The continuous increase in electrical energy requirements as well as the decreasing amount of fossil fuels has led to the rapid development of studiesin the field of renewable energy, one of which is wind energy. Wind energy with wind turbine was chosen due to its commercial acceptability such as low cost, ease of operation, and maintenance along relatively much less time from concept to operation. One of the important components in a turbine is the blade, the function of the blade is to trap the wind which is then forwarded to the generator. Therefore, this study aims to design, manufacture, and test blades for inversed taper NACA 4412, using a composite Empty Fruit Bunch (EFB) fiber combined with fiberglass. The wind turbine wasplaced above building at a height of ±15m and the data taken were in the form of wind speed, air temperature, voltage, and shaft rotation speed. Data collection was carried out using Arduino Uno, which was recorded on the data logger for 4 days and at the maximum speed, the power obtained was48.2 Watt. Furthermore, the highest coefficient performance value obtained was 0.17 with a tip speed ratio value of 0.89 at a wind speed of 3.27 m/s.
Tanaman siwalan atau biasa disebut tanaman lontar adalah salah satu sebuah inovasi terbaru dalam pemanfaatan serat alam yang selama ini belum begitu banyak digunakan, siwalan atau lontar selama ini hanya masih dimanfaatkan pada buah dan daun lontar yang digunakan sebagai kerajinan, untuk pemanfaatan serat lontar belum begitu banyak dimanfaatkan karena belum banyak yang memahami akan kegunaan dan fungsi serat alam atau serat pada pelepah lontar. Dalam penelitian ini serat lontar adalah bahan utama dalam pembuatan komposit selain resin dan katalis, penelitian ini bertujuan untuk mengetahui kekuatan sebenarnya pada serat pelepah lontar dengan beberapa variasi dengan melakukan pengujian uji tarik pada komposit dengan bahan utama serat lontar, selain itu juga untuk mengetahui kekuatan nodulus elastisitas dan regangan pada komposit tersebut serta mengetahui sifat fisik pada spesimen tersebut dengan melakukan uji makro. Pembuatan komposit berawal dari pengambilan serat dari pelepah lontar yang sudah dipotong-potong sesuai ukuran dan sudah dikeringkan pada sinar matahari, setelah itu serat dilakukan perendaman pada larutan NaOH sebesar 5% selama 120 menit untuk menghilangkan lapisan lignin pada serat, setelah itu melakukan pembuatan spesimen uji tarik dengan variasi fraksi volume serat yang berbeda yaitu variasi fraksi volume serat 0%,5%,10%,15% , serta menggunakan variasi arah serat yang berbeda yaitu arah serat searah dan arah serat acak. Untuk nilai kekuatan rata-rata uji tarik didapat pada variasi fraksi volume serat 15% dan arah serat searah dengan kekuatan tarik sebesar 36,35 MPa, dengan nilai regangan sebesar 6,86%, sedangkan nilai kekuatan tarik terendah didapat pada fraksi volume serat 0% dengan kekuatan uji tarik sebesar 13,05MPa, dengan nilai regangan sebesar 5,32%. Kata kunci: komposit, polyester, serat lontar, uji tarik
PT Pudak Scientific is a company engaged in the manufacture of aircraft parts industry. Meeting the precise and timely demand of aerospace parts from customers becomes a major corporate responsibility. However, Loss Revenue often occurs due to engine breakdown. So that cause because the production target is not achieved, the product reject, and the delay of delivery. One of the machines that often experience breakdown is Mori seiki NH4000 DCG. Mori seiki NH4000 DCG is the finishing machine for Blank fork End product. The demand for this part is quite large, making it a tough task for the Mori Seiki NH4000 DCG machine. But because the breakdown of the machine is high enough to cause production targets every month are often not met. In addition, Maintenance activities that have not noticed the characteristics of engine damage, as well as the distribution of historical data of the machine causing less effective and efficient actions resulted in substantial Maintenance costs. Based on the results of risk analysis of Mori Seiki NH4000 DCG engine damage, in terms of performance loss system caused by a large enough that is 3.773% of machine production capacity per year. This figure exceeds the risk acceptance criteria by the company that is 2%. Therefore it is necessary to find the appropriate Maintenance policy for the Mori Seiki NH4000 DCG machine. The approach is to use Reliability Centeres Maintenance and Risk Based Maintenance. Based on the above two approaches obtained the appropriate interval time so that the Maintenance activities more effective and can improve the efficiency of treatment by reducing the cost of care previously Rp167.506.286, - per year, to Rp 96.147.061, - per year. With the policy is expected to reduce engine breakdown and performance loss caused. So the number of risks that arise for the future are within the criteria of acceptance set by the company. Keywords: Preventive Maintenance, Reliability centered Maintenance, risk based Maintenance, Performance loss
PT Pudak Scientific is a company engaged in the manufacture of aircraft parts industry. Meeting the precise and timely demand of aerospace parts from customers becomes a major corporate responsibility. However, Loss Revenue often occurs due to engine breakdown. So that cause because the production target is not achieved, the product reject, and the delay of delivery. One of the machines that often experience breakdown is Mori seiki NH4000 DCG. Mori seiki NH4000 DCG is the finishing machine for Blank fork End product. The demand for this part is quite large, making it a tough task for the Mori Seiki NH4000 DCG machine. But because the breakdown of the machine is high enough to cause production targets every month are often not met. In addition, Maintenance activities that have not noticed the characteristics of engine damage, as well as the distribution of historical data of the machine causing less effective and efficient actions resulted in substantial Maintenance costs. Based on the results of risk analysis of Mori Seiki NH4000 DCG engine damage, in terms of performance loss system caused by a large enough that is 3.773% of machine production capacity per year. This figure exceeds the risk acceptance criteria by the company that is 2%. Therefore it is necessary to find the appropriate Maintenance policy for the Mori Seiki NH4000 DCG machine. The approach is to use Reliability Centeres Maintenance and Risk Based Maintenance. Based on the above two approaches obtained the appropriate interval time so that the Maintenance activities more effective and can improve the efficiency of treatment by reducing the cost of care previously Rp167.506.286, - per year, to Rp 96.147.061, - per year. With the policy is expected to reduce engine breakdown and performance loss caused. So the number of risks that arise for the future are within the criteria of acceptance set by the company.
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