GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Sound radiation from a double-leaf elastic plate with a point force excitation: effect of an interior panel on the structure-borne sound radiation
    Elsevier BV ; 2002
    In:  Applied Acoustics Vol. 63, No. 7 ( 2002-07), p. 737-757
    Details
    In: Applied Acoustics, Elsevier BV, Vol. 63, No. 7 ( 2002-07), p. 737-757
    Type of Medium: Online Resource
    ISSN: 0003-682X
    URL: Article
    DOI: 10.1016/S0003-682X(01)00075-5
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2002
    detail.hit.zdb_id: 1501311-X
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Experimental identification of force radiation modes
    Institute of Noise Control Engineering (INCE) ; 2013
    In:  Noise Control Engineering Journal Vol. 61, No. 1 ( 2013-01-01), p. 81-86
    Details
    In: Noise Control Engineering Journal, Institute of Noise Control Engineering (INCE), Vol. 61, No. 1 ( 2013-01-01), p. 81-86
    Type of Medium: Online Resource
    ISSN: 0736-2501
    URL: Article
    DOI: 10.3397/1/1.3761008
    Language: English
    Publisher: Institute of Noise Control Engineering (INCE)
    Publication Date: 2013
    detail.hit.zdb_id: 2631757-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Experimental comparison of absorption characteristics of single-leaf permeable membrane absorbers with different backing air cavity designs
    Institute of Noise Control Engineering (INCE) ; 2020
    In:  Noise Control Engineering Journal Vol. 68, No. 3 ( 2020-05-20), p. 237-245
    Details
    In: Noise Control Engineering Journal, Institute of Noise Control Engineering (INCE), Vol. 68, No. 3 ( 2020-05-20), p. 237-245
    Abstract: Permeable membranes (PMs), which are air-permeable fabrics made from various natural or chemical fibers that are thinly woven or non-woven, are attractive sound-absorbing materials. The simplest PM absorber is a single-leaf PM absorber (PMSG) with a non-locally reacting rigid backed air cavity in which a PM is placed in front of a rigidly backed air cavity. A honeycomb-backed single-leaf PM absorber (PMHC), which has a locally reacting air cavity, is also well known. However, the two PM absorbers have shortcomings in their diffuse field absorption coefficients attrib- utable to the backing air cavity design. To overcome those shortcomings, we intro- duce a PM absorber array (PMAR): a single-leaf PM absorber with multiple locally reacting air cavities of different depths. As described herein, to present PMAR benefits, we experimentally compare the diffuse field absorption charac- teristics of the three single-leaf PM absorbers with different air cavity designs. Reverberation absorption coefficient measurements were taken using nine thin permeable membranes made of three chemical fibers, each having different flow resistance and surface density. Results show that PMAR is an effective sound ab- sorbing structure to overcome the shortcomings related to the diffuse field absorp- tion coefficients of PMSG and PMHC. Material property effects on permeable membranes are also demonstrated.
    Type of Medium: Online Resource
    ISSN: 0736-2501
    URL: Article
    DOI: 10.3397/1/376820
    Language: English
    Publisher: Institute of Noise Control Engineering (INCE)
    Publication Date: 2020
    detail.hit.zdb_id: 2631757-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    An experimental study of a cylindrical microperforated panel sond absorber with core
    Institute of Noise Control Engineering (INCE) ; 2013
    In:  Noise Control Engineering Journal Vol. 61, No. 6 ( 2013-11-01), p. 590-596
    Details
    In: Noise Control Engineering Journal, Institute of Noise Control Engineering (INCE), Vol. 61, No. 6 ( 2013-11-01), p. 590-596
    Type of Medium: Online Resource
    ISSN: 0736-2501
    URL: Article
    DOI: 10.3397/1/3761052
    Language: English
    Publisher: Institute of Noise Control Engineering (INCE)
    Publication Date: 2013
    detail.hit.zdb_id: 2631757-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Finite element modeling for predicting sound insulation of fixed windows in a laboratory environment
    Frontiers Media SA ; 2022
    In:  Frontiers in Built Environment Vol. 8 ( 2022-8-29)
    Details
    In: Frontiers in Built Environment, Frontiers Media SA, Vol. 8 ( 2022-8-29)
