Thesis Work - Simulation of complex sound radiation pattern from truck

MSc Thesis proposal at Volvo Group (30 ECTS credits, two students):

Simulation of complex sound radiation pattern from truck components using monopole clusters

The Master of Science Thesis work will be performed at KTH and at Volvo Group. The thesis work is initiated by Volvo Group Trucks Technology department, which is responsible for product development within the Volvo Group.

Noise is an important emission in the society today and one part of the work for a better environment is to lower the radiated noise from vehicles. This is done in several ways and one important part is to better understand the complexity in sound radiated patterns from vehicle components such as: ICE (Internal Combustion Engines), EDU (Electric Driving Units), compressors, fans and pumps.

For an ICE, the sound radiation can be measured in a semi-anechoic test cell at many microphone positions and in various operating conditions. The radiated sound pattern can also be described by using CAE vibro-acoustic simulations for the ICE surface as input data. Surface vibrations represent a large amount of data, several thousands of nodes, and are not practical to use as input when virtually installing the ICE on the truck. Instead, a common practice is to replace the surface vibrations by an equivalent cluster of monopoles placed close to the surface which is set as rigid. Monopoles are easily included as excitation sources in CAE acoustic models.

In this Master’s thesis, we wish to use CAE vibro-acoustic models in FEM SW Comsol to assess the following questions of interest:
  • Derive a relationship between the distribution of microphones in a noise test cell and the complexity of the radiation pattern that one can expect to capture.
  • If a component behaves as nth-order multipole, how should the monopole clusters be placed close to the surface, especially per face, in order to mimic this multipole behavior?
  • Compare the sound radiation pattern obtained from the vibration surface with the one obtained with monopole clusters and draw conclusions on the accuracy of the method for the far and near field.
The topics will first be addressed in a general sense, on a simplified vibro-acoustic shoe-box model and then on a real ICE model provided by GTT. The Master’s thesis will be performed at KTH with regular update meetings with the industry supervisors and is intended for two students.

Your profile:
  • MSc Student at a program in Acoustics
  • Knowledge in Finite Element Methods and FEM SW Comsol
Industry supervisors: Sophie Girolami, Frédéric Wullens at Volvo GTT
University supervisors: Romain Rumpler, Peter Göransson at KTH

Contact persons:
Sophie Girolami, Volvo Group, telephone: +46 31 3227367
Frédéric Wullens, Volvo Group, telephone: +46 73 4184081
Romain Rumpler, KTH, telephone: +46 73 4612497
Janos Turcsany, Volvo Group, telephone: +46 31 3234876

Application via:
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The Volvo Group drives prosperity through transport solutions, offering trucks, buses, construction equipment, power solutions for marine and industrial applications, financing and services that increase our customers’ uptime and productivity. Founded in 1927, the Volvo Group is committed to shaping the future landscape of sustainable transport and infrastructure solutions. Countless career opportunities are offered across the group’s leading brands and entities that share a culture of Trust, Passion, High Performance, Change and Customer Success. 

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