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Alviani Hesthi Permata Ningtyas
Universitas Muhammadiyah Gresik
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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PERAWATAN ENGINE DIESEL KTA 38 G5 SEBAGAI PENGGERAK GENERATOR SARANA POWER PLANT PPSDM MIGAS CEPU RAHMAD DZIKKRUL DWI PASETYO; Alviani Hesthi Permata Ningtyas
ENIGMA: Engineering in Green Machinery Vol. 2 No. 1 (2025): Juli
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i1.10637

Abstract

Kilang PPSDM Migas merupakan unit Crude Distilling Atmospheric (CDU) yang merupakan pengolahan primer dalam pengolahan minyak bumi. operasional kilang. Power plant merupakan salah satu unit yang terdapat di PPSDM MIGAS yang bergerak di bidang Pembangkit Listrik Tenaga Diesel (PLTD). Komponen utama dalam diesel engine terdiri dari silinder liner, kepala silinder, torak (piston), batang engkol, poros engkol, roda gila, poros nok, karter, sistem bahan bakar, ring piston dan juga memiliki beberapa sistem pendukung meliputi fuel injencion system, cooling system, lubrication system, dan air intake system. Kegiatan ini bertujuan untuk menganalisis dan mendokumentasikan berbagai aspek perawatan dan perbaikan mesin Diesel Cummins KTA 38 G5. Termasuk dalam analisis dan prosedur pemeliharaan yang diperlukan. Metode penelitian ini menggunakan kualitatif yaitu dengan menggunakan dua metode untuk menganalisis kerusakan pada engine diesel di unit power PPSDM Migas Cepu, yaitu metode langsung dan metode tidak langsung. Pemeliharaan mesin cummins KTA 38 G5 dibagi menjadi dua yaitu perawatan yang dilakukan secara harian dan juga pemeliharaan yang biasa dilakukan secara berkala yaitu 250 jam, minor overhoul 1200 jam, mayor overhoul 2400 jam. Setelah dilakukannya inspeksi ditemukan beberapa masalah serius yang bisa berdampak pada performa mesin diesel, diantaranya adalah temperatur pendingin diatas normal yang disebabkan oleh hose pecah dan terjadinya kerusakan pada Cam Shaft. Dalam penelitian ini ditemukan beberapa kerusakan diantaranya yaitu hose pendinginan pecah dan camshaft yang rusak. Perawatan rutin adalah kunci untuk memastikan mesin diesel Cummins KTA 38 G5 bekerja dengan efisien dan memiliki umur yang panjang, melalui kegiatan perawatan rutin, potensi kerusakan dapat dideteksi lebih awal sehingga mencegah kerusakan yang lebih serius.
The ANALISIS EFEKTIVITAS KINERJA MESIN GAS CUTTING OTOMATIS Di PT. ANEKA JASA TEKNIK GRESIK zidan zakhroni; Alviani hesthi permata ningtyas
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i2.10929

Abstract

The effectiveness of cutting machines plays a crucial role in improving productivity within manufacturing industries, particularly in steel plate cutting processes. This study aims to analyze the performance effectiveness of the HK-12 Automatic Gas Cutting Machine at PT Aneka Jasa Teknik Gresik using the Overall Equipment Effectiveness (OEE) method. The analysis focuses on three key parameters: Availability, Performance, and Quality, based on operational data collected during the internship period. The results indicate that the machine achieved an Availability value of 95.83%, demonstrating a high level of operational readiness with minimal downtime. However, the Performance value reached only 14.13%, showing that the cutting speed is significantly below the ideal operating speed. The Quality value was recorded at 86.67%, meaning that most cutting outputs met the required standards although some defects were still present. Based on these three components, the overall OEE value was calculated at just 11.73%, far below the industrial OEE benchmark of 85%. The low OEE result is primarily attributed to poor machine performance, influenced by suboptimal cutting speed, track conditions, and operator parameter settings. Overall, improvements in machine performance, regular maintenance, and operator training are needed to enhance the effectiveness of the HK-12 Automatic Gas Cutting Machine.
The ANALISIS KEANDALAN CONVEYOR BELT DI AREA NPK2 PT. X BERDASARKAN DATA KERUSAKAN DAN WAKTU OPERASI M.Zakarsyi Lilma Abid; Alviani Hesthi Permata Ningtyas; Ajeng Tri Rahayu
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

