Article Per Year (5 Year)
p-Index From 2021 - 2026
3.794
P-Index
This Author published in this journals
All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Turbo : Jurnal Program Studi Teknik Mesin JURNAL INTEGRASI JTERA (Jurnal Teknologi Rekayasa) Angkasa: Jurnal Ilmiah Bidang Teknologi Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Bakti Masyarakat Indonesia Dinamis Logic : Jurnal Rancang Bangun Dan Teknologi Electrician : Jurnal Rekayasa dan Teknologi Elektro Jurnal Industri dan Inovasi (INVASI) Journal of Sustainable Economics Jurnal Polimesin Journal Serambi Engineering (JSE) Ulil Albab
Elvi Armadani
Universitas Pembangunan Nasional Veteran Jakarta
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering 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 Social Sciences Transportation Other

Published : 25 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 25 Documents
Search

 1   2   3 
Usulan Perbaikan Lingkungan Kerja di Area Produksi Drum Besi CV. Lampung Aspalindo Wahyudi, Rizqi; Abdillah, Zaki; Armadani, Elvi
xxxx-xxxx
Publisher : Universitas Teuku Umar

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

Abstract

CV Lampung Aspalindo merupakan suatu badan usaha yang berjalan pada bidang industri manufaktur. Badan usaha ini memproduksi produk drum besi khususnya untuk produk aspal dalam drum dari produk setengah jadi hingga produk yang dapat dijual. Permasalahan perusahaan saat ini ialah belum mengkhususkan perhatiannya kepada kondisi lingkungan kerja, dan tidak ada divisi/sub-divisi yang dikhususkan untuk masalah tersebut. Masalah tempat kerja yang didapati antara lain tidak terdapatnya marker line di daerah pengerjaan produksi seperti area bahan baku, mesin, dan lain-lain. Hal lain yang ditemukan ialah beberapa barang personal pekerja dan peralatan kerja belum memiliki lokasi yang ditentukan. Pekerja di area produksi masih belum memperhatikan kondisi kebersihan dan tidak ada rotasi jadwal tugas pembersihan. Hasil dari penelitian ini adalah penilaian checklist audit di area produksi yang mendapat nilai sebesar 26% dan masuk kategori buruk, maka peluang penerapan 5S di area produksi CV Lampung Aspalindo sangat perlu untuk memperbaiki lingkungan kerja. Berdasarkan nilai evaluasi sebelum perbaikan didapatkan nilai sebesar 35% dan setelah dilakukan implementasi 5S didapatkan nilai sebesar 77%. Terdapat 11 implementasi yang berhasil dilakukan dan terdapat 6 usulan yang diharapkan dapat diimplementasikan di CV Lampung Aspalindo.
Model Pengembangan Kebijakan Inventori Joint Replenishment untuk Multi Produk dengan Mempertimbangkan Produk Substitusi Elvi Armadani; M Zaky Hadi; Dian Fajarika; Juniwati Juniwati; Hersa Dwi Yanuarso
ULIL ALBAB : Jurnal Ilmiah Multidisiplin Vol. 2 No. 8: Juli 2023
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/jim.v2i8.1963

Abstract

Pendekatan joint replenishment merupakan salah satu metode yang digunakan dalam melakukan replenishment inventori. Dengan joint replenisment. Dengan joint replenishment biaya pesan dapat diminimasi karena hanya menggunakan satu kali pengiriman untuk beberapa produk sekaligus. Contoh proses replenishment inventori yang menggunakan pendekatan ini adalah pada retailer maupun toko grosir dengan jenis produk consumer goods. Ciri dari pasar consumer goods adalah adanya kemungkinan pemenuhan demand dengan produk lain yang sejenis, sehingga dapat dikatakan produk tersebut dapat saling mensubstitusi. Selain itu, terdapat kesulitan dalam proses replenishment produk jenis ini yaitu adanya ketidakpastian demand dari sisi customer. Penelitian ini mengembangkan model inventori Maddah, dkk (2016) mengenai model joint replenishment dengan mempertimbangkan substitusi produk. Pada penelitian ini, digunakan demand dengan sifat probabilistic. Service level telah ditetapkan sebelumnya oleh perusahaan (probabilistic sederhana). Ukuran kinerja yang diperhatikan adalah meminimasi ongkos total yang terdiri dari ongkos pembelian, ongkos pemesanan, ongkos penyimpanan, dan ongkos kekurangan. Berdasarkan uji coba model, didapati hasil bahwa model joint replenishment dengan substitusi memberikan ongkos total lebih rendah dibandingkan tanpa substitusi. Selain itu, model tersebut juga sensitif terhadap perubahan harga dan perubahan ongkos simpan.
Improving Inventory Control in the Electrical Sector Using Forecasting Models: A Comparative Study of ARIMA, Exponential Smoothing, Croston, and SBA Elvi Armadani; Daniel Jeffry; Muhammad As’adi; Yulizar Widiatama
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Abstract

