Dipl.-Ing. Marcus Mäder

Research Associate

Source identification in the field of aero-acoustics

Since the 50's of the last century, the research field of flow acoustics has been accompanied by a steadily growing interest in the engineering discipline. Starting with the works of Lighthill, Curle, Ffowcs Williams and Hawkings and continuing with Lilley, Goldstein and Ewert, a large number of so-called acoustic analogies were created to compute the sound radiation of flow immersed bodies.

In addition to the widely used Linearized Euler Equations (LEE), the Acoustic Perturbation Equations (APE) and the Linearized Navier-Stokes Equations (LNSE), Galbrun's formulation, which has been less common up to now, is also known. This formulation, published in 1932, describes the acoustic field in a flow using a mixed Euler-Lagrangian approach. In addition to the mathematically more complex description, Galbrun's formulation offers interesting advantages with respect to conventional approaches.

The existing theories are extended and possible source terms are identified, which are then compared with already establish formulations. As a result of the novel mathematical formulations, source identification can be seen as a contribution to the physical understanding of flow acoustics and its nature.

Research Topics:

  • Numerical & experimental mechanics
  • Room acoustics
  • System identification & optimization
  • Aero acoustics

Lectures

Winter term 2018/19

TitleCourse no.DatesDurationTypeLecturer (assistant)
Sound Radiation0000000743Link4PR

Summer term 2019

TitleCourse no.DatesDurationTypeLecturer (assistant)
Sound Radiation0000003742Link4PR

Publications

2017

  • Gatt, M.; Guettler, M.; Marburg, S.: Objektive Psychoakustik. Natürliche psychoakustische Empfindung im Spiegel wissenschaftlicher Systematik. Fortschritte der Akustik - DAGA 2017 : 43. Jahrestagung für Akustik, 06. bis 09. März 2017 in Kiel, DEGA e.V., 2017 more… BibTeX
  • Guettler, M.; Marburg, S.: Randbedingungen der Galbrun-Gleichung in komplexen Strömungen. Fortschritte der Akustik - DAGA 2017 : 43. Jahrestagung für Akustik, 06. bis 09. März 2017 in Kiel, DEGA e.V., 2017 more… BibTeX

2016

  • Guettler, M.; Gatt, M.; Marburg, S.: Vergleich unterschiedlicher Quellformulierungen in der Strömungsakustik. Fortschritte der Akustik- DAGA 2016 : 42. Jahrestagung für Akustik, 14. bis 17. März 2016 in Aachen, DEGA e.V, 2016 more… BibTeX
  • Guettler, M.; Gatt, M.; Marburg, S.: Experimental Modal Analysis of fruit: A starting point of objectively characterizing the degree of ripeness. Proceedings of the 45th International Congress and Expositionon Noise Control Engineering, 201645th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016; Hamburg; Germany; more… BibTeX
  • Guettler, M.; Marburg, S.: Der Klang der Frucht: Zwischen intuitivem Hören und wissenschaftlichen Untersuchungen. Fortschritte der Akustik- DAGA 2016 : 42. Jahrestagung für Akustik, 14. bis 17. März 2016 in Aachen, DEGA e.V, 2016 more… BibTeX
  • Guettler, M.; Marburg, S.: Comparing different aero-acoustic formulations in terms of results of an eigenvalue problem. Proceedings of the 45th International Congress and Expositionon Noise Control Engineering, 201645th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016; Hamburg; Germany; more… BibTeX
  • Stache, Martin; Guettler, Marcus; Marburg, Steffen: A precise non-destructive damage identification technique of long and slender structures based on modal data. Journal of Sound and Vibration 365, 2016, 89--101 more… BibTeX Full text ( DOI )
  • Stache, Martin; Guettler, Marcus; Marburg, Steffen: A precise non-destructive damage identification technique of long and slender structures based on modal data. Journal of Sound and Vibration 365, 2016, 89-101 more… BibTeX Full text ( DOI )

2014

  • Guettler, M.; Marburg, S.: The nonlinear inhomogeneous Galbrun-Equation: Derivation and possible Ways to solve numerically. , Institute of Noise Control Engineering, 2014 more… BibTeX
  • Guettler, Marcus; Marburg, Steffen: Die inhomogene Galbrun-Gleichung: Herleitung und Ansätze zur numerischen Lösung. , 2014 more… BibTeX
  • Khosroshahi, Saati; F., Sepahvand; K., Guettler; M., Pourtahmasi; K.; Marburg, S.: Modal analysis of the Persian music instrument Kamancheh: finite element modeling and experimental investigation. , Proceedings of the International Symposium on Musical Acoustics (ISMA), Le Mans, France, 2014 more… BibTeX
  • Stache, M.; Guettler, M.; Marburg, S.: Research on eigenfrequency shifts due to cracks in cylindrical structures and the application in non-destructive t esting. , 2014 more… BibTeX