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

Abstract

Conveyor systems play an important role in supporting material handling processes in the fertilizer industry. Continuous operation under high workloads can lead to component wear, increased failure frequency, and downtime that disrupts production continuity. These conditions highlight the need for reliability evaluation to ensure optimal conveyor performance. This research analyzes the reliability of the conveyor system at NPK Plant 2 of PT. X using historical maintenance data collected from July 2024 to June 2025. The analysis was conducted using reliability parameters, including Mean Time Between Failure (MTBF), Mean Time To Repair (MTTR), Availability, Failure Rate, and Reliability. In addition, Failure Mode and Effect Analysis (FMEA) was applied to identify critical components and determine maintenance priorities based on the Risk Priority Number (RPN). The results indicate that most conveyor units exhibit high availability and reliability; however, several units still experience relatively high downtime and repair duration. The conveyor belt component shows the highest RPN value and therefore requires priority attention in maintenance activities. Implementing more effective preventive maintenance and enhanced monitoring of critical components is expected to reduce downtime and improve the reliability and operational efficiency of the conveyor system.
A ANALISA KINERJA LOW PRESSURE HEATER (LPH) BERBASIS STANDAR ASME PTC DI PLTU UP GRESIK Moch Afifur Rosikh; Alviani Hesthi Permata Ningtyas; Ajeng Tri Rahayu
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i2.11002

Abstract

Steam Power Plants (PLTU) have an important role in providing reliable electrical energy for the community and industrial sector. One of the components that affect the thermal efficiency of the generating system is the Low Pressure Heater (LPH), which functions to heat feed water using heat from turbine extraction steam. This study was conducted at LPH 4 Unit 4 at PT PLN Nusantara Power UP Gresik with the aim of assessing the performance of the equipment based on the ASME PTC 12.1 standard, through the analysis of three main parameters, namely Terminal Temperature Difference (TTD), Drain Cooler Approach (DCA), and Temperature Rise (TR). The method used is quantitativedescriptive with operational data collection from July to August 2025. The results of the analysis show that the actual TTD value is much higher than the commissioning value, which indicates a decrease in the effectiveness of heat transfer. Meanwhile, the DCA and TR values are still close to the commissioning value so that the condensate heating and cooling process can be said to be running efficiently. The decline in performance in TTD is thought to be influenced by the age of the LPH, variations in operating loads, and suboptimal data collection patterns. These findings provide important input for PLTU managers in improving system reliability and efficiency through regular maintenance and optimizing performance monitoring methods.
Studi Eksperimental Perbandingan Kinerja Panel Surya Single Axis Solar Tracker Berbasis IoT Dengan Fixed Adri Pasua Rahman; Alviani Hesthi Permata Ningtyas
Jurnal Teknologi dan Manajemen Industri Terapan Vol. 5 No. 2 (2026): Jurnal Teknologi dan Manajemen Industri Terapan
Publisher : Yayasan Inovasi Kemajuan Intelektual

