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All Journal Jurnal Teknik ITS IPTEK Journal of Proceedings Series Rekayasa Mesin Jurnal Edukasi dan Penelitian Informatika (JEPIN) Seminar Nasional Informatika (SEMNASIF) Syntax Literate: Jurnal Ilmiah Indonesia CARADDE: Jurnal Pengabdian Kepada Masyarakat Teknomekanik JMES: The International Journal of Mechanical Engineering and Sciences
Alief Wikarta
Departemen Teknik Mesin Institut Teknologi Sepuluh Nopember
Humanities Computer Science & IT Education Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Penerapan Produk Teknologi Traktor Tangan Bertenaga Listrik Untuk Petani Alief Wikarta; Is Bunyamin Suryo; M Khoirul Effendi
CARADDE: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 3 (2023): April
Publisher : Ilin Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31960/caradde.v5i3.1829

Abstract

Tujuan dari artikel ini adalah untuk menerapkan teknologi traktor tangan bertenaga listrik yang dapat membantu meningkatkan efisiensi dan produktivitas pada pengelolaan lahan pertanian. Metode yang digunakan adalah dengan melakukan fabrikasi komponen mekanik dan elektrik dari traktor tangan bertenaga listrik. Fabrikasi tersebut meliputi pembuatan komponen mekanis seperti frame, cage wheel, under cover, battery and controller cover, motor mount, dan leveler, serta pembuatan komponen electric power train seperti electric motor, controller, battery pack, dan sprocket serta chain. Pembuatan traktor tangan bertenaga listrik dilakukan di workshop mobil listrik Institut Teknologi Sepuluh Nopember (ITS), kemudian produk diuji coba di lahan pertanian yang ada di desa Wanar, Lamongan. Hasil pengujian menunjukkan bahwa traktor tangan bertenaga listrik ini memiliki performa yang baik dan mampu menghemat biaya pengelolaan lahan pertanian dengan signifikan. Dengan menggunakan teknologi ini, petani dapat mengurangi biaya operasional seperti penggunaan bahan bakar, perawatan mesin, dan penggantian suku cadang. Oleh karena itu, disarankan untuk terus melakukan pengembangan dan penelitian lebih lanjut dalam penggunaan traktor tangan bertenaga listrik sebagai alternatif pengelolaan lahan pertanian yang efisien dan ramah lingkungan.
Natural fiber substitution in glass fiber-reinforced plastics: A Tensile properties simulation Wikarta, Alief; Andikusuma, Chandya; Ariatedja, Julendra; Batan, I Made Londen; Gapsari, Femiana; Khoo, Sze Wei
Teknomekanik Vol. 8 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i1.33472

Abstract

Glass fiber-reinforced polymer composite materials, commonly used for industrial axial flow fan blades due to their high strength-to-weight ratio, are environmentally criticized for their non-biodegradability. This concern has prompted the investigation of eco-friendly alternatives, such as sisal and kenaf as natural fibers. Although they generally have lower mechanical properties than synthetic fibers, they offer advantages in terms of biodegradability, cost, and density. This study aims to evaluate the feasibility of partially substituting glass fiber with unidirectional natural fibers kenaf and sisal in a 14-layer GFRP axial fan blade through numerical simulation. The research employed a finite element method (FEM) to simulate tensile testing in accordance with ASTM D-638 standards. Several hybrid layer configurations were analyzed, focusing on the number and position of natural fiber layers replacing glass fiber, particularly the glass roving (GR) layers. The simulation investigated how these substitutions influence the overall tensile stress and elastic modulus of the composite blade structure. The findings suggest that this substitution does not significantly affect tensile characteristics but substantially improves the biodegradability of the composite, resulting in a more environmentally friendly material without compromising mechanical performance.
A Participatory Risk-Matrix Framework for User-Centered Validation of a Manual Standing Wheelchair Wikarta, Alief; Nurirawan, Rizkhi
JMES The International Journal of Mechanical Engineering and Sciences Vol 9, No 2 (2025)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v9i2.23228

