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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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Simulasi Pemograman Pengendali PWM Kecepatan dengan Mikrokontroler Arduino berbasis Sensor Ultrasonik HC-SR04 pada Purwarupa Mobil Listrik Dwi Aji Saputra; Bana Handaga; Marwan Effendy; Dimas Ardiansyah Halim
Accurate: Journal of Mechanical Engineering and Science Vol. 1 No. 2 (2020): October 2020
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v1i2.328

Abstract

The braking process is the basis in the making of the PWM speed control system in order for electric cars to be able to stop automatically and increase the driving safety. The usage of an electric motor as a wheel drive for an electric car allows controlling with a microcontroller. Based on the journal about electric motor control, it is necessary to study the use of PWM as a speed controller. The C language as a coding language can be understood by the Arduino microcontroller with the aim of regulating the speed of the electric motor. The research objective was to use the C language programming as a PWM speed controller with the Arduino microcontroller. The methodology used in this study was to modify a remote control car (RC) made as a prototype electric car. The Arduino microcontroller system was installed and programmed in C language as a PWM speed controller. The main sensor tool used was the ultrasonic distance sensor as the microcontroller input data. Direct current (DC) motors on RC cars were regulated with a pulse width modulation (PWM) signal as the output from the Arduino. LCD and buzzer were used as display devices and indicators of safe distances between prototypes and obstructions. The test results showed that the detection distance of the ultrasonic sensor reached 2 cm to 500 meters. Then the acceleration data obtained by pulse width modulation 64 at 1 meter distance, 127 at 3 meter distance, 191 at 4 meter distance, 225 at 5 meter distance and was made in graphic form. In a speed control system, the usage of the Arduino UNO microcontroller was easy to apply and had complete features. The series of speed control systems could be applied to electric cars with the PWM slow reduction criteria in two stages. The PWM lowering process took 1 second after the sensor detects an obstruction object.
Rancang Bangun Coffee Roaster Machine Kapasitas 1 Kg dengan Menggunakan Pengatur Suhu dan Waktu Termostat Rex-C 100 Dian Prabowo; Unggul Satria Jati; Windra Jaya
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.v1i1.171

Abstract

Coffee Roaster Machine with Temperature Controller and Timer Capacity 1 Kg is designed to optimize heat from the heater and has a cheaper price than the machines on the market. The goal  in the design of Coffee Roasting Machine with Temperature and Timer is to design, manufacture, perform function tests and test the results of the machine. In the manufacture of this machine the author uses the design method approach of James H. Earle, image software using Solidworks 2017 and working drawings using ISO standards. From the methods that the authors do, obtained the results of the evaluation of the concept of draft decisions are Source pemerers using a DC electric motor with a 12 volt voltage, heat source using a heater with 1500 watts of power, and the total cost used to make this machine of  Rp. 4.296.912,32.
Pengaruh Variasi Colling pada Pengelasan GMAW Terhadap Uji Tarik dan Uji Kekerasan pada Baja ST 60 Warso; Trio Nur Wibowo; Yuliyanti Dian Pratiwi
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i1.578

Abstract

The technology of the manufacturing industry is developing rapidly, where the rapid development of this technology cannot be separated from the welding field. In the welding process, thermal heat is used until the material melts, the heat change will also cause changes in the structure, stress and also deformation of the material. This is because the more carbon elements are captured, the more martyred structures are formed. This causes an increase in the value of hardness and tensile strength values in the material. The purpose of this study was to determine the effect of the temperature of the cooling medium oil, salt water, water. dromus, and free air in GMAW welding on the tensile test of ST 60 steel. To determine the effect of cooling temperature medium of Oil, Salt Water, Dromus Water, and Free Air on GMAW welding toward the tensile test and hardness test of ST 60 steel. Several means used for testing are calculating the tensile stress Mpa and HVN hardness. This research method used the experimental method. The GMAW welding process variations of coolant were used, such as oil, salt water, dromus water, and free air with a time of 25 minutes and electic current of 100 A. The type of seam used was a V type with angle of 30o. The tests carried out were tensile and hardness test. The highest average value of the tensile stress from the the salt water coolant specimen was 490.23 Mpa. The highest average value of the tensile strain from free air specimens was 35.45 Mpa. The average value of HVN hardness from Oil specimens was 208.3 HVN, salt water was 231.0 HVN, Dromus water was 215.5 HVN, and free air was 228.0 HVN. From the average value of HVN hardness, the highest value observed was the salt water specimen with 231.0 HVN.
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.v1i1.183

