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Endah Yuniarti, Endah
Universitas Dirgantara Marsekal Suryadarma
Aerospace Engineering Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Nursing Physics Social Sciences Transportation Other

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Structural Evolution and Ionic Conductivity of Al2O3-Doped LLZO via Single Heat Treatment Yuniarti, Endah; Priyono, Slamet; Sindhu Hendradjaja, Simon; Setiawan, Jan; Prijono, Kusdi; Femlee R, Brity
Jurnal Ilmu Fisika Vol 17 No 2 (2025): September 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.2.157-170.2025

Abstract

This study investigates the synthesis via solid state reaction and characterization of Li₇La₃Zr₂O₁₂ (LLZO) as a solid electrolyte doped with Al₂O₃ using a one-step heat treatment (sintering at 900°C for 4 hours). Samples were prepared with doping variations; pure LLZO (0Al-LLZO), 0.25Al-LLZO, and 0.5Al-LLZO, based on the formula  with x = 0, 0.25, and 0.5, and were mixed using ball milling for 4 hours at 25 Hz. XRD and Rietveld refinement confirmed the formation of a dominant tetragonal Li₇La₃Zr₂O₁₂ phase alongside minor secondary phases. Grain sizes ranged from 1.2 to 1.3 µm, and densification improved with increasing Al content. The 0.25Al-LLZO sample exhibited the highest ionic conductivity of 2.83 × 10⁻⁹ S/cm at room temperature, representing a 2.96-fold increase over undoped LLZO. These results indicate that Al doping significantly enhances structural stability and Li-ion transport in LLZO electrolytes processed at moderate temperatures.
ANALISIS SIMULASI KAPASITAS PENGIRIMAN KARGO DARI JAKARTA KE BANJARMASIN MENGGUNAKAN METODE MAXIMUM FLOW MUSTIKO, PANGGIH JOGO; ARIFIN, MUFTI; YUNIARTI, ENDAH
JURNAL TEKNIK INDUSTRI Vol 12 No 1 (2023): JURNAL TEKNIK INDUSTRI
Publisher : Universitas Dirgantara Marsekal Suryadarma

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

Abstract

Pengiriman kargo oleh jasa ekspedisi selain melalui jalur darat juga melalui transportasi udara yang menggunakan ruang belly cargo dari pesawat angkut penumpang berjadwal. Variasi tipe pesawat angkut yang digunakan oleh berbagai maskapai menghasilkan variasi kapasitas belly cargo. Perbedaan kapasitas tersebut mempengaruhi proses pengiriman kargo apabila terdapat rute dengan transit dan ganti tipe pesawat. Penelitian ini melakukan perhitungan kapasitas maksimum dengan simulasi pada pengiriman kargo dengan rute Jakarta (CGK) ke Banjarmasin (BDJ). Kapasitas maksimum dihitung meggunakan metode maximum flow. Perhitungan diawali dengan mengumpulkan data semua rute yang menghubungkan CGK dan BDJ dan tipe pesawat yang digunakan, menghitung kapasitas kargo setiap tipe pesawat yang digunakan, dan menghitung kapasitas maksimum dengan metode maximum flow. Hasil metode maximum flow untuk semua rute penerbangan yang menghubungkan CGK menuju BDJ menghasilkan kapasitas kargo maksimum sebesar 225,8 m3 . Rute CGK-UPG-BDJ menyisakan kapasitas kargo sebesar 55,1 m3 dan rute CGK-BPN-BDJ menyisakan kapasitas kargo sebesar 55,6 m3 dikarenakan adanya perbedaan jenis pesawat. Kata Kunci: Belly Cargo, Maximum Flow, Jakarta-Banjarmasin
Numerical Simulation of Bird Strike with Varied L/D Ratio in Hemispherical-ended Cylinder Bird Model Using Coupled Eulerian Lagrangian Method Yuniarti, Endah; Sitompul, S Afandi; Warsiyanto, B Aji
Jurnal Fisika Unand Vol 12 No 4 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.4.628-638.2023

