Articles
<![CDATA[Comprehensive Hydrodynamic Analysis of Oscillating Flapping Mechanism for Enhanced Wave Energy Converter Technology ]]>
<![CDATA[Aldi Anggara, Rizki]]>;
<![CDATA[Julian, James]]>;
<![CDATA[Wahyuni, Fitri]]>;
<![CDATA[Purba, Riki Hendra]]>
<![CDATA[ TURBO [Tulisan Riset Berbasis Online] Vol 14, No 1 (2025): TURBO : Jurnal Program Studi Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Muhammadiyah Metro ]]>
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DOI: 10.24127/trb.v14i1.3786
<![CDATA[The comprehensive utilization of renewable energy stands as a national priority within Indonesia's strategic framework aimed at achieving the net zero emissions target by 2060. Indonesia, a nation in which nearly 70% of its territory is comprised of oceans, possesses significant potential in wave energy as a renewable energy source. This sector presents promising opportunities for development and investment. This study focuses on the three-dimensional hydrodynamic study of Wave Energy Converter (WEC) technology based on oscillating flapping through a numerical approach. The findings of the characteristic test demonstrate that the oscillating flapping device exhibits a response characterized by a deviation in the oscillating tilt angle. The direct impact of ocean waves causes the flap to shift from its equilibrium position and continuously move back and forth with a particular frequency. The dynamics working on this device show a correlation between wave input and the response that occurs. The response parameters, including maximum angular deviation, average speed, and torque, have a similar trend to changes in wave period. The influence of ocean wave activity is observed to increase within the low wave period zone up to a designated period threshold. Overall, the oscillating flapping device demonstrates enhanced performance in low wave conditions. The average maximum output power is capable of reaching 1.5 Watts on A1, 3.5 Watts on A2, and 4.5 Watts on A3.]]>
<![CDATA[SOSIALISASI RISIKO LIMBAH MINYAK JELANTAH DAN SOLUSINYA ]]>
<![CDATA[Wahyuni, Fitri]]>;
<![CDATA[Nisa, Rasya Aulia Nathania]]>;
<![CDATA[Julian, James]]>;
<![CDATA[Lumbantoruan, Regina Natalindah]]>;
<![CDATA[Mahdhudhu, Fathin Muhammad]]>;
<![CDATA[Purba, Riki Hendra]]>;
<![CDATA[Armadani, Elvi]]>
<![CDATA[ Jurnal Bakti Masyarakat Indonesia Vol. 8 No. 1 (2025): Jurnal Bakti Masyarakat Indonesia ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Tarumanagara ]]>
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DOI: 10.24912/jbmi.v8i1.34381
<![CDATA[Used cooking oil is cooking oil that is no longer suitable for use because it has undergone changes in physical and chemical properties during the frying process. Used cooking oil is a hazardous and toxic waste; consuming it can cause negative impacts on health and disposing of it carelessly can cause environmental pollution. However, public knowledge about the dangers and impacts of used cooking oil is still minimal. A study showed that there are still many people who dispose of used cooking oil on the ground and waterways. Therefore, the activity designed by the PKM team of Universitas Pembangunan Nasional Veteran Jakarta aims to increase public knowledge about the dangers and impacts of used cooking oil and provide solutions to reduce the pollution of used cooking oil waste. This activity was carried out in the Grand Pakis Residence housing complex using socialization and training methods. In this activity, the PKM team invited representatives from the Jalantara foundation as speakers to explain the impact of used cooking oil on the environment and health to the community. Not only that, the community was also given a training on processing used cooking oil into other products as a solution to reduce used cooking oil waste. The result of this activity is that the knowledge of residents about the dangers of used cooking oil for the environment and health has increased by 80.95%. In addition, the residents also know how to reduce used cooking oil by turning it into useful products such as soap.]]>
<![CDATA[UNCERTAINTY ANALYSIS OF VOLTAGE MEASUREMENT USING ATMEGA328P MICROCONTROLLER: AN ANOVA TEST APPROACH ]]>
<![CDATA[Julian, James]]>;
<![CDATA[Fauzi, Ade Fikri]]>;
<![CDATA[Dewantara, Annastya Bagas]]>;
<![CDATA[Ulhaq, Faiz Daffa]]>;
<![CDATA[Wahyuni, Fitri]]>
<![CDATA[ MEDIA STATISTIKA Vol 17, No 2 (2024): Media Statistika ]]>
Publisher : <![CDATA[Department of Statistics, Faculty of Science and Mathematics, Universitas Diponegoro ]]>