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 collection 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.
Analisis Kinerja Penukar Kalor Tipe Shell and Tube untuk Pendinginan Governor Markus; Yogi Nugroho Bakti
Accurate: Journal of Mechanical Engineering and Science Vol. 1 No. 2 (2020): October 2020
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v1i2.342

Abstract

One of the elements that affect the reliability and service life of a hydraulic pump is the stability level of oil viscosity as a power successor. The stability level of oil viscosity is affected by changes in temperature. The compression and friction process that the oil receives to move the hydraulic pump will increase the oil temperature so that its viscosity level will decrease. To maintain the performance of the hydraulic pump, the oil temperature must be maintained at room temperature. In the case study at PLTA Ir. H. Djuanda, Lurah Kawi Street No.1 Jatiluhur-West Java, to cool the oil, a shell and tube heat exchanger type JPK 13699068 (single tube) is used. This research was conducted to test whether the heat exchanger is still working properly, the parameter is that the cooled oil exit temperature must be close to room temperature. The effectiveness of the heat exchanger will be tested by comparing the test results with the condition of the heat exchanger without impurity factors. The test was carried out by measuring the temperature of the HX intake oil at 44 0C with a discharge of 0.437 kg/s, and the temperature of the HX inlet water at 28 0C with a discharge of 0.498 kg/s. The results showed that, for the coefficient of U between 110 to 350 W/m2 oC with a water impurity factor of 0.0001 m2 oC/W and an oil impurity factor of 0.0002 m2 oC/W, there was a decrease in effectiveness from an average of 74.5% to 73.7%, and there was an increase in oil temperature out of the heat exchanger from an average of 32.07 oC to an average of 32.21 oC.
Pengaruh Penambahan Butanol Sebagai Campuran Bahan Bakar Premium Terhadap Torsi dan Daya Mesin Bensin Dengan Sistem EGR Firman Lukman Sanjaya; Syarifudin
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.v1i1.175

Abstract

Increased vehicle volume causes a high use of fossil fuels and increased exhaust emissions. Butanol is a renewable fuel that can replace fossil fuels. This is because butanol has better characteristics than gasoline such as high octane value and oxygen content. This results in a more complete combustion process in the combustion chamber so that engine torque and power increase. This study was to observe the effect of using butanol on torque and power in gasoline engines with the EGR system. This test is carried out using a constant engine speed of 2500 rpm. The percentage of butanol in premium fuel is 5%, 10% and 15% of the total fuel volume. The test results show that the addition of 5% butanol to premium fuel can increase torque by 4.88% using a cold EGR system. Engine power experienced the highest increase in the addition of 15% butanol using a cold EGR system of 15.6 kW.
Rancang Bangun Simulator Kincir Pembangkit Listrik Floating Hydro Dian Prabowo; Pujono Pujono
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i1.594

Abstract

Energy consumption in Indonesia is increasing every year, the fulfillment of the energy needed must be overcome. Energy is something that is really needed by anyone, from humans or animals to be able to do something or work. This energy is also abstract, its existence can be felt, but it is difficult to prove. Electricity needs of the community today are a basic need. Electricity usage is almost 24 hours nonstop. To cope with the increasing demand for electricity, it is necessary to utilize natural resources that can be used as new energy resources. The floating hydro power plant simulator is a hydroelectric power plant that utilizes the flow of water from a pump to drive a waterwheel, a device designed to make it easier for students to learn basic electrical engineering and fluid mechanics. The purpose of this design is to design and build a floating hydro power plant and test the tool. The design method used the VDI 2222 method approach, which includes planning, conceptualizing, designing, finishing. The results of the design were according to the method used, namely in the form of a waterwheel simulator design for power plants. The estimated production process time for the manufacture of a floating hydro simulator for cutting 3.9 hours; process of gurdi 3.08 hours; lathe process 1.3 hours; 1.58 hours assembly process; finishing process 2.75 hours = 1.2 days (1 day = 8 hours). The total cost of making the machine was Rp. 2.605,740.00. The driven pulley test results in 65.4 rpm and the driven pulley produced 304 rpm and the output was 12.3 volts.
Pengaruh Variasi Suhu pada Aerator 10 Watt dengan Panel Surya 80 WP Terhadap Kandungan Oksigen Terlarut Putri Rachmawati; Rinasa Agistya Anugrah; Ulikaryani 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.v3i1.1272

