Umeå universitets logga

umu.sePublikationer
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
A computationally efficient hybrid 2D–3D subwoofer model
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap. (Design Optimization Group)ORCID-id: 0000-0002-3800-6438
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.ORCID-id: 0000-0003-0473-3263
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap. The Forestry Research Institute of Sweden (Skogforsk), Uppsala Science Park, Uppsala, Sweden.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.
2021 (Engelska)Ingår i: Scientific Reports, E-ISSN 2045-2322, Vol. 11, artikel-id 255Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A subwoofer generates the lowest frequency range in loudspeaker systems. Subwoofers are used in audio systems for live concerts, movie theatres, home theatres, gaming consoles, cars, etc. During the last decades, numerical simulations have emerged as a cost- and time-efficient complement to traditional experiments in the design process of different products. The aim of this study is to reduce the computational time of simulating the average response for a given subwoofer design. To this end, we propose a hybrid 2D–3D model that reduces the computational time significantly compared to a full 3D model. The hybrid model describes the interaction between different subwoofer components as interacting modules whose acoustic properties can partly be pre-computed. This allows us to efficiently compute the performance of different subwoofer design layouts. The results of the hybrid model are validated against both a lumped element model and a full 3D model over a frequency band of interest. The hybrid model is found to be both accurate and computationally efficient.

Ort, förlag, år, upplaga, sidor
Nature Publishing Group, 2021. Vol. 11, artikel-id 255
Nyckelord [en]
Acoustics, Applied Mathematics, Computational Science
Nationell ämneskategori
Beräkningsmatematik
Identifikatorer
URN: urn:nbn:se:umu:diva-178326DOI: 10.1038/s41598-020-80092-9ISI: 000634380400001Scopus ID: 2-s2.0-85098947980OAI: oai:DiVA.org:umu-178326DiVA, id: diva2:1515491
Forskningsfinansiär
eSSENCE - An eScience CollaborationSwedish National Infrastructure for Computing (SNIC)Tillgänglig från: 2021-01-09 Skapad: 2021-01-09 Senast uppdaterad: 2023-09-05Bibliografiskt granskad
Ingår i avhandling
1. Material distribution-based topology optimization for wave propagation problems
Öppna denna publikation i ny flik eller fönster >>Material distribution-based topology optimization for wave propagation problems
2022 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Materialdistributionsbaserad topologioptimering för vågutbredningsproblem
Abstract [en]

This thesis employs material distribution-based topology optimization for wave propagation problems. In the material distribution approach, we define a material indicator function that models the presence and absence of material in a design domain. By placing material inside the design domain, the aim is to design a device that maximizes the output power or transmission of the system. The time-harmonic linear wave propagation problem is modeled using the Helmholtz equation. The governing equation is solved using the finite element method, and an artificial boundary condition is used to truncate the domain. Moreover, a gradient-based algorithm, the method of moving asymptotes by Svanberg, is used to solve the optimization problem. An adjoint method efficiently computes the gradients of the objective function with respect to design variables. 

This thesis considers two types of wave propagation problems: acoustic (Papers I-III) and electromagnetic wave propagation (Papers IV-V). In Papers I-II, we consider a bandpass design of a subwoofer. The aim of Paper I is to reduce the computational time required to evaluate the performance of a given subwoofer layout. To accomplish this, we develop a computationally efficient hybrid 2D-3D model. A full 3D model, as well as a lumped model, validate the hybrid model's results. Paper II focuses on optimizing the topology of a subwoofer using the computationally efficient hybrid model from Paper I for single as well multiple frequencies. In Paper III, we design a highly efficient uni-directional linear acoustic waveguide. Moreover, we also challenge the use of the term acoustic diode for such uni-directional linear acoustic waveguides in literature. Paper IV deals with the design of a microwave frequency dividing multiplexer, which splits the incoming signals into two frequency bands and delivers them to their respective output ports. In Paper V, we use the adjoint method to perform the sensitivity analysis of a coupled plasmonic problem where a Helmholtz equation is coupled to the Poisson equation. We validate the sensitivities computed using the adjoint method with the finite difference approach.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2022. s. 36
Serie
Report / UMINF, ISSN 0348-0542 ; 22.05
Nyckelord
topology optimization, material distribution, wave propagation problems, Helmholtz equation, acoustics, electromagnetics, plasmonics
Nationell ämneskategori
Beräkningsmatematik
Identifikatorer
urn:nbn:se:umu:diva-193444 (URN)978-91-7855-749-3 (ISBN)978-91-7855-750-9 (ISBN)
Disputation
2022-04-28, NAT.D.320, Umeå University, Umeå, 13:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2022-04-07 Skapad: 2022-04-01 Senast uppdaterad: 2022-04-04Bibliografiskt granskad

Open Access i DiVA

fulltext(1621 kB)345 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1621 kBChecksumma SHA-512
c5715e7abde963c8c8f9058b80ffb427bd98e0a2aeebe24d0955a93b8040da3c842cfec42542df414c33153f8ebd1f6a564358cb60b0dade6e92690830a73ce3
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextScopus

Person

Bokhari, Ahmad HasnainBerggren, MartinNoreland, DanielWadbro, Eddie

Sök vidare i DiVA

Av författaren/redaktören
Bokhari, Ahmad HasnainBerggren, MartinNoreland, DanielWadbro, Eddie
Av organisationen
Institutionen för datavetenskap
I samma tidskrift
Scientific Reports
Beräkningsmatematik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 345 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 347 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf