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All Journal Rekayasa Mesin Mesin International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Jurnal Kepariwisataan International Journal of Aviation Science and Engineering Jurnal Nasional Aplikasi Mekatronika, Otomasi dan Robot Industri (AMORI) Journal of Social Research Jurnal Ilmiah MEA (Manajemen, Ekonomi, dan Akuntansi) Prosiding SNTTM Indonesian Journal of Aerospace
Leonardo Gunawan, Leonardo
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Transportation Other

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The Influence of Forming Effects on The Bending Crush Behavior of Top-Hat Thin–Walled Beams Santosa, Sigit Puji; Nhat Vu, Nguyen Van; Gunawan, Leonardo; Jusuf, Annisa
Mesin Vol 25, No 2 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (618.036 KB)

Abstract

This paper presents a study on the effects of forming process of a top–hat thin–walled beams to its bending crush resistance under dynamic bending load. The thin–walled beam was formed using a one step deep drawing. HyperForm software simulated the forming process and mapped its effects such as thickness variations and residual plastic strains in to the crash analysis models. Then the dynamic bending crush analysis was carried out using LS–DYNA by using the geometry and materials data obtained from the forming analysis results. For each material model, the analyses were carried out for model with and without the forming effects. The bending crush behavior of the top–hat thin–walled beams were then analyzed to compare between the simulations with and without forming effects. The results show that by incorporating the effect of forming process, the bending crush resistance of the thin–walled  beams is increase by 4.7%. The introduction of strain rates to the material model increases even further on the bending crush resistance of the thin–walled  beam.
Karakterisasi Sifat Mekanik Mild Steel St37 dan High Strength Steel CR420LA pada Laju Regangan Menengah Gunawan, Leonardo; Dimas, Agustinus; Jusuf, Annisa; Dirgantara, Tatacipta; Putra, Ichsan Setya
Mesin Vol 25, No 2 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (681.695 KB)

Abstract

Untuk mendapatkan prediksi respon yang cukup akurat dalam analisis tabrakan kendaraan darat, dimana terjadi pembebanan dan deformasi struktur dalam waktu yang cepat, diperlukan data sifat mekanik material pada berbagai laju regangan. Makalah ini menyajikan pengukuran sifat mekanik Mild Steel St37 dan High Strength Steel CR420LA pada kondisi kuasi-statik dengan laju regangan 0.001 s-1 dan pada kondisi dinamik dengan laju regangan 0.1 s-1, 1 s-1, 10 s-1, dan 100 s-1. Dalam pengujian, data beban terhadap waktu direkam menggunakan load cell, sedangkan data perpindahan terhadap waktu diperoleh menggunakan ekstensometer untuk uji kuasi-statik dan menggunakan kamera kecepatan tinggi diikuti dengan perhitungan regangan berdasarkan metode Korelasi Citra Digital (KCD) untuk kondisi dinamik. Hasil pengukuran menunjukan bahwa baja St37 dan CR420LA termasuk ke dalam jenis material yang sensitif terhadap laju regangan, dimana tegangan luluh material meningkat dengan naiknya laju regangan pada material.
The Influence of Sheet Metal Forming on The Axial Crushing Analysis of Top–Hat Columns Santosa, Sigit P; Tam, Le Hoai; Gunawan, Leonardo; Jusuf, Annisa
Mesin Vol 25, No 1 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (889.555 KB) | DOI: 10.5614/MESIN.2016.25.1.4

