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3D modeliranje in tisk ohišja za zvočnik
ID Kapus, Jernej (Avtor), ID Muck, Deja (Mentor) Več o mentorju... Povezava se odpre v novem oknu

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Izvleček
Cilj diplomskega dela je bil izdelati funkcionalno 3D natisnjeno ohišje za zvočnik in ugotoviti, kako na njegove akustične lastnosti vpliva uporaba različnih materialov. V ta namen smo izdelali tri enako oblikovana ohišja iz treh različnih termoplastov in izmerili njihove frekvenčne odzive ter harmonična popačenja. Kot teoretično osnovo smo predstavili 3D-tisk s poudarkom na opisu tehnologije, ki deluje na osnovi ekstrudiranja materialov oziroma termoplastov. Isto tehnologijo smo uporabili tudi za tisk ohišij. Temu sledi kratka predstavitev 3D-modeliranja, predstavitev elektrodinamičnih zvočnikov in ohišij za zvočnike. Ob pripravi slednjih smo ugotovili, da imajo najboljše akustične lastnosti okrogla ohišja, kar smo kasneje tudi upoštevali pri oblikovanju. Nazadnje smo ob pregledu raziskav predstavili in opisali zanimive zvočnike s 3D natisnjenimi ohišji. V eksperimentalnem delu smo opisali postopek načrtovanja in modeliranja eliptičnega ohišja ter tisk ohišja s tremi različnimi termoplastičnimi materiali oziroma filamenti, in sicer na osnovi ABS, PLA in kompozitnega filamenta PLA z dodatkom lesnih vlaken. Pri tem smo uporabili dva namizna tiskalnika – CubePro Duo in Witbox. Za tisk vseh treh ohišij smo uporabili enake nastavitve. Najboljši rezultat tiska smo dosegli s filamentom PLA na tiskalniku CubePro Duo, največ napak pa je nastalo pri tisku lesnega filamenta na tiskalniku Witbox. V ohišja smo s pomočjo lesenega obroča začasno vgradili 4-inčni širokopasovni zvočnik, kar nam je omogočilo merjenje akustičnih lastnosti posameznih ohišij. Meritve smo izvedli s pomočjo profesionalne opreme v gluhi sobi Fakultete za elektrotehniko v Ljubljani. Pri tem smo ugotovili, da frekvenčni odziv od idealnega odstopa za približno +/− 5 dB in da so harmonska popačenja pod mejo zaznave. Z vidika akustike med posameznimi ohišji nismo izmerili relevantnih razlik.

Jezik:Slovenski jezik
Ključne besede:3D-tisk, 3D-modeliranje, zvočnik, ohišje za zvočnik, frekvenčni odziv, harmonična popačenja.
Vrsta gradiva:Diplomsko delo/naloga (mb11)
Organizacija:NTF - Naravoslovnotehniška fakulteta
Leto izida:2017
Datum objave v RUL:20.09.2017
Število ogledov:870
Število prenosov:403
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Sekundarni jezik

Jezik:Angleški jezik
Naslov:3D modeling and printing of speaker enclosure
Izvleček:
The goal of this thesis was to create a functional 3D printed speaker enclosure and to determine how its acoustic properties are affected by the use of different materials. For this purpose three identically shaped enclosures from three different thermoplastics were created and their frequency responses and harmonic distortions weremeasured. In theoretical part, 3D printing is presented with special emphasis on describing the technologies based on material extrusion, namely the extrusion of thermoplastics, which we have used to print the enclosures. This is followed by a brief presentation of 3D-modeling and presentations of electrodynamic loudspeakers and speaker enclosures. When preparing the latter we have discovered that spherical enclosures have the best acoustic properties, which we have taken into account when creating the design. While examining the state of present research, we have presented and described interesting speakers with 3D printed enclosures. The experimental part contains a description of the design and modeling processes of an elyptical enclosure as well as printing of the enclosure with three different thermoplastic materials or filamentsbased on ABS, PLA, and a composite filament of PLA and wood fibres. Two desktop printers were used, namely CubePro Duo and Witbox. Same settings for all three prints were used. The best results were achieved when printing with PLA filament on CubePro Duo whilethosewith wood filament on Witbox were the worst. The speaker was first fixed onto a wooden ring and this assembly was then temporarily attached to each enclosure to study its acoustic properties. The measurementswere conducted in an anechoic chamber of the Faculty of Electrical Engineering in Ljubljana using professional equipment. Our frequency responses differedby approximately ±5 dB from those stated by manufacturer. Harmonic distortions were below the level of perception. No relevant acoustic differences between the three enclosures were found.

Ključne besede:3D printing, 3D-modeling, loudspeaker, speaker enclosure, frequency response, harmonic distortion.

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