PT. ABC Tarahan Sector is a State-Owned Enterprise that is engaged in services to distribute electricity to the general public. PT. ABC Tarahan Sector distributes about 80% of total electricity consumption in Lampung and 20% is distributed through ABC Palembang. Material planning is one of the most important factors to meet the production targets produced every year. The purpose of this study is to determine the method with the smallest error value based on the time series data available in the company. The data used in this study is the company's material demand data in 2018-2023. The level of accuracy in the forecasting value is determined by looking at the smallest absolute error value in each method. The forecasting results will then be measured based on the value of the service level, inventory level, and inventory cost budget. The existing condition of the company produces an error value of 7.32118, the amount of material is 17,195, the service level is 95.06%, and the warehouse cost is Rp. 36,012,143,757.00. The researcher forecasts using the Arima, Exponential Smoothing, Croston, and Syntetos Boylan Approximation methods. The results of the data analysis resulted in a decrease in the error value of 31.3%, a decrease in the amount of material by 22.38%, an increase in service levels to 95.33%, and a warehouse cost savings of Rp. 182,068,361.00.
Enhancing Supply Chain Performance for Sustainable Development in the Small and Micro Industries The Role of Organizational and Local Culture, Support from Financial Institutions, and Government Revadi, Chindy E; Armadani, Elvi; Siregar, Lina Sari
Journal of Sustainable Economics Vol. 3 No. 1 (2025): Journal of Sustainable Economics
Publisher : TALENTA PUBLISHER UNIVERSITAS SUMATERA UTARA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jse.v3i1.20549

Abstract

The economic growth potential of North Sumatra is globally recognized due to the achievement of sustainable development goals. This research aims to explore the integration of environmental, social, economic, organizational, local culture, government, and financial institution support factors that can improve supply chain performance and sustainability for small and micro industries in North Sumatra. The study uses a mixed-methods approach that involves in-depth interviews and structured questionnaires to examine the central roles of these factors. The findings underscore the importance of environmental considerations in supply chain management, the impact of local cultural traditions on organizational performance, and the need for innovative economic solutions to improve efficiency and traceability by government and financial support. The research also suggests the implementation of comprehensive policies that integrate all aspects of collaboration to achieve the Sustainable Development Goals in North Sumatra, addressing deglobalization and geopolitical crises.
SOSIALISASI RISIKO LIMBAH MINYAK JELANTAH DAN SOLUSINYA Wahyuni, Fitri; Nisa, Rasya Aulia Nathania; Julian, James; Lumbantoruan, Regina Natalindah; Mahdhudhu, Fathin Muhammad; Purba, Riki Hendra; Armadani, Elvi
Jurnal Bakti Masyarakat Indonesia Vol. 8 No. 1 (2025): 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.v8i1.34381

Abstract

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.
Peramalan Jumlah Permintaan Crumb Rubber SIR 20 Menggunakan Metode Backpropagation Pada PT XYZ Tarigan, Andre Otniel; Armadani, Elvi; Wahyudi, Rizqi
JURNAL INTEGRASI Vol. 17 No. 2 (2025): Volume 17, Nomor 2, Oktober 2025
Publisher : Pusat Penelitian dan Pengabdian Masyarakat Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/ji.v17i2.7649