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55826/jtmit.v5i2.1898

Abstract

Penelitian ini bertujuan untuk membandingkan kinerja panel surya fixed 0° dan sistem single axis solar tracker yang memanfaatkan teknologi Internet of Things (IoT). Metode yang digunakan adalah eksperimen dengan sistem pemantauan yang berbasis Internet of Things (IoT). Sistem ini memakai ESP32, sensor INA219, BH1750, LDR, dan platform Blynk untuk memantau data secara langsung. Parameter yang diukur meliputi tegangan, arus, daya, intensitas cahaya, energi, dan efisiensi dari panel surya. Uji coba telah dilaksanakan selama 8 hari untuk mengevaluasi kinerja kedua sistem. Penelitian menunjukkan bahwa sistem single axis solar tracker bekerja lebih baik dibandingkan dengan sistem fixed 0°. Sistem ini bisa menghasilkan daya sebesar 10,64 W dengan efisiensi 30,69% dan juga dapat meningkatkan daya serta meningkatkan energi hingga 20,33%. Hasil pengujian sensor INA219 dan BH1750 menunjukkan bahwa kesalahan dalam pengukuran sangat sedikit. Ini menunjukkan bahwa sistem pemantauan yang menggunakan IoT dapat bekerja dengan baik dalam mengumpulkan data secara langsung. Secara umum, sistem single axis solar tracker lebih efektif dalam meningkatkan penyerapan energi dari sinar matahari dan memperbaiki performa panel surya dibandingkan dengan sistem fixed 0°.
Analisis Pengaruh Variasi Sudut Kopling Terhadap Kinerja Turbin Angin Savonius Single Stage Menggunakan Metode CFD habibi abyaz; Alviani Hesthi Permata Ningtyas
Jurnal Teknologi dan Manajemen Industri Terapan Vol. 5 No. 3 (2026): Jurnal Teknologi dan Manajemen Industri Terapan
Publisher : Yayasan Inovasi Kemajuan Intelektual

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55826/jtmit.v5i3.2044

Abstract

Turbin angin Savonius merupakan salah satu turbin angin sumbu vertikal yang memiliki keunggulan dalam kemampuan beroperasi secara mandiri (self-starting) pada kondisi kecepatan angin rendah. Namun demikian, dibandingkan dengan beberapa tipe turbin angin lainnya, efisiensi aerodinamikanya masih relatif rendah sehingga diperlukan upaya untuk meningkatkan performanya. Penelitian ini bertujuan menganalisis pengaruh variasi sudut kopling terhadap karakteristik kinerja turbin angin Savonius single stage tipe S dengan memanfaatkan metode simulasi Computational Fluid Dynamics (CFD). Variasi sudut kopling yang ditinjau meliputi 0°, 30°, dan 60°, sedangkan kondisi operasi menggunakan kecepatan angin 2,5 m/s dan 3,5 m/s dengan variasi Tip Speed Ratio (TSR) sebesar 0,5 dan 0,81. Simulasi dilakukan menggunakan perangkat lunak ANSYS Fluent 2023 dengan menerapkan model turbulensi k-ω Shear Stress Transport (SST). Parameter performa yang dianalisis meliputi coefficient of power (Cp), coefficient of moment (Cm), serta efisiensi turbin. Hasil simulasi menunjukkan bahwa peningkatan nilai TSR dari 0,5 menjadi 0,81 mampu meningkatkan performa turbin pada seluruh variasi sudut kopling yang diuji. Pada kecepatan angin 2,5 m/s, konfigurasi sudut kopling 60° menghasilkan performa terbaik dengan nilai Cp sebesar 0,74 dan Cm sebesar 0,91. Sementara itu, pada kecepatan angin 3,5 m/s, kinerja optimum dicapai oleh konfigurasi sudut kopling 30° dengan nilai Cp sebesar 1,25, Cm sebesar 1,24, serta efisiensi sebesar 124,8%. Selain itu, analisis distribusi kontur kecepatan, tekanan, dan pola aliran menunjukkan bahwa konfigurasi sudut kopling 30° mampu menghasilkan karakteristik aerodinamika yang lebih baik sehingga proses konversi energi angin menjadi energi mekanik berlangsung lebih efektif dibandingkan konfigurasi lainnya.
Analisis Pengaruh Spoiler terhadap Aerodinamika Mobil Jenis Urban dengan Simulasi Computational Fluid Dynamics Achmad Nadhomul Faidh Al Qodir; Alviani Hesthi Permata Ningtyas
Science and Physics Education Journal (SPEJ) Vol. 9 No. 2 (2026): SPEJ (Science and Physics Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/wbn15b42