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DOI: 10.14710/medstat.17.2.173-184
<![CDATA[The voltage sensors are widely used in various applications. In certain applications, such as medical devices, autonomous vehicles, or the military, the sensor's accuracy and level of precision play an important role, making it necessary to evaluate the sensor's performance. In this research, testing of direct current (DC) voltage sensors was carried out using analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) to test sensor performance in various voltage ranges. This research used an experimental-based quantitative approach, using the ATmega328P. Data collection begins by calibrating the analog-to-digital converter (ADC) readings against voltage values with linear regression, the Chauvenet criterion to eliminate outlier data caused by noise from the environment, One-way ANOVA is used to determine differences in variations between voltage distances, and a Q-Q plot is used to determine the normality of the sensor error distribution. This research obtained from Tukey-HSD that 9 comparisons accepting the null hypothesis (H0). And 27 pairs accepting the alternate hypothesis (H1). The data was found to be normally distributed through the calculation of residual ANOVA, and visualization of data with the Q-Q plot, and the use of the sensor was effective in the range of 3V to 24.5V.]]>
<![CDATA[The Influence of Fillet Step on Backward-Facing Step Flow Characteristics ]]>
<![CDATA[Julian, James]]>;
<![CDATA[Anggara, Rizki Aldi]]>;
<![CDATA[Wahyuni, Fitri]]>
<![CDATA[ Infotekmesin Vol 14 No 2 (2023): Infotekmesin: Juli, 2023 ]]>
Publisher : <![CDATA[P3M Politeknik Negeri Cilacap ]]>
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DOI: 10.35970/infotekmesin.v14i2.1919
<![CDATA[Backward-facing step (BFS) is a model that provides several applicative features in engineering. The complex phenomena of BFS flow have a crucial impact on any application. Therefore, this study comprehensively investigates the flow characteristics of BFS with various step shapes. The backward-facing step (F-BFS) fillets were tested at intervals of Reynolds number 50 smaller than Re smaller than 400 using the CFD approach. Based on the computational results, it was found that flow separation is a fundamental phenomenon in BFS flow. Due to sudden expansion, Flow separation forms a recirculation area which continues to increase almost linearly with an increase in the Reynolds number. The recirculation area contains unstable rotating vortexes, which can impact the flow efficiency of BFS. Using a different step shape proves that F-BFS can minimize the recirculation area to increase the efficiency of the BFS flow.]]>
<![CDATA[Utilization of AIS Satellite Data as Behavior Information Towards Interruption Violations in the Makassar Strait ]]>
<![CDATA[Hadinata, Tri]]>;
<![CDATA[Sutanto, Rudy]]>;
<![CDATA[Julian, James]]>;
<![CDATA[Yudho Prakoso, Lukman]]>;
<![CDATA[Putra, Demo]]>
<![CDATA[ Jurnal Keamanan Nasional Vol. 9 No. 1 (2023): JURNAL KEAMANAN NASIONAL VOL 9 NO 1 TAHUN 2023 ]]>
Publisher : <![CDATA[Pusat Kajian Keamanan Nasional (Puskamnas) Universitas Bhayangkara Jakarta Raya ]]>
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<![CDATA[ Indonesia is the world’s largest archipelagic country, with a coastline of 81,000 km. Indonesia’s beaches and seas are rich in natural resources, especially marine commodities like fish. The abundance of fish in the Indonesian seas has led to crimes committed by domestic ships not equipped with documents and foreign vessels. This study aims to analyze the causes of crime in the Makassar Strait with a crime orientation in the middle of the sea. In particular, this study also examines the security monitoring process using AIS Satellite. So that in the future, the enforcement carried out by stakeholders related to sea and maritime security will become more conducive and transparent. This research method uses a qualitative descriptive approach to describe data from AIS satellites in the Makassar Strait. The data collection process is carried out by taking satellite data directly and processing it so that some information about ship types and loading and unloading activities can be known comprehensively. Then it is used to determine which ships are initially identified as committing a violation. This information is used to act effectively, efficiently, and appropriately on sea breaches. This method is expected realization that institutions