Kurniati, Arum dwi (2019) Analisis Kekuatan Skeg Kapal Akibat Putaran Baling-Baling. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kapal twin screw berpeluanguntuk berlayar dengansatu propeller. Ketikahanya satu propelleryang berputar,maka gaya yang diterimaskegtidak sama dengan nol, sehingga perlu dilakukan analisis kekuatan skeg. Proses perhitungan beban dan tegangan yang terjadi pada skegdilakukan dengan metode numerik, yaitu menggunakan pendekatan computational fluids dynamic dan finite element method. Pada penelitian ini, gaya yang bekerja pada skeg beruparesultan gaya dari fluidaakibat adanya putaran propeller, dengan variasi kecepatan putarsebesar 40%RPM, 60%RPM, 80%RPM dan 100%RPM. Sedangkan model skeg berupa objek 3D solid dengan mechanical propertiesbaja AH36, sertasecara sederhana skegdimodelkanseperti balok kantilever dengan tumpuan jepit pada sisi bagian atasskeg yang dilas dengan lambung kapal.Hasil penelitian ini menunjukkan bahwa, gaya dantegangan von misesketika kapal bergerak mundur lebih besar daripada ketika kapal bergerak maju, serta meningkat seiring dengan kenaikankecepatan putar propeller. Nilai tegangan von mises maksimum terbesar terjadi ketika kapal bergerak mundur dengan kecepatan putar propeller sebesar 100%RPMbernilai 43.708MPa, dimana nilai tegangan maksimum ini lebih kecildaripada nilai tegangan izin material baja AH36, sehingga dapat disimpulkan bahwa skeg masih cukup kuat dalam menerima beban fluida yang dihasilkan oleh putaran propeller.========================================================================================================Ships that use twin screw usually have high chances of only using one of its propellers during a voyage. In such occurrence where only one of the propellers runs, the resultant of the forces applied on the skeg does not equal to zero, therefore, this kind of event should be taken into further examination. Calculation process of the force and stress on the skeg are using numeric method with computational fluid dynamic and finite element method approach. In this research, the force acting on the skeg is an resultant force of fluid due to the propeller rotation, with variations in rotational speed of 40% RPM, 60% RPM, 80% RPM and 100% RPM. While the skeg model is a solid 3D object with mechanical properties of AH36 steel, and a simple skeg is modeled like a cantilever with a fixed support on the upper side of the skeg which is welded within the hull of the ship. The result of this research showed that the force and von mises stress when the ship moves backwards is greater than when the ship moves forward, and also increases as the propeller’s rotational velocityescalates. The maximum von mises stress occurs when the ship moves backwards with a rotational speed of 100%, where its RPM reaches 43,708MPa. This value is smaller than the yield stress of AH36 steel, so it can be concluded that the skeg would withstand the fluid loads from the propeller’s rotation.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | kapal, kecepatan putar propeller, skeg, tegangan von mises |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design. T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) |
| Depositing User: | Arum Dwi Kurniati |
| Date Deposited: | 06 May 2026 07:58 |
| Last Modified: | 06 May 2026 07:58 |
| URI: | http://repository.its.ac.id/id/eprint/67227 |
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