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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) FLYWHEEL : Jurnal Teknik Mesin Untirta REKAYASA Communications in Science and Technology JMM (Jurnal Masyarakat Mandiri) Mekanika: Majalah Ilmiah Mekanika Indonesian Journal of Electrical Engineering and Computer Science SEMAR Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT) Automotive Experiences Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Research in Education, Technology, and Multiculture
Danardono Dwi Prija Tjahjana, Dominicus
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Sebelas Maret, 57126, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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Design of eddy current brake for electric motorcycle braking system Mufti Reza Aulia Putra; Muhammad Nizam; Dominicus Danardono Dwi Prija Tjahjana
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 1: March 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v12.i1.pp41-50

Abstract

Braking systems in motor vehicles generally use a braking system that utilizes friction. The braking performance will decrease caused by using friction rapidly. To overcome this, as an alternative, an electromagnetic braking system can be used by utilizing eddy currents, such as eddy current brakes (ECB). Eddy currents are generated when the rotor pass the magnetic field of the electromagnet. The research aim is to design an ECB system. The performance of the disk design will be determined in this study. The study is about the tendency of the ECB properties. The finite element (FEM) method is used by modeling ECB performance. The experimental results were used to validate the result. The test showed the results of braking using aluminum disk showed the best performance in 12.03 Nm. From these results, the combination of the disks is needed by an appropriate disk design.
PENGARUH SUDUT PUNTIR SUDU PADA SAVONIUS HORIZONTAL AXIS WATER TURBINE SEMICIRCULAR BLADE APLIKASI ALIRAN DALAM PIPA Syamsul Hadi; Muhammad Sidik Teja Purnama; Dominicus Danardono Dwi Prija Tjahjana
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume II Nomor 2, November 2016
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (740.284 KB) | DOI: 10.36055/fwl.v2i1.1361

Abstract

Turbin Savonius merupakan salah satu jenis turbin yang unggul dalam hal karakteristik awal (starting characteristic), mampu beroperasi pada kecepatan aliran yang relatif rendah, serta desain yang sederhana dan murah. Faktor inilah yang membuat turbin Savonius sesuai diaplikasikan untuk sistem pembangkit Piko Hidro, dimana daya keluaran yang dihasilkan sangat kecil yakni kurang dari 5 KW. Penelitian ini bertujuan untuk mengetahui turbin Savonius dengan sudut puntir ( ) yang paling optimal dan membandingkannya dengan sudu konvensional atau tanpa puntiran ( ). Penelitian dilakukan menggunakan metode computational fluid domain (CFD) dengan program SolidWorks 2011 untuk mengetahui sudut puntir yang  paling optimal. Variasi sudut puntir yang disimulasikan adalah  dan . Hasil simulasi menunjukkan sudut puntir  mempunyai nilai torsi paling tinggi. Dari hasil simulasi dapat disimpulkan bahwa sudu dengan puntiran (twisted blades) mempunyai nilai torsi yang lebih tinggi dibandingkan dengan sudu konvensional atau tanpa puntiran ( .
Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car Zainal Arifin; Suyitno Suyitno; Dominicus Danardono Dwi Prija Tjahjana; Wibawa Endra Juwana; Rendy Adhi Rachmanto; Chico Hermanu Brillianto; Ubaidillah Ubaidillah; Singgih Dwi Prasetyo; Arinal Falah Muhammad; Mohd Afzanizam Mohd Rosli
Automotive Experiences Vol. 5 No. 3 (2022)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.7067

Abstract

The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.
Design and simulation of a combined serpentine t-shape magnetorheological brake Faishal Harish Hidayatullah; Ubaidillah Ubaidillah; Endra Dwi Purnomo; Dominicus Danardono Dwi Prija Tjahjana; Ilham Bagus Wiranto
Indonesian Journal of Electrical Engineering and Computer Science Vol 13, No 3: March 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v13.i3.pp1221-1227

Abstract

A magnetorheological brake (MRB) is a device to dissipate rotational energy using magnetorheological fluids (MRF). MRB can change its braking torque quickly in response to external magnetic field strength. The brake is rotational, utilizing the MRF in shear mode. In this study, the geometrical design of the MRB, magnetic circuit and MRF flow path is addressed. Mathematical models are presented that describe the braking torque of the MRB. A novel prototype is introduced combining T-shape rotor model with serpentine flux magnetic circuit configuration. The rotor member is selected to direct the flux concentration at that location. Serpentine flux configuration is selected to achieve higher torque without increasing the size of MRB by activated more surface area of MRF with the magnetic flux. The finite element method is used to evaluate the magnetic flux density in MRB using FEMM 4.2. FEMM results showed that this novel design could provide sufficient magnetic flux along MRF flow path. Finally, the influence of input current to the MRB on braking torque is investigated. It is found that the braking torque in MRB increases with the increase of the input current. The prototype is formulated as foot-drop prevention orthotic. The MRB would be further integrated into ankle-foot orthoses for post-stroke patients. The design is formulated as a preliminary geometrical design, aiming to obtain the minimum required braking torque.
Axial Unipolar Eddy Current Brake Performance Characteristics Against Heat Increase in Rotor Mufti Reza Aulia Putra; Dominicus Danardono Dwi Prija Tjahjana; Muhammad Nizam; Zainal Arifin; Bhre Wangsa Lenggana; Inayati Inayati
Automotive Experiences Vol. 6 No. 1 (2023)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.7431

