Tehno-ekonomska analiza razvoja novog tipa brodskog motora niske razine buke i vibracija

Tudor, Hana (2017) Tehno-ekonomska analiza razvoja novog tipa brodskog motora niske razine buke i vibracija. = Techno-economic assessment of new marine engine development with high noise and vibration performance. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Vladimir, Nikola.

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Abstract (Croatian)

Općenito je poznato da problemi buke i vibracija karakteriziraju gotovo sve brodove. To je posebice naglašeno kod malih brodova, putničkih brodova i velikih kruzera. Ovaj diplomski rad vezan je za problem buke i vibracija na kruzerima, koji su prvenstveno uzrokovani radom četverotaktnih dizelskih motora. Naime, većina od prezentiranih rezultata u okviru ovog rada plod je istraživanja autorice za vrijeme tromjesečnog boravka u razvojnom odjelu proizvođača brodskih motora Wärtsilä u Trstu. Štoviše, istraživanja koja su provedena u okviru ovog rada predstavljaju početni dio dugogodišnjeg istraživačkog projekta koji provodi Wärtsilä s ciljem razvoja motora niske razine buke i vibracija. U tom smislu kao glavno pitanje postavlja se dvojba trebaju li se propisane razine buke i vibracija nastojati ostvariti konverzijama postojećih motora ili razvojem potpuno novih motora. Također, potrebno je dati odgovor na pitanje jesu li samo zahvati na motoru dovoljni ili su nužni i zahvati na samoj konstrukciji broad. Stoga, u radu je dan pregled problema buke i vibracija na brodovima. Opisani su osnovni principi njihove propagacije kroz konstrukciju. Analizirani su zahtjevi klasifikacijskih društava prema tzv. klasama komfora, kao i izmereni rezultati u naravi na postojećim brodovima. Uspostavljen je odnos između poboljšanja kvalitete motora i klase komfora. Utjecaj vibracija na cijene putničkih kabina analiziran je na temelju stvarnih podataka za brodove za kružna putovanja. Naposljetku, generiran je pojednostavljeni model buke na brodovima, koji je razmatran hibridnom statističkom analizom energije kako bi se identificirali dominantni utjecajni parametri buke koje valja varirati kako bi se smanjile njene razine na brodu. Zajedno sa zaključnim razmatranjima diplomskog rada, dane su smjernice za buduća istraživanja.

Abstract

It is well known that noise and vibration are problems that are inherent to almost all ships. This is particularly emphasized in case on small ships, passenger vessels and large cruise ships. This thesis deals with noise and vibration problems onboard cruise ships that are primarily induced by four stroke diesel engines. Namely, the most of the presented research results was performed during the 3-month visit of the author to the engine producer Wärtsilä. Moreover, the investigation performed within this thesis is an initial part of long-term research project which is being performed by Wärtsilä with an aim to develop an engine with low emissions of noise and vibration. In this sense, the main issue is whether the prescribed noise and vibration levels should be achieved by conversions of existing engines, or completely new engine should be developed. Also, it is to be found whether only treatments on the engines are enough, or there are some modifications on ship structures that should be undertaken. In this work an overview of noise and vibration problems in ships is given. Basic principles of their propagation within the structure are described, together with brief description of measurement techniques. Requirements of Classification Societies on Comfort Class are analyzed in details as well as the measured full-scale results from the existing engines/ships. The relation between improvements in engine quality and comfort class is established. The influence of vibration levels on cabin prices is analyzed taking into account realistic data of cruise ship fleet. Finally, a simplified noise model is generated and analyzed by the hybrid Statistical Energy Analysis in order to specify most dominant influence parameters onboard, that should be changed to achieve lower noise levels. Together with thesis concluding remarks, recommendations for further research are given.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: buka i vibracije, glavni stroj, klasifikacijsko društvo, klasa komfora, Designer-NOISE, izvor – put – prijemnik model
Keywords (Croatian): noise and vibration, main engine, Classification Society, comfort class, Designer-NOISE, source-path-receiver model
Subjects: TECHNICAL SCIENCE > Mechanical Engineering > marine engineering
Divisions: 600 Department of Naval Engineering and Marine Technology > 650 Chair of Marine Machinery and System Design
Date Deposited: 30 Aug 2017 09:33
Last Modified: 30 Aug 2017 09:41
URI: http://repozitorij.fsb.hr/id/eprint/7847

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