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Rando Tungga Dewa
Universitas Pertahanan Indonesia
Mechanical Engineering

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ANALISA STRUKTUR DAN PERFORMA IMPELLER POMPA SENTRIFUGAL DENGAN MENGGUNAKAN COMPUTATIONAL FLUID DYNAMIC AND FINITE ELEMENT METHOD Gunawan Dwi Haryadi; Ismoyo Haryanto; I.M.W. Ekaputra; Rando Tungga Dewa; Deka Setyawan
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.1199

Abstract

Centrifugal pumps are divided into two main components, namely the impeller and the volute. The impeller is a rotating pump component, while the volute is a stationary pump component. The current problem in the industrial world is that the pump capacity that operates is not in accordance with the written capacity so that the pump does not work optimally. In addition, the structural analysis of the pump is minimally carried out so that damage to the pump often occurs. To overcome this, it is necessary to analyze the performance and structure of the centrifugal pump design using computational fluid dynamics and static structural analysis methods on variations in the number of blades & impeller rotation speed. The results of the CFD analysis obtained are validated using existing product specifications and studies that have been carried out. The maximum value of the resulting von-mises stress is 20,238 Mpa, the maximum value of the resulting strain is 0.00010133, while the maximum total deformation value is 0.051984 mm. The three maximum values ​​occur in the variation of the 7 blade impeller with a rotational speed of 1800 rpm.
Proposed Novel Eco-Friendly Natural Fiber of Gnetum Gnemon for Military Grade Applications Bhiftime, Eka Irianto; Dewa, Rando Tungga; Pratomo, Arief Nur
Jurnal Rekayasa Mesin Vol 17, No 1 (2022): Volume 17, Nomor 1, April 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i1.2892

Abstract

This paper investigates a tensile strength and microstructure characterization of Gnetum gnemon as a newly proposed eco-friendly natural fiber for composites reinforcement. Natural fibers have recently become attractive to researchers, engineers and scientists as an alternative reinforcement for composites. It has relatively low cost, renewable (easily available), and biodegradable. The production system requires simple and energy-efficient equipment and can be exploited as a replacement for the conventional fiber, such as Kevlar for personnel protection. The strength of Gnetum gnemon was found to be comparable with existing new composites. The form of fiber was found to be depended on the lignin, hemicellulose, benzene, and other impurities, thus made it larger and not uniform. These results show great potential as a competitor to the predecessor natural fibers used in composite materials of armor materials, if given special chemical treatment to increase their initial mechanical properties.
Perancangan Mutakhir Material Propelan Padat dengan Metode Pembuatan Prototipe Cepat Rando Tungga Dewa; Aditia Aulia; Eka Irianto Bhiftime; Ariyo Nurachman Satya Permata; Ida Farida; Rashif Shiraj
Jurnal Rekayasa Mesin Vol 18, No 1 (2023): Volume 18, Nomor 1, April 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i1.3877

