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Rotasi
Published by Universitas Diponegoro
ISSN : 1411027x     EISSN : 24069620     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 676 Documents
 57   58   59   60   61 
Analisa Penggunaan Turbin Angin Hibah China HD1000 dengan Turbin Angin Sejenisnya Kapasaitas 1 MW/Unit untuk Daerah Pulau Sabang, Provinsi Aceh Benny Susanto; Rasgianti Rasgianti
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.%p

Abstract

The purpose of this study is to find out in general the condition of the AVIC wind turbines that will be donated when compared to similar wind turbines that have been proven. This study is still early and early in nature because it was only carried out by a desk study with reference to AVIC Wind Turbine technical data originating from the Central PLN without conducting field tests and surveys. This study is limited only from a mechanical point of view, namely a comparison of the Power Curve, Capacity Factor and energy production of the AVIC Wind Turbine with similar wind turbines that are already on the market using the Homer software. The simulation was carried out by comparing the AVIC Huide HD1000 wind turbine with a capacity of 1MW with wind turbines with typical capacities on the application HOMER, namely Leitwind 77, Leitwind 80, Leitwind 86 and Leitwind 90. The selected location is the location being studied by the PLN Puslitbang because load data is already available namely Sabang Island
Analisis Cacat Hasil Pengelasan Pada Pipa ASTM A106 Grade B Menggunakan Magnetic Particle Test dan Liquid Penetrant Test di Workshop Las dan Inspeksi PPSDM MIGAS Cepu Bambang Yunianto; Prayogi Wicaksana
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.54-60

Abstract

Inspeksi pengelasan merupakan praktik penting untuk menilai integritas struktur dan komponennya dalam banyak aplikasi industri termasuk sistem perpipaan di bidang minyak dan gas, nuklir, listrik, dan petrokimia industri. Seperti halnya yang dilakukan oleh PPSDM MIGAS Cepu sebagai lembaga pemerintah yang melakukan inspeksi pada hasil pengelasan para peserta diklat maupun peserta sertifikasi juru las agar sesuai dengan standar yang telah ditentukan. Pada artikel ini, penulis melakukan inspeksi hasil pengelasan pada pipa ASTM A106 Grade B menggunakan metode NDT (Non Destructive Test), yaitu Magnetic Particle Test dan Liquid Penetrant Test. Berdasarkan hasil pemeriksaan yang telah dilakukan, ditemukan indikasi cacat yang dapat diterima (accepted) sesuai dengan kriteria keberterimaan ASME Section IX Article 1 QW 195, yaitu cacat pin hole dan porosity. Adapun indikasi cacat yang ditolak (rejected) adalah cacat crack dan empat buah porosity yang berjajar dalam satu garis, sehingga kedua cacat tersebut perlu diperbaiki dan dilakukan pemeriksaan kembali untuk memastikan indikasi cacat yang ditemukan telah hilang.
Analisis Efisiensi Panel Surya Menggunakan Reflektor Dan Sistem Pendingin Berbasis Mikrokontroler Muhamad Jafri
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.61-69

Abstract

The addition of reflectors to solar panels to redirect solar radiation onto the panel surface can lead to increased surface temperatures. Excessive temperature rise significantly impacts the power output. The implementation of a microcontroller-based cooling system can optimize the temperature on the solar panel surface. The research employs an experimental method on four test media, namely solar panels with reflectors at angles of 45° and 60°, with the addition of a microcontroller-based cooling system, solar panels without reflectors with a cooling system, and solar panels without reflectors or cooling system (as the control). The aim of this study is to determine the efficiency of solar panels using reflectors and a microcontroller-based cooling system. The test results indicate that the intensity of light and temperature also affect the generated power. The microcontroller-based cooling system applied to the solar panel maximizes the power output and efficiency. The solar panel using a 60° reflector with cooling produces a power output of 14.10 Watt with an efficiency of 15.9%, while the solar panel using a 45° reflector produces a power output of 14.07 Watt with an efficiency of 15.4%. The solar panel without a reflector but with a cooling system produces a power output of 13.31 Watt with an efficiency of 14.4%, which is higher than the solar panel without a reflector or cooling system, which only produces a power output of 11.264 Watt with an efficiency of 12.1%.
Desain Isolator Termal pada Hotleg dan Coldleg FASSIP-02 Mod.01 Dedy Haryanto
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.70-76

Abstract

Abstrak Fasilitas Simulasi Sistem Pendingin Pasif-02 (FASSIP-02) Mod. 01 merupakan salah satu fasilitas penelitian untuk mempelajari pendinginan reaktor sistem pasif. Latar belakang penelitian ini dilakukan adalah terjadinya kejadian station blackout (SBO) pada PLTN Fukushima Daiichi pada Maret 2011 di Jepang yang berakibat terjadinya kecelakaan nuklir. Hotleg dan coldleg merupakan komponen pada FASSIP-02 Mod.01, hotleg berfungsi sebagai pemipaan fluida kerja sebelum komponen Water Cooling Tank (WCT) sedangkan coldleg sebagai pemipaan fluida kerja setelah komponen Water Cooling Tank (WCT). Penelitian ini bertujuan untuk menentukan ketebalan isolator termal pada hotleg dan coldleg sehingga dapat memperkecil heat loss dan menjamin keamanan saat pengoperasian. Tahapan yang dilakukan dalam menentukan isolator termal silika aerogel sebagi isolator pada hotleg dan coldleg adalah membuat pemrograman pada Matlab serta menjalankan pemrograman tesebut dan melakukan analisis hasil perhitungan. Berdasarkan hasil perhitungan isolator termal yang dipilih adalah isolator termal berbahan silika aerogel dengan ketebalan 50-150 mm yang mengakibatkan heat loss maksimal sebesar 6,5 W/m pada hotleg dan 3,4 W/m pada coldleg. Kata kunci: FASSIP-02 Mod. 01, isolator termal, hotleg, coldleg, Water Heating Tank, silika aerogel
Back Matter Rotasi Vol. 25 No. 2 April 2023
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.App. 1-4

