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INDONESIA
Rotasi
Published by Universitas Diponegoro
ISSN : 1411027x     EISSN : 24069620     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 676 Documents
 61   62   63   64   65 
Rancang Bangun Alat Germicidal Pembersih Virus Covid 19 di Udara Dengan Aliran Meander Dan Variasi Laju Udara Putra, Riki Candra; Rohman, Abdul
ROTASI Vol 26, No 1 (2024): VOLUME 26, NOMOR 1, JANUARI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.1.69-77

Abstract

Masa pandemi di Indonesia sudah berakhir dan saat ini masyarakat diberikan kebebasan untuk bersosialisasi lebih dekat, hal ini memungkinkan penyebaran virus covid 19 semakin meluas lagi meskipun masyarakat sudah diberikan vaksin. Penyebaran virus covid 19 dan mikroorganisme lainnya di udara perlu dikendalikan terutama pada ruangan tertutup yang berisi berbagai aktivitas manusia dengan menggunakan alat germicidal lampu UVC. Dengan menggunakan alat germicidal dengan sistel aliran meander dimungkinkan proses paparan sinar UVC ke virus menjadi lebih lama di dalam alat sehingga virus menjadi lebih cepat mati. Dengan bentuk aliran yang lebih kecil di dalam alat germicidal yang tertutup, bentuk aliran udara diharapkan menjadi lebih seragam. Dengan menggunakan tegangan yang berbeda yaitu 6 volt dan 12 volt didapat kecepatan aliran udara yang berbeda-beda karena adanya perbedaan besaran nilai antara kipas inlet dan outlet dengan suplai tegangan dari adaptor yang menghasilkan perbedaan rpm antara kipas inlet dan outlet yaitu kecepatan udara pada tegangan 6 volt memerlukan 13 kali sirkulasi udara untuk keluar masuk ke dalam alat sedangkan pada tegangan 12 volt memerlukan 23 kali sirkulasi untuk mendapatkan efektivitas pembasmian virus selama 30 detik. Aliran udara di dalam alat disimulasikan dengan menggunakan asap berwarna agar terlihat pergerakan udara dengan kondisi kaca akrilik yang masih bening atau belum tertutup oleh lapisan stiker. Setelah alat diuji, kotak dilapisi stiker berwarna untuk menjaga sinar UVC tidak terpapar keluar saat kipas dan lampu UVC dinyalakan.
Front Matter Rotasi Vol. 26 No. 2 April 2024 Sari, Ika Ayu Wulan
ROTASI Vol 26, No 2 (2024): VOLUME 26, NOMOR 2, APRIL 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.2.App. 1-4

Abstract

Front Matter Rotasi Vol. 26 No. 3 Juli 2024 Sari, Ika Ayu Wulan
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.App. 1-4

Abstract

A Hardware Implementation of SEPIC Converter Using ANFIS for Water Flow Control Adila, Ahmad Firyal; Sutedjo, Sutedjo; Mahendra, Luki Septya; Habibi, Muhammad Nizar; Rifadil, Mochammad Machmud; Putri, Ghodah Haifa
ROTASI Vol 26, No 2 (2024): VOLUME 26, NOMOR 2, APRIL 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.2.45-52

Abstract

Water resources are one of the needs for the continuation of life. The majority of people in Indonesia still use a manual water tank filling system, so it requires regular checks. Filling the water tank manually is ineffective because it requires turning on and off the pump first so the use of electrical energy is increasingly wasteful. In this research, a water flow control system was developed to fill water tanks, making it easier to use water both at home and in public facilities. This water flow control system uses a Single Ended Primary Inductor Converter (SEPIC) Converter as a DC motor pump supply voltage regulator. The SEPIC converter has the advantage of being able to increase and decrease the voltage value without changing the polarity. The duty cycle settings on the SEPIC converter are regulated using the Adaptive Neuro-Fuzzy Inference System (ANFIS) control method. The water flow control settings in this system use feedback from the water flow sensor by utilizing the hall effect. Based on simulations and implementation that have been carried out using MATLAB as well as hardware testing, at a set point value of 1.5 liters/minute the output voltage value is 3.9 V, and at a set point value of 3 liters/minute the output voltage value is 6.8 V. Implementation of ANFIS control has proven to be a solution for regulating voltage and has worked more efficiently on loads.
Pengaruh Fraksi Volume dan Ukuran Partikel Cangkang Telur Ayam terhadap Kekuatan Impak Komposit Polyester Iskandar, Ihsan; Wahyudi, Haris
ROTASI Vol 26, No 1 (2024): VOLUME 26, NOMOR 1, JANUARI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.1.21-27

Abstract

The eggshell of chicken, as a waste product from the food industry, has garnered attention in environmental sustainability efforts. In the context of composites, chicken eggshell offers the potential as an economical and sustainable reinforcement. The use of reinforcing materials in the form of particles is a common approach in composite development. Despite research on the use of chicken eggshell as a reinforcement in composites, the comprehensive effects of content and various particle sizes on unsaturated polyester composites using chicken eggshell on impact strength have not been thoroughly explained. This research aims to fill this knowledge gap by investigating the influence of content and particle size of chicken eggshell on the impact strength of unsaturated polyester composites. Composites were prepared using Polyester UPR 108 matrix reinforced with chicken eggshell that had been crushed into powder with various particle sizes of 40 mesh, 60 mesh, 80 mesh, and 100 mesh. The variation in the volume fraction of particles used was 0%, 10%, 30%, and 50%. The influence of particle size on composite performance was evaluated using Charpy impact strength testing according to ISO 179-1 standards. The research results showed that pure resin had the lowest impact strength, at 1.09 kJ/m2. Test specimens with 100 mesh particle content had the highest impact strength, at 4.25 kJ/m2. These findings indicate that composites with smaller particle sizes tend to have higher impact strength
Analisis Computational Fluid Dynamics (CFD) Winglet Pesawat Hercules C-130J TNI AU Ibrahim, Muhammad; Fauzi, Ahmad Hasan; Wahyudi, Hadi
ROTASI Vol 26, No 2 (2024): VOLUME 26, NOMOR 2, APRIL 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.2.38-44

