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All Journal Jurnal Simetris Rekayasa Mesin REKAYASA JOIV : International Journal on Informatics Visualization SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi INTEK: Jurnal Penelitian Jurnal Engine: Energi, Manufaktur, dan Material Journal of Vocational Education Studies (JOVES) Quantum Teknika Journal of Community Development Prosiding Seminar Nasional Program Pengabdian Masyarakat Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Jurnal Polimesin Majalah Teknik Mesin
Wisnujati, Andika
Universitas Muhammadiyah Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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2D Modelling of the Breakdown Voltage of Hybrid Dielectric (Gas and Solid) System Muzamil, Sanupal; Wisnujati, Andika
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 11 No 2 (2025): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol11.no2.a19380

Abstract

Sulfur hexafluoride (SF6) has been used over decades due to its excellent dielectric, arc quenching and heat transfer properties, but has tremendous global warming potential. It is therefore mandatory to find more environmentally friendly alternatives by designing of future eco-friendly hybrid insulation (solid and gas) system that require a thorough understanding of the evolution of electric field in such structure. A numerical model was developed using finite element method (FEM) of a commercial software Comsol® Multiphysics. Using electrostatic equations, the 2D model stability, 2D boundary model and  voltages are varied in order to identify their influence on the electric field distribution. Numerical simulations show that maximum electric fields will vary significantly according to distances of point-dielectric (gap). The maximum electric field increases if the gap (electrode tip-planar) size is shorter. Additionally, the electric field is not linearly spread in solid dielectric material and more concentrated around the edges of solid dielectric.
VEHICLE STEERING CONTROL DESIGN BASED ON AN INTEGRATED DYNAMIC MODEL WITH ANTI-LOCK BRAKING SYSTEM AND ADAPTIVE AUTOMATIC CONTROL Wisnujati, Andika; Muzamil, Sanupal
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.2157

Abstract

This research presents the design and development of a mathematical model for a vehicle steering system guided by the Antilock Braking System (ABS) with integrated automatic control. The purpose of this study is to enhance vehicle stability and steering performance, particularly under critical braking conditions where loss of traction and directional control commonly occur. The proposed model integrates ABS dynamics with an automatic steering control algorithm to simulate real-time responses of the vehicle under various road and driving scenarios. The mathematical formulation is based on vehicle kinematics and dynamics, incorporating nonlinear tire characteristics, braking force distribution, and steering angle adjustments. A control system utilizing PID (Proportional-Integral-Derivative) component is embedded into the model to optimize the coordination between braking and steering operations. Simulation results using MATLAB show that the integrated system significantly improves steering accuracy, reduces stopping distance, and maintains vehicle stability during sudden braking and turning maneuvers. The findings suggest that combining ABS with intelligent steering control contributes to safer driving, especially on slippery or uneven surfaces. This research serves as a foundational step toward the development of more advanced driver-assistance systems (ADAS) and contributes to the ongoing efforts in automotive safety engineering.
Analisis Sifat Fisik dan Mekanik Poros Berulir (Screw) Untuk Pengupas Kulit Ari Kedelai Berbahan Dasar Aluminium Bekas dan Piston Bekas Wisnujati, Andika; Hafiz, Lalu Alpan
INTEK: Jurnal Penelitian Vol 4 No 1 (2017): April 2017
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.177 KB) | DOI: 10.31963/intek.v4i1.99

Abstract

Aluminum alloys in this study using a mixture of aluminum profiles and former piston. Former piston is used to get the high enough of element Si. The addition of TiB element (Titanium-Boron) as much as 0.02% at the time of casting expected to improve the mechanical and physical character of aluminum, so that expected the aluminum alloy has a strength that is much better than without the addition of any element. Aluminum alloy to manufacture screw will be casted by using sand molds on three types of variations mold temperature 200oC, 300oC and 400oC. The Test were conducted to determine the mechanical properties of the aluminum alloy and physical that are : tensile test, hardness test, and metallographic with an optical microscope. The maximum test result occurred in Al-Si alloy material with TiB addition 0.02% and a heating temperature mold 400oC produces maximum tensile stress of 628.86 N / mm², while for Vickers Hardness Number (VHN) gives the figure of 114 kg / mm2; and for the results obtained from the data metallographic structure formed hypereutectic silicon which form the primary silicon phase. That phase provides high wear resistance. Finally, it is evident that the Al-Si alloys mentioned above can improve the properties of aluminum to manufacture a screw.
Analysis Of Mechanical Properties SMAW (Shielded Metal Arc Welding) Welding Joints Of Portable Electric Hydraulic Jack Frame Wisnujati, Andika; Andryansyah, Juni
INTEK: Jurnal Penelitian Vol 7 No 2 (2020): October 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v7i2.2134

