAM PEMBERIAN PAKAN IKAN LELE GUNA MENGEFISIENSI WAKTU Sanam, Sanam; Azpah, Inda Aidatul; Bohari, Bohari; Abdillah, Hamid; Putra, Ananda Yutho Wibisono
Accurate: Journal of Mechanical Engineering and Science Vol. 5 No. 1 (2024): April 2024
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v5i1.1490

Abstract

Catfish is a cultivated fishery commodity that has quite large business opportunities to be developed to fulfill community nutrition. Feeding in catfish farming is very important and is one of the things that really needs to be considered. Feeding must be planned so that catfish can grow optimally. Unscheduled feeding results in increased cannibalism among catfish. The use of an automation system must be implemented in order to make it easier and more efficient in feeding catfish. The research method used in writing this scientific work is by using literature study. The purpose of this writing is to find out and implement an automation system for feeding catfish to make it easier and more efficient in feeding catfish. The results obtained from this automatic tool can make it easier for humans to operate, so that it no longer needs to be powered manually. Just automatically use the feeder. In conclusion, the implementation of an automatic system using IoT and Arduino Uno has been proven to be able to streamline catfish feeding times.
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.
Analisa Kerusakan Transmisi Otomatis dengan Metode Failures Mode and Effects Analysis (FMEA) dan Logic Tree Anaysis (LTA) Sodikin, Jenal; Satria Jati, Unggul; perdana wanti, linda
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.v3i1.1510

Abstract

The power transfer system is an inseparable part of a vehicle unit, this component functions as a power source from the engine, increasing the moment generated by the engine according to the needs of the load and road conditions and reversing the rotation. Type As the age of the vehicle, the transmission it uses will be damaged or even fail to function, most automatic transmissions start having problems after the vehicle is used above 100,000 km or on vehicles that are not used in accordance with the provisions and do not carry out maintenance procedures properly, the automatic transmission is damaged. could come sooner. Based on the implementation of the Failures Mode Effects Analysis (FMEA) method which is used to evaluate components in a system by examining the potential failure model to determine the impact that will occur on the component or work system, it is found that the highest Risk Piority Number (RPN) is found in the Seal component. Piston Matic 450, Multiple Clutch/Clutch Pack 360, Selenoid Valve 324. Each potential failure model is classified based on the impact it can have on the success of the system or on user safety by dividing the categories using Logic Tree Analysis (LTA) with the results of most components automatic transmission is included in the type B failure (Outage Problem) where the component causes failure of all or part of the system. Based on the RPN value, the right maintenance is Predictive Maintenance.
Pengaruh Variasi Suhu pada Aerator 10 Watt dengan Panel Surya 80 WP Terhadap Kandungan Oksigen Terlarut Rachmawati, Putri; Agistya Anugrah, Rinasa; Ulikaryani
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.v3i1.1512

Abstract

The fulfillment of energy for humans and animals is increasing day by day. This is evidenced by the fulfillment of electricity needs. This need is ab basic need, where humans and animals need electricity consumption 24 hours a day. So that renewable energy is needed with solar power generation for 12 hours of electricity. This research is focused on fulfilling electricity consumption in nile tilapia fish with 80 WP slar panels and 10 watt aerator power. The purpose of this study was to determine the level of dissolved oxygen in the water, the temperature in the water and the temperature in the surrounding environment. This research method uses a direct observation of dissolved oxygen with a predetermined data collection time using a dissolved oxygen measuring instrument that can be used in water. The result of this study indicate that the dissolved oxygen content produced is 14.61 mg/l with a thermal in water of 26.30C and thermal environment of around 280C.
Pengaruh Penambahan Limbah Plastik Sebagai Alternatif Pengganti Bata Beton Dinding Rumah Prabowo, Dian; Hardini, Probo; Kurniawan, Ipung; Santoso, Agus
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.v3i1.1513

Abstract

The current handling of waste, especially styrofoam, plastic, used oil is not optimal, these wastes can be used to manufacture other products such as bricks with a simple process. If the waste is processed properly, it will get good economic value. To get a good value or product, it is necessary to do research or testing, as in this study, namely the use of styrofoam waste, plastic and used oil to be used as bricks. In this study, it is hoped that the public will understand and understand the quality of the types of composite bricks and ordinary types of bricks seen from their advantages and disadvantages. Styrofoam waste, plastic and used oil are mixed into bricks with a volume of 21.27%. The equipment used in this research are chopper, stirrer, digital balance and compression test machine. In this study, the results of the III (composite) molded bricks decreased the compressive strength of 59% compared to mortar and cement bricks. The results of the compressive strength test in mold III (composite) were 47.76% higher than that in mold II on composite brick. Composite III bricks are classified as quality III, namely with solid type bricks that cannot get a large load.

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