Mechanik und Mechatronik
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TECHNICAL ACOUSTICS GROUP

The Research Unit of Technical Acoustics Technology focuses both in teaching and research on the modelling, numerical simulation and optimisation of complex mechatronic systems (finite elements for multiphysics), sound design and noise reduction (vibro- and aeroacoustics), measurement technology (sound and vibration) and material parameter identification (structural mechanics, acoustics and electromagnetics).

MODELLING & SIMULATION

The basis for the analysis and design of complex mechatronic systems is a simulation tool capable of precisely computing the interaction of the different physical fields (structural mechanics,  acoustics, electromagnetics, heat transfer).Therefore, it is able to perform virtual prototyping. Since many years, we have developed and further improved our simulation environment CFS++ (Coupled Field Simulation), which solves the describing partial differential equations including their couplings based on the Finite Element (FE) method. Due to advanced material models, nonconforming grid techniques, higher order finite elements, and highly efficient coupling strategies, performance and capability of CFS++ are far beyond commercial tools. In addition, the tool automatically performs shape and topology optimisation using an advanced version of the SIMP (Solid Isotropic Material with Penalisation) method.

MEASUREMENT TECHNOLOGY

The group  is well equipped with high-end measurement devices in the field of sound and vibration analysis (fibre optic differential and laser scanning vibrometer, laser speckle interferometer, digital image correlation, acoustic microphone array, acoustic impedance and transmission measurement system, particle velocity sound probes, 3D magnetic field and coordinate measurement system, etc.). Furthermore, we have an electronic lab for the design and fabrication of electronic circuits and a high-end machinery shop for the fabrication of prototypes.

SELECTED RESEARCH PROJECTS

  • MEMS (Micro-Electro-Mechanical-Systems) loud-  speaker with digital sound reconstruction
  • Identification of noise sources in the automotive industry by correlated beamforming
  • Aeroacoustic noise reduction in HVAC systems
  • Piezoelectric surface acoustic wave sensors
  • Signal processing for condition monitoring the reliability of magnetically pre-tensioned chokes.

Selected Publications

A. Hüppe, J. Grabinger, M. Kaltenbacher, A. Reppenhagen, W. Kühnel
A Non-Conforming Finite Element Method for Computational Aeroacoustics in Rotating Systems, AIAA Aeroacoustics, 2014

M. Kaltenbacher, A. Volk, M. Ertl
Anisotropic model for the numerical computation of magnetostriction in grain-oriented electrical steel sheets, COMPEL, 2013

F. Wein, M. Kaltenbacher, M. Stingl
Topology optimization of a cantilevered piezoelectric energy harvester using stress norm constraints, Structural and Multidisciplinary Optimization, 2013