Abstract

Teknologi amunisi dan persenjataan sangat berkembang pesat. Kemajuan teknologi dalam pengembangan material propelan sangat berpotensi besar. Kepadatan material yang tinggi dari propelan padat menyebabkan kepadatan energi yang tinggi (Energi yang dihasilkan oleh satu unit massa propelan disebut dengan kepadatan energi) yang dibutuhkan untuk menghasilkan gaya propulsi yang diperlukan. Propelan pada roket dibakar secara terkendali (deflagrasi) untuk menghasilkan daya dorong yang diinginkan. Propelan padat terdiri dari beberapa bahan kimia seperti oksidator, bahan bakar, pengikat, plasticizer, curing agent, stabilizer, dan cross-linking agent. 3D printing telah muncul sebagai platform teknologi serbaguna untuk desain berbantuan komputer (CAD) dan manufaktur aditif (AM). AM memungkinkan produksi suku cadang yang disesuaikan dari logam, keramik, dan polimer tanpa memerlukan cetakan atau permesinan yang kompleks untuk fabrikasi formatif dan subtraktif konvensional. Jelas bahwa propelan padat komposit akan secara signifikan mendapat manfaat dari kendala geometris yang teratasi dan kemudahan pembuatan yang ditawarkan oleh teknologi 3D printing. Sampai saat ini, studi mengenai kelayakan material propelan padat dengan menggunakan metode pembuatan cepat belum pernah dilakukan di Indonesia. Pada penelitian ini, propelan komposit berbasis Potassium dipilih dengan matriks photocurable resin sebagai pengikat. Serbuk iron oxide halus ditambahkan pada komposisi propelan dipenelitian ini. Tujuan dari penelitian ini adalah untuk mengetahui performa dari material propelan padat yang dibuat dengan menggunakan teknologi pembuatan cepat atau 3D printer. Dari hasil penelitian ini diharapkan untuk memperoleh propelan padat tanpa residu bahaya, dengan geometri tertentu yang tidak dapat dibuat dengan cara tradisional, mudah memproduksi sejumlah kecil propelan dengan harga murah, dan pengurangan berat dari propelan dan komponen.
Fracture and Failure Analysis of Wheel Bolt on Main Landing Gear CN235 220M Aircraft Dewa, Rando Tungga; Daffa Mandala Adinata; Ida Farida; Sovyan Aritonang; Hadi Wahyudi
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i1.6291

Abstract

The wheel bolt of the CN235 220M aircraft is a type of fastener crucial for maintaining air pressure within the tire. It was discovered that this component fractured during operation. This study aims to conduct forensic analysis on the mechanism and causes of material failure through micro and macro morphological observations, chemical composition tests, microstructural analysis, and hardness testing on the fractured bolt. Micro-morphology results showed a crack tip in the initiation zone, which became a stress concentration point. Additionally, striations caused by cyclic loading were observed. EDS analysis revealed a high oxygen content in the initiation zone, indicating a corrosion-assisted crack. As cyclic loading continued, it gradually eroded the bolt's cross-sectional area until the material's fatigue led to final fracture.
A Comparative Analysis of Epoxy Coating Quality on ASTM AH-36 Steel Plates Using Surface Preparation Methods Hidayat, Rahmat; Dewa, Rando Tungga; Utomo, Thaha Yassin Ramadhan; Rizky, Muhammad; Ramadhan, Mariyan Maritza; Kristiyono, Leander Berliano Farel; Rofiq, Ainur
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7507

Abstract

The shipping industry, vital to the global economy, faces significant challenges due to corrosion in marine environments, particularly affecting steel structures like AH36 grade used in ships. This study investigates the effectiveness of two surface preparation methods—Abrasive Blast Cleaning and Power Tool Cleaning—on the adhesion of epoxy coatings, which are essential for enhancing corrosion resistance. Employing ASTM standards, we assessed surface roughness and adhesion strength, revealing that Abrasive Blast Cleaning produced a superior average roughness of 106.34 µm compared to 17.67 µm from Power Tool Cleaning. The Tape X-Cut test further demonstrated that the former achieved a perfect adhesion rating of 5A, while the latter only reached 4A, indicating slight peeling. These findings underscore the critical role of surface preparation in optimizing coating performance, suggesting that adopting Abrasive Blast Cleaning can significantly extend the lifespan and operational efficiency of both commercial and military vessels. This research not only addresses the urgent need for improved protective measures in the shipping sector but also contributes to reducing economic losses attributed to corrosion, estimated at 3-4% of GDP annually.
Co-Authors Aditia Aulia Ainur Rofiq Ariyo Nurachman Satya Permata Daffa Mandala Adinata Deka Setyawan Gunawan Dwi Haryadi Hadi Wahyudi I Made Wicaksana Ekaputra Ida Farida Ida Farida Ismoyo Haryanto Kristiyono, Leander Berliano Farel muhammad rizky, muhammad Pratomo, Arief Nur Purwoko, Agus Rahmat Hidayat Ramadhan, Mariyan Maritza Rashif Shiraj Sovyan Aritonang Utomo, Thaha Yassin Ramadhan