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Undersökning av akustiskaegenskaper hos ett insugningssystem
KTH, School of Engineering Sciences (SCI).
KTH, School of Engineering Sciences (SCI).
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Analysis of acoustic properties of an intake system (English)
Abstract [sv]

En viktig del i arbetet med att konstruera tysta fordon är kännedomen om komponenternas akustiska egenskaper. I projektet har ett insugningssystem till en lastbil från Scania undersökts, och utstrålad ljudintensitet och ljudeffekt för olika delytor på systemet uppmätts. Syftet var att bestämma utstrålad ljudeffekt och ljudintensitet för systemets olika delytor vid de olika fallen:

1. Tyst öde vid olika hastigheter

2. Flöde + ljud in i systemet

3. Enbart ljud in i systemet

Mätningarna skedde i enlighet med standaren ISO 9614-2 [1], där systemet scannades med ljudintensitetsprob. Insugningssystemet placerades i MWLs ekofria rum på KTH och kopplades till ett efterklangsrum så att luft kunde öda genom systemet. En högtalare placerades även i efterklangsrummet för att generera ljudet in i systemet.

Resultaten visade att de största delarna på systemet var de som utstrålade mest ljudeffekt. Inloppet på systemet utmärkte sig genom att utstråla mest ljudintensitet. Noterbart var även att ljudet från högtalaren inte påverkade resultatet nämnvärt i fallen med öde och högtalare, utan tycktes maskeras närmast totalt av luftströmningen inne i systemet.

Abstract [en]

An important part in designing quiet vehicles is the knowledge of the acoustic properties of components in the system. In this project, an intake system for a truck from Scania has been investigated, and radiated sound intensity and sound effect for different surface areas of the system are measured. The purpose was to determine the radiated sound effect and sound intensity of the system for these different cases:

1. Quiet ow at different speeds

2. Flow + noise

3. Only noise

The measurements were made in accordance with ISO 9614-2 [1], where the system was scanned with a sound intensity probe. The intake system was placed in MWL's eco-free room at KTH and the air exhausted into a reverberation room. A loudspeaker was also placed in the reverberation room to generate the sound into the system.

 

The results showed that the largest parts of the system were also the parts that radiated the most sound power. The inlet on the system was characterized by radiating the most sound intensity. It was also noticeable that the sound from the speaker did not signiffcantly affect the result in the cases with ow and noise, but appeared to be masked almost entirely by the airow inside the system.

Place, publisher, year, edition, pages
2018. , p. 33
Series
TRITA-SCI-GRU ; 2018-208
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-231020OAI: oai:DiVA.org:kth-231020DiVA, id: diva2:1221481
Supervisors
Examiners
Available from: 2018-06-20 Created: 2018-06-20 Last updated: 2018-06-20Bibliographically approved

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