and stakeholders can work together to patrol at sea and promptly act against violations at sea. The discussion location is in the Makassar Strait because the area borders other countries and is one of the locations for abundant fish resources and international shipping lanes. The data for identifying ships suspected of committing crimes in the Makassar Strait was processed from 2019 to 2022. The violations include 22 smuggling ships, 13 drug smuggling ships, and 12 offending crime ships. The data revealed significant violations. Thus, from the analysis results, it is better to need the right timing in implementing patrols and the appropriate momentum for enforcement. Therefore, AIS Satellite is expected to help and improve law enforcement in that location.]]>
<![CDATA[ANALYSIS OF COGGING TORQUE REDUCTION FROM DESIGN COMPUTATIONAL PERMANENT MAGNET SYNCHRONOUS MOTOR WITH TAGUCHI METHOD ]]>
<![CDATA[Wahyuni, Fitri]]>;
<![CDATA[Julian, James]]>;
<![CDATA[Ferdyanto, Ferdyanto]]>;
<![CDATA[Fauzi, Ade Fikri]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v15i1.1492
<![CDATA[Permanent Magnet Synchronous Motor (PMSM) applications include electric vehicles, industrial pumps, wind turbines, aerospace technology, and many others. In this study, cogging torque is the central aspect of the discussion, which is the motor model, the thickness of the permanent magnet rotor, and the air gap in the electric motor influence. The Taguchi method uses parameter levels on the motor, which are divided into 16 types of orthogonal arrays, where the process is carried out twice in iterations. The first stage of simulation testing was to produce the primary model where number 4 (A1B4 series) was obtained as the most optimal motor model with a cogging torque of 1.56 Nm and an air gap flux density of 768 mTesla (mili tesla). Then the second test was to modify several parts of the motor with the following 16 orthogonal array types, which produced number 8 (A2B4 series) with a cogging torque of 1.08 Nm and an air gap flux density of 733 mTesla. One of the parameters apart from the cogging torque must be maintained is the air gap flux density. This variable affects the permeability of the motor so that later it will affect the amount of material used and the production costs of electric motors. The final result is a model that produces the lowest cogging torque while maintaining other parameters on the motor.]]>
<![CDATA[Study of hydrodynamic characteristics in oscillating wave surge converter ]]>
<![CDATA[julian, james]]>;
<![CDATA[Anggara, Rizki Aldi]]>;
<![CDATA[Naufal, Ridwan Daris]]>;
<![CDATA[Ramadhani, Rifqi]]>;
<![CDATA[Prasetyo, Eko Andi]]>;
<![CDATA[Wahyuni, Fitri]]>;
<![CDATA[Gunasti, Nabilah Dwi]]>
<![CDATA[ Jurnal Polimesin Vol 22, No 2 (2024): April ]]>
Publisher : <![CDATA[Politeknik Negeri Lhokseumawe ]]>
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DOI: 10.30811/jpl.v22i2.4715
<![CDATA[In the realm of renewable energy, researchers worldwide have been paying close attention to developing the Oscillating Wave Surge Converter (OWSC) device. This device has the potential to harness the power of ocean waves and convert it into a reliable source of clean energy. Hydrodynamic characteristics are essential parameters in developing OWSC devices. Therefore, this research conducted a hydrodynamic study on the OWSC device with variations in ocean wave periods, including T= 1.5, 1.7, 1.9, 2.1, and 2.3. The Boundary Element Method (BEM) describes the interaction between sea waves and floating body structures. This method assumes incompressible, inviscid, and irrotational flow. A numerical approach is used as a calculation method followed by verification and validation to support the level of actualization. The research results showed that the incident wave caused the OWSC device to experience a deviation from its equilibrium position in the form of an oscillating flap inclination angle as a form of hydrodynamic characteristics. The sea wave period correlatedwith the rate of change in flap position over time, including the maximum deviation in the flap angle. As a power plant, the performance of the OWSC device can work at reasonably short-wave period intervals based on the device's ability to produce mechanical power. The highest average mechanical power was achieved in the T= 1.5 period of 34.49 Watts with an efficiency of up to 52.43%. The OWSC device requires a high intensity of wave energy in a short duration to generate optimal mechanical power. It is important to note that optimal mechanical power generation is crucial for the OWSC device to function effectively. Therefore, the device should be placed in a location where the wave energy intensity is consistently high.]]>