Abstract

Pemenuhan energi terhadap manusia maupun hewan semakin hari semakin meningkat. Hal ini dibuktikan dengan pemenuhan kebutuhan listrik. Kebutuhan tersebut menjadikan kebutuhan pokok, dimana manusia dan hewan membutuhkan konsumsi listrik 24 jam. Sehingga dibutuhkan energi terbarukan dengan pembangkit tenaga surya untuk listrik 12 jam. Penelitian ini difokuskan pada pemenuhan konsumsi listrik pada kolam ikan nila dengan panel surya 80 WP dan daya aerator 10 watt. Tujuan penelitian ini adalah untuk mengetahui kadar oksigen yang terlarut dalam air, suhu dalam air serta suhu di lingkungan sekitar. Metode penelitian ini menggunakan metode pengamatan langsung terhadap oksigen terlarut dengan waktu pengambilan data yang telah ditentukan menggunakan alat ukur Dissolved oksigen yang bisa digunakan di dalam air. Hasil penelitian ini menunjukkan bahwa kadar oksigen terlarut dihasilkan sebesar 14.61 mg/l dengan thermal dalam air sebesar 26.30C serta thermal lingkungan sekitar 280C.
Rancang Bangun Energi Matahari 300 Wp Sebagai Suport Energi Listrik Untuk Sistem Energi Hybrid Heri Suripto
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.v2i2.1211

Abstract

Penegembangan energi hybrid terus dikembangakan mengingat kebtuhan energi terus meningkat. Sejalan dengan pengembangannya pemanfaatan energi alternatif menjadi solusi dalam mengatasi kebutuhan energi. Penelitian ini akan melancang dan membuat energi matahari sebagai suport energi listrik yang digunakan untuk sistem energi hybrid berbasis energi matahari dan energi hidro, dari hasil perancangan kerangka dudukan modul sel surya menghasilkan spesifikasi ukuran tinggi 100 cm lebar 67 cm dan panjang 90 cm, dari perhitungan didapat konsumsi energi listrik pompa 125 watt 32 liter/menit untuk mengisi tangki air sebesar 1000 liter adalah sebesar 66,7 watt, perhitungan daya solar sel sebesar 33,6 watt per unit maka jumlah modul sel surya yang dibutuhkan sebanyak 2 unit modul surya, perancangan modul sel surya di buat 3 unit sehingga 1 unit digunakan sebagai saving energi listrik. Hasil pengujian berdasarkan radiasi matahari maka intensitas radiasi matahari rata-rata sebesar 4916 (watt/m2) dengna daya sebesar 19,76 watt.
Pengaruh Penambahan Limbah Plastik Sebagai Alternatif Pengganti Bata Beton Dinding Rumah Dian Prabowo; Probo Hardini; Ipung Kurniawan; Agus Santoso
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.v3i1.1379

Abstract

Penanganan limbah saat ini terutama limbah plastik, oli bekas, styrofoam bisa dimanfaatkan menjadi batako ataupun batu bata. Dengan proses sederhana, limbah plastik, oli bekas, styrofoam dapat diubah menjadi produk yang lebih bermanfaat dengan harga bersaing dengan batako biasa. Namun pengujian sifat-sifat fisik batako limbah plastik, oli bekas, styrofoam sebagai bahan bangunan konstruksi masih belum banyak dilakukan. Melalui penelitian ini diharapkan kita dapat mengetahui keunggulan ataupun kelemahan karakteristik batako komposit sebagai bahan bangunan dibandingkan batako biasa.  Tujuan penelitian ini adalah untuk membandingkan karakteristik kuat tekan batako komposit pada beberapa variasi komposisi komposit. Campuran limbah plastik, oli bekas, styrofoam yang dikompositkan dalam batako adalah sebesar 20,26% volume. Campuran oli bekas, plastik, Styrofoam  dan pasir yang dikompositkan dalam batako adalah sebesar 20,26% volume. Cetakan dibuat dari plat baja tebal 3mm dibuat dalam bentuk balok ber alur lebar 150 mm sepanjang 500 mm sebanyak alur 2 buah. Hasil pemeriksaan kuat tekan dibandingkan berat batako oli bekas, plastik, Styrofoam  dan pasir komposisi cetakan III lebih ringan dari cetakan II meskipun voume komposit pada masing-masing cetakan tersebut sama. Hal ini disebabkan karena campuran penekanan pada cetakan II lebih padat daripada campuran pada cetakan III.

Page 2 of 6 | Total Record : 60

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