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All Journal Rotasi Jurnal Kreativitas PKM PEDULI: Jurnal Imiah Pengabdian Pada Masyarakat Indonesian Journal of Community Dedication Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Journal of Applied Science, Engineering, Technology, and Education Jurnal Bakti Masyarakat Indonesia Academia Open Journal La Multiapp Indonesian Journal of Innovation Studies Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Eduvest - Journal of Universal Studies Madani : Jurnal Pengabdian Kepada Masyarakat Nemui Nyimah
Damora Rhakasywi
UNIVERSITAS PEMBANGUNAN NASIONAL VETERAN JAKARTA
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Other

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Pelatihan e-Learning bagi Para Guru SMAIT Al-Ukhuwah Pagaden Subang Jawa Barat Berbasis Edmodo Nur Cholis; Damora Rhakasywi
Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Vol 5, No 1 (2020): March 2020
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/abdimas.v5i1.3641

Abstract

One of the learning management system learning is Edmodo. Edmodo was developed based on the principles of group-based classroom management and social media. E-learning is expected to be able to reduce obstacles in the implementation of teaching and learning activities that are no longer limited by distance and time. Teachers and students no longer need to come face to face and interact through the e-learning application. Edmodo learning media is used by students, teachers and parents to monitor their children's learning development. Students who use Edmodo can discuss with each other whenever and wherever subjects with other students related, increase the interaction of lecturers with students, they can be more independent in learning, and material that has been uploaded by lecturers can be downloaded by students and used as a learning reference source. In addition, assignments are given through the assignment and quiz features that have a time limit so that they can train discipline in doing the task. The service team empowered the teachers and students in the teaching and learning process using the e-learning system in the form of Edmodo training at Al-Ukhuwah Subang High School. How to cite:Cholis, N., Rhakasywi, D. (2020). Pelatihan e-Learning bagi Para Guru SMAIT Al-Ukhuwah Pagaden Subang Jawa Barat Berbasis Edmodo. Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang,5(1), 79-84.DOI: https://doi.org/10.26905/abdimas.v5i1.3641 
USE OF SOLAR ENERGY TO SAVE FISHING BOAT OPERATIONS FOR FISHERMAN IN PULO AMPEL VILLAGE, SERANG DISTRICT Damora Rhakasywi; Bambang Sudjasta; Amir Marasabessy
MADANI: Jurnal Pengabdian Kepada Masyarakat Vol 9 No 1 (2023): Madani : Jurnal Pengabdian Kepada Masyarakat
Publisher : LPPM UPN Veteran Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53834/mdn.v9i1.5242

Abstract

In an effort to help improve the welfare of fishing communities, universities implement community service programs, this is an alternative in empowering the economy of fishing communities. There is a fishing village in Pulo Ampel Village, Serang Regency, Banten Province. Fishing activities by fishermen around the offshore Pangkalan Ikan in the village. Puloampel has a population of 11,758 people, namely 5,943 men and 5,815 women. Most of the people in Puloampel are fishermen, trading businesses, and farmers. The size of the existing fishing boats are generally relatively small, between 3 GT and 5 GT. The number of fishermen is 126 people, and there are 38 operating fishing boats. The fishermen use fishing boats generally leaving at night until the morning ± 8 hours. Currently, electricity needs for lights and other tools use batteries/batteries with electric shocks charging every 2 days. Complaints about charging the charger, the battery will be damaged quickly. To overcome and save electricity, it can be used as an electric charger with solar panels. Therefore, the community service team can provide counseling and training on the installation of solar panel electrical components (solar energy) for fishing boats owned by fishermen. The problem faced by partners (fishermen) who have been complaining about this is that the batteries used are damaged quickly, because the batteries are removed too often for charging electric shocks, this hampers the economic welfare of the fishermen's families because of additional costs. The purpose of implementing this community service program is to increase applied knowledge for small-size fishing boat electricity, and by utilizing solar/solar energy components applied to ships, it can reduce costs and extend the technical life of batteries/batteries.
PENERAPAN PANEL SURYA UNTUK PENERANGAN LISTRIK PERAHU NELAYAN GUNA EFISIENSI PENGGUNAAN BATERAI Amir Marasabessy; Bambang Sudjasta; Wiwin Sulistyawati; Fajri Ashfi Rayhan; Damora Rhakasywi
Jurnal Bakti Masyarakat Indonesia Vol. 6 No. 2 (2023): Jurnal Bakti Masyarakat Indonesia
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jbmi.v6i2.25984

