Načrtovanje odmevne komore

Vrtovec, Tomaž (author), Prezelj, Jurij (mentor)

V okviru naloge je bila zasnovana alfa komora za postavitev v Laboratorij za delovne stroje in tehnično akustiko na Fakulteti za strojništvo v Ljubljani. Alfa komora bo namenjena meritvam koeficienta absorpcije zvoka in zvočne moči majhnih naprav. Na podlagi pregleda literature in obstoječih rešitev so se identificirali in definirali ključni akustični parametri, geometrijske smernice in druge zahteve pri snovanje alfa komore. Na poenostavljenih 3D modelih je bila po metodi končnih elementov izvedena numerična analiza homogenosti distribucije lastnih frekvenc zvočnega polja v notranjem volumnu, na podlagi katere je bila na koncu določena geometrija komore. Na podlagi numerične analize frekvenčnega odziva nosilne konstrukcije ob vzbujanju z zvočnim signalom je bil izbran tudi optimalni material in dimenzije sestavnih elementov nosilne konstrukcije. Izdelan je bil podroben 3D model nosilne konstrukcije in pripravljena tehnična dokumentacija za jeklene nosilne elemente.

• Language: Slovenian
• Keywords: odmevnica, alfa komora, avtomobilska industrija, koeficient zvočne absorpcije, odmevni čas, lastne oblike, nosilne konstrukcije, analiza distribucije lastnih frekvenc, analiza frekvenčnega odziva, standardizacija
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-94842
• Publication date in RUL: 08.09.2017

Secondary language

• Language: English
• Title: Design of Reverberation Chamber

Abstract

Within this assignment, an alpha chamber was developed to be placed in the Laboratory of Working Machines and Technical Acoustics at the Faculty of Mechanical Engineering in Ljubljana. The alpha chamber will be used for sound absorption coefficient and small machines’ sound power measurements. Critical acoustic parameters, design guidelines and other objectives were identified and defined based on literature review and review of existing solutions. Simplified 3D models were used for finite element analysis of modal frequency distribution homogeneity in the inner volume of the chamber. Results of simulations represent the basis for the determination of the optimal sound field within the geometry of the chamber. Based on numerical analysis of load-carrying structure frequency response to sound signal excitation, optimal material and dimensions of load-carrying structure elements were determined. A detailed 3D model of load-carrying structure was constructed and technical documentation for steel load-carrying elements was prepared.

• Keywords: reverberation chamber, alpha chamber, automotive industry, sound absorption coefficient, reverberation time, mode shapes, load-carrying structures, modal frequency distribution analysis, frequency response analysis, standardization