Abstract

This research studies the numerical simulation of the finite element method for bird strike using a hemispherical-ended cylinder bird model with varying length-to-diameter (L/D) ratio, namely 1.4; 1.5; 1.6; 1.7; 1.8; 1.9; and 2.0. Birds are modelled with elastic, plastic, and hydrodynamic behaviour. The bird model uses the Coupled Eulerian-Lagrangian (CEL) method with impact speeds of 100 ms-1, 200 ms-1, and 300 ms-1. The simulation results show that the Hugoniot pressure value is around 15-36 times higher than stagnation pressure in L/D 1.4; 14-36 times in L/D 1.5; 13-30 times in L/D 1.6; 12-32 times in L/D 1.7; 12-26 times in L/D 1.8; 13-30 times in L/D 1.9; and 13-29 times in L/D 2.0. It was found that the highest Hugoniot and stagnation pressure were in L/D 1.5 and 1.8, while the lowest Hugoniot and stagnation pressure were in L/D 2.0 and 1.5, respectively. In addition, the error of the numerical results of the average Hugoniot and stagnation pressure value compared to the analytic was 2.9% and 7%, respectively. 
ANALISIS PEMBEBANAN STATIS PADA STRUKTUR HEXACOPTER DRONE UNTUK PERTANIAN (DRUPER) Erlangga, Noval; Sindhu, Simon; Yuniarti, Endah
Jurnal Teknologi Kedirgantaraan Vol 9 No 1 (2024): Jurnal Teknologi Kedirgantaraan
Publisher : FTK UNSURYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35894/jtk.v9i1.100

Abstract

Menurut data dari Pusat Data dan Sistem Informasi Pertanian Sekretariat Jenderal – Kementerian Pertanian 2020, area lahan pertanian di Indonesia seluas 36.817.086 Hektar. Dengan luas lahan pertanian yang begitu potensial, petani bisa menggunakan teknologi drone untuk membantu tugas untuk meningkatkan produktifitas. Tujuan dari peneltian ini untuk mengetahui nilai kekuatan yang diterima drone dalam menahan beban pada kondisi terbang hover. Desain drone terdiri dari tiga bagian utama yaitu Body frame menggunakan material plastik polikarbonat, Support structure, dan Skid yang menggunakan material aluminium dengan konfigurasi hexacopter. Sketsa dan model drone didesain dan dirancang menggunakan perangkat lunak CAD (Computer Aided Design) Solidworks dan simulasi pembebanan struktur dilakukan menggunakan perangkat lunak CAE (Computer Aided Engineering) ANSYS Workbench. Perhitungan simulasi analisis kekuatan struktur drone dengan metode elemen hingga diperoleh nilai Regangan Von Mises sebesar 0,00089 dan Tegangan Von Mises maksimum sebesar 21,96 MPa yang terjadi pada bagian komponen Support Structure. Dimana nilai tegangan ini masih dibawah nilai kekuatan luluh (Yield Strength) materialnya yang berupa aluminium 6061-T6 yaitu sebesar 259,2 MPa, sehingga secara umum drone untuk pertanian ini dinyatakan aman.
Analisis Keandalan Main Battery Peshawar CRJ-1000 Di Maskapai Garuda Indonesia Hardiansyah, Haidar; Franciscus, Freddy; Yuniarti , Endah
Jurnal Teknologi Kedirgantaraan Vol 9 No 1 (2024): Jurnal Teknologi Kedirgantaraan
Publisher : FTK UNSURYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35894/jtk.v9i1.106

Abstract

The main battery on the CRJ-1000 aircraft is an important component in the aircraft's electrical system. The main battery functions as the main source of electric power when the aircraft is turned off or when the aircraft engine is not operating. If there is a failure in the aircraft's battery it can cause disruption to other systems so that the aircraft cannot fly or Aircraft on Ground (AOG). In Garuda Indonesia's CRJ-1000 aircraft battery, there were several findings where the battery failed before reaching the scheduled removal time. This study aims to analyze the reliability of the CRJ-1000 main battery on the Garuda Indonesia airline. The analytical method is carried out by collecting historical data on main battery failures and calculating the Mean Time Between Failure (MTBF) and Availability values for a certain period. In addition, an analysis was also carried out on maintenance procedures and replacement of the main battery carried out by Garuda Indonesia airline technicians. The results of the analysis show that the MTBF of the CRJ-1000 main battery on Garuda Indonesia airlines has a fairly good value, but there is a need for improvement in maintenance procedures and replacement of the main battery to increase availability. The recommendations proposed are evaluating the main battery maintenance and replacement procedures, as well as increasing the availability of main battery spare parts which can speed up repair times in failure situations.
ANALISIS PERBANDINGAN ON-TIME PERFORMANCE MASKAPAI PENERBANGAN ANTARA BANDARA HUSEIN SASTRANEGARA DAN BANDARA INTERNASIONAL KERTAJATI MENGGUNAKAN FLIGHTRADAR24 Abdillah, rizki Ade; Yuniarti, Endah; Shevilia, Erna
Jurnal Teknologi Kedirgantaraan Vol 10 No 1 (2025): Jurnal Teknologi Kedirgantaraan
Publisher : FTK UNSURYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35894/jtk.v10i1.157

