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Optimization of the radiation pattern of a studio loudspeaker
An important quality feature of studio loudspeakers (near-field monitor) is the spatial radiation pattern. CADFEM simulates the optimum.

Acoustic simulation with fluid-structure interaction (FSI)

Branch : Consumer goods/durable goodsSpecialist field: Structural mechanics, Acoustics

What influence do the cabinet walls have on the radiation pattern of the loudspeaker? CADFEM analyzed the acoustics of a studio loudspeaker with Ansys Mechanical and a defined fluid-structure interaction.

Summary

Task

An important quality feature of studio loudspeakers (near-field monitor) is the spatial radiation pattern. It should have as uniform a characteristic as possible. The interaction between the sound pressure waves and the loudspeaker cabinet is decisive.

Solution

Ansys Mechanical was used to analyse the radiation pattern of the studio loudspeaker. For this purpose, a fluid-structure interaction was defined between the cabinet and the surrounding air, with which the mutual influence can be reproduced realistically.

Customer benefits

The simulations led to a better understanding of the interaction between the housing and the surrounding air. On this basis, it was possible to efficiently optimize the radiation pattern of the studio loudspeaker without having to manufacture prototypes.

Project Details

Task

An important quality feature of studio loudspeakers (near-field monitor) is the spatial radiation pattern. This is perceived as particularly good if the loudspeakers have a characteristic that is as even as possible,  over the entire frequency range that is to be covered. To achieve this, not only the acoustic propagation in the air but also the interaction between the sound pressure waves and the loudspeaker cabinet must be taken into account. The aim of the simulation was to determine the influence of the (flexible) enclosure walls on the radiation behaviour of the loudspeakers.


Customer Benefit

The simulations led to a better understanding of the interaction between the housing and the surrounding air. On this basis, it was possible to efficiently optimize the radiation pattern of the studio loudspeaker without having to manufacture prototypes. Furthermore, compared to previous measurements with prototypes, a higher information content was achieved, since a "room-embracing" analysis of the sound propagation was possible and not only at single points, as was the case with microphones. As a result, a high product quality could be achieved in a short time and with manageable costs.


Solution

Ansys Mechanical was used to analyse the radiation pattern of the studio loudspeaker. For this purpose, a fluid-structure interaction was defined between the cabinet and the surrounding air, with which the mutual influence can be reproduced realistically. In order to reduce the model size, only the relevant area of the surrounding air was considered in the simulation. Nevertheless, due to the infinity boundary conditions used, the sound could propagate unhindered. Based on the principle of equivalent sound sources, the necessary evaluations could also be carried out outside the simulated model. The subdivision into several frequency ranges and the parameterization of the network and the surrounding air reduced the calculation times. A further acceleration could be achieved by the good parallelisation for HPC (High Performance Computing) applications.


Technical Manager Stuttgart

Products applied in the project