Conference_programme: 23: Structural acoustics and vibration
Lecture: Computer-aided sound estimation of industrial products for 3D virtual reality applications
Author(s): Münch Hannes, Dilba Boris, Backhaus Stefan-Georg, Becker Stefan
Summary:
The issue of product acoustics is getting more and more relevant as a quality criterion for customers. Furthermore, industrial companies have to ensure to comply with legal requirements concerning health and safety at employees' working places. Consequently, machine sounds are obviously of interest to both customers and developers. In the context of the publicly funded project called ‘’Acoustically Advanced Virtualisation of Products and Production Processes’’ (AVP³) the 3D virtual reality (VR) presentation of industrial products was investigated. As VR applications mostly focus on visual perception, a system with integrated 3D audio was developed. Based on methods like the wave field synthesis or binaural techniques the auralisation requires a certain set of data, which can be determined by measurements or simulations. Focusing on the example of an axial piston pump the approach of data determination by simulation has been carried out. In order to describe the mechanisms of sound generation and structure-borne sound propagation a structural dynamic finite element model representing the pump has been built up. As input an approximation of the pump excitation has been developed and applied to the model. Once the excitation points had been defined, frequency response functions (FRFs) were calculated characterizing the sensitivity of arbitrary evaluation points to vibration at the structural surface. As a result, the linear combination of FRFs and operating point specific loads lead to an estimation of the frequency response. To validate the approach's quality the acceleration at these evaluation points was measured by triaxial accelerometers and compared to simulation results for different operating conditions. Subsequently, the sound radiation in air was calculated based on the structural dynamics behaviour using the boundary element method. With a new set of FRFs for evaluation points in air the entire simulation workflow was finally compared to sound power measurements.
Corresponding author
Name: Mr Hannes Münch
e-mail: hannes.muench@boschrexroth.de
Country: Germany