Abstract

The development of transportation technology in the automotive sector such as electric vehicles is increasingly advanced. One technology that is needed quite a lot is the development of supporting technology for electric vehicle braking. The use of regenerative braking on light electric vehicles such as 2-wheeled vehicles is not efficient because of its low weight. The use of Eddy Current Brake (ECB) can be a solution for braking support needs. This is because the ECB is a braking system that has the advantage of a lightweight design but still relies on the frictionless principle. However, in addition to its advantages, the eddy current brake is still in the early stages of its research with efficiency that still needs to be developed. In the discussion of the ECB, heat generation is one of the interesting topics to be discussed. Specifically, the study of the characteristics of the unipolar ECB axial performance on heat generation events has not yet been discussed. So this article aims to discuss these events with a simulation process and simple mathematical calculations. Design optimization is done to get the best value. As a result, the use of eddy current brakes with conductor disks using slots, can improve the performance of the ECB on the torque side and cooling side. Thus, this article is a good contribution to the sustainability of ECB research in both the general and automotive fields.
WAHANA PAPAN SELUNCUR SEBAGAI SARANA INTERAKSI ANAK DENGAN DUNIA LUAR Zainal Arifin; Rendy Adhi Rachmanto; Suyitno Suyitno; Dominicus Danardono Dwi Prija Tjahjana; Wibawa Endra Juwana; Yudin Joko Prasojo; Singgih Dwi Prasetyo
JMM (Jurnal Masyarakat Mandiri) Vol 7, No 5 (2023): Oktober
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v7i5.17476

Abstract

Abstrak: Taman bermain merupakan lingkungan yang dirancang khusus untuk menyediakan kesempatan bermain, belajar, dan berinteraksi bagi anak-anak. Taman bermain tidak hanya merupakan tempat hiburan semata, tetapi juga berperan sebagai ruang pendidikan yang mendukung perkembangan fisik, kognitif, sosial, dan emosional anak-anak. Pengabdian ini bertujuan untuk merancang desain wahana bermain papan seluncur yang dirancang dengan mempertimbangkan faktor keselamatan, kenyamanan, dan pengembangan anak di Taman Mekarsari Desa Kaligentong, Kecamatan Gladagsari, Kabupaten Boyolali. Papan seluncur merupakan sebuah wahana dengan bentuk seperti seluncuran yang difungsikan sebagai sarana anak-anak untuk berinteraksi pada lingkungan luar. Metode yang digunakan pada pengabdian ini berupa deskriptif kualitatif yang dilakukan melalui tahapan wawancara dan observasi. Pengabdian ini merupakan kolaborasi antara dosen dan mahasiswa Program Studi Teknik Mesin, Universitas Sebelas Maret, Surakarta dengan Kelompok Tani (PokTan) Desa Kaligentong, Gladagsari, Boyolali sebagai pengelola Taman Mekarsari. Evaluasi yang dilakukan untuk wahana bermain ini yaitu dengan melakukan simulasi percobaan papan seluncur secara langsung. Dari kolaborasi ini didapatkan hasil berupa desain papan seluncur yang kokoh dan dibuatnya wahana bermain papan seluncur yang aman dan nyaman di Taman Mekarsari. Diharapkan dengan adanya wahana bermain ini dapat mendorong interaksi sosial dan pengembangan keterampilan anak-anak sehingga dapat meningkatkan kualitas hidup dengan memberikan kesempatan bermain dan belajar secara menyeluruh.Abstract:  Playgrounds are environments specifically designed to provide opportunities for children to play, learn and interact. Playgrounds are not only places of entertainment, but also act as educational spaces that support children's physical, cognitive, social, and emotional development. This service aims to design a skateboard playground that is designed by considering safety, comfort, and child development factors at Mekarsari Park, Kaligentong Village, Gladagsari District, Boyolali Regency. Papan seluncur is a vehicle with a shape like a slide that functions as a means for children to interact with the outside environment. The method used in this service is descriptive qualitative which is carried out through interviews and observations. This service is a collaboration between lecturers and students of the Mechanical Engineering, Universitas Sebelas Maret, Surakarta with the Farmer Group (PokTan) of Kaligentong Village, Gladagsari, Boyolali as the manager of Mekarsari Park. The evaluation carried out for this playground is by simulating the papan seluncur experiment directly. From this collaboration, the results were obtained in the form of a sturdy papan seluncur design and the creation of a safe and comfortable papan seluncur playground in Mekarsari Park. It is hoped that this playground can encourage social interaction and skill development of children to improve the quality of life by providing comprehensive play and learning opportunities.  
The renewable energy research contribution of Tanzania: A review Shame, Buruhan Haji; Ubaidillah; Tjahjana, Dominicus Danardono Dwi Prija; Arifin, Zainal; Aziz, Muhammad; Harwijayanti, Widyanita; Haji, Mohammed M.
Communications in Science and Technology Vol 9 No 1 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.1.2024.1348