Abstract

PT XYZ merupakan industri manufaktur yang memproduksi crumb rubber dengan jenis SIR 20. Tahun 2021, perbandingan jumlah persediaan bahan baku dengan hasil produksi memiliki tingkat eror MAPE lebih dari 50% yang mengindikasikan bahwa model yang digunakan tergolong buruk. Selisih antara jumlah persediaan bahan baku dan jumlah produksi berpotensi meningkatkan biaya produksi. Jumlah persediaan bahan baku di atas titik optimal dapat menyebabkan meningkatnya biaya penyimpanan, sedangan jumlah persediaan di bawah titik optimal berpotensi menambah biaya produksi akibat biaya kekurangan. Tujuan penelitian ini adalah memilih model arsitektur Backpropagation dengan nilai MAPE terendah yang selanjutnya digunakan memprediksi jumlah permintaan produk SIR 20 pada tahun 2023. Arsitektur Backpropagation yang digunakan pada penelitian ini adalah (3-9-1-1), (3-10-1-1), (3-11-1-1), (3-11-1-1), dan (3-12-1-1). Variabel input dalam penelitian ini adalah tahun produksi, jumlah hari, dan harga SIR 20. Model Backpropagation (3-11-1-1) merupakan model yang memberikan hasil prediksi dengan eror terendah, yaitu 14,5%. Model tersebut memberi hasil penuruan nilai MAPE sebesar 36,5% dan peningkatan pendapatan berdasarkan selisih antara pembelian bahan baku dan penjual produk sebesar Rp 62.295.269.963,13.
Thermal Performance of a Branching-Channel Liquid Cooling System for Cylindrical Li-Ion 18650 Batteries Anggie Topan Wijaya; James Julian; Fitri Wahyuni; Riki Purba; Fathin Madhudhu; Elvi Ermadani; Adi Winarta
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 3 (2025): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i3.210-218

Abstract

Lithium-ion batteries need effective thermal management to avoid safety risks like thermal runaway. This study analyzes and optimizes a liquid cooling system. Battery Thermal Management System (BTMS) using a branching mini-channel cold plate design for eight Li-ion 18650 batteries. A Computational Fluid Dynamics model was developed to simulate performance at a 2C discharge rate with configurations of 3 (N3), 5 (N5), and 7 (N7) branches. The results, validated against experimental data, showed that all configurations kept maximum temperatures below 37°C and maintained temperature uniformity (ΔT) below 5°C. Increasing branches reduced pressure drop, with the N7 design showing the lowest ΔP of 5.16 Pa. Although it had a lower heat transfer coefficient, N7 achieved the highest J/F factor, indicating optimal thermo-hydraulic performance for liquid-cooled battery systems.
Comprehensive Analysis on the Influence of Flap Width on the Hydrodynamic Parameters of OWSC Devices Rasya Aulia Nathania Nisa; James Julian; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 3 (2025): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i3.201-209

Abstract

The growing need for renewable energy has driven significant interest in harnessing ocean wave power, particularly through Oscillating Wave Surge Converters (OWSCs). This study focuses on examining the effect of flap width on the hydrodynamic capacity of an OWSC, as flap geometry plays a crucial role in energy capture efficiency. A numerical methodology utilizing the Boundary Element Method (BEM) was employed to assess hydrodynamic parameters across both temporal and frequency domains. Five flap width variations were tested under regular wave conditions with different periods, while mesh independence and validation against experimental data ensured accuracy. The results in the time domain revealed a direct correlation between flap width and angular deviation, velocity, torque, and power output, although wider flaps exhibited less stability due to increased inertia. Frequency domain analysis indicated that each flap width had a distinct resonant peak, with narrower flaps performing best at shorter periods and wider flaps at longer ones. Notably, moderately sized flaps (W2 and W3) achieved the highest efficiency, with Capture Width Ratios exceeding 70%, outperforming wider flaps despite their larger surface area. These findings highlight the importance of optimized flap width for efficient and reliable OWSC design.
Erosion Behavior of SKD11 Tool Steel Under Different Impact Angles and Particle Velocities: A Finite Element Analysis Study Deva Ihsan Khoirunas; Purba, Riki Hendra; Situmorang, Riky Stepanus; James Julian; Fitri Wahyuni; Elvi Armadani; Fathin Muhammad Mardhudhu
DINAMIS Vol. 13 No. 2 (2025): Dinamis : In Press
Publisher : Talenta Publisher

