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All Journal Wave: Jurnal Ilmiah Teknologi Maritim Jurnal Riset dan Rekayasa Kelautan
Waskito, Dwitya Harits
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Chemistry Computer Science & IT Earth & Planetary Sciences Environmental Science Physics

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DEVELOPMENT OF ANALYTICAL STRUCTURAL MODEL FOR COMPOSITE GRILLAGE Waskito, Dwitya Harits
Wave: Jurnal Ilmiah Teknologi Maritim Vol 14, No 1 (2020)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.555 KB) | DOI: 10.29122/jurnalwave.v14i1.4136

Abstract

With the high demand and market growth for composite boats, there is a competition to design a high-quality ship which leads to thinner boat?s hull structure. To meet this objective, a highly accurate and computationally fast calculation for composite structure is needed. In ship's structure the most used configuration of the stiffeners is by using grillage. However, most of the theory of the grillage is designated for steel structure. There is a gap between steel and composites for grillage theory which will be modified especially for the deflection. There are two general methods that used in this analysis, Navier Grillage theory as the analytical method and Finite Element Analysis as the benchmark tools. To develop analytical method of composite grillages, the current method were investigated by comparing the analytical results and FEA. Two composites with high difference in Young Modulus were analyzed and the results shows that there are significant difference of results with two previous method. The deflection results of two method were analyzed with every composite elastic properties of E-Glass. Empirical equation were developed from the relation between deflection graph of two methods and composite to increase the accuracy of Navier Grillage theory for E-Glass composites grillage.
ESTIMASI PERFORMA SISTEM PROPULSI PADA KAPAL DENGAN TIPE CONTROLLABLE PITCH PROPELLER Waskito, Dwitya Harits
Oseanika Vol. 1 No. 1 (2020): Oseanika: Jurnal Riset dan Rekayasa Kelautan - Juni 2020
Publisher : Laboratory for Marine Survey Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/oseanika.v1i1.4050

Abstract

Perhitungan performa sistem propulsi sebuah kapal secara real-time sangat penting untuk dapat mengukur kualitas dan efisiensi dari komponen yang ada pada sistem propulsi itu sendiri. Metode yang telah dikembangkan berpusat kepada perhitungan pada kapal dengan tipe propeller Fixed Pitch Propeller, sedangkan untuk kapal dengan tipe Controllable Pitch Propeller metode tersebut kurang tepat jika digunakan karena perbedaan pitch pada setiap kecepatan. Oleh karena itu dibutuhkan suatu metode perhitungan analitik yang dapat digunakan secara efisien, mudah, akurat, dan dapat dilakukan pada saat kapal berlayar. Metode yang digunakan adalah mendapatkan data dari pitch pada propeller pada masing – masing kecepatan dimana dari data pitch tersebut dapat digunakan untuk mendapatkan nilai estimasi performa sistem propulsi dengan menggunakan metode engine- propeller matching. Metode perhitungan yang dilakukan pada tulisan ini dapat juga digunakan sebagai pembanding terhadap kondisi sistem propulsi kapal terkini dengan kondisi propulsi kapal pada saat commissioning. Kata Kunci: propulsi; Controllable Pitch Propeller;  pitch;  propeller; kapal riset
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