Change search
ReferencesLink to record
Permanent link

Direct link
Pass-by noise contribution analysis of electric vehicles
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In the modern urban lifestyle, more and more people are exposed to noise pollution in form of traffic noise. As a response to this, the automotive OEMs (Original Equipment Manufacturer) are put under pressure to reduce the emitted noise from vehicles. To be able to meet the upcoming, stricter regulations, the automotive OEMs seeks new techniques to be able to front load the pass-by noise engineering in the vehicle development process and to identify and understand the different sources that contributes to the exterior noise.Earlier exterior sources ranking using ASQ (Airborn Source Quantification) with an energetic approach during pass-by noise test has yielded very good and reliable results for an ICE (Internal Combustion Engine) vehicle.In this Master Thesis, two exterior source ranking methods have been tested and evaluated for an electric vehicle during in-room pass-by noise test. The two methods were: ASQ and OPA (Operational Path Analysis). In total, five models were built from the two methods and each model was evaluated for, in total, three driving conditions corresponding to the current ISO362-1:2007 and the proposed, revised version.The results show that the ASQ models are not capable to correctly estimate the engine contribution due to its high tonality. Moreover, it was seen that the energetic ASQ model is very sensitive to small changes. Both ASQ models underestimated the tire noise.The OPA model on the other hand managed to estimate the total contribution very well. Both the engine contribution and the tire contributions are well estimated. Nevertheless, OPA as method has several weaknesses and building an OPA model is not a straightforward task. Its weaknesses and the process to reach a final OPA model are discussed in this thesis.It was seen that one of the most crucial steps in an OPA model is to have clean references to get meaningful results. A MIMO-FIR filter was therefore used to filter out engine harmonics from the tire references. Its principles and importance for the end results are also discussed.Included is also an overview of the basic principles in TPA (Transfer Path Analysis), ASQ, OPA and in room pass by noise test as well as a description of the test campaign.

Place, publisher, year, edition, pages
2014. , 135 p.
TRITA-AVE, ISSN 1651-7660 ; 2014:02
Keyword [en]
Transfer Path Analysis (TPA), Airborn Source Quantification (ASQ), Operational Path Analysis (OPA), Time domain, In-room Pass-By Noise test, MIMO FIR-filter
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-159271OAI: diva2:784003
Available from: 2015-01-28 Created: 2015-01-28 Last updated: 2015-01-28Bibliographically approved

Open Access in DiVA

fulltext(3727 kB)443 downloads
File information
File name FULLTEXT01.pdfFile size 3727 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Marcus Wallenberg Laboratory MWL
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 443 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 100 hits
ReferencesLink to record
Permanent link

Direct link