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All Journal MUSTEK ANIM HA Jurnal Pendidikan Biologi Indonesia Jurnal Teknik Mesin JURNAL CRANKSHAFT International Journal of Aviation Science and Engineering Jurnal Ilmiah Teknik Mesin Poros Jurnal Pendidikan Ilmu Pengetahuan Alam (JP-IPA) Al-Khair Journal : Management, Education, And Law Jurnal Pendidikan "EDUKASIA MULTIKULTURA" Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri Open Science and Technology Indonesian Science Education Journal (ISEJ) Nemui Nyimah
Kurniawan, Dondi
Teknik Mesin,Fakultas Teknik, Universitas Lampung
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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Numerical Simulation of Droplet Behavior under Varying Density Ratios Using Finite Volume-Front Tracking Method Kurniawan, Dondi; Yoanita, Yulia Venti; Pinindriya , Sinung Tirtha; Eli Kumolosari; Angga Darma Prabowo; M. Rangga Saputra
International Journal of Aviation Science and Engineering - AVIA Vol. 6 No. 2: (December, 2024)
Publisher : FTMD Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/avia.v6i2.137

Abstract

The study of droplet dynamics is very important to understand the mechanism of heat, mass, and momentum transfer in two phases. One approach to studying this phenomenon is through numerical simulation. The front tracking method is one of the techniques often used in numerical simulation of droplets to handle phase interactions in multiphase flows. This study aims to study the characteristics of droplets when they collide with surfaces with varying density values. The modeling used in this study is an interface diffusion approach using 2 types of fluids that have different properties. The domain used is Square Box-Staggered Grid. The software used is MATLAB R2024a. The results of the study indicate that the density ratio has a significant effect on the spreading factor, apex height, spreading velocity and pressure.
Effect of Gurney Flap on The Flow Separation Phenomenon on The Rear Wing Airfoil of Racing Car Kurniawan, Dondi; Yoanita, Yulia Venti; Pinindriya , Sinung Tirtha; Kumolosari, Eli; Prabowo, Angga Darma
Open Science and Technology Vol. 5 No. 1 (2025): Open Science and Technology
Publisher : Research and Social Study Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33292/ost.v5i1.150

Abstract

Background: A racing car must be able to run at high speeds. To achieve this goal, vehicle aerodynamic modifications are often carried out, one of which is adding a gurney flap (GF). The GF on a racing car function to delay the flow separation, increase the downforce value, and reduce the drag force.Aims & Methods: In this study, observations of the influence of GF were carried out by numerical simulation using Solidworks 2025 by varying the speed of 250, 320, and 400 km/h at an angle of attack of 0°, with and without GF. The aim is to obtain information on the influence of these variations on the flow separation phenomenon on the rear wing airfoil.Result: The results showed that the addition of GF caused a delay in flow separation and a decrease in wake/vortex behind the airfoil. The impact was that the drag force increased at low speeds (39.97% at 250 km/h) but showed a decrease at medium and high speeds, namely -7.91% at 320 km/h and -2.31% at 400 km/h.
Detection and Analysis Signal Energy of Piston Ring Damages on Four Strokes Engine Kurniawan, Dondi; Purboputro, Pramuko Ilmu; Siswanto, Waluyo Adi
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2024: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The purpose of this study is to develop the piston ring damage detection technique using vibration analysis. Vibration analysis was performed by measuring vibration in four stroke engine which were worn and scratched on its piston ring, then compare it with the vibrations generated by engine which had a good conditions. Tests carried out on engine rotations of 750, 1500, and 2250 rpm, where the sensor were placed on the cylinder head and cylinder block. Vibration measurement produced a signal in the time domain, which then be analysed their signal energy by manual calculation which based on trapezoidal rule. Result of the research showed that the vibration signal energy decrease in all of the strokes of the defect piston ring. It was caused by the pressure of the defect piston ring smaller than the good piston ring. The decrease of vibration signal energy in suction and compression stroke were greater than the power and exhaust stroke. Indication of piston ring defect could be shown from the decrease in the vibration signal energy in all of the strokes.
Perbedaan Hasil Belajar Antara Siswa Yang Diajar Dengan Menggunakan Media Audio Dan Media Audio-Visual Pada Kelas V Di SD Negeri 58 Kota Bengkulu Kurniawan, Dondi; Asiyah, Asiyah; Topano, Adrian
ISEJ : Indonesian Science Education Journal Vol. 3 No. 2 (2022): Mei 2022
Publisher : Yayasan Darussalam Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62159/isej.v3i2.162