Abstract

In an ef ort to improve the welfare of fishing communities, the Community Service program is an alternative inempowering the economy of fishing communities. There is a fishing village in Puloampel Village, Serang Regencycarrying out fishing activities around the of shore area of Pangkalan Ikan. The livelihoods of the people inPuloampel Village are fishermen, traders and farmers. The fishing community has fishing boats, generally made ofwood, with a capacity of 3 GT to 5 GT, which rest at the Rukun Nelayan Cinta Bahari pier. The number of fishermenis 126, and the number of fishing boats operating is 38. When operating fishing boats, fishermen generally leave atnight until morning for ± 8 hours. The need for electric lighting so far has been to use batteries by recharging every2 (two) days, this has resulted in the batteries often being damaged in addition to the expensive cost of rechargingthe batteries. The aim of the Community Service activity is to implement solar power generation on fishing boats tosave battery costs. The method used is to provide counseling and training on installing solar cell panel componentson fishing boats. As a result of Community Service activities through outreach and training activities, fishingcommunity groups have been able to assemble/install and maintain solar cell panel components independently.Apart from that, the evaluation of fishing operation activities on 6 fishing boats for 6 months can reduce costs byIDR 22,140,000 so that this can provide prosperity and improve the economy for the fishing community. ABSTRAK: Dalam upaya untuk meningkatkan kesejahteraan masyarakat nelayan, program Pengabdian Kepada Masyarakatmenjadi alternatif dalam memberdayakan ekonomi masyarakat nelayan. Terdapat kampung nelayan di Desa PuloAmpel Kabupaten Serang melakukan kegiatan menangkap ikan di sekitar lepas pantai Pangkalan Ikan. Matapencaharian masyarakat di Desa Pulo Ampel sebagai nelayan, usaha dagang, dan petani. Masyarakat nelayanmemiliki perahu ikan umumnya relatif berbahan kayu kapasitas 3 GT s/d 5 GT, yang bersandar di dermaga RukunNelayan Cinta Bahari. Jumlah nelayan 126, dan jumlah perahu ikan yang beroperasi 38 unit. Dalam pengoperasianperahu ikan umumnya para nelayan berangkat malam hingga pagi hari ± 8 jam. Kebutuhan penerangan listrikselama ini menggunakan baterai dengan melakukan pengisian/charge 2 (dua) hari sekali, hal ini yangmengakibatkan baterai sering mengalami kerusakan disamping biaya charge baterai yang mahal. Tujuan kegiatanPengabdian Kepada Masyarakat adalah penerapan pembangkit listrik tenaga surya pada perahu ikan untukpenghematan biaya pemakaian baterai. Metode yang digunakan adalah memberikan penyuluhan dan pelatihanpemasangan komponen panel solar cell pada perahu ikan. Hasil dari kegiatan Pengabdian Kepada Masyarakatmelalui kegiatan penyuluhan dan pelatihan, masyarakat kelompok nelayan sudah dapat merakit/memasang danmelakukan perawatan komponen panel solar cell secara mandiri. Selain itu dari evaluasi kegiatan pengoperasianpenangkapan ikan pada 6 unit perahu ikan selama 6 bulan, dapat memberikan penekanan biaya sebesarRp.22.140.000 sehingga hal ini dapat memberikan kesejahteraan dan meningkatkan perekonomian bagi masyarakatnelayan.
Numerical Study of Cavitation Phenomenon in a Venturi Tube Rachman, Muhammad Nanda Fatur; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal La Multiapp Vol. 5 No. 4 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i4.1432

Abstract

This research aims to understand and numerically analyze the cavitation phenomenon that occurs in Venturi tubes with variations in throat length and pressure changes. This research uses Ansys Fluent 2023 R2 numerical simulation with venturi tube geometries of 25 mm, 30 mm, and 35 mm and pressures of 300,000, 600,000, and 900,000 Pa. A multiphase flow model with water liquid and water vapor is applied to predict cavitation using a mixture model. RANS steady state conditions with the k-ε turbulence model are used to solve the continuity, momentum, energy and volume fraction equations. The Schnerr-Sauer cavitation model calculates the phase transition between water-liquid and water vapor. Geometry varies by reference journal with different converging and diverging angles, outlined in tables and figures. 2D simulations are carried out using a pressure based solver with specified boundary conditions, using the Presto! for pressure solutions, and upwind and Quick schemes for discretization. The results of this research show that 1) Length throat 25 mm has the most stable distribution compared to 30 and 35 mm geometries at a pressure of 600,000 Pa. 2) The cavitation phenomenon is influenced by changes in geometry where at 35 mm geometry greater cavitation occurs in the area near the wall inlet convergent. 3) At a pressure of 900,000 Pa, the cavitation area that forms becomes larger and becomes a critical point in this journal.
Analysis of Calorific Value of Biopellet Diameter Variations through Proximate Test Asrianti, Nadia Putri; Fahrudin, Fahrudin; Rhakasywi, Damora; Martana, Budhi
Journal La Multiapp Vol. 5 No. 4 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i4.1516