Abstract

Reducing the rate of casualty in the crash events is always on the top priority of car manufacturers and customers. It is therefore necessary to make accurate predictions of car structural behavior during the crash events. To achieve this goal, the axial crushing behavior of the thin-walled top hat column needs to be understood thoroughly so that the crashworthiness performance of the column can be predicted accurately. The effect of sheet metal forming should be considered since many car crashworthiness components are fabricated by sheet metal forming. This paper presents a numerical study to investigate sheet metal forming effects such as: thickness distribution, residual stress and plastic strain change to the crushing force characteristics of the top-hat columns. First, the design of the top-hat column was generated by using deep drawing forming process simulation. Then, the forming parameters (geometry, residual stress, plastic strain, thickness distribution) were transferred to the non-linear finite element dynamic analysis model. The axial crushing simulations for the top-hat column with forming parameters were then performed and analyzed. The results showed that the sheet metal forming has a considerable effect on the crush behavior and performance of the thin-walled top-hat columns.
Railway track width gauge performance review: evaluation of test results and their implications for safety improvement Prasetyo, Febrian Angga; Sunarto, Setio Aji; Suprijanto, Suprijanto; Gunawan, Leonardo
Jurnal Nasional Aplikasi Mekatronika, Otomasi dan Robot Industri (AMORI) Vol 3, No 1 (2024): June
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27213560.v3i1.20269

Abstract

The deteriorated state of the railway line poses operational risks for railway transportation due to potential safety concerns. The train derailment occurred because of an abnormal track width that was not immediately repaired. This improvement was omitted because of the absence of an accurate and real-time track width measurement tool. Several gauge have been widely developed. The measuring instrument developed uses an LMP (Linear Motion Position) sensor to measure the width of the path. The measuring mechanism connects the LMP shaft to a roller bearing arm that can move linearly and dynamically according to the groove width of the path. The linear movement of the roller bearing with the arm connected to the LMP shaft is converted as a change in the path width. To determine the function and measurement results of the measuring instrument, measurement experiments were conducted at Sidotopo stations (lines 5 and 6). Line 5 was chosen because of the straight area of the money order needle, the parallel crossing groove, and the curve. Line 6 was chosen because there is a gongsol path. Measurements on each path are made twice with the starting point and opposite direction. The measurement data are shown in the form of a width graph to the distance with one red line as the tolerance limit for widening the width of the line (1074 mm) and one blue line as the tolerance limit for narrowing the width of the line (1065 mm). The measurement results show the consistency of the measurement results. The largest measured width condition is 1092 mm, and the smallest measured width condition is 1058 mm. 
REVIEW ON RAMS ANALYSIS FOR RAILWAY VEHICLES WITH POTENTIAL APPLICATION IN RAILWAY SYSTEM OF INDONESIA Muzakki, Sofyan; Gunawan, Leonardo; Rachman Setiawan; Kariem, M. Agus
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1781

Abstract

Railway vehicles are critical for ensuring the reliability and safety of trains, and their complexity has grown with technological advancements. RAMS analysis (Reliability, Availability, Maintainability, and Safety) has become a popular method for assessing the functional requirements of these vehicles. This review specifically investigates RAMS analysis for railway vehicles, aiming to identify trends, developments, key research challenges, and potential application in railway system of Indonesia. By thoroughly reviewing relevant articles, it explores various aspects of RAMS analysis, conducts comparative analyses, discusses potential research directions, and highlights advancements and usage in railway vehicle contexts. The methodology involves formulating research questions, searching the Scopus database for records, and applying assessment criteria to select eligible articles. Results reveal recent developments, distribution of articles, and studies focusing on reliability, availability, maintainability, and safety. This review offers valuable insights into the current state of RAMS analysis for railway vehicles and guides future research and development in this area.
MECHANICAL ANISOTROPY OF COLD-ROLLED ST-37 STEEL PLATE UNDER HIGH STRAIN RATES LOADINGS Perkasa, Rilis Eka; Gunawan, Leonardo; Santosa, Sigit Puji; Afdhal, Afdhal
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 2 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.02.9

