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Properties of vibration and sound transmission of plates with stop bands
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , viii, 37 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2014:74
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-158025OAI: oai:DiVA.org:kth-158025DiVA: diva2:773444
Presentation
2014-12-17, Hugin, Teknikringen 8, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20141219

Available from: 2014-12-19 Created: 2014-12-19 Last updated: 2015-06-02Bibliographically approved
List of papers
1. Reduction of the sound transmission of a periodic sandwich plate using the stop band concept
Open this publication in new window or tab >>Reduction of the sound transmission of a periodic sandwich plate using the stop band concept
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2015 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 128, 428-436 p.Article in journal (Refereed) Published
Abstract [en]

The sound transmission of a sandwich plate and its reduction using the stop band concept are investigated in this paper. A periodic sandwich plate consisting of a host plate and the attached structures is designed. The dispersion relation and the stop band of the periodic sandwich plate are studied first. The sound transmission of the periodic and bare sandwich plates is analysed and compared. The reduction from the stop band design (i.e., periodically adding stepped resonators) on the sound transmission of the sandwich plates is studied. The reasons for this reduction are analysed. In addition, the properties of the sandwich plate with different boundary conditions are also briefly studied. The numerical results indicate that the sound transmission is significantly reduced over the stop band of the periodic sandwich plate. The improvement can also exist in the frequency range outside the stop band.

Keyword
Reduction, Sandwich plate, Sound transmission, Stop band, Acoustic wave transmission, Architectural acoustics, Dispersions, Plates (structural components), Different boundary condition, Dispersion relations, Frequency ranges, Numerical results, Sandwich plates, Stop-bands, Periodic structures
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-167684 (URN)10.1016/j.compstruct.2015.02.053 (DOI)000354583300038 ()2-s2.0-84927602969 (Scopus ID)
Note

QC 20150602

Available from: 2015-06-02 Created: 2015-05-22 Last updated: 2017-12-04Bibliographically approved
2. Analysis and enhancement of flexural wave stop bands in 2D periodic plates
Open this publication in new window or tab >>Analysis and enhancement of flexural wave stop bands in 2D periodic plates
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2015 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 379, no 22-23Article in journal (Other academic) Published
Abstract [en]

The band structure and enhancement of flexural wave stop bands in a 2D periodic plate are investigated. A unified method for analysing and designing the stop band of the plates with various attached structures is proposed. The effect of attached structures is considered based on their equivalent parameters (added equivalent mass and equivalent moment of inertia). The influences of the equivalent parameters on the band structures are studied. Three cases are considered: adding pure equivalent mass, pure equivalent moment of inertia and the combination of these two. The stop bands are enhanced via the multi interaction between the host plate and the attached structure. The enhancement pattern is determined, and several ways to obtain a wider combined stop band are presented. The frequency response functions of corresponding finite periodic plates are calculated to verify the stop bands and their enhancement in a number of typical cases.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-158023 (URN)10.1016/j.physleta.2015.01.037 (DOI)000353613600010 ()2-s2.0-84925843246 (Scopus ID)
Note

Updated from manuscript to article in journal.

QC 20150521

Available from: 2014-12-19 Created: 2014-12-19 Last updated: 2017-12-05Bibliographically approved

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