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All Journal International Journal of Science and Engineering (IJSE) TEKNIK Rotasi JURNAL TEKNIK MESIN Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Prosiding SNATIF International Journal of Applied Technology Research Majalah Ilmiah Gema Maritim Automotive Experiences Jurnal Polimesin
Sri Nugroho
Department Of Mechanical Engineering, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Design of Hybrid Energy System for Railway Application (Case Study of People Mover System in Doha, Qatar) Nugroho, Sri; Mauludin, Luthfi Muhammad; Sirait, Togar; mujiman, mujiman; Sofyan, Ahmad; Tohir, Toto
Jurnal Internasional Penelitian Teknologi Terapan Vol 4 No 1 (2023): April 2023
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v4i1.112

Abstract

This paper presents the conceptual design of hybrid energy system used in railway application. The hybrid system with batteries and energy storage double-layer capacitor is a new technology that is used under extreme climatic conditions, especially in daytime temperature up to 50°C, high relative humidity, dust and heavy rain. It is a combination of double-layer capacitors and traction batteries. It draws power both externally and from braking energy. In order to reduce CO2 emissions to the environment, energy-saving drives and energy storage are used. Also, in public transportation, Sitras Hybrid Energy System (HES), hybrid energy storage system for trams, has been developed which combines a double-layer capacitor with a nickel-metal hydride battery. The storage not only allows driving without overhead lines, it also enables braking energy to be recovered. A reliable cooling system is required to ensure that the performance of the battery and the capacitor storage is maintained for as long as possible. The results of finite element model showed the robustness for railway application. The computational model refers to proof of static and dynamic strength in accordance with EN12663. A cooling system for a tram using this innovative technology was designed and qualified for the "Qatar Education City People Mover System (PMS)" project.
ANALISIS VON MISES STRESS PADA BIOMATERIAL PENGGANTI DISKUS INTERVERTEBRALIS MENGGUNAKAN METODE ELEMEN HINGGA Sinarpaska, Steven Yordan; Nugroho, Sri; Jamari, Jamari
JURNAL TEKNIK MESIN Vol 12, No 2 (2024): VOLUME 12, NOMOR 2, APRIL 2024
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Nyeri pada tulang belakang menjadi salah satu penyakit yang biasa diderita orang dewasa pada punggung bagian bawah. Nyeri ini bisa menjalar ke bagian bawah paha, terutama pada sisi posterior-lateral hingga ke lutut dan dapat menyebabkan penurunan performa dalam beraktivitas. Penyakit ini biasa disebabkan oleh degenerasi intervertebralis (IVD), dimana gerakan segmen tulang belakang menjadi tidak normal. Salah satu penggunaan biomaterial pada dunia medis ialah pembuatan implan penggantian diskus total sebagai salah satu metode untuk mengatasi penyakit degenerasi diskus. Hal ini dapat mengembalikan gerakan tulang belakang, menyerap getaran antar tulang belakang, serta memulihkan ketinggian antar ruas tulang belakang yang menurun akibat penyakit degenerasi diskus. Berbagai biomaterial dikembangkan diantaranya stainless steel 316L, ultra-high-molecular-weight polyethylene (UHMWPE), polyetheretherketone (PEEK), dan carbon fiber-reinforced-polyetheretherketone (CFRPEEK) sebagai implan pengganti diskus. Simulasi analisis elemen hingga dilakukan untuk mengetahui kemampuan diskus pada model lumbal 1 hingga lumbal 2 dengan pemberian beban 500 N – 2500 N menggunakan aplikasi Ansys. Hasil yang diperoleh menunjukkan peningkatan nilai von mises stress pada material stainless steel 316L, CFRPEEK, dan PEEK dengan inlay UHMWPE. Dimana nilai peningkatan memiliki presentase yang sama pada setiap pembebanannya. Desain PEEK sebagai superior/ inferior endplate dengan inlay UHMWPE menjadi material rekomendasi yang dapat digunakan sebagai implan pengganti diskus invertebralis ditinjau dari persentase peningkatan nilai von mises stress paling rendah dibandingkan material lain.
MECHANICAL ANALYSIS ON HEAVY DUTY ROLLER Prasetyo, Adzan Jati; Nugroho, Sri; Ismail, Rifky
JURNAL TEKNIK MESIN Vol 12, No 2 (2024): VOLUME 12, NOMOR 2, APRIL 2024
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Mechanical analysis is a critical aspect of engineering that aims to understand the root causes of component failures and develop strategies to prevent future occurrences. This thesis presents a comprehensive failure analysis of heavy-duty rollers used in industrial applications, focusing on identifying the mechanisms that lead to their premature failure. Heavy-duty rollers are subjected to extreme operational conditions, including high loads, varying speeds, and harsh environmental factors, making them prone to wear and failure. The study involved a detailed examination of failed roller samples using various analytical techniques, including visual inspection, metallurgical analysis, scanning electron microscopy (SEM). The results revealed that the primary failure mechanisms were fatigue, abrasive wear, and improper lubrication. Fatigue failures were characterized by the presence of micro-cracks that propagated over time due to cyclic loading. Abrasive wear was identified through the examination of surface topography, indicating that particles entrapped between rolling surfaces led to significant material removal. Additionally, improper lubrication was found to exacerbate both fatigue and wear by increasing friction and thermal stresses. The analysis also highlighted several contributing factors to these failure mechanisms, such as material defects, manufacturing inconsistencies, and inadequate maintenance practices. Metallurgical analysis indicated the presence of non-metallic inclusions and improper heat treatment as significant factors compromising the material integrity. These include material selection enhancements, optimized heat treatment processes, improved lubrication strategies, and rigorous maintenance protocols. Implementing these recommendations is expected to significantly reduce the failure rate and extend the operational lifespan of heavy-duty rollers in industrial settings. This study underscores the importance of a systematic approach to failure analysis and provides a framework for addressing similar issues in other critical components. The insights gained from this research contribute to the broader field of reliability engineering and have practical implications for industries relying on heavy-duty roller systems.
STUDI PENDAHULUAN REKONSTRUKSI DAN MESH TULANG LUMBAR 1 SAMPAI 2 MENGGUNAKAN METODE FINITE ELEMENT Arif, Iqbal Nur; Nugroho, Sri; Jamari, Jamari
JURNAL TEKNIK MESIN Vol 12, No 2 (2024): VOLUME 12, NOMOR 2, APRIL 2024
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Tulang lumbar memegang peran penting dalam menunjang aktivitas manusia sehari-hari. Untuk mengkaji permasalahan yang ada pada tulang lumbar metode komputasi hingga (Finite Element Analisys) menjadi salah satu solusi yang optimal untuk mengetahui fenomena yang terjadi. Pada penelitian ini dilakukan studi pendahuluan mengenai rekonstruksi dan mesh dengan fokus pada lumbar satu sampai dua. Proses rekonstruksi dilakukan dengan memanfaatkan software Mimics, Solidwork, dan Ansys sedangkan untuk studi meshing sendiri dimulai dengan nilai ukuran mesh yang lebih besar ke kecil. Berdasarkan rekonstruksi yang dilakukan didapatkan model lumbar yang memiliki bagian berupa cortical bone, cancellous bone, annulus, dan ligamen. Sedangkan nilai mesh optimum yang didapatkan adalam 3 mm dengan nilai presentase perubahan kurang dari 2%.
Evaluation of stress–relieving heat treatment on mechanical properties and microstructure of friction-welded JIS S45C steel Susanto, Alexander Eka; Haryadi, Gunawan Dwi; Haryanto, Ismoyo; Sulardjaka, Sulardjaka; Nugroho, Sri; Ekaputra, I Made Wicaksana
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6522