Abstract

Cold rolling process in metal could increase its strength and hardness, but also induces mechanical anisotropy. This is caused by unresolved plastic strain and microstructural changes caused by plastic deformation exerted by pair of rolls at a relatively low temperature. This research aims to provide understandings on anisotropic and strain rate sensitive behaviour of St-37 mild steel. The microstructure of rolled and unrolled St-37 plate were observed in 3 directions relative to the rolling direction. The cylindrical specimens were then prepared from rolled plate with 33.3% reduction in the orientation of 0o, 45o, and 90o relative to the rolling direction. Specimens were also prepared from unrolled plate as comparison in the same directions. These specimens were then tested in compression loading, first in quasi-static condition, and then by using Split-Hopkinson Pressure Bar (SHPB) at the strain rate of 1200 s-1. The experimental results in the form of stress-strain curves are used to obtain the parameters of Simplified Johnson-Cook viscoplastic model. The anisotropy of yield strength in rolled specimens could be seen on both quasi-static and high strain rate condition, where the highest strength found on the specimens perpendicular to the rolling direction. In addition, the effect of cold rolling to the strain rate sensitivity of the material were also captured successfully in this study, where specimens from rolled plate show less strain rate sensitivity compared to the unrolled specimens.
Optimizing crash box design for enhanced vehicle safety: A Gaussian process regression approach Jarwadi, Maulana Hayu; Jusuf, Annisa; Palar, Pramudita Satria; Gunawan, Leonardo
Prosiding SNTTM Vol 21 No 1 (2023): SNTTM XXI Oktober 2023
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/pqbt8a56

Abstract

Transportation is a fundamental human need that permits mobility, allowing for economic, social, and cultural advancements. The crash box structure, a vital component for crashworthiness, is designed to deform during car collisions to absorb considerable impact energy plastically. This design concept attempts to prevent potential injuries to drivers and passengers. Crash boxes are constantly being developed to optimize their configuration to match needed crashworthiness features. The mean crushing force (Pm), crushing force efficiency (CFE), and specific energy absorption (SEA) are the critical crashworthiness variables that are calculated. With the advancement of data modeling tools, better crash box design can be achieved by revealing recognizable patterns and trends inherent in the data. To that end, this research uses LS-DYNA software to perform a numerical simulation of a hexagonally designed crash box that impacted under axial loading. The simulation includes the variation of thickness and perimeter of the crash box. Following the simulation, the data is modeled using the Gaussian Process Regression (GPR), often known as Kriging. This modeling approach yields surface and contour plots that show the impacts of thickness and perimeter on crashworthiness performance. The results show that the Pm value increases as the structure's thickness and perimeter increase. In comparison, the SEA and CFE values increase when the structure's thickness increases while the perimeter decreases. In summary, the simulation results show that the crash box with a thickness of 3 mm and a perimeter of 400 mm has the highest Pm value. In contrast, the crash box with a thickness of 3 mm and a perimeter of 120 mm achieves the highest CFE and SEA values.
Sustainable Event Policy Research Review In Bali: An Integrative Literature Review Framework For Environmental And Socioeconomic Integration Gunawan, Leonardo
Journal of Social Research Vol. 4 No. 7 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i7.2655

Abstract

Bali's heavy reliance on tourism, particularly in the events and MICE sector, has led to growing environmental degradation, water insecurity, and socio-cultural tensions. Despite policy efforts like the Bali Tourism Levy and the Regenerative Bali Program, fragmented governance and limited integration of local customs hinder sustainable outcomes. This study aims to develop an integrative policy framework for sustainable event management in Bali that harmonizes environmental conservation, socioeconomic equity, and cultural resilience. Utilizing an integrative literature review methodology grounded in the Theory, Context, and Methodology (TCM) framework, the study synthesizes peer-reviewed research from the Scopus database to examine the interactions among event policies, ecological systems, and stakeholder dynamics. Findings reveal that event policies often neglect traditional ecological knowledge and fail to equitably distribute benefits, exacerbating environmental strain and cultural erosion. However, initiatives incorporating Balinese philosophies such as Tri Hita Karana—and involving local stakeholders like subak and banjar councils—demonstrate improved environmental stewardship and economic outcomes. The proposed framework incorporates participatory governance models (e.g., Learning & Action Alliances), mandatory sustainability certifications, and community-led monitoring systems to synchronize ecological limits with social and cultural priorities. This research contributes to theory by advancing a Quadruple Bottom Line model that fuses cultural resilience into socio-ecological governance and suggests pathways for replicable, culturally embedded policy design in other tourism-dependent island settings.
Active Vibration Control of a Flexible Spacecraft Structure Agung, Rizqy; Kusni, Muhammad; Adhy Sasongko, Rianto; Eko Poetro, Ridanto; Gunawan, Leonardo; Akbar, Mahesa
International Journal of Aviation Science and Engineering - AVIA Vol. 6 No. 2: (December, 2024)
Publisher : FTMD Institut Teknologi Bandung

