R.E.M. (Rekayasa Energi Manufaktur) Jurnal

Methods and Characteristics of Quality Control of Composite Materials

Sharipov Nuriddin — 2025-03-26

In modern industry, the demand for high-quality and reliable composite materials is increasing day by day. Ensuring the required operational properties of these materials directly depends on the methods and characteristics of their quality control. This article provides detailed information on the main and general directions of modernization programs adopted in our country, including the improvement of standard requirements, innovative, convenient, and at the same time high-performance methods of quality control and testing of composite materials. In particular, special attention is paid to the introduction of modern equipment and technologies, as well as the effective use of local raw materials and production capabilities[1,4].

Today, the development and improvement of non-destructive testing methods, precision measurement technologies, and automatic quality control systems for composite materials is becoming increasingly important. The use of ultrasonic, radiographic, thermal, optical, and electromagnetic control methods makes it possible to detect internal defects in materials, evaluate their physical and mechanical properties, and monitor the stability of technological processes. In addition, the introduction of digital technologies, artificial intelligence, and modern software complexes ensures the objectivity and accuracy of control results[2,3].

The article also analyzes international experience in ensuring the quality and reliability of composite materials, the role of certification and standardization processes, and the importance of creating regulatory frameworks adapted to the requirements of global markets. As a result, the formation of a comprehensive quality control system covering all stages — from raw material selection to final product testing — is of great importance in increasing the competitiveness of domestic composite materials and expanding their application fields

Windshield Damage Analysis on ATR 42/72-600 Aircraft at PT. DEF

Wilarso Wilarso — 2025-03-26

Windshield damage on ATR 42/72-600 aircraft at PT. DEF has caused operational disruptions, including flight delays, increased maintenance costs, and potential safety risks. Repeated damage to the Windshield is caused by various factors, namely inspection and maintenance errors, improper installation procedures, damage to the heating system or pressure distribution, glass material degradation, and exposure to extreme weather and UV rays. In this study, the analysis was carried out using a quantitative method with a fishbone diagram to identify the main causes of damage and appropriate mitigation steps. The results of the analysis showed that the main factors contributing to the damage were errors in inspection, installation errors, and material degradation. After implementing mitigation steps such as improving technician training, revising maintenance procedures, and improving material selection, there was a significant decrease in the frequency of Windshield damage. An indication of the success of these mitigation steps can be seen from the repairs carried out during January to June 2024 which succeeded in reducing damage and rejects on the Windshield by 40% compared to 2023, improving the quality of maintenance, inspection and material durability. In terms of maintenance costs for spare parts, there is a decrease in spending on purchasing spare windshields, namely USD 15,375 (PPG Inc.) x 10 units = USD 153,750 in 2023 to USD 21,915 (Saint Gobain) x 3 units = USD 65,745 in 2024 (June), which is 42% until mid-2024. This step increases operational reliability, cost efficiency, flight safety, and employee productivity, customer satisfaction also increases along with reduced flight delays and cancellations due to technical problems. Overall, the study succeeded in reducing Windshield damage and increasing the company's operational efficiency and reliability

Analysis of Pitch Angle Optimization on Horizontal Axis Wind Turbine to Increase the Coefficient of Power (Cp) Value by Simulation and Experiment

Witono Hardi — 2025-03-28

Energi terbarukan merupakan isu yang sangat penting pada saat ini. Penggunaan pembangkit listrik berbahan bakar fosil harus dikurangi secara sistematis agar tidak memberikan pencemaran lingkungan. Turbin angin merupakan salah satu pembangkit listrik energi terbarukan. Namun demikian penelitian tentang turbin angin harus senantiasa ditingkatkan karena turbin angin memiliki efisiensi yang terbatas. Tidak seperti mesin pada umumnya yang mana efisiensinya cukup tinggi. Penelitian ini bertujuan melakukan optimasi sudut pitch pada turbin angin sumbu horizontal untuk meningkatkan nilai coefficient of power (Cp) secara simulasi dan eksperimental. Optimasi ini harus dilakukan agar gaya lift yang terjadi pada bilah turbin angin sumbu horizontal memiliki nilai optimum dengan memperhatikan gaya drag yang terjadi. Sudut pitch pada turbin dibuat bervariasi dari posisi dekat hub sampai dengan posisi tip. Ada tiga jenis variasi yang dilakukan yaitu 20⁰-0⁰, 25⁰-5⁰ dan 30⁰-10⁰. Simulasi dilakukan dengan software Qblade pada tiga jenis variasi itu kemudian dilakukan eksperimen di laboratorium. Hasil simulasi dan eksperimen menunjukkan pada variasi 20-0 memiliki efisiensi paling tinggi dibanding yang lain. Hasil ini merupakan rekomendasi pada proses pembuatan bilah turbin angin sumbu horizontal.

Optimization of Steam Methane Reforming Process Through Addition of Hydrogen Gas to Hydrogen Plant in Oleochemical Industry

Erda Rahmilaila Desfitri — 2025-03-31

Steam Methane Reforming (SMR) merupakan teknologi produksi hidrogen yang beroperasi pada suhu 750-900°C menggunakan katalis berbasis nikel dengan sifat sangat endotermik. Penelitian ini mengkaji pengaruh penambahan hidrogen pada umpan sebagai alternatif optimasi proses di PT Ecogreen Oleochemicals Batam, merespons perubahan komposisi gas alam dari 86% menjadi 82% metana dan peningkatan etana-propana. Perubahan ini menyebabkan ketidakstabilan proses dan pembentukan karbon yang berlebih, mengakibatkan deaktivasi katalis ketika peningkatan rasio steam-to-carbon tidak memungkinkan karena keterbatasan operasional. Hasil penelitian menunjukkan korelasi antara suhu reformer, konsumsi bahan bakar NG, dan yield produk. Penambahan hidrogen terbukti efektif mencegah pembentukan karbon dan mempertahankan stabilitas proses. Studi ini memberikan solusi praktis untuk optimasi produksi hidrogen melalui keseimbangan penambahan hidrogen, suhu reformer, dan efisiensi bahan bakar.