Abstract

This research evaluates the effect of stress-relieving post-weld heat treatment (PWHT) on the mechanical properties and microstructure of friction-welded JIS S45C steel joints. The PWHT was conducted at 500 °C for 1 hour. Tensile and Vickers microhardness tests were performed on both as-welded and heat-treated specimens. The tensile tests showed that fracture consistently occurred in the base metal, confirming good weld quality. Stress-relieved specimens showed a 3% increase in elongation compared to the as-welded condition, indicating improved plasticity. The Vickers microhardness tests revealed around 10% decrease in hardness at the weld center zone (from 293 HV to 267 HV) and heat-affected zone (from 245 HV to 224 HV) after treatment. Metallographic observation indicated coarsening of the pearlite phase due to thermal exposure.
Co-Authors . Jamari . Jamari A. D. Cahyono Achmad Widodo Ahmad Sofyan Alfian Hakim Dwi Atmaja AP, Bayuseno Arif, Iqbal Nur Aryo Aryo Atanasius Priharyoto Bayuseno Bakti Sofyarto Basmal Basmal Deri Dagi Wacono, Deri Dagi Dosma Ruben R Nababan Eflita Yohana F Adnan Fachri Maulana Putera Fitriyana, Deni Fajar Gregorius Sasongko Gunawan Dwi Haryadi Haidar Akbarsyah Harlian Kadir Hendrikus Kedo Senoaji I Made Wicaksana Ekaputra Insannul Fikri Ismoyo Haryanto J. Jamari Januar Parlaungan Siregar Kim Jeon Lilin Hermawati M. Aziz Fauzi Mauludin, Luthfi Muhammad Moh Fawaid Mohammad Tauviqirrahman Muhammad Fajrur Rochmat Mujiman Mujiman, Mujiman Mujiono - Nana Supriyana Norman Iskandar Novi Andrianto Petrus Londa Poedji Haryanto Prasetyo, Adzan Jati Raharjo, Fuad Arief Rifky Ismail Riski Maulana Ronald Sabtendra Rusnaldy Rusnaldy Sinarpaska, Steven Yordan Sirait, Togar Sugeng Tirta Atmaja Sugiyarta Sugiyarta Sulardjaka - Sulardjaka Sulardjaka Susanto, Alexander Eka Susilo Adi Widyanto Suyanto - Syaiful . Syamsul Arifin Tezara Cionita Thesar Aditya Nurcholis Tony Suryo Utomo Toto Tohir Wahyu Krisna, I Putu Gde Wahyu Setia Aji Wiko Sudiarso Wilastari, Santhi Wiwik Handayani Yonathan Jalu Bagaskara Yusuf Umardani Yusuf Umardhani