Abstract

This study aims to evaluate the quality of biopellets as biomass energy fuel, focusing on physical and chemical characteristics based on the SNI 8021:2014 standard. The research method used is experimental with a non-factorial Completely Randomized Design (CRD). The raw materials used are a mixture of rambutan wood waste (Nephelium lappaceum L) and bintaro (Cerbera manghas) with tapioca flour as an organic binder. Testing includes proximate analysis (moisture, ash, volatile matter, and fixed carbon) and calorific value using an oxygen bomb calorimeter. The results show that the produced biopellets meet several parameters of the SNI 8021:2014 standard, such as moisture content, volatile matter, and fixed carbon. However, there is significant variation in ash test results among different diameters of biopellets tested. ANOVA test results indicate that mold diameter has a notation that has a significantly affect several biopellet characteristics, such as density and calorific value. This study also observed the potential for increased combustion efficiency of the produced biopellets. The results indicate that the raw material mixture used can reduce pollutant emissions during combustion. The conclusion of this study is that the use of a mixture of rambutan wood waste and bintaro with tapioca flour as an organic binder can produce biopellets with quality that meets standards for biomass energy applications.
Analisis Computational Fluid Dynamic (CFD) Pengaruh Overlap Ratio dan Jarak Bilah Berlapis pada Kinerja Turbin Angin Savonius Bilah Berlapis David, Jerico; Fahrudin, Fahrudin; Rhakasywi, Damora
ROTASI Vol 26, No 4 (2024): VOLUME 26, NOMOR 4, OKTOBER 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.4.6-12

Abstract

Abstract  The demand for energy is increasing, therefore researchers are utilizing alternative energy sources such as wind energy. Savonius is a type of vertical axis wind turbine (VAWT) that is suitable for use in low wind speed conditions, making it capable of operating in urban areas. Researchers are conducting extensive studies to improve the performance of Savonius wind turbines. The Savonius wind turbine used is a Savonius wind turbine with added layered blades. This research was conducted using the computational fluid dynamics (CFD) simulation method with an existing layered Savonius wind turbine model and varied the overlap ratio and the distance between the layered blades to determine the impact of these variations on efficiency improvement using Ansys Fluent 2022 R2 software. The variations in this study included an overlap ratio of 10% with a blade distance of 33 mm and an overlap ratio of 15% with blade distances of 22 mm and 33 mm at a wind speed of 6.46 m/s. The results showed that the layered Savonius wind turbine from previous research with a configuration of a 10% overlap ratio and a blade distance of 22 mm had the best performance with a power coefficient (Cp) of 0.173 and a torque coefficient (Ct) of 0.46. The results of this study provide an understanding of the impact of increasing the value of the layered blade distance and the overlap ratio on the performance of the Savonius wind turbine, which, if not appropriate, can reduce its efficiency. Keywords: wind energy, Savonius wind turbine, layered blades, overlap ratio, distance between layered blades
Study of Gurney Flap as Passive Flow Control Method on NACA 4418 Abhitah, Athallah Nabiel; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal La Multiapp Vol. 5 No. 6 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i6.1735

Abstract

Global problems related to the greenhouse effect and global warming have pushed research towards clean energy sources. One of the technologies of concern is wind turbines, whose performance is highly dependent on the aerodynamics of the airfoils used. This study aims to analyze the effect of input speed variation on the aerodynamic performance of NACA 4418 airfoil using gurney flap as a passive flow method. In this study, the Reynolds Averaged Navier-Stokes (RANS) method was used to calculate aerodynamic parameters, by varying the height of the gurney flap on the trailing edge of the airfoil. The results showed that the use of gurney flaps with flap height variations of 1%, 2%, and 3% of chord length was able to significantly increase the lift coefficient, with the highest increase at the flap height of 3% c. In addition, this passive method has proven to be efficient in improving aerodynamic performance without the addition of an active control system. In conclusion, variations in input speed and flap height can improve the aerodynamic performance of NACA 4418 airfoils, making this method feasible to apply to wind turbines.
Analysis of the Effect of Position and Dimension of Infrared Burner on Heat Distribution and Efficiency of Butterfly Pea Flower Drying Oven Febriana, Miftakhul Jannah; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal La Multiapp Vol. 6 No. 1 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i1.1869