Abstract

The central objectives of this study are to locate existing research on renewable energy, examine the energy policy of Tanzania, assess bibliometric factors, determine the direction of the current research, and comprehend unexplored research topics. This exploration focuses on a bibliometric-based study using computer-assisted software tools known as VOS viewer and RStudio in analyzing the Scopus data retrieved package for the key phrase of "Renewable energy" in the article titles published from 2002 to 2022. A total of 661 publications (which is only 0.45% and 6.3% of the global and continental publications from Africa respectively) were analysed after refining using different bibliometric criteria like study site, type of document, publication stage, language used in the document, and publication time interval. The results shows that Energy fuels, engineering, technology, environmental sciences, ecology, and business economics are the most frequently studied fields. Also, from a total of 661 publications, only 32 documents were published from Tanzania for 20 years from 2022 which is less than 2 publication/year. This study concludes that there is a notable lack of research output from Tanzania in this critical field. This gap underscores the need for greater investment in renewable energy research and development within the country, as well as targeted efforts to build research capacity and foster collaboration among academia, government, and industry stakeholders.
Experimental Comparison of Double-Stage Runner Profiles in Gravitational Water Vortex Turbines for Improved Performance Risdiyanto, Gunawan; Septiyanto, Muhamad Dwi; Hadi, Syamsul; Tjahjana, Dominicus Danardono Dwi Prija; Budiana, Eko Prasetya; Andriyanto, Solikin
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.30683

Abstract

Gravity Water Vortex Turbines (GWVTs) are a new category of turbines used in micro-hydro power plants (MHPs). GWVTs can be used to optimize existing water flow potential, aerate water bodies, and maintain ecosystem integrity. The basic idea for this development stems from previous research showing that GWVTs with conical basins exhibit different flow velocity distributions at different locations. To exploit this potential, experimental analysis was conducted using a two-stage configuration with varying runner profiles and different flow rate conditions. A low-speed water tunnel with a conical basin was used to generate the vortex flow. Furthermore, the performance of the double-stage GWVT was compared with that of a single-runner GWVT in terms of power conversion. The study used several turbine configurations profiles, including Savonius and Flat with Curved. The findings measured torque, mechanical power conversion, and rotational speed. The GWVT performance results were evaluated using comparison-staging and inter-staging methods to determine the best performance of each turbine in generating power. The results showed that the Savonius blade profile on a single-runner GWVT installed in the lower stage position was superior in terms of power conversion. The best power generated is 53.7 Watts, and the efficiency is 52.3% at a flow rate of 9.1 L/s. The installation of two similar runners on a double-stage GWVT yields better power conversion than the installation of two different runners. A flat with Curved runners installed for the lower and upper stages on a double-stage GWVT shows the highest results of 56.7 Watts and 1.2 Watts. So, it can be concluded that the power conversion of a double-stage GWVT is superior to that of a single-runner GWVT.
PENERAPAN TEKNOLOGI BIOPORI UNTUK MENINGKATKAN KETERSEDIAN AIR TANAH SERTA MENGURANGI SAMPAH ORGANIK DI DESA PURON SUKOHARJO Arifin, Zainal; Tjahjana, Dominicus Danardono Dwi Prija; Rachmanto, Rendy Adhi; Suyitno, Suyitno; Prasetyo, Singgih Dwi; Hadi, Syamsul
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 9, No 2 (2020): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v9i2.43408

