Aviation in Indonesia has progressed from time to time, both in terms of existing technology and infrastructure. One of them is the development of unmanned aircraft or commonly called unmanned aircraft which is commonly abbreviated as UAV (Unmanned Aerial Vehicle). The LSU-05NG aircraft is an unmanned aircraft designed by the LAPAN Aviation Technology Center (National Institute of Aviation and Space). This aircraft is designed to meet surveillance needs or is intended for observation of a very wide area of coverage only by installing sensor devices such as cameras and FLIR (Forward Looking Infra Red). To launch this surveillance mission, the LSU05NG aircraft must have stability. Due to the light weight and also small aircraft, the stability of this aircraft will be more easily disrupted, so there is a need for stability for the LSU-05NG aircraft to carry out its mission properly. An aircraft is said to be statically stable if the lateral dimension has a value ????ɩ???? < 0, the longitudinal dimension has a value ???????????? < 0, and on the directional dimension the value ???????????? > 0. By modeling the Lsu05 new generation aircraft and analyzing the stability of the aircraft in XFLR5 software so as to obtain the roots of aerodynamic characteristics. Based on the results of analyzes conducted on XFLR5 software, the LSU-05 new generation aircraft is statically stable and changes in speed cannot affect its stability.
A solar panel will be exposed to sunlight when in use, which causes its temperature to increase. The performance of power production will be impacted if the solar panel's temperature conditions are too hot. High-temperature solar panels can reduce the amount of electrical energy generated. To prevent the temperature of the solar panels from rising too much, a cooling system is required. The proposed solution of this research is a cooling system for solar panels that makes use of heat transfer through water. The solar panels tested in this study have a tilt angle of 20 degrees. The cooling device has dimensions of 400 mm length, 278 mm width, and 20 mm height, with a wavy-type vortex generator positioned in the cooling device mounted on the underside of the solar panel. As a result of the heat flux applied to the top surface of the solar panel, it causes an increase in temperature. The resulting voltage and electric current are reduced. Computational simulations were carried out to determine the performance of the type of vortex generator used. At a cooling water flow rate of 200–600 ml/min, heat transfer with a vortex generator type B works optimally.
Pada era pesawat modern, pemasangan winglet sendiri adalah untuk mengurangi vortex pada wingtip pesawat, sehingga komponen ini dapat mengurangi gaya hambat atau drag pada pesawat sehingga bahan bakar lebih efisien. Namun, efek negatif dari pemasangan winglet ini adalah terjadinya crack pada spar sebagai komponen penyangga utama dari wing pesawat. Oleh karena itu, perlu adanya analisis yang bertujuan untuk mengetahui seberapa besar akibat dari pemasangan winglet tersebut. Untuk melakukan analisis tersebut, tentunya peneliti wajib mengetahui dimensi wing Boeing 737-500 dan jenis – jenis material yang digunakan pada wing sesuai dengan AMM ATA 6 dan jurnal penelitian sebelumya. Pada proses analisis ini, peneliti melakukan simulasi dengan menggunakan 3 variasi kecepatan yaitu 210 knot, 230 knot dan 250 knot serta pembebanan berdasarkan gaya lift maksimal yang dihasilkan oleh wing. Dengan data tersebut, maka peneliti dapat mengetahui reaksi wing melalui simulasi stress, displacement dan strain yang dihasilkan. Berdasarkan data hasil simulasi, maka dapat diketahui bahwa stress maksimal yang terjadi pada wng Boeing 737-500 tanpa pemasangan winglet adalah terletak pada titik pemasangan engine. Pada wing dengan pemasangan winglet, dapat diketahui bahwa titik stress terbesar tidak jauh berbeda dibandingkan wing tanpa winglet. Namun, beban yang dihasilkan oleh pemasangan winglet ini memiliki peningkatan 10% hingga 35% dimana nilai tersebut merupakan nilai yang cukup besar bagi struktur pesawat terbang.
<p><strong>This research is based on the fact that many domestic sugar industries operate inefficiently and have low productivity, which is seen when compared to other countries such as Thailand, India and Australia. This study aims to identify and analyze problems along the flow of the white crystal sugar production process that cause waste and then make suggestions for improvements to reduce existing waste to increase cost efficiency in the production process. The national sugar factories generally have a basic problem, namely the low level of factory efficiency, which causes a lot of waste along the flow of the production process. The right concept for solving this problem is the implementation of the Lean manufacturing method, where this method focuses on efforts to reduce waste along the flow of the production process by making continuous improvements. The research begins with a literature study and field study and then conducts observations, analyzes, brainstorms, extracts and collects data from each work unit. The first stage begins with the define which will identify all forms of waste along the production process flow, measure to determine the most critical waste, analyze to identify the factors that cause waste in the production process, improve to carry out improvement plans, and reduce waste that occurs in the production process, and control as an evaluation of improvement results. The efficiency of the production process before the improvement is 78.7%, with improvements expected to increase production efficiency by 87.0% or an increase of 8.3 points.</strong></p><p><strong>Keywords</strong> - <em>Lean Manufacturing, DMAIC, Value Stream Mapping, Waste, Production Efficiency</em></p><p><strong><br /></strong></p>
Elektroplating adalah metode finisihing yang digunakan untuk menaikkan sifat dan tampilan dari logam, hal ini dikarenakan logam utama akan dilapisi oleh ion-ion logam jenis lain. Dengan adanya proses elektroplating dapat memberikan sebuah metode yang relatif mudah dan murah untuk menaikkan sifat dan tampilan dari logam. Prinsip dasar dari elektroplating adalah logam yang ada dibagian katoda akan melepaskan ion-ion untuk selanjutnya menempel pada logam yang dihubungkan dengan anoda. Proses ini akan berjalan secara terus menerus sampai dengan arus listrik yang dialirkan dimatikan. Pada penelitian ini dilakukan proses elektroplating dengan menggunakan aluminium 2024 sebagai logam utama dan nikel seabagai logam pelapis. Variasi dari waktu yang digunakan pada proses elektroplating adalah 20 menit, 30 menit, dan 40 menit. Setelah dilakukan proses elektroplating maka selanjutnya aluminium dilakukan uji kekerasan untuk mengetahui dampak dari variasi waktu proses elektroplating. Dari hasil pengujian kekerasan menggunakan metode Hardness Vickers maka spesimen dengan nilai tertinggi terdapat pada variasi waktu 20 menit dengan nilai 328,11 kgf/mm, sedangkan yang paling rendah terdapat pada variasi 40 menit dengan nilai 140.445 kgf/mm. Dari hasil foto mikro juga menunjukkan bekas indentor pada variasi 40 menit memiliki lubang terbesar sedangkan pada waktu 20 menit yang paling kecil. Sehingga semakin lama dari proses elektroplating akan menurunkan nilai kekerasan dari aluminium alloy 2024 yang dilapisi dengan nikel.
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