Abstract

This study evaluates the impact of the operational transfer from Husein Sastranegara Airport to Kertajati International Airport, focusing on airline On-Time Performance (OTP) before and after the transition. The research utilizes real-time flight data from Flightradar24 and secondary data from Angkasa Pura II to analyze daily flight schedules for one month prior to (October 2023) and after (April 2024) the transfer. The data is processed to determine percentages of on-time performance, delays, and flight cancellations at both airports. Findings reveal that post-transfer, the total number of flights decreased by 5.20%, while on-time performance improved by 8.81%, from 55.78% at Husein Sastranegara Airport to 64.02% at Kertajati International Airport. Additionally, flight delays reduced by 38.56%, suggesting enhanced operational efficiency. However, the number of flight cancellations rose from 0 at Husein Sastranegara Airport to 24 at Kertajati International Airport, indicating challenges in operational adjustment at the new facility. Key factors influencing delays include military aircraft movements, weather conditions, and the operational adjustments required following the airport transfer.
Resolution of Business Disputes in the Aviation Industry: The Role of Law and Arbitration Suryawan, Ryan Firdiansyah; Sungkono; Endah Yuniarti
Journal of Law, Politic and Humanities Vol. 4 No. 1 (2023): (JLPH) Journal of Law, Politic and Humanities (November - December 2023)
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/jlph.v4i1.358

Abstract

The purpose of this study is to explore the legal framework governing dispute resolution, examine the practice of using arbitration, identify the challenges faced, and provide recommendations to improve the effectiveness of business dispute resolution in the aviation industry. Conduct a review of the relevant literature to understand the legal framework governing business dispute resolution in the aviation industry, as well as practices and trends in the use of arbitration. Analyze data obtained from literature studies, case analysis, and, trends, and findings relevant in the context of business dispute resolution in the aviation industry. The role of arbitration law and implementation in the resolution of business disputes in the aviation industry is of significant importance. Law governs operational aspects and handles conflicts, while arbitration offers efficient and transparent solutions. The focus on investment risk prevention, regulatory updates, and negotiation methods demonstrate efforts to improve a conducive business environment. Consumer protection and law enforcement are necessary to ensure fairness for all parties. Thus, efforts to increase the role of arbitration law and implementation can bring great benefits in the aviation industry.
The Effect of Cross-section and Elliptical Hole Ratio on Crashworthiness Parameters of Crash-Box Structure Warsiyanto, Budi Aji; Widanto, Muhammad Hadi; Musthofa, Ilham; Maulana, Ichsan; Sitompul, Sahril Afandi; Yuniarti, Endah
Indonesian Journal of Aerospace Vol. 19 No. 1 (2021)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2021.v19.a3408

Abstract

The thin-walled column structure or crash-box with metal material and consisting of multi-cell were found to be much more efficient in energy absorption than single-cell under axial impact loads. In this study, a numerical analysis was performed using the Abaqus finite element method for the cross-section differences in thin-walled column structures. The cross-section differences are compared to get a configuration that complies with the indicator parameters using the complex proportional assessment (COPRAS) method. The chosen cross-section configuration is further enhanced by creating elliptical holes with different diameter ratios. The results show that the thin-walled column structure with nine-cell cross-section accompanied by an elliptical hole ratio of 0.3 indicates the potential corresponding to the indicator parameters for the crashworthiness application.
The effect of Impact Angle on Dynamic Response of 19 Passenger Commuter Aircraft Windshield against Bird Strike Warsiyanto, Budi Aji; Nurrohmad, Abian; Fitriansyah, Rizky; Utama, Agus Bayu; Sitompul, Sahril Afandi; Yuniarti, Endah
Indonesian Journal of Aerospace Vol. 19 No. 2 (2021)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2021.v19.a3560