Abstract

Winglet adalah ekstensi vertikal atau miring pada ujung sayap yang berfungsi untuk mengurangi gaya hambat induced drag dan meningkatkan performa aerodinamika sayap. Penelitian ini bertujuan untuk menguji pengaruh penambahan winglet pada sayap pesawat Hercules C-130J. Variasi yang dianalisis meliputi jenis winglet (canted dan blended) dan sudut cant (30°, 60°, dan 90°) terhadap lift performance sayap seperti koefisien angkat (CL) dan koefisien hambat (CD­). Analisis dilakukan menggunakan metode simulasi computational fluid dynamics (CFD) dengan perangkat lunak Ansys Fluent 2022 R1. Hasil menunjukkan bahwa winglet jenis blended pada sudut cant 30° merupakan yang terbaik, dengan meningkatkan rasio lift terhadap drag (CL/CD) sebesar 3.3% dan mengurangi pembentukan trailing vortices di ujung sayap.
Designing an Energy-efficient Prototype Vehicle by the Mandalika Desantara Racing Team Tira, Hendry Sakke; Nuarsa, I Made; Renaldy, Renaldy
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.44-49

Abstract

In order to participate in the international fuel-efficient vehicle competition, a team from the Mechanical Engineering department of Mataram University has prepared a prototype vehicle. The competition is The Shell Eco-Marathon, held at the International Pertamina Mandalika Circuit in Lombok in July 2023 and attended by several teams from abroad. For this purpose, the team has developed an energy-efficient prototype vehicle using a two-wheeler engine. The team has modified the two-wheeler engine to achieve more fuel-efficient consumption compared to conventional vehicles. The study involves checking the two-wheeler engine's condition, conducting engine startup experiments, and analyzing engine performance. The Mandalika Desantara racing team reduced the piston diameter to minimize the combustion chamber volume. The results of the engine modification on the prototype vehicle show a fuel consumption rate of 71.66 km/l when driving on the Mandalika circuit. However, this figure has not yet reached the desired level of efficiency, considering that the estimated fuel consumption of vehicles with conventional motor engines is around 40-50 km/l.
Implementasi Augmented Reality untuk Pelatihan Operator Mesin Boiler TWA-WTV 300/10 Trismianto, Devout Prakoso; Paryanto, Paryanto; Munadi, Munadi
ROTASI Vol 26, No 1 (2024): VOLUME 26, NOMOR 1, JANUARI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.1.1-14

Abstract

The aim of this research is to develop an augmented reality application system as a training or support for boiler engine operators in carrying out their activities. The augmented reality application system uses the head-mounted device Microsoft Hololens and environmental detection using markerless of the Vuforia target area, as well as the application integrated with the Blynk IoT platform. Based on the results of testing applications using the blackbox method, augmented reality applications can run according to the created scenarios. The results of the system usability scale (SUS) test conducted on 5 respondents, the expert staff obtained a score of 70.5, and 35 respondents of new users obtained a score of 70.8. The results of both groups of respondents can be categorized as grade C. Respondents also argued that the augmented reality application system developed for the operation of the boiler machine is categorized as OK and acceptable.
Front Matter Rotasi Vol. 26 No. 1 Januari 2024 Sari, Ika Ayu Wulan
ROTASI Vol 26, No 1 (2024): VOLUME 26, NOMOR 1, JANUARI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.1.i-v

Abstract

Prototyping Smart Maintenance System Berbasis Augmented Reality Untuk Steam Turbine Di PLTP Paryanto, Paryanto; Surya, Rizqi Diaz; Rusnaldy, Rusnaldy
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.31-42

Abstract

Augmented Reality adalah teknologi yang memiliki kemampuan untuk mengintegrasikan dan menghadirkan objek virtual ke dalam realitas fisik secara langsung. Penggunaan augmented reality dalam konteks perawatan dinilai dapat meningkatkan pemahaman para pekerja dalam memvisualisasikan proses perawatan dengan lebih mudah. Sehingga penulis tertarik untuk Prototyping Smart Maintenance System berbasis Augmented Reality untuk Steam Turbine di Pembangkit Listrik. Hal ini didasari oleh besarnya waktu, tenaga, biaya serta resiko yang dikeluarkan pada saat maintenance. Pada penelitian ini peneliti mengembangkan sebuah smart maintenance system berbasis augmented reality yangmudah untuk digunakan berbagaiorang. Pada aplikasi ini peneliti merancang aplikasi dengan 2 fitur yaitu fitur simulasi rangkaian Steam Turbine dan fitur manual Standar Operasional Prosedur (SOP). Pengujian fitur aplikasi meliputi pengujian simulasi Steam Turbine berbasis augmented reality pada fitur simulasi rangkaian Steam Turbine dan pengujian smart maintenance yang berisikan tata cara maintenance pada Steam Turbine pada fitur manual SOP. Pada pengujian fitur aplikasi yang sudah dibuat, didapatkan bahwa aplikasi dapat beroperasi dengan baik menggunakan protokol TCP/IP, sehingga visual simulasi rangkaian Steam Turbine dapat ditampilkan dengan baik. Pada pengujian fitur manual SOP didapatkan bahwa link yang berisikan tata cara maintenance Steam Turbine dapat digunakan dengan baik.

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