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Rotasi
Published by Universitas Diponegoro
ISSN : 1411027x     EISSN : 24069620     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 676 Documents
 64   65   66   67   68 
COMPARATIVE ANALYSIS OF NOISE, EMISSION, AND PERFORMANCE OF SHIJIRO RACING EXHAUST WITH STANDARD EXHAUST ON A 2020 VESPA SPRINT 150 I-GET Sutisna, Nanang Ali; Ramadhan, Ibnu Abil
ROTASI Vol 27, No 2 (2025): VOLUME 27, NOMOR 2, JULI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.2.49-63

Abstract

This article presents a comprehensive comparative study of the standard and Shijiro Standard Racing exhaust systems on a 2020 Vespa Sprint 150 i-GET. This study aims to evaluate the efficacy of the exhaust system. The research objectives include a comparison of motorcycle performance, noise production and exhaust emissions, with adjustments made in accordance with Indonesian laws and regulations. The study also examines the airflow of the exhaust gas using Computational Fluid Dynamics (CFD) simulations. Testing procedures were conducted on the 2020 Vespa Sprint 150 i-GET, utilizing both standard and racing exhaust systems. These tests included performance, noise, and emission tests, conducted using a dynamometer, decibel meter, and gas analyzer, respectively. The data collected from these tests were analyzed to provide a comprehensive comparison between the standard and racing exhaust systems. The result is that even though it makes a louder sound, the racing exhaust still meets noise regulations in Indonesia. Both exhaust types met emission standards. The performance results revealed that standard exhausts outperformed in horsepower, while racing exhausts excelled in torque. The study also involved the use of reverse engineering to analyze the airflow in the exhaust and obtain design, dimension, and size information. The CFD simulations confirmed the influence of exhaust construction on sound, performance, and emissions. This research provides valuable insights into the performance of standard and Shijiro standard racing exhaust systems, contributing to the body of knowledge in this field. 
Pembuatan Perangkat Portabel untuk Penanggulangan Banjir dengan Monitoring Real-Time Ketinggian Air Sungai Berbasis IoT Endriantono, Dafit Ody; Syakirudin, Thofail; Rifat, Ahmad Miftahur; Novaliyanto, Zanuar Dwi; Kemal Pasya, Moch Raihan; Zaky, Asyraf Sulthan; Mahardhika, Yesta Medya; Habibi, Muhammad Nizar
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.%p

Abstract

Bencana banjir merupakan tantangan hidrometeorologi paling signifikan di Indonesia, menyebabkan kerugian sosial-ekonomi yang besar dan mengancam keselamatan jiwa. Sistem peringatan dini yang ada seringkali terkendala oleh keterlambatan informasi, jangkauan terbatas, dan ketergantungan pada infrastruktur konvensional. Penelitian ini bertujuan merancang, membangun, dan menguji "FLOPRO", sebuah sistem peringatan dini banjir yang portabel, mandiri energi, dan berbasis Internet of Things (IoT). Metodologi pengembangan sistem ini mengintegrasikan mikrokontroler ESP32 sebagai unit pemrosesan utama, sensor ultrasonik HC-SR04 untuk pengukuran ketinggian air secara non-kontak, dan sistem catu daya mandiri yang terdiri dari panel surya 5V, modul pengisi daya TP4056, serta baterai LiPo. Data pengukuran ditransmisikan secara real-time ke cloud server melalui protokol Message Queuing Telemetry Transport (MQTT) yang ringan dan efisien. Sistem ini menyediakan mekanisme peringatan melalui peringatan suara lokal melalui modul ISD1820 untuk respons komunitas yang cepat. Hasil pengujian prototipe dalam lingkungan laboratorium terkontrol menunjukkan kinerja yang sangat andal. Validasi sensor HC-SR04 menghasilkan tingkat kesalahan rata-rata di bawah 3%. Transmisi data melalui MQTT menunjukkan latensi end-to-end yang rendah dengan keandalan pengiriman pesan yang tinggi. Sistem catu daya surya terbukti mampu menjaga operasional perangkat secara kontinu. Dapat disimpulkan bahwa perangkat FLOPRO berhasil divalidasi sebagai solusi EWS banjir yang efektif, portabel, dan efisien energi, dengan potensi besar untuk meningkatkan kesiapsiagaan masyarakat terhadap bencana banjir.
Kinerja Mesin Air-Water Harvetser dengan Dua Koil Evaporator Mirmanto, Mirmanto; Syahrul, Syahrul; Sutrisno, Ahsani
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.8-13