Abstract

Welding is a very important part of the development and growth of the industry because it has a role in engineering, reparation, and construction. Shielded   Metal   Arc Welding (SMAW) or the conventional arc welding   process is particularly dominant in structural joints, pressure vessels and in maintenance and repair work. In welding, different metals are joined economically and at a much faster rate as compared with other fabrication processes like riveting and casting. The purpose of this research is to find out the cooling media cooler against SMAW smelter tensile strength by using the E6013 electrode. This study uses low carbon steel material that has levels Fe = 98,3%; C = 0,30%, Si = 0,23%. The material is given 75A welding current with cooling variation on the connection result using oil, water, and room temperature. The highest tensile stress value obtained in the oil cooling treatment was 844,76 N/mm2, the highest strain value was obtained on the raw materials of 16%, the highest elasticity value was obtained in the oil cooling treatment of 703.96 N/mm2. According to the research results can be concluded that the variations of cooling media greatly affect the strength of the welding connection.
Karakterisasi Pengecoran Paduan Al-Si-TiB dengan Variabel Suhu Die Casting Abdus Shomad, Muhammad; Wisnujati, Andika; Mudjijana, Mudjijana
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.15438

Abstract

This study describes the microstructure phase and the hardness value produced in metal casting with variations in metal mold temperature with the addition of Ti-B elements. gravity casting, a technique that relies solely on gravity, is used for casting metals. This objective of this study to determine the mechanical properties characterization of specimens using die casting molds by varying the mold temperature between 250°C, 350°C, 450°C and the addition of 0.05% Ti-B alloying elements. In addition, this research can determine the right temperature for metal casting by gravity casting method. The material used in this research is recycle piston Al-Si (series 4xxx). The results of hardness testing at a temperature of 250°C have produced 123.9 HVN. The microstructure of the Al-Si-TiB alloy material has dense grain boundaries. This is because the casting with the addition of the TiB element functions as a grain refiner and reduces porosity in the microstructure. So, the smaller the porosity, the stronger the hardness of the specimen or material. This is because at low mold temperatures, the metal casting process will freeze faster, resulting in higher hardness. In addition, the increasing temperature of the die casting mold has a tendency to change the eutectic structure of silicon to primary silicon.
KARAKTERISASI KEKERASAN DAN KEKUATAN TARIK BAJA TAHAN KARAT SS304 DENGAN VARIASI ELEKTRODA LAS BUSUR LISTRIK Wisnujati, Andika; Mudjijana, Mudjijana; Sutoyo, Sutoyo
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.2029

Abstract

This study examines the hardness and tensile strength characterization of SS304 stainless steel welded using different electrode variations in the Shielded Metal Arc Welding (SMAW) process. The research focuses on three types of electrodes: NSN 308, NSN 309L, and NSN 312, to evaluate their influence on the mechanical properties of the weld metal. Hardness testing was conducted using the Vickers method with a 200-gf load, while tensile strength testing was performed to assess ultimate tensile strength (σu), yield strength (σy), and elongation (ε). The results indicate that the selection of electrodes significantly affects the hardness and tensile properties of the welded joints. NSN 312 exhibited the highest hardness values, particularly in the weld metal and filler areas, suggesting the formation of hard phases such as martensite or chromium-rich ferrite, making it suitable for wear-resistant applications. NSN 309L demonstrated moderate hardness, indicating a more balanced microstructure that provides good toughness and ductility. NSN 308 showed the lowest hardness values, which can be beneficial for applications requiring greater deformability. In the tensile test, NSN 309L achieved the highest ultimate tensile strength 47.77 Kg/mm² and elongation 45%, suggesting an optimal balance of strength and ductility. NSN 312 exhibited the highest yield strength 46 Kg/mm², indicating better resistance to plastic deformation. Meanwhile, NSN 308 had lower tensile properties compared to the other electrodes.  Overall, electrode selection should align with specific application requirements. NSN 312 is recommended for wear-resistant applications, NSN 309L for structures requiring both strength and ductility, and NSN 308 for applications with lower mechanical stress.
Balancing Consumer Protection and Industrial Growth: The Policy Dilemma of TVET Factory Product in Indonesia Sari, Norma; Muchlas, Muchlas; Wisnujati, Andika
Journal of Vocational Education Studies Vol. 8 No. 2 (2025): Vol 8 No 2
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/joves.v8i2.14128

