Prigušenje vibracija trupa broda uslijed udaranja u valove

master's thesis

• Title (english): Damping ship's hull vibrations caused by slamming
• Author: Ivan Čović
• Mentor: Andrej Jokić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-12-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Precision Mechanical Engineering

Abstract

Nepoželjni utjecaj vibracija prilikom udara vala na brodsku konstrukciju stvara ograničenja koja se moraju uzeti u obzir prilikom konstrukcije brodova. Udarom vala, javlja se nepovoljan moment savijanja na sredini trupa broda zbog čega je potrebno smanjiti vibracije. U obzir se uzima fleksibilnost trupa broda za postavljanje matematičkog modela kod podrhtavanja broda (eng. whipping) koji je izložen udaru vala (eng. slamming). U ovom je radu razrađen model broda s pasivnom regulacijom u vidu dodanih masa, linearnih opruga i prigušivača. Isto tako, razrađen je i aktivni sustav regulacije kako bi se utjecalo na smanjenje odziva momenta savijanja na sredini trupa broda. Za izradu modela broda korištena je metoda konačnih elemenata, a za pasivnu su regulaciju korištene osnovne jednadžbe dinamičkog prigušivanja. Prilikom aktivne regulacije upotrijebljena je kombinacija PD regulatora.

Abstract (english)

Undesirable impact of whipping due to slamming of ship, creates limitations that must be taken into account during the construction of ships. Due to slamming, an unfavorable bending moment occurs in the middle of the ship's hull, which is why it is necessary to reduce the vibrations. The flexibility of the ship's hull is taken into account to set up a mathematical model for the whipping of the ship due to slamming. In this work, a model of a ship with passive control in the form of added mass, linear springs and dampers has been elaborated. Likewise, an active control system was developed in order to have an affect the reduction of the bending moment in the middle of the ship's hull. The finite element method was used to create the ship model, and the basic dynamic damping equations were used for passive control. During active control, a combination of PD controller was used.

• Keywords: Slamming; Whipping; metoda konačnih elemenata; pasivna regulacija; aktivna regulacija
• Keywords (english): Slamming; Whipping; finite element method; passive control; active control
• Language: croatian
• URN:NBN: urn:nbn:hr:235:526025
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-12-01 08:44:03