Abstract

In the dry season, certain areas have difficulty obtaining water for cooking or drinking. Therefore, it is necessary to present an air water harvester (AWH) machine to harvest water from the air. However, this machine is still limited in production. Various forms of evaporators have been applied to increase the productivity of water, but the machine has not yet produced sufficient water. This study examined the performance of AWH machines with two coil-shape evaporator. The performance mentioned here were the mass of water produced and the heat transfer rate from the air to the evaporator walls. In the open literature, no study like this has been found. This 2-coil evaporator in this study were tested with variations in incoming air velocity of 4 m/s, 5 m/s and 6 m/s with natural environmental conditions. The machine power used was 1 PK or 746 W.  The results of this study show that the maximum water mass produced was 1.46 kg and the heat transfer rate was 360 W obtained the inlet air velocity of 5 m/s. So the increase in speed does not necessarily increase the mass of water and the heat transfer rate occurs.
Analysis Of The Influence Of Spindle Speed And Feed Rate On The Surface Quality Of The CNC Lathe Machining Process Using SS400 Material With Taguchi Method Sutisna, Nanang Ali; Al Grage, Fathir Fajaryanto
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.14-21

Abstract

The CNC lathe machining process is one of the choices in the manufacturing industry. The CNC lathe machining process usually makes machine components that are either flat or cylindrical. This process has a principle, namely a process of forming the outer and inner surfaces of the material by rotating the workpiece and then meeting it with a cutting tool with an axis parallel to the workpiece. A CNC lathe is a machine that can move a cutting tool by receiving command data and then processing it. This study will show the effect of variations in spindle rotation speed and also variations in feed rate on the CNC Lathe Liouy Hsing 450 machine on the surface quality of the workpiece. In this study, SS400 steel and WNMG-type cutting tools were used as fixed variables, with variations in spindle speed of 800, 1000, and 1200 rev/min and feed rates of 0.1, 0.2, and 0.3 mm/min. The methods that will be used are experiments and statistics, then data collection will be carried out using observation and documentation methods. The data that has been obtained will be processed using Microsoft Excel. This study concluded that feed rate has a greater influence than spindle speed, and the fourth experiment at a spindle speed variation of 1000 rev/min and a feed rate of 0.1 mm/min had the smoothest surface roughness value of 0.487µm.
Characterization of Bed Agglomeration in Circulating Fluidized Bed Boilers: Influence of Coal Quality and Bed Material Interactions Cahyo, Nur; Triasdian, Yayak; Busairi, Achmad; Rahmanta, Mujammil Asdhiyoga; Paryanto, Paryanto; Fajar TK, Berkah
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.22-29

Abstract

The utilization of coal in generating energy across the world is extremely popular due to its low cost. Otherwise, coal quality plays a significant role in other potential problems. Such an interaction between bed material and coal properties could lead to the formation of bed agglomeration, which melts in the CFB boiler of a power plant. The result shows that the majority of agglomeration samples were granular and dominated by round shapes, as observed visually. The EDX analysis shows that the three biggest elements in the agglomeration sample are oxygen, silica, and calcium. Meanwhile, XRD analysis reveals that the most reactive products were muscovite, albite, and dolomite compounds. They were composed of natrium in the range of 1.95–2.84%, silicon in the range of 20.2–21.16%, aluminium in the range of 13.05–15.46%, calcium in the range of 1.05–3.11%, and others. Therefore, several potential alternatives might be the best way to reduce the risk of agglomeration in a boiler. Including using additives like china clay and soils, especially those containing kaolin, and utilizing alternate bed materials. Another promising option to prevent this problem is to reduce the combustion temperature and replace bed material periodically.
Analisis Sifat Mekanis RTV Silicone Rubber dengan Variasi Silicone Oil untuk Pengembangan Injection Training Arm Romadhon, Saeful Rofi; Ismail, Rifky; Bachtiar, Yuriz; Prawibowo, Hartanto
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.30-39

Abstract

RTV silicone rubber is widely used in medical simulation devices because of its properties that resemble human soft tissue, especially in injection training arms that require elasticity, tensile strength, tear resistance, and adequate hardness to withstand repeated needle penetration. This study aims to evaluate the effect of adding silicone oil on the mechanical properties of type 00A RTV silicone rubber through tensile testing (ISO 37:2024), tear testing (ISO 34-1:2022), and hardness testing (ASTM D2240). Three formulations were tested, namely pure RTV, RTV + 5 phr silicone oil, and RTV + 15 phr silicone oil. The results showed that the addition of 5 phr silicone oil produced the most significant improvement in mechanical properties, with a tensile strength of 0.57 N/mm², elongation of 363.4%, tear resistance of 0.42 N/mm, and hardness of 9.3 Shore A, compared to pure RTV which only reached 0.38 N/mm², 199.26%, 0.33 N/mm, and 7.2 Shore A. Conversely, the addition of 15 phr silicone oil reduced performance due to excessive plasticization, although the hardness value still increased to 9.9 Shore A. Thus, the 5 phr silicone oil formulation is recommended as the optimal composition for realistic and economical injection training arm applications.

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