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Finnveden, S., Birgersson, F., Ross, U. & Kremer, T. (2005). A model of wall pressure correlation for prediction of turbulence-induced vibration. Journal of Fluids and Structures, 20(8), 1127-1143
Open this publication in new window or tab >>A model of wall pressure correlation for prediction of turbulence-induced vibration
2005 (English)In: Journal of Fluids and Structures, ISSN 0889-9746, E-ISSN 1095-8622, Vol. 20, no 8, p. 1127-1143Article in journal (Refereed) Published
Abstract [en]

The vibration response of a structure excited by a turbulent boundary layer is investigated experimentally and numerically. First, the wall pressure in a high speed acoustic wind tunnel is characterized and the cross-spectral density is approximated using a Corcos model with frequency dependent correlation lengths and a modified Chase model. Both models agree quite well with the measured cross spectrum. Second, based on these turbulence models, the vibration response is predicted and compared to measurements. At lower frequencies both models perform well. In a higher frequency region, however, the vibration response is greatest for length scales that are much longer than the one given by the convection velocity of the turbulence, and in this frequency region only the modified Chase model works effectively.

Keywords
turbulence, wall pressure, correlation, chase, random vibration, finite-element-method, boundary-layer pressures, spectral super element, frequency spectrum, plate vibration, general-theory, part 1, fluctuations, field, beneath
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-15026 (URN)10.1016/j.jfluidstructs.2005.05.012 (DOI)000231741100008 ()2-s2.0-23844518955 (Scopus ID)
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
Wallin, H. P., Carlsson, U., Ross, U. & El Gaidi, K. (2005). Learning MATLAB: Evaluation of methods and materials for first-year engineering students. International journal of engineering education, 21(4), 692-701
Open this publication in new window or tab >>Learning MATLAB: Evaluation of methods and materials for first-year engineering students
2005 (English)In: International journal of engineering education, ISSN 0949-149X, Vol. 21, no 4, p. 692-701Article in journal (Refereed) Published
Abstract [en]

The paper describes the development of a MATLAB course as part of a first-year introductory engineering course 'Perspectives of Vehicle Engineering' in the MSc programme in Vehicle Engineering at the Royal Institute of Technology (KTH) in Stockholm, Sweden. This course is intended to give core engineering knowledge and experience, and to prepare the students for their studies in engineering mechanics and vehicle engineering. The expectation is that the students, upon completion of the MATLAB course, will have acquired the ability to use MATLAB in later courses in the curriculum where MATLAB is chosen to be the primary computational and visualisation tool. The development work was divided into three parts. The first part contained a preparatory phase in which the work was planned, the purpose and objectives formulated, the course content and implementation planned, and suitable instructional materials identified. The next step was to select a student test group to go through a trial run of the course, using the different options available for instructional materials. The experiences obtained from the test group's efforts, and their results, were the basis for carrying out the first year of regular instruction of the MATLAB course. In the third and final phase of the course development, it was given for the first time as an ordinary part of the curriculum for first-year students in the KTH vehicle engineering program. The results and experiences obtained from that 1st year will serve as a basis for modifications to the MATLAB course to be given in later years.

Identifiers
urn:nbn:se:kth:diva-15055 (URN)000232008100018 ()2-s2.0-24944461470 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1143-4643

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