Pranaya, Adiva (2025) Engine Bed Modification of Patrol Boat to Reduce Vibration Resonance. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini berfokus pada analisis getaran pada dasar mesin sebelum dan sesudah modifikasi pada kapal patroli menggunakan Finite Element Analysis (FEA). Mengingat efek berbahaya yang dapat ditimbulkan oleh getaran terhadap integritas struktural, perhatian utama adalah memastikan tidak adanya fenomena resonansi pada struktur. Penting untuk mengidentifikasi frekuensi alami struktur dan kemungkinan frekuensi eksitasinya; setiap perubahan pada struktur setelah kapal selesai dibangun akan sulit dan mahal. Oleh karena itu, analisis getaran harus dilakukan sebelum kapal diproduksi, di mana FEA memainkan peran penting dalam memastikan integritas struktural dasar mesin. Hasil penelitian menunjukkan bahwa pada penelitian ini, pengukuran dan simulasi memiliki tingkat kesamaan, yaitu 49,5%. Beberapa perbedaan diamati akibat korosi pada struktur yang ada, yang memengaruhi karakteristik getarannya. Dasar mesin yang ada ditemukan beresonansi dengan frekuensi pengaktifan mesin propulsi utama, sehingga memerlukan modifikasi struktural untuk mengurangi resonansi getaran. Modifikasi dipandu oleh distribusi regangan energi, dengan area dengan regangan energi tinggi diperkuat untuk meningkatkan kekakuan. Analisis respons harmonik menunjukkan bahwa modifikasi tersebut efektif, dengan tingkat pengurangan getaran sebesar 27,14% pada arah X, 17,49% pada arah Y, dan 16,72% pada arah Z. Meskipun beberapa getaran meningkatkan puncak pada arah X, hal ini mungkin disebabkan oleh pergeseran frekuensi alami, yang membuatnya lebih sensitif terhadap eksitasi.
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This research focusses on vibration analysis of an engine bed before and after modification on a patrol boat by Finite Element Analysis (FEA). Due to the harmful effect on structural integrity that vibration could cause, the main concerns are to make sure that there will be no resonance phenomena on the structure. It is important to identify the natural frequency of a structure and the possible excitement’s frequency, any alteration to the structure after the ship is done will be difficult and expensive. Hence an analysis of the vibration should be conducted before the ship is in production, that is where FEA plays a crucial role in ensuring the structural integrity of the engine bed. The results show that on this research, measurement and simulation have a similarity rate of 49.5%. Some differences were observed due to corrosion on the existing structure, which affected its vibration characteristics. The existing engine bed was found to resonate with the firing frequency of the main propulsion engine, requiring structural modification to reduce the vibration resonance. The modifications were guided by energy strain distribution, with areas of high energy strain being reinforced to increase stiffness. Harmonic response analysis demonstrates that the modification was effective, with vibration reduction rates of 27.14% at X direction, 17.49% at Y direction, and 16.72% at Z direction. Although some vibration increased peaks in the X direction, this may have been caused by a shift in natural frequency, which makes it more sensitive to excitement.
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