Analisa Ketidakpastian Pengujian Seakeeping Model Kapal Benchmark

Rizal, Nandiko (2023) Analisa Ketidakpastian Pengujian Seakeeping Model Kapal Benchmark. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Laboratorium Hidrodinamika-Badan Riset dan Inovasi Nasional (LH-BRIN) adalah laboratorium pengujian hidrodinamika bangunan apung, untuk menjamin kualitas hasil pengujian maka LH menerapkan standar mutu laboratorium penguji berdasarkan International Organization for Standardization (ISO) 17025:2017, sesuai dengan Pedoman Mutu (PM) klausul 8 (persyaratan proses laboratorium pengujian dan kalibrasi), dan Pedoman Prosedur (PP) klausul 8.6 (evaluasi ketidakpastian pengukuran), PP klausul 8.7 (pemastian keabsahan hasil), PP klausul 8.8 (pelaporan hasil). International Towing Tank Conference (ITTC 2008) merekomendasikan International Organization for Standardization, Guide Uncertainty Measurement (ISO-GUM 1995) sebagai panduan melaksanakan analisa ketidakpastian bagi komunitas ITTC dan afiliasinya. Metode yang direkomendasikan oleh ISO-GUM adalah mengelompokkan komponen ketidakpastian ke dalam dua kategori, tipe A dan B, berdasarkan cara evaluasi. Tujuan penelitian ini bertujuan untuk menentukan nilai ketidakpastian standar (u), ketidakpastian gabungan (u_c) dan ketidakpastian yang diperluas (U) pada uji seakeeping model kapal benchmark dengan skala 1:62 yang mewakili skala penuh 186 meter, yang dilakukan di kolam uji Manoeuvering and Ocean Engineering Basin (MOB). Pengujian tersebut memiliki kesalahan/ketidakpastian hasil. Untuk alasan ini, probabilitas kebenaran dugaan untuk kesalahan percobaan, yang disebut sebagai ketidakpastian. Perhitungan ketidakpastian hasil uji seakeeping model kapal benchmark menggunakan ITTC 2017 sebagai dasar acuan. Faktor yang mempengaruhi ketidakpastian pengujian seakeeping meliputi ketidakpastian geometri, ketidakpastian kalibrasi, pengujian seakeeping free-running, dan ketidakpastian pengujian berulang untuk 3 kali pengujian, selanjutnya dilakukan perhitungan ketidakpastian kombinasi dan ketidakpastian yang diperluas.
Pengujian seakeeping dilakukan dengan menggunakan gelombang reguler, pada arah relatif gelombang terhadap arah kapal 90 dan 180 derajat, dengan tinggi gelombang Hs = 3,5 meter dan variasi periode gelombang Tw = 8,3; 10,7 dan 12,5 detik. Hasil pengujian seakeeping pada umumnya memiliki kecenderungan yang sama pada setiap mode gerak heave, pitch, dan roll. Ketidakpastian yang diperluas dengan tingkat kepercayaan 95% dari ketidakpastian RAO-Heave di semua kondisi periode selalu kurang dari 3%, ketidakpastian RAO-Pitch di semua kondisi periode selalu kurang dari 1%, dan ketidakpastian RAO-Roll di semua kondisi periode selalu kurang dari 1,2%. Ketidakpastian ini cukup kecil.
Penelitian ini akan berguna dalam memahami ketidakpastian mendasar yang terkait dengan pengujian seakeeping. Hasil penelitian ini diharapkan dapat meminimalisir dampak dari sumber ketidakpastian sehingga untuk pengujian seakeeping selanjutnya, potensi ketidakpastian dasar dapat diperbaiki.
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Hydrodynamic Laboratory-National Research and Innovation Agency (HL-BRIN), laboratory hydrodynamics for ship and offshore structure tests, to ensure the quality of the test. HL implements quality standards the International Organization for Standardization (ISO) 17025:2017 in accordance with the Quality Guidelines (PM) clause 8 (requirements for testing and calibration laboratory processes) and the Procedure Guidelines (PP) clause 8.6 (evaluation of measurement uncertainty), PP clause 8.7 (ensuring the validity of results), and PP clause 8.8 (reporting of results). The International Towing Tank Conference (ITTC 2008) recommended the International Organization for Standardization's Guide to Uncertainty Measurement (ISO-GUM 1995) as a guide for uncertainty analysis for the ITTC community and its affiliates. The method recommended by ISO-GUM is to group the uncertainty into two types, type A and B, based on the evaluation method. The purpose of this study is to determine the value of standard uncertainty (u), combined uncertainty (u_c), and extended uncertainty (U) of the seakeeping tests at the benchmark ship model with a scale of 1:62, representing the full scale of 186 meters. The test was conducted in the Maneuvering and Ocean Engineering Basin (MOB), in which the test has an error or result of uncertainty. In the uncertainty analysis of seakeeping benchmark ship models using the ITTC 2017, the source of the uncertainty was geometry, calibration, seakeeping free-running, repeated three-time testing, combined uncertainty, and expanded uncertainty. Seakeeping testing is carried out with regular waves, in the direction of the wave relative to the ship's direction of 90 and 180 degrees, with wave height Hs = 3.5 meters and variations in wave periods at Tw = 8.3, 10.7, and 12.5 seconds. The test seakeeping result generally has the same tendency in each heave, pitch, and roll motion. The expanded uncertainty with a 95% confidence level of the RAO-Heave uncertainty in all period conditions is always less than 3%, the RAO-Pitch uncertainty in all period conditions is always less than 1%, and the RAO-Roll uncertainty in all period conditions is always less than 1.2%. These uncertainties are quite small. This research will be useful in understanding the underlying uncertainties associated with the seakeeping test. The results of this study are expected to minimize the impact of sources of uncertainty so that, for further seakeeping tests, potential basic uncertainties can be corrected.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	ISO-GUM, ITTC, Ketidakpastian, Seakeeping. Keywords: ISO-GUM, ITTC, Seakeeping, Uncertainty.
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36101-(S2) Master Theses
Depositing User:	Nandiko Rizal
Date Deposited:	28 Jul 2023 02:25
Last Modified:	28 Jul 2023 03:00
URI:	http://repository.its.ac.id/id/eprint/100229

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