    Abstract: This paper presents discussion of the prediction capability of three numerical models using finite element method for predicting the sound reduction index (SRI) of fixed windows having different dimensions in a laboratory environment. The three numerical models tested here only discretize the window part or windows part and the space around the windows to reduce the necessary computational cost for vibroacoustics simulations. An ideal diffused sound incidence condition is assumed for three models. Their predictability and numerical efficiency were examined over five fixed windows with different dimensions compared to measured SRIs. First, the accuracy of the simplest model in which the window part is only discretized with finite elements was examined. Acoustic radiation to the transmission field is computed using Rayleigh’s integral. Calculations were performed under two loss factor setups respectively using internal loss factors of each material and measured total loss factor of each window. The results were then compared with the measured values. Results revealed the effectiveness of using the measured total loss factor at frequencies around and above the coincidence frequencies. Subsequently, we tested the prediction accuracy of a numerical model that includes a niche existing in a laboratory environment. Also, hemispherical free fields around the window are discretized using fluid elements and infinite fluid elements. The results underscored the importance of including a niche in a numerical model used to predict sound reduction index below 1 kHz for smaller windows accurately. Nevertheless, this numerical model, including a niche, entails high computational costs. To enhance the prediction efficiency, we examined the applicability of a weak-coupling model that divides calculation procedures into three steps: (1) incidence field calculation to the window surface, (2) sound transmission calculation in fixed windows, and (3) sound radiation calculation from a window surface to a transmission field. Results revealed that the weak-coupling model produces almost identical results to those of a strong-coupling model, but with higher efficiency.
    Type of Medium: Online Resource
    ISSN: 2297-3362
    URL: Article
    DOI: 10.3389/fbuil.2022.971459
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2835358-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Effect of a porous absorbing layer on absorption characteristics of a double-leaf MPP space sound absorber
    Terrapub ; 2015
    In:  MEMOIRS OF THE GRADUATE SCHOOLS OF ENGINEERING AND SYSTEM INFORMATICS KOBE UNIVERSITY ( 2015-04-08)
    Details
    In: MEMOIRS OF THE GRADUATE SCHOOLS OF ENGINEERING AND SYSTEM INFORMATICS KOBE UNIVERSITY, Terrapub, ( 2015-04-08)
    Type of Medium: Online Resource
    ISSN: 2185-5110
    URL: Article
    DOI: 10.5047/gseku.e.2014.005
    Language: Unknown
    Publisher: Terrapub
    Publication Date: 2015
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    A Parallel Dissipation-Free and Dispersion-Optimized Explicit Time-Domain FEM for Large-Scale Room Acoustics Simulation
    MDPI AG ; 2022
    In:  Buildings Vol. 12, No. 2 ( 2022-01-23), p. 105-
    Details
    In: Buildings, MDPI AG, Vol. 12, No. 2 ( 2022-01-23), p. 105-
    Abstract: Wave-based acoustics simulation methods such as finite element method (FEM) are reliable computer simulation tools for predicting acoustics in architectural spaces. Nevertheless, their application to practical room acoustics design is difficult because of their high computational costs. Therefore, we propose herein a parallel wave-based acoustics simulation method using dissipation-free and dispersion-optimized explicit time-domain FEM (TD-FEM) for simulating room acoustics at large-scale scenes. It can model sound absorbers with locally reacting frequency-dependent impedance boundary conditions (BCs). The method can use domain decomposition method (DDM)-based parallel computing to compute acoustics in large rooms at kilohertz frequencies. After validation studies of the proposed method via impedance tube and small cubic room problems including frequency-dependent impedance BCs of two porous type sound absorbers and a Helmholtz type sound absorber, the efficiency of the method against two implicit TD-FEMs was assessed. Faster computations and equivalent accuracy were achieved. Finally, acoustics simulation of an auditorium of 2271 m3 presenting a problem size of about 150,000,000 degrees of freedom demonstrated the practicality of the DDM-based parallel solver. Using 512 CPU cores on a parallel computer system, the proposed parallel solver can compute impulse responses with 3 s time length, including frequency components up to 3 kHz within 9000 s.