Abstract

Ketersediaan air tanah di Desa Puron Kecamatan Bulu Kabupaten Sukoharjo semakin menurun. Hal itu dikarenakan pengambilan air tanah yang tidak diimbangi dengan semangat konservasi dan sedikitnya air hujan yang masuk ke dalam tanah. Berkurangnya jumlah air yang ada mengakibatkan mengeringnya tumbuhan di lingkungan tersebut. Selain itu, masih banyaknya sampah rumah tangga menjadi permasalahan yang harus dihadapi masyarakat permukiman. Penanganan sampah dan irigasi secara konvensional yang telah diterapkan oleh masyarakat belum menjadi solusi terbaik. Sehingga perlu penanganan secara tersistematis, terstruktur dan berkelanjutan. Pengabdian yang dilakukan bertujuan untuk membantu masyarakat Desa Puron dalam menangani masalah air dan sampah. Pengabdian masyarakat dengan mensosialisasikan dan mengajak masyarakat untuk melakukan konservasi sumber daya air dengan penerapan teknologi sederhana dan murah. Penerapan teknologi yang bisa diterapkan yaitu dengan pembuatan lubang resapan biopori untuk meningkatkan jumlah air dalam tanah serta mengurangi sampah organik di Desa Puron. Lubang resapan biopori berfungsi sebagai tempat resapan air ke dalam tanah dan sebagai tempat pembuatan kompos dari sampah organik. Lubang resapan biopori tidak membutuhkan area luas dan proses pembuatannya sangat mudah, hal ini tentu menjadi solusi yang tepat untuk wilayah Desa Puron. Hasil pengabdian menjadikan ketersedian air yang ditandai dengan menghijaunya tumbuhan. Kata kunci: Air, Biopori, Pengabdian, Desa Puron
UJI EKSPERIMENTAL TORSI DAN DAYA MOTOR BLDC 48 V BERBASIS BATTERY PACK LiFePO₄ MENGGUNAKAN METODE PRONY BRAKE Ahmad Ilham Ramadhani; Dominicus Danardono Dwi Prija Tjahjana; Ngafwan Ngafwan
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2026): Edisi Juni
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v7i2.3228

Abstract

Nilai torsi dan daya menjadi faktor utama dalam menentukan karakteristik sistem penggerak Brushless Direct Current (BLDC) motor dengan suplai energi listrik dari baterai ion lithium (LiB). Tujuan penelitian ini adalah untuk menentukan torsi dan daya motor BLDC 48 V yang suplai oleh baterai lithium iron phosphate (LiFePO₄/LFP) menggunakan metode prony brake. Metode prony brake dilakukan dengan variasi beban W1 s.d. W5 dan variasi 200, 400, 600, 800, dan 1000 rpm. Pengujian eksperimental dirangkai menggunakan motor BLDC  dan LiB baterai pack LFP. Hasil eksperimen menunjukkan bahwa baterai pack yang digunakan berjenis LFP dengan kode rangkaian “15S12P”. Baterai pack LFP memiliki rentang tegangan 44,19 V - 55 V (charging) dan rentang tegangan 35,12 V - 53,12 V (discharging). Nilai torsi dan daya mengalami peningkatan seiring dengan penambahan rpm pada setiap variasi beban. Pada rentang operasi ini, sistem menunjukkan perubahan torsi dan daya yang lebih stabil. Nilai torsi tertinggi pada 1000 rpm (0,50 Nm; 0,55 Nm; 0,60 Nm; 0,63 Nm; 1,12 Nm) dan daya pada 1000 rpm (43,68 W; 46,77 W; 49,14 W; 50,68 W; dan 87,97 W). Informasi mengenai nilai torsi dan daya motor BLDC yang disuplai oleh baterai LFP, dapat menjadi salah satu acuan utama dalam mendukung pengembangan kendaraan rendah emisi.
Co-Authors Achmad Gustiantono Aditya Rio Prabowo Ahmad Ilham Ramadhani Andriyanto, Solikin Arinal Falah Muhammad Bhre Wangsa Lenggana Budiana, Eko Prasetya Chico Hermanu B.A. Endra Dwi Purnomo Faishal Harish Hidayatullah Haji, Mohammed M. Harwijayanti, Widyanita Hermes Carvalho Ihsan Pratama Rushadiawan Ilham Bagus Wiranto Inayati Inayati Iwan Istanto Julian Fikri Arifwardana Mahfud Alfajar Mohd Afzanizam Mohd Rosli Mohd Afzanizam Mohd Rosli Mufti Reza Aulia Putra Muhammad Aziz Muhammad Nizam Muhammad Nurfajriansyah Muslich Muhammad Sidik Teja Purnama Ngafwan Ngafwan Rachmanto, Rendy Adhi Rahman Wijaya Rendy Adhi Rachmanto Risdiyanto, Gunawan Ristiyanto Adiputra Septiyanto, Muhamad Dwi Seung Jun Baek Shame, Buruhan Haji Singgih Dwi Prasetyo Suyitno - Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Svitlana Onyshchenko Syamsul Hadi Syamsul Hadi Syamsul Hadi Trismawati Trismawati Ubaidillah Ubaidillah Ubaidillah Ubaidillah Ubaidillah Wibawa Endra Juwana, Wibawa Endra Yudin Joko Prasojo Zainal Arifin Zainal Arifin Zainal Arifin Zainal Arifin