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Applicability of ISO standards & noise estimation tool
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This study has two major purposes: (1) To determine the applicability of ISO standards for calculating sound power levels emitted by acoustic noise sources in-house at Ericsson, Kista. (2) To design a software tool for estimation of emitted sound power levels from a radio installation.

To determine the applicability of different ISO standards during the design phase at Ericsson, viable standards were chosen and measurements were taken on the exact same noise source following each chosen standard. The evaluation of these measurements was made with different points in focus.

  •  Accuracy
  •  Availability of instrumentation and measurement environments
  •  Time consumption
  •  Complexity of measurement conduction.

The ISO standard that showed most promise was the ISO 3744. This standard uses a method with fairly high accuracy and is quite easy to implement compared to other standards tested. All instrumentation required to follow this standard, except for a calibrated microphone calibrator, is available at Ericsson, Kista. The standards ISO 3747 and ISO 9614-2 might also be of interest, during the design phase, if the equipment necessary is acquired.

The acoustic noise estimation tool was written in the Microsoft Excel embedded programming language, Visual Basic for Application version 7.1. With the tool it is possible to specify the layout of a radio installation for mobile traffic with different mounted radios and estimate both the sound power level emitted from all these radio units and the sound pressure level at a distance from the radio installation. It is also possible to define new radio units in the tool and save them for later use.

The tool was verified by acoustic measurements taken on a test setup at MWL, KTH.

Abstract [sv]

Denna studie har två huvudsyften: (1) Att bestämma tillämpligheten av ISO-standarder för beräkning av ljudeffektnivåer som avges av bullerkällor internt på Ericsson, Kista. (2) Att utforma ett mjukvaruverktyg för uppskattning av utsända ljudeffektnivåer från en radioinstallation.

För att bestämma tillämpligheten av olika ISO-standarder under designfasen på Ericsson, valdes genomförbara standarder ut och mätningar gjordes på en och samma bullerkälla enligt varje separat standard. Utvärderingen av dessa mätningar gjordes med olika punkter i fokus.

• Noggrannhet

• Tillgång till utrustning och mätmiljöer

• Tidsåtgång

• Mätmetodens komplexitet

Den ISO-standard som visade sig mest lovande var ISO 3744. Denna standard använder en metod med relativt hög noggrannhet och är ganska lätt att genomföra jämfört med andra standarder som testats.

Alla instrument som krävs för att följa denna standard, med undantag för en kalibrerad mikrofon kalibrator, finns på Ericsson, Kista. Standarderna ISO 3747 och ISO 9614-2 kan också vara av intresse om den utrustning som behövs, för att följa standarderna införskaffas.

Place, publisher, year, edition, pages
2016. , 68 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:85
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-203817OAI: oai:DiVA.org:kth-203817DiVA: diva2:1082708
External cooperation
Ericsson AB
Examiners
Available from: 2017-03-17 Created: 2017-03-17 Last updated: 2017-03-17Bibliographically approved

Open Access in DiVA

fulltext(2780 kB)46 downloads
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77dd58bf4b7f208f2ac46546a4a8760e0116f142115d5ae9c4a4704e764f4fdbf22964820f0dfa1c3ccdac5f290ee58bf39c43abaf64c23d6fe469299a060503
Type fulltextMimetype application/pdf

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