Abstract

The Teaching Factory (TeFa), as an integral component of the Technical and Vocational Education and Training (TVET) framework in Indonesian Vocational High Schools (SMK), has emerged as a crucial technique to align educational outcomes with industrial requirements.  Students receive training in technical skills as well as entrepreneurial and manufacturing processes through practical production activities.  This integration presents a policy issue when TeFa goods enter the market and confront industry standards and consumer protection legislation.  This study investigates three primary inquiries: (1) to what degree do TVET Factory products manufactured by SMKs in Indonesia adhere to relevant industry standards; (2) is the existing legal framework sufficient to ensure consumer protection concerning TeFa products; and (3) how should forthcoming policies and regulations be formulated to harmonize consumer protection with industry development goals in the execution of the TVET Factory program.  The research used a qualitative methodology, incorporating case studies from five vocational schools across diverse domains of expertise, augmented by interviews with stakeholders including educators, industry partners, and regulatory bodies.  The findings indicate that the compliance of TeFa products with industry standards remains inconsistent, and current rules do not specifically address items based on vocational education.  This generates legal uncertainty and impediments in product down streaming.  Consequently, a novel, adaptable policy framework is required to safeguard consumers while promoting industry expansion through the synergy of TVET and market laws.
Analyzing Coverage Probability of Reconfigurable Intelligence Surface-aided NOMA Widodo, Agung Mulyo; Wijayanto, Heri; Wijaya, I Gede Pasek Suta; Wisnujati, Andika; Musnansyah, Ahmad
JOIV : International Journal on Informatics Visualization Vol 7, No 3 (2023)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/joiv.7.3.2054

Abstract

Along with the explosive growth of wireless communication network users who require large frequency bands and low latency, it is a challenge to create a new wireless communication network beyond 5G. This is because installing a massive 5G network requires a large investment by network providers. For this reason, the authors propose an alternative beyond 5G that has better quality than 5G and a relatively lower investment value than 5G networks. This study aims to analyze the downlink of the cooperative non-orthogonal multiple access (NOMA) network, which is usually used in 5G, combined with the use of a reconfigurable intelligence surface (RIS) antenna with decode and forward relay mechanisms. RIS is processed with a limited number of objects utilizing Rayleigh fading channels. The scenario is created by a user who relays without a direct link for users near the base station and with a direct link for users far from the base station. Under the Nakagami-m fading channel, the authors carefully evaluated the probability of loss for various users as a function of perfect channel statistical information (p-CSI) utilizing simply a single input-output (SISO) system with a finite number of RIS elements. As a key success metric, the efficiency of the proposed RIS-assisted NOMA transmission mechanism is evaluated through numerical data on the outage probability for each user. The modeling outcomes demonstrate that the RIS-aided NOMA network outperforms the traditional NOMA network
Co-Authors Abdus Shomad, Muhammad Acyutarayi, Rakashafi Noorsy Adhitya, Fajar Ahmad Musnansyah Andryansyah, Juni Anggara, Fajar Anugrah, Rinasa Agistya Dini, Putri Indra Fauzi, M. As’ad Ferriawan Yudhanto Ferriawan Yudhanto Ferriawan Yudhanto, Ferriawan Ghani, Farid Abdul Hafiz, Lalu Alpan Hanani, Hayyu Amalina Heri Wijayanto I Gede Pasek Suta Wijaya Indah, Diyaah Putri khusnul khotimah Kusmo no Lukman Nulhakim Marjani, Zaidan Isham Muchlas Muchlas Mudjijana, Mudjijana Muzamil, Sanupal Norma Sari Nuki, Fauzan Rizky Nurmayanti, Septia Prambandono, Bayu Putra, Zebadia Akbar Putri, Kika Fidiyah Putri, Saskia Maharani Shomad, Muhammad Abdus Sutoyo Sutoyo Syamsul Ma’arif Tsany, Dylan Ataa Wardana, Linda Kusumastuti Wibawa, Unggul Adi Widhaningrum, Tivani Nuri Widodo, Agung Mulyo Yusuf, Mirza Zahira, Zalfa Shafa’ Zalzabilla, Alifvia Kityn Zen, Andril Muhammad