Abstract

Front Matter Rotasi Vol. 25 No. 2 April 2023
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.i-v

Abstract

Karakteristik Kampas Rem Dari Komposit Serbuk Arang Tempurung Kelapa dan Serbuk Tulang Sapi Novianto, Arief; Ismail, Rifky; Saputra, Bagus Ari
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.52-58

Abstract

The number of vehicles being added in Indonesia is increasing every year, so the demand for auto parts is bound to increase as well. The brake pad is one of the most significant and rapidly changing components. Asbestos regulations begin to restrict brake linings. Asbestos brake pads are being phased out in favor of more environmentally friendly or asbestos-free alternatives since they constitute a health and environmental risk. This is why it is suggested that brake pads be made from asbestos-free materials. One of them is to develop the application of a mixture of coconut charcoal powder and cow bone powder as a composite material for brake pads. In addition to coconut shell charcoal and beef bone, other materials used to make composite brakes are aluminium powder, epoxy resin and MgO. These materials are printed by hot pressing at 180°C. This was an experimental research in which three different preparations were modeled. Furthermore, composite brake pads are evaluated for hardness, wear, and heat resistance in order to determine the optimal model. According to the test results, sample 1 has the maximum hardness value of 71.44 HV. Sample 1 has the lowest abrasion value of 2.62 mm2/kg, making it difficult to wear. In the heat resistance test, all three samples meet the SAE J661 requirement because the surface is not damaged during the 360°C test, such as stamping, cracking, puncture, or warping. Thus, sample 1 is the best of the three, with the highest hardness value, the least abrasion, and no damage in the heat resistance test.
Eksperimental Turbin Zephyr dengan Pengaruh Sudu Rotor dan Sudu Statis Kusnadi Kusnadi; Ismail Ismail
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.33-39

Abstract

Efisiensi turbin angin sumbu vertikal tipe zephyr dengan mengoptimasikan parameter-parameter turbin seperti rotor diameter, tinggi rotor, jumlah sudu, luas penampang sudu dan sudu statis pengarah aliran angin, serta daya keluaran generator. Turbin angin tipe sumbu vertikal mengendalikan gaya drag maka daya yang dibangkitkan turbin naik ketika luas penampang sudu lebih besar dan akan lebih optimal ketika didukung oleh sudu statis pengarah aliran angin. Metode penelitian dengan melakukan pengujian perfomansi turbin angin sumbu vertikal tipe zephyr pada terowongan angin. Hasil dari eksperimen didapat daya turbin keluaran generator mencapai 48,95 Watt pada kecepatan angin 5 m/s.
Numerical Analysis of the Drag Coefficient on Energy-Efficient Vehicle Prototypes Hendry Sakke Tira; Muhammad Agus Muliawan; Syahrul Syahrul
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.46-51

Abstract

The focus of this investigation is to determine the drag coefficient on the prototype vehicle and also the pressure profile on the entire body of the prototype. The study was carried out on a prototype vehicle that would compete at Shell Eco-Marathon Asia-Pacific and Middle East 2023. The test was performed on an energy-efficient vehicle prototype built by the Mandalika Desantara Team, a team of mechanical engineering students at Mataram University. To accomplish this, a CFD approach simulation was performed using the Ansys 2023 R2 simulation software - fluent flow with a comparison of the drag coefficient and average pressure and wind speed of 30 km/h. According to the simulation results, the average drag coefficient value on the prototype design is 0.194. The highest average pressure can be detected on the front of the vehicle, where that part has a maximum pressure of 101374 Pa. While the airflow over the prototype body has the highest average speed of around 10 m/s. Based on these results, the prototype vehicle design still needs to be improved in order to compete in similar competitions.
Pengaruh Hybrid Interlayer Partikel Zinc Pada Friction Stir Spot Welding Material AA1100-AA5052 Lingga Arti Saputra
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.40-45

Abstract

Alumunium memiliki kelebihan dan sifat yang baik sehingga banyak digunakan di berbagai industry. FSSW merupakan metode yang mampu digunakan untuk menyambung alumunium, namun masalah hook defect dan key hole defect menjadi masalah tersendiri. Hybrid FSSW merupakan perpaduan Intrelayer Partikel Zinc dan Refill digunakan untuk mengatasai masalah defect pada sambungan. Hasil pengujian kekerasan hybrid FSSW memeiliki nilai kekerasan rata-rata 98.90HV pada SZ. Distribusi nilai kekerasan hybrid FSSW memiliki nilai yang lebih besar dari pada konvensional FSSW karena efek dua fase pengelasan. Hybrid FSSW memiliki nilai Tarik geser tertinggi 5.3 kN pada diameter shoulder 8mm 12s. Efek dua fase dan penambahan area ikatan akibat variasi diameter shoulder menjadi faktor peningkatan kemampuan sambungan

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