Abstract

Drying is a process of reducing the moisture content of materials using thermal energy. A drying oven equipped with infrared burner technology offers improved efficiency for drying butterfly pea flowers (Clitoria ternatea); however, uneven heat distribution remains a challenge. This unevenness can result in non-uniform drying, prolonged drying times, and reduced final product quality. This study employs Computational Fluid Dynamics (CFD) simulations to model the heat transfer process within the drying oven. Six different configurations of burner positions and dimensions were examined to evaluate their effects on heat distribution and drying rates. The results indicate that more uniform heat distribution is achieved with non-aligned burner positions, while larger burner sizes generally produce better heat distribution and faster drying rates. This research highlights the importance of optimizing burner position and dimensions to maximize drying efficiency and ensure consistent product quality.
Impact of Tropical Environmental Conditions on Mechanical Cooling Tower Performance: A Case Study at PT. XYZ Prasetyo, Eko Andi; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.540

Abstract

Indonesia's tropical climate, characterized by high ambient temperatures, intense humidity, and frequent rainfall, presents significant challenges for industrial cooling systems. This research investigates how tropical climate conditions influence the operational performance of a mechanical cooling tower installed at PT. XYZ, located in Cileungsi, West Java, Indonesia. The research offers valuable insights into energy optimization and operational planning under varying weather scenarios. Data collection involved real-time measurements under nine combinations of weather and time conditions (sunny, cloudy, rainy; morning, noon, afternoon), using thermocouples, hygrometers, and an ESP32 microcontroller. Key variables observed include ambient temperature, incoming water temperature, outgoing water temperature, relative humidity, and wet bulb temperature. Multiple linear regression was employed for analysis, supported by correlation analysis, t-tests, and F-tests. The model achieved a high determination coefficient (R²) of 80%, indicating strong predictive accuracy. Partial R² analysis revealed that the outgoing water temperature contributed 77% to the variation in cooling tower efficiency, followed by ambient temperature at 65%, incoming water temperature at 54%, and relative humidity at 36%. The highest efficiency, 67%, was recorded during sunny mornings, while the lowest, 42%, occurred at rainy noon. These findings confirm that tropical environmental factors have a significant and quantifiable impact on cooling tower performance. The results are expected to support the development of adaptive and efficient energy strategies in tropical industrial contexts.
Increasing The Performance Of A 500 W Small Scale Wind Turbine Through Blade Optimization With Low Wind Speed Computational Simulation Studies Rhakasywi, Damora
ROTASI Vol 27, No 2 (2025): VOLUME 27, NOMOR 2, JULI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.2.37-48

Abstract

The world is currently facing a dual energy crisis of increasing energy needs and the negative impact of the use of fossil energy. Indonesia has large wind energy potential, spread across various archipelagic regions. Based on a study by the Ministry of Energy and Natural Resources (ESDM), the potential for wind energy in Indonesia reaches 20,000 GW, with an mean wind speed of 3-7 m/s, proper design of wind turbine blades is an important aspect to ensure optimal performance and energy efficiency under various natural conditions. This research examines the performance and strength of inverse taper type wind turbine blades for horizontal shaft wind turbines, and pays attention to the characteristics of the wind that blows in Indonesia. This research used the method: TSR (tip speed ratio) design, tip to root chord ratio with tip, airfoil variation and determination of two blade segments combine to optimize linear rotation of the reverse tapered blade. Changes are made by going through a shape and performance selection process to determine the best blade using the BEM (blade element momentum) approach. The best designed blade is made from pine wood and its structure is modeled using the finite element method (FEM) to evaluate its safety level when used. The study results show that the best blade produces a peak Cp of 0.486 at a tip speed ratio (TSR) of 5, with a TSR range for Cp above 0.3 reaching 6.444, and can be used at air velocities of up to 15 m/s featuring a factor of safety (FoS) of 1.020.
Co-Authors Abhitah, Athallah Nabiel Amir Marasabessy Armansyah Armansyah Ashfi Rayhan, Fajri Asrianti, Nadia Putri Bambang Sudjasta Bambang Sudjasta Budhi Martana Christoforus Deberland David, Jerico Dewi, Talitha Cahya Kemala Didit Widiyanto Diraharja, Rifat Satrio Dora Samaria Fahrudin Fahrudin Fajri Ashfi Rayhan Febriana, Miftakhul Jannah Francisco, Jeremi Harinaldi . Kusumo, Rayhan Suryo Lina Ayu Marcelina Nur Cholis Nurzati, Syarif Adhika Adhin Pamungkas, Eny Dewi Prasetyo, Eko Andi Rachman, Muhammad Nanda Fatur Rita Ismail Rizkiati Ramadhani, Mahirah Salwa Aurelia Ananda Rosidi, Erlia Nurbayti Shafa, Naura Sudjasta, Bambang Sulistyawati, Wiwin Suryo, Taufik Hadi Sutarya, Muhamad Farad Wiwin Sulistyawati