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

Abstract

The study utilizes the Single Particle Finite Element Analysis (FEA) method with a Cowper-Symonds Strain Rate Material Model to understand the response of SKD11 tool steel to erosion under varying impact angles and velocities. In this study, SiO₂ particles measuring 0.7 mm in diameter were selected as the erodent, while the target material, SKD11, was sized at 1x1x0,5 mm. The impact angle was varied at 30, 60, and 90 degrees, and the impact velocity was set at 25 and 50 m/s. The simulation results show that SKD11 performs best at lower impact angles. It was observed that as the impact angle increases, the erosion also increases significantly, particularly at 60 degrees. Different impact angles also resulted in different erosion mechanisms on the material's surface. The impact velocity further contributed to an increase in erosion, with material failure and material reduction occurring at 50 m/s.
THE EFFECT OF OFFSET RATIO ON OFFSET JET FLOW STRUCTURE Ramadhani, Rifqi; Julian, James; Wahyuni, Fitri; Purba, Riki Hendra; Madhudhu, Fathin Muhammad; Armadani, Elvi
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4538

Abstract

Jet flow is a crucial fluid dynamic phenomenon that has been extensively studied. It is essential for various industrial applications, including surface cleaning, flow control, and cooling electronic components.  Offset jet is an innovation in jet flow configuration that offers advantages in flow pattern control by expanding the impingement area and regulating surface pressure distribution. This study employed a Computational Fluid Dynamics (CFD) approach to investigate the influence of variations in the offset jet ratio on the aerodynamic characteristics of the flow, specifically the impingement zone area, pressure coefficient distribution, and skin friction coefficient. The standard k-ε turbulence model, utilizing a structured mesh and a Reynolds number of 10,000, was employed in this research. The number of mesh elements used was a fine mesh of 200,000 with an error percentage of 0.09436%. The results of the study show that an offset ratio of 3 produces the highest cf value of 0.0047 and a stable Cp distribution of 0.218, while also providing the best impingement zone area. These findings indicate that OR 3 is the most optimal configuration in terms of aerodynamics for precision system applications, with a focus on flow pattern control and wide impingement zone coverage.
Co-Authors Abdillah, Zaki Adi Winarta, Adi Aldi Raditya Adriansyah Alek Topan Lubis Anggie Topan Wijaya Arieviana Ayu Laksmi Bima Rakha Adhitama Bima Rakha Adhitama Bunga, Nely Toding Chindy Elsanna Revadi Christian Jovie Yudhananta Daniel Jeffry Deva Ihsan Khoirunas Dian Fajarika, Dian Fathin Madhudhu Fathin Muhammad Madhudhu Fathin Muhammad Mardhudhu Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Hersa Dwi Yanuarso Hilmana Radhia Putera James Julian James Julian James Julian Juniwati Juniwati Lumbantoruan, Regina Natalindah M Zaky Hadi Madhudhu, Fathin Muhammad Mahdhudhu, Fathin Muhammad MARTINI, NI PUTU DEVIRA AYU Muchamad Oktaviandri Muhammad As’adi Nisa, Rasya Aulia Nathania Raffi Indrajati Ragil Alghifari Sendin Rainer Samuel Fourlando Ramadhani, Rifqi Rasya Aulia Nathania Nisa Rasya Aulia Nathania Nisa Revadi, Chindy E Rifqi Ramadhani Riki Hendra Purba Riki Purba Rizki Aldi Anggara Rizqi Wahyudi Saphira Anggraita Siswanto Siregar, Lina Sari Siswanto, Saphira Anggraita Situmorang, Riky Stepanus Tarigan, Andre Otniel Yulizar Widiatama