Abstract

This study presents a participatory, risk-based validation framework for a manually actuated standing wheelchair. The standing function offers both physical and psychosocial benefits, including greater independence, improved social interaction, and better access to vertical space. However, adoption of such devices remains limited, especially in low-resource settings, due to concerns about usability, comfort, and safety. Rather than emphasizing technical novelty, the contribution of this study lies in applying a user-centered risk-matrix approach to systematically translate stakeholder concerns into design priorities. Through engagement with eight stakeholders, including direct users and institutional representatives, the study collected qualitative feedback on user experience. This feedback was organized into eight thematic risk categories. Among them, stability during transitions and the level of physical effort required were identified as the most pressing concerns. Each risk type was then evaluated using a qualitative 5×5 matrix to assess its likelihood and potential impact. This structured process enabled the design team to prioritize and implement targeted improvements, effectively reducing the likelihood of tipping-related risks. However, physical accessibility, particularly for users with limited upper-body strength, remained a high, unmitigated risk due to inherent limitations of manual operation. The study highlights the importance of integrating structured risk analysis with real user input to inform assistive technology development that is not only functional, but also contextually responsive.
Redesign of Rupture Disc Cross-Cut Type on the Condenser Steam Turbine Using Aluminium Alloy 1100 Materials Marwan; Alief Wikarta
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v11i5.64355

Abstract

In 2018, the electrical power system in South Sumatra experienced a major disturbance that caused a widespread blackout affecting all power plants, including the Indralaya Combined Cycle Power Plant (CCPP). To protect condenser system equipment from overpressure conditions, a rupture disc is installed as a safety device. The rupture disc must withstand the condenser operating vacuum pressure while rupturing in a controlled manner under excessive pressure conditions. This study aims to redesign and evaluate a safe and effective rupture disc using numerical simulation, analytical calculation, and experimental testing. Numerical analysis was conducted using the Finite Element Method (FEM) in ANSYS with a static structural approach. Analytical burst pressure prediction was performed using the Salarvand equation. Experimental validation was carried out through vacuum pressure testing on the actual rupture disc and overpressure testing on a 1:10 scale prototype. The results indicate that groove depth and scoring pattern significantly influence the burst pressure of the rupture disc. Increasing groove depth decreases burst pressure due to higher stress concentration in the grooved region. Experimental testing showed that the rupture disc with a groove depth of 1.5 mm failed before reaching the operating vacuum pressure of −0.086 bar, whereas the 0.5 mm groove depth maintained structural integrity under the same condition. Validated numerical simulation results demonstrated that rupture discs with groove depths of 0.5 mm and 1.0 mm produced burst pressures ranging from 0.10 to 0.12 MPa under overpressure conditions. The redesigned rupture disc therefore meets condenser safety requirements and has potential as a lower-cost alternative to OEM components using locally available materials.
Static Load Analysis of Various Wing Spar Profiles: A Comparative Study between Mathematical and Finite Element Methods Widyawasta Widyawasta; Alief Wikarta
JMES: The International Journal of Mechanical Engineering and Sciences Vol 8 No 1 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i1.20060

Abstract

Unmanned aerial vehicles (UAVs) have become increasingly essential in both civilian and military contexts, serving various roles such as surveillance, mapping, cargo transport, and specialized tasks. The demand for long-endurance surveillance UAVs is critical for covering vast areas continuously, prompting the development of Medium Altitude Long Endurance (MALE UAV). This paper explores the structural strength analysis of various wing spar profiles of MALE UAV using mathematical analysis and Finite Element Method (FEM) under static loads. The wings, pivotal for generating lift, are subjected to rigorous operational loads, necessitating robust structural reliability. While mathematical analysis provides fundamental insights, FEM allows for detailed simulations under various conditions. Comparative studies between mathematical analysis and FEM are conducted to validate the structural strength of MALE UAV wings, with a focus on different spar profiles. Aluminum Al7075-T6 is used as the material, with convergence tests ensuring FEM accuracy. The comparative analysis highlights significant variations in normal and shear stress among different spar profiles, with the widest disparities observed at the wing root, 6.40 and 1 MPa resp., and the least, 1.51 and 0.63 MPa, close to the wing tip position at 6.75 m. These insights underscore the critical role of structural integrity in optimizing UAV performance and reliability.
Design and Fabrication of Composite Monocoque Chassis for Formula Student Racing Car Alief Wikarta; Ismail Maydiyanto
JMES: The International Journal of Mechanical Engineering and Sciences Vol 7 No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.13357