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Abstract

In this paper, the spacecraft that evaluated has two motion mode, rigid body mode and flexible mode and it isoperated in low earth orbit. The rigid body mode is related to the attitude of spacecraft and flexible mode is relatedto vibration that occurs on the spacecraft structure. The vibration that occurs on the spacecraft structure may causeperformance degradation during operation. Hence, the active control vibration is applied to overcome the problemdue to the vibration phenomenon on spacecraft. The active control system was designed by using two methods,Pole-Placement Method and Linear Quadratic Regulator (LQR) Method, and those two methods are solved byusing numerical method. The result of Pole-Placement Method shows the vibration is reduce in less than 0.5 unitof time. Whereas, the most suitable control parameter input based on the LQR Method could reduce vibration inless than 8 unit of time. The LQR method provides more parameter variation; thus, the system could be controlledand adjusted due to its design requirement. Based on the LQR Method when the attenuation time is 8 unit of time,the energy required by the actuator is 84% less than that of the Pole-Placement Method.
REVITALIZING CULTURE THROUGH NOCTURNAL TOURISM IN YOGYAKARTA: TRENDS, STAKEHOLDERS, AND A CONCEPTUAL FRAMEWORK Christianto, Jery; Gunawan, Leonardo
JURNAL KEPARIWISATAAN Vol 24 No 2 (2025): Jurnal Kepariwisataan
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat Politeknik Pariwisata Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52352/jpar.v24i2.2070

Abstract

This study explores the evolving phenomenon of nocturnal tourism and its strategic role in revitalizing cultural and artistic expressions, with a specific focus on Yogyakarta, Indonesia. Employing a qualitative literature review and thematic analysis, this paper synthesizes scholarly findings to develop a conceptual framework of nocturnal tourism grounded in cultural preservation, technological integration, and stakeholder engagement. The results reveal that nocturnal tourism in Asia has expanded through diverse cultural practices, nature-based attractions, and tech-enhanced experiences. Yogyakarta demonstrates high potential to adopt these trends by leveraging its rich cultural heritage, night-time traditions, and digitally literate youth. Key findings underscore the importance of community-led initiatives, adaptive spatial planning, and sustainable governance to ensure inclusive and resilient night tourism ecosystems. The study proposes a circular framework built on four pillars: cultural anchoring, tech-enabled sustainability, stakeholder inclusion, and regenerative impact metrics. This conceptual model not only highlights the cultural and socio-economic contributions of nocturnal tourism but also serves as a strategic tool for cultural cities navigating post-pandemic tourism recovery and sustainable urban development.
Co-Authors Adhy Sasongko, Rianto Afdhal Afdhal Agung, Rizqy Akbar, Mahesa Annisa Jusuf, Annisa Assaf, Rizka Aula Dimas, Agustinus Eko Poetro, Ridanto Hari Muhammad Jarwadi, Maulana Hayu Jery christianto Kariem, M. Agus Kusni, Muhammad Lavi Rizki Zuhal Muzakki, Sofyan Nhat Vu, Nguyen Van Novi Andria, Novi Palar, Pramudita Satria Perkasa, Rilis Eka Prasetyo, Febrian Angga Putra, Ichsan Setya Rachman Setiawan Santosa, Sigit P Santosa, Sigit Puji Santosa, Sigit Puji Sunarto, Setio Aji Suprijanto Suprijanto Tam, Le Hoai Tatacipta Dirgantara, Tatacipta Zuhal, Lavi R.