Abstract

This paper's objective was to determine the dynamic response of a 19 passenger commuter aircraft windshield to impact angle variations. The phenomenon was performed using the finite element method, and the smoothed particle hydrodynamics (SPH) was chosen as a method for modeling bird material. The elastic-plastic polymethyl methacrylate (PMMA) material with the maximum principal strain failure criterion was used to model the windshield's dynamic response. The variation of the impact angle consists of 15°, 0°, -8°, and -15°, which are measured of the longitudinal axis of the aircraft. The simulation result showed that the impact angle that causes the windshield's dynamic response in the elastic, plastic deformation, and the greatest failure is the angle -15°. The upper end of the windshield (fixed) is the weakest part due to the stress concentration.
EFFECT OF FLAT AND HEMISPHERICALLY ENDED CYLINDER BIRD MODEL WITH FINITE ELEMENT MODELLING OF BIRD STRIKE Yuniarti, Endah; Sitompul, Sahril Afandi
Indonesian Journal of Aerospace Vol. 17 No. 1 Juni (2019): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2019.v17.a3061

Abstract

This research studies influence of bird model on impact pressures during bird strike, namely Hugoniot and Stagnation pressure through initial modelling by numerical simulations using finite element method. Finite element simulation of bird strike have primarily modelled the bird as either a flat or hemispherically ended cylinder. The geometry is simulated with different L/D ratio, 1.4, 1.6, 1.8 and 2.0. Elastic-plastic hydrodynamic material model is used in simulation. Bird model simulation are using lagrangian method and initial velocities are 100, 200 and 300 m/s. Simulation results of hemispherically ended cylinder bird models show variation of L/D ratio provide Hugoniot pressure 10-19 times higher than stagnation pressure in L/D = 1.4, 8-18 times in L/D = 1.6, 9-17 times in L/D = 1.8 and 4-16 times in L/D = 2. The Hugoniot pressure shows a lower value at an L/D ratio of 1.6 compared to other ratios and the Stagnation pressure is higher at L/D ratio 2. As for cylindrical bird model show variation of L/D ratio provide Hugoniot pressure 35-38 times higher than stagnation pressure in L/D = 1.4, 30-47 times in L/D = 1.6, 31-52 times in L/D = 1.8 and 28-48 times in L/D = 2. The Hugoniot pressure shows a lower value at an L/D ratio of 1.4 and 1.6 compared to other ratios and the Stagnation pressure is higher at L/D ratio 2.
Co-Authors AA Sudharmawan, AA Abdillah, rizki Ade Aditia Kusuma Wibawa Adnan Agus Bayu Ahmad Akmal Said Aji W, Budi Alam, Ganda Tri Albi Nuari Hastono Alimin, Edy K. amat chaeroni Ananda Rafi Rijalul Awwal Ashari, Muhammad Yazid Ayu Martina Bekti Yulianti Borris Y Maningka Budi Aji Warsiyanto Candra Pranoto Cynthia Rahmawati Dwi Juniarsah, Fahri Edy K. Alimin Edy Suwondo, Edy Enggar Kristian Erlangga, Noval Erna Shevilia Agustian fahmins Fairuza, Syarifah Femlee R, Brity fitriansyah, Rizky FORTUNE JR OMBUH Freddy Franciscus Ganjar Muhammad Nur H, Simon Shindu Hardiansyah, Haidar Israq Mifan Junaidi Jan Setiawan Jauharul Akfiya sudjaelan Kusdi Prijono Mahasir, Mahasir Maulana, Ichsan mokhamad khoiruddin muftiarifin Muhamad Jayadi Muhammad Hadi Widanto Musthofa, Ilham MUSTIKO, PANGGIH JOGO Nila Safiana Sari Nurrohmad, Abian Pramana, Nurhadi Rafika Arum Sari Rayhan Zhafrando, Muhammad Riskha Agustianingsih Rizky fitriansyah S Afandi Sitompul Sahril Afandi S Said, Ahmad Akmal Septian, Diaz Setiyawati, Defi Simon Sindhu Hendradjaja Sitompul, S Afandi Slamet Priyono Somadi, Ridho Misbahudin Sopyan Gigih Nugraha Sungkono suryawan, ryan firdiansyah Suryo O, Ari Suwardi, Arie Prasetya Syaiful Rifki Tambunan, Pangihutan Tri Susilo Tri Widayatsih Utama, Agus Bayu Wildan Sofary Darga