Abstract

This study aims to analyze the effect of spoiler size variations on the Coefficient of Drag (CD) and Coefficient of Lift (CL), as well as to investigate the characteristics of velocity, pressure, and turbulent kinetic energy contours in an urban-type vehicle under various airflow velocities. The research employed a Computational Fluid Dynamics (CFD) simulation approach using ANSYS Workbench software, while the urban-type vehicle model was designed using Autodesk Inventor. Three spoiler dimensions were evaluated, namely 2200 × 500 mm, 2200 × 600 mm, and 2200 × 700 mm, under airflow velocities of 60 km/h, 80 km/h, and 100 km/h. The simulation results indicate that spoiler size variations significantly affect the aerodynamic characteristics of the vehicle. The 2200 × 500 mm and 2200 × 600 mm spoilers exhibited better aerodynamic performance by generating downforce, which contributes to improved vehicle stability. In contrast, the 2200 × 700 mm spoiler produced an increase in Lift Force that may reduce vehicle stability. Furthermore, contour analysis revealed the formation of wake regions and an increase in turbulence intensity behind the vehicle as the spoiler size and airflow velocity increased. Therefore, selecting an appropriate spoiler dimension can improve the aerodynamic performance and stability of urban-type vehicles.   Keywords: Aerodynamics, Computational Fluid Dynamics (CFD), Coefficient of Drag (CD), Coefficient of Lift (CL), Spoiler, Urban-Type Vehicle.  
Numerical Analysis of Outlet Number Effects on Temperature Distribution in a Briquette Oven Using CFD Alviani Hesthi Permata Ningtyas; Siti Duratun Rosady; Muhammad Wildanus Sholih
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 26 No. 2 (2026): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v26i2.157-166

Abstract

The performance of briquette drying systems is strongly influenced by airflow distribution and thermal uniformity within the drying chamber, which are governed by outlet configuration and internal flow patterns. However, limited studies have systematically quantified the effect of exhaust outlet arrangements on the coupled heat transfer and fluid flow behavior in industrial-scale briquette ovens. This study aims to numerically investigate the influence of single-, double-, and four-outlet configurations on airflow characteristics, temperature distribution, and overall thermal performance of a briquette drying oven. A three-dimensional geometric model representing the combustion chamber, drying chamber, and briquette racks was developed and analyzed using Computational Fluid Dynamics (CFD). Steady-state simulations were performed in ANSYS Fluent employing the standard k–ε turbulence model, with air properties, inlet velocity (9.97 m/s), and thermal boundary conditions defined based on operational data. The results reveal that outlet configuration significantly affects flow recirculation intensity and temperature uniformity across the briquette racks. The four-outlet configuration produced the most homogeneous airflow distribution and reduced thermal gradients, thereby enhancing convective heat transfer effectiveness compared to single- and double-outlet designs. Conversely, the single-outlet case exhibited pronounced recirculation zones and localized temperature variations, potentially leading to uneven drying. These findings demonstrate that optimizing outlet arrangement is a critical design parameter for improving drying efficiency and energy utilization in briquette oven systems, providing a validated numerical framework for future thermal system optimization.
Co-Authors achmad irfanto Achmad Nadhomul Faidh Al Qodir Adri Pasua Rahman Agin Viakri Dagmar Ajeng Tri Rahayu Arifin Pahlawan, Ilham Ayunaning, Kholidia Benny Arif Prambudiarto habibi abyaz Ilham Arifin Pahlawan Pahlawan Irfan Arif Evendi M.Zakarsyi Lilma Abid Moch Afifur Rosikh Mohammad Dafid Cahyono Mohammad Rizal Safri Muhammad Bima Alamsyah Muhammad Khabib Muhammad Nuril Istighfar Muhammad Wildanus Sholih Poerwo Sudirjdo Purwo Sudirdjo Rafli Pramudia Putra RAHMAD DZIKKRUL DWI PASETYO Rilo Chandra Muhamadin Rizkyansyah Alif Hidayatullah Rohmat Bahauddin Azmi Siti Duratun Nasiqiati Rosady Siti Duratun Rosady zidan zakhroni