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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Majalah Ilmiah Pengkajian Industri Wave: Jurnal Ilmiah Teknologi Maritim
Indiaryanto, Mahendra
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Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering Transportation

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ANALISIS DISTORSI DAN TEGANGAN SISA PADA POROS KAPAL TERHADAP PERLAKUAN PANAS (QUENCHING) MENGGUNAKAN FEM Indiaryanto, Mahendra
Wave: Jurnal Ilmiah Teknologi Maritim Vol 7, No 1 (2013)
Publisher : Wave: Jurnal Ilmiah Teknologi Maritim

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.9 KB) | DOI: 10.29122/jurnalwave.v7i1.3198

Abstract

Pada bidang perkapalan sistem propulsi kapal merupakan salah satu bagian yang penting. Dimana poros kapal terbuat dari silinder pejal yang mempunyai kekerasan struktur dan kuat tarik material. Sehingga apabila diberikan perlakuan panas (Quenching) akan meningkatkan kekerasan dan kuat tarik struktur poros, serta terjadi perubahan distorsi dan tegangan sisa. Jadi dengan adanya perubahan ini perlu di analisa, sehingga pengaruh distorsi dan teganagan sisa tidak melebihi batas yang di izinkan. Analisa ini menggunakan Metode Elemen Hingga (Finite Element Methods) dengan bentuk silinder pejal (poros).
Analisa Perubahan Panjang Model FPU Barge Terhadap Koefisien Linier dan Kuadratik Roll Damping Ali, Baharuddin; Indiaryanto, Mahendra; Permana, Chandra; Widodo, W
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 15, No 3 (2018): Oktober
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (910.572 KB) | DOI: 10.14710/kapal.v15i3.19727

Abstract

Roll damping sangat berperan penting pada maksimum roll terutama pada daerah resonansi disekitar roll natural period. Dalam prediksi gerak roll, prediksi roll damping dilakukan dengan metode difraksi radiasi yang  menambahkan viscous roll damping dari formulasi semi empiris maupun dari uji roll decay. Pada uji roll decay akan didapatkan koefisien komponen roll damping linier dan quadratik yang selanjutnya diperlukan dalam perhitungan nilai roll damping. Nilai koefisien roll damping ini bisa diperoleh dengan melakukan fitting hasil uji roll decay dengan metode Froude maupun Bertin. Pada studi ini dilakukan analisa terhadap perubahan roll damping dan akibatnya terhadap gerak roll pada dua buah model FPU barge yang identik namun berbeda dimensi. Perubahan dimensi model benda apung akan menimbulkan perubahan pula pada karakteristik koefisien linier maupun quadtatik roll dampingnya. Dari hasil pengujian model diketahui bahwa pengurangan dimensi panjang model dengan posisi relatif titik berat dan jari-jari girasi roll tetap akan menaikan nilai koefisien roll damping 21% dari desain induknya. Kenaikan nilai koefisien roll damping didominasi oleh komponen linier. Dengan adanya kenaikan koefisien roll damping pada model yang lebih pendek menyebabkan turunnya nilai respon gerak roll melalui uji seakeeping.
ANALISIS DISTORSI DAN TEGANGAN SISA PADA POROS KAPAL TERHADAP PERLAKUAN PANAS (QUENCHING) MENGGUNAKAN FEM Indiaryanto, Mahendra
Wave: Jurnal Ilmiah Teknologi Maritim Vol 7, No 1 (2013)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.9 KB) | DOI: 10.29122/jurnalwave.v7i1.3198

Abstract

Pada bidang perkapalan sistem propulsi kapal merupakan salah satu bagian yang penting. Dimana poros kapal terbuat dari silinder pejal yang mempunyai kekerasan struktur dan kuat tarik material. Sehingga apabila diberikan perlakuan panas (Quenching) akan meningkatkan kekerasan dan kuat tarik struktur poros, serta terjadi perubahan distorsi dan tegangan sisa. Jadi dengan adanya perubahan ini perlu di analisa, sehingga pengaruh distorsi dan teganagan sisa tidak melebihi batas yang di izinkan. Analisa ini menggunakan Metode Elemen Hingga (Finite Element Methods) dengan bentuk silinder pejal (poros).
Effect of the Addition of Hydrofoil on Lift Force and Resistance in 60 M High-Speed Vessel Ismail, Izzuddin Nadzir; Manik, Parlindungan; Indiaryanto, Mahendra
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 17, No 3 (2020): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v17i3.28772

Abstract

The development of sea transportation technology is needed to meet the demand for ships that can carry heavier loads and operate at high speeds. Modifications in the form of additional hydrofoil variations were conducted to produce higher lift and reduce the resistance generated by the ship so that the ship can go more efficiently at high speed. This study aims to obtain the effect of adding hydrofoil to ships with variations in the type and shape of foil and find out which types and shapes can reduce resistance on the ship. This research was conducted with several model analysis tests using Computational Fluid Dynamic (CFD) based software, namely Tdyn, at several different speeds. The results of this study show that of the six variation models analyzed, rectangular fully submerged foil models can reduce the total resistance value of the ship by 17.822% from the original ship on Froude Number (Fr) 0.670. The type and shape of the foil is very influential on the lift and resistance produced by the ship.
DESIGN AND ANALYSIS OF CAVITATION ON 22 M SUBMARINE PROPELLERS Indiaryanto, Mahendra; Setyanto, Taufiq Arif; Puryantini, Navik; Asrowibowo, Nurwidhi
Majalah Ilmiah Pengkajian Industri Vol. 14 No. 2 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v14i2.4208

Abstract

Many methods approach in designing a propeller for a 22 m submarine, which is based on the literature of propeller design that has been widely publicized, specifically the type B-series propeller. From the B-series propeller design, it can be known that the performance diagram in the form of the propeller coefficient is finally correlated with the 22m submarine resistance value that has been tested at BTH-BPPT. This study's objective is to produce a propeller design with good hydrodynamic aspects, especially propeller with high efficiency and cavitation phenomena that do not occur on the propeller. The implementation of this research can be done by modification on the skew angle on the B-series propeller. It is expected to choose the right B-series propeller and skew angle propeller modification, capable of providing high-efficiency values and loss of cavitation in the leaf area of the propeller. The production of propeller models is needed for conducting an open water test in the Towing Tank and the cavitation test in the cavitation tunnel at the Hydrodynamics Technology Center for the Agency for Assessment and Application of Technology (BTH – BPPT).Key Word: Design; Propeller; Cavitation
Co-Authors Asrowibowo, Nurwidhi Baharuddin Ali, Baharuddin Ismail, Izzuddin Nadzir Parlindungan Manik Permana, Chandra Puryantini, Navik Setyanto, Taufiq Arif W Widodo