Abstract

This study uses a combination of analytical, simulation, and experimental methods in the design process of a sandwich-structured composite monocoque chassis. The analytical method, which determines the stiffness value of the composite, depends on the number of layers and the orientation of the fiber angle. The simulation method, which is based on the finite-element method, is used to validate the stiffness value. The experimental method involves a 3-point bending test used to verify the effectiveness of the design produced by analytical and simulation methods. After all model designs were validated through simulation and experimental methods, the next stage is fabrication. The stiffness and strength are achieved with variations, which have combined layup orientation angles of 0° and 45°. This can be applied to all panels, regardless of the number of layers. Based on the design results, the processes involved in fabricating the monocoque chassis begin with the manufacture of molds and the lay-up of carbon fiber. The process is continued by inserting the prototype into the oven, after which the final product then undergoes finishing to prepare it for use. The fabricated monocoque chassis has been used in 2 events in Japan’s annual Formula SAE student racing car competition.
Stress Analysis of Solar Electric Bus Chassis Using Finite Element Method Alief Wikarta; Yolas Aditya Yudha
JMES: The International Journal of Mechanical Engineering and Sciences Vol 4 No 1 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i1.9361

Abstract

All of the electrical and mechanical components in the solar-electric bus certainly require a chassis. A chassis frame construction must be strong and light enough to bend when it receives loads. This article focuses on stress analysis using finite element method related to the solar-electric bus chassis, including the vertical load, longitudinal (acceleration and braking), and turning load. It began with a literature review and collecting the data of chassis dimensions and materials. It was then ended by getting the data simulation and evaluation of comparison results. From the simulation results for the chassis initial design, the highest Von-Misses stress happened for turning load, 182.45 MPa, and a safety factor of 1.4. While from simulation of the redesigned chassis, the Von-Mises stress reduced to 169.87 MPa with a safety factor of 1.5. Furthermore, the vertical load conditions resulted in the lowest Von-Mises stress, which was 87.89 MPa with a safety factor of 2.84.
Complex Potential Methods for a Crack and Three-phase Circular Composite in Anti-plane Elasticity Alief Wikarta; Unggul Wasiwitono; Indra Sidharta
JMES: The International Journal of Mechanical Engineering and Sciences Vol 1 No 1 (2017)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i1.2212

Abstract

An interaction between an anti-plane crack with a three-phase circular composite by using complex potential methods is considered in this paper. The solution procedures for solving this problem consist of two parts. In the first part, based on complex potential methods in conjunction with analytical continuation theorem and alternating technique, the complex potential functions of a screw dislocation interacting with three-phase circular composites are obtained. The second part consists of the derivation of logarithmic singular integral equations by introducing the complex potential functions of screw dislocation along the crack border together with superposition technique. The logarithmic singular integral equations are then solved numerically by modeling a crack in place of several segments. Linear interpolation formulae with undetermined coefficients are applied to approximate the dislocation distribution along the elements, except at vicinity of the crack tip where the dislocation distribution preserves a square-root singularity. The mode-III stress intensity factors are then obtained numerically in terms of the values of the dislocation density functions of the logarithmic singular integral equations.
Co-Authors Aang Ferianto Agus Sigit Pramono Agus Sigit Pramono Alfian Aziz Sahadewa Andikusuma, Chandya Ariatedja, Julendra Effendi, M Khoirul Femiana Gapsari MF I Made Londen Batan I Nyoman Sutantra Indra Sidarta Indra Sidharta Is Bunyamin Suryo Ismail Maydiyanto Ismail Maydiyanto Khoo, Sze Wei M Khoirul Effendi Marwan Nurirawan, Rizkhi Radian Fauzia Rahman Sutikno Sutikno Unggul Wasiwitono Widyawasta Widyawasta Yolas Aditya Yudha Yolas Aditya Yudha Yuniarto, M. Nur