<![CDATA[Numerical Study On Characteristics Of The Backward-Facing Step Flow With Variations Of The Slope Angle Of The Step ]]>
<![CDATA[julian, james]]>;
<![CDATA[Anggara, Rizki Aldi]]>;
<![CDATA[Wahyuni, Fitri]]>
<![CDATA[ Jurnal Polimesin Vol 22, No 1 (2024): February ]]>
Publisher : <![CDATA[Politeknik Negeri Lhokseumawe ]]>
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DOI: 10.30811/jpl.v22i1.4052
<![CDATA[The phenomenon of flow separation plays a vital role in the industrial world. The backward-facing step (BFS) is a general form representing flow separation. This study investigates the influence of the slope angle of the step on BFS flow characteristics at various low Reynolds numbers. According to the CFD results, the flow separation phenomenon forms a circulation zone for each increase in Reynolds numbers. This phenomenon is a result of the sudden expansion of the channel geometry. The BFS with the slope angle of the step demonstrates that the increase in the recirculation zone can be minimized, thus appropriately delaying flow separation. The recirculation zone causes fluid flow to reverse direction, affecting fluid flow efficiency due to resulting pressure differences. Therefore, a BFS with the slope angle of the step exhibits a more efficient flow phenomenon by minimizing the recirculation zone.]]>
<![CDATA[Analisis Daya Keluaran pada Kinerja Motor Listrik Tipe Synchronous Berbasis Komputasional ]]>
<![CDATA[Ferdyanto, Ferdyanto]]>;
<![CDATA[Farha, Auditya]]>;
<![CDATA[Julian, James]]>;
<![CDATA[Wahyuni, Fitri]]>;
<![CDATA[Rizal, Reda]]>
<![CDATA[ TELKA - Telekomunikasi Elektronika Komputasi dan Kontrol Vol 9, No 2 (2023): TELKA ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro UIN Sunan Gunung Djati Bandung ]]>
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DOI: 10.15575/telka.v9n2.107-116
<![CDATA[Masalah yang menjadi pertimbangan dalam penggunaan motor listrik adalah daya keluaran yang dihasilkan pada saat motor bekerja. Penelitian ini berfokus pada analisis daya keluaran Permanent Magnet Synchronous Motor (PMSM) yang akan diuji pada kecepatan tertentu serta ditinjau terhadap perubahan sudut torsi tiap putaran. Tujuan penelitian ini adalah mendapatkan analisis daya keluaran dengan karakteristik yang stabil serta kinerja PMSM yang menghasilkan efisiensi sesuai standar. Penelitian menggunakan metode komputasi dengan model finite element analysis (FEA) yang dilakukan dengan menggunakan software. Hasil dari penelitian ini diperoleh performa PMSM dengan arus input sebesar 1.5 kA pada setiap fasa sehingga motor dapat beroperasi dengan kecepatan 13300 rpm serta menghasilkan torsi sebesar 164 Nm. Fluks magnet yang terbentuk berada dalam kondisi stabil dengan nilai 0.02 Wb dan membentuk distribusi medan magnet yang merata pada setiap kumparan stator. Rata-rata daya keluaran maksimum yang dihasilkan jangkar rotor adalah 107.6 kW pada sudut torsi 114°. Penelitian telah berhasil memperoleh analisis daya keluaran pada PMSM melalui metode komputasi. Hasil analisis tersebut dapat menjadi acuan dalam proses manufaktur PMSM. The problem that is considered in the use of electric motors is the output power generated when the motor is working. This research focuses on analyzing the output power of a Permanent Magnet Synchronous Motor (PMSM) which will be tested at a certain speed and looking at changes in torque angle for each rotation. The aim of this research is to obtain an output power analysis with stable characteristics and PMSM performance that produces efficiency according to standards. The research uses computational methods with finite element analysis (FEA) models which are carried out using software. The results of this research obtained PMSM performance with an input current of 1.5 kA in each phase so that the motor can operate at a speed of 13300 rpm and produce a torque of 164 Nm. The magnetic flux formed is in a stable condition with a value of 0.02 Wb and forms an even magnetic field distribution in each stator coil. The average maximum output power produced by the rotor armature is 107.6 kW at a torque angle of 114°. Research has succeeded in obtaining output power analysis on PMSM through computational methods. The results of this analysis can be used as a reference in the PMSM manufacturing process.]]>