Abstract

There have been many who have conducted research with the theme of Audio-Visual media and Audia Media, but there is no research on the differences in the use of these two media on student learning outcomes in science subjects. This study aims to determine differences in student learning outcomes between classes taught using audio media and audio-visual media in grade V at SD Negeri 58 Bengkulu City. This study used 2 groups, namely the VA class totaling 22 people as the experimental group and VB with 22 people as the control group. The research variable consisted of independent variables, namely audio-visual media with audio media, while the dependent variable was student learning outcomes. This type of research is quantitative. Data collection techniques are observation, documentation and multiple choice test questions. The data analysis technique used T-test. It can be seen from the results of the hypothesis using the "t" test for both groups with the results obtained, t = 2.659, while t table with df 42 at the 5% significant level is 2.018. Thus t count> t table (2.659> 2.018) which means that the working hypothesis (Ha) in this study is accepted, namely the learning outcomes of class V students who are taught using Audio-visual media are better than students who are taught using Audio-visual media on Science subject at SDN 58 Bengkulu City. Evidenced by the average value of student learning outcomes in posttest class VA higher than class VB and there are differences in student learning outcomes in science subjects between classes taught using audio media and audio-visual media in class V at SD Negeri 58 Bengkulu City
Penguatan Kompetensi Siswa SMK Jurusan Otomotif di Bandar Lampung Saputra, Rizal Adi; Kurniawan, Dondi; Sabiqunassabiqun; Nazarrudin, Rizal
Nemui Nyimah Vol. 4 No. 2 (2024): Nemui Nyimah Vol.4 No.2 2024
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/nm.v4i2.145

Abstract

With the rapid advancement of automotive technology, there is a need to improve both educational quality and practical skills to enable students to compete in the workforce. The community service activities were carried out through hands-on training that prioritizes mastery of competencies in the automotive field, from understanding basic theories to practical work in solving problems and using work tools. Emphasis was placed on strengthening problem-solving skills in addressing motorcycle damage, a key component in the Automotive Vocational curriculum. The issues presented were case studies based on real motorcycle problems, where students were given time to resolve them (Problem Solving). The students' understanding was assessed through competency tests aligned with the standards and regulations related to motorcycle damage. The results of this service showed that many students successfully solved the problems presented, but they still faced challenges in applying the Standard Operating Procedures (SOP) that adhered to the provided regulations
SOSIALISASI PELATIHANAN APLIKASI TRELLO UNTUK MENINGKATKAN MANAJEMEN ORGANISASI DI KOPI ANJOSIA Kurniawan, Dondi; Nazarrudin, Rizal; Adi Saputra, Rizal; Sabiqunassabiqun
Nemui Nyimah Vol. 5 No. 1 (2025): Nemui Nyimah Vol. 5 No. 1 2025
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/nm.v5i1.170

Abstract

Kemajuan teknologi informasi yang semakin pesat membuat platform manajemen proyek menjadi hal yang penting untuk dikuasai, terutama bagi penggiat usaha UMKM. Salah satu aplikasi mengatur kegiatan yang dapat membantu meningkatkan literasi digital dan manajemen organisasi adalah Trello. Penelitian ini bertujuan untuk mengadakan sosialisasi pelatihan penggunaan aplikasi Trello kepada pengusaha UMKM Kopi Anjosia. Metode yang digunakan adalah kegiatan Pengabdian Kepada Masyarakat (PKM) yang dilakukan oleh tim pengabdian. Materi pelatihan meliputi pengenalan aplikasi Trello, cara mengunduh dan mengaplikasikannya, serta membantu pengguna merencanakan dan menyelesaikan pekerjaan yang lebih efisien. Setelah mendapatkan pelatihan dan bimbingan dari tim pengabdian, para pegawai mampu mengoperasikan aplikasi Trello dengan baik dan dapat sistem perencanaan pekerjaan yan baik. Kegiatan PKM ini membantu pekerjaan manajemen Kopi Anjosia dalam merencakan beberapa pekerjaan yang akan datang. Diharapkan hasil dari penelitian ini dapat menjadi referensi bagi penggiat UMKM lainnya dalam memperkenalkan dan melatih penggunaan aplikasi Trello sebagai alat bantu merencanakan pekerjaan.
Co-Authors Adrian Topano Amrul Amrul Angga Darma Prabowo Asiyah Asiyah Asiyah, Asiyah Asiyah, Asiyah Deendarlianto Dinata, Ragil Alvin Ega Arya Saputra Eko Budiana Eli Kumolosari Febrini, Deni Hadi Prayitno Herawati, Sulikah Septi Indarto Indarto M. Rangga Saputra Nazarrudin, Rizal Nazarudin, Rizal Pinindriya , Sinung Tirtha Pinindriya, Sinung Tirtha Pramuko Ilmu Purboputro Rahmanita, Ulya Rizal Adi Saputra Sabiqunassabiqun Sandi, Aris Saputra, Eko Wahyu Sulikah Septi Herawati Sulikah Septi Herawati Waluyo Adi Siswanto Wiji Aziiz Hari Mukti Yulia Venti Yoanita