    Type of Medium: Online Resource
    ISSN: 2075-5309
    URL: Article
    DOI: 10.3390/buildings12020105
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2661539-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Advances in Room Acoustics of Non-Performing Public Spaces
    MDPI AG ; 2022
    In:  Applied Sciences Vol. 13, No. 1 ( 2022-12-23), p. 188-
    Details
    In: Applied Sciences, MDPI AG, Vol. 13, No. 1 ( 2022-12-23), p. 188-
    Abstract: Room acoustics is one of the most important areas of acoustics and is the study of acoustics in predominantly enclosed spaces such as rooms in the built environment [...]
    Type of Medium: Online Resource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app13010188
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2704225-X
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Application of Paper Folding Technique to Three-Dimensional Space Sound Absorber with Permeable Membrane: Case Studies of Trial Productions
    International Institute of Acoustics and Vibration (IIAV) ; 2020
    In:  The International Journal of Acoustics and Vibration Vol. 25, No. 2 ( 2020-6-30), p. 243-247
    Details
    In: The International Journal of Acoustics and Vibration, International Institute of Acoustics and Vibration (IIAV), Vol. 25, No. 2 ( 2020-6-30), p. 243-247
    Abstract: The authors propose a space sound absorber made of a permeable membrane (PM), including woven or non-woven fabrics in three-dimensional shapes, e.g., cylinder, rectangle, etc. The proposed absorbers are examined by experimental measurements and boundary element analyses, and it is found that they can be effectively used especially for middle and high frequencies. In order to develop these absorbers for wider applications, it would be desirable to give them additional values and functions, particularly to elaborate on their design. Supposing that they could also be used for lighting equipment, such as lampshades as one of the applications, pilot studies on pseudo-cylindrical, and pseudo-spherical PM space absorbers with uneven surfaces produced by paper-folding (origami technique) are carried out. The pseudo-cylindrical concave curves (PCCC) shell shape has been proven as a suitable form for a lampshade, and the pseudo-spherical concave curves (PSCC) shell shape is an application of PCCC. In this paper, PCCC and PSCC shell shapes are applied to three-dimensional PM space absorbers, and trials are conducted using PMs selected by flow resistance measurements and preliminary simulations. The sound absorptivity of the specimens is measured in a reverberation chamber, and their absorptivity is 0.6 (PCCC case) and 0.4 (PSCC case) at mid-high frequencies.
    Type of Medium: Online Resource
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.20855/ijav.2020.25.2
    DOI: 10.20855/ijav.2018
    DOI: 10.20855/ijav.2020.25.21657
    Language: Unknown
    Publisher: International Institute of Acoustics and Vibration (IIAV)
    Publication Date: 2020
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    How did the ‘state of emergency’ declaration in Japan due to the COVID-19 pandemic affect the acoustic environment in a rather quiet residential area?
    UCL Press ; 2020
    In:  UCL Open Environment Vol. 2 ( 2020)
    Details
    In: UCL Open Environment, UCL Press, Vol. 2 ( 2020)
    Abstract: The COVID-19 pandemic caused lockdowns in many countries worldwide. Acousticians have made surveys to monitor how cities became quieter under the lockdown, mainly in central areas in cities. However, there have been few studies on the changes in the acoustic environment due to the pandemic in the usually quieter residential areas. It may be expected to be different from the effect in ‘originally noisy’ areas. Also, the effect could be different in Japan, because the ‘state of emergency’ declaration there was different to lockdowns elsewhere. Considering these circumstances, this article reports the results of noise monitoring and makes some observations on the acoustic environment in residential areas far from city centres, to provide an example of how the acoustic environment was affected by the state of emergency declaration due to the COVID-19 pandemic in Japan. The results showed that the reduction of noise levels was somewhat less than that reported in large cities. Also, comparing the results after the cancellation of the state of emergency, the noise level increased again. However, observations of noise sources imply that a possible change in human behaviour may have also affected the acoustic environment.
    Type of Medium: Online Resource
    ISSN: 2632-0886
    URL: Article
    DOI: 10.14324/111.444/ucloe.000009
    Language: English
    Publisher: UCL Press
    Publication Date: 2020
    detail.hit.zdb_id: 3027845-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...