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Forum Acusticum 2026

8–12 Sept 2026
Europe/Vienna timezone

Session

A12.09 Hybrid Modelling Approaches for Efficient and Accurate Simulations

A12.09
9 Sept 2026, 10:20

Conveners

A12.09 Hybrid Modelling Approaches for Efficient and Accurate Simulations: S086

  • Albert Prinn (International Audio Laboratories Erlangen)
  • Jan Wouter Smits (University of Edinburgh)

Presentation materials

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  1. 4173. A Neural Network Approach to Spherical Wave Reflections in the Image Source Method (FA2026/897)
    Muyue Xi (International Audio Laboratories Erlangen)
    09/09/2026, 10:20
    A12 Numerical, Computational, and Theoretical Acoustics

    The standard image source method approximates surface reflections using plane wave reflection coefficients, which can introduce errors at low frequencies. The complex image source method addresses this issue by using reflection coefficients derived from the Sommerfeld integral solution for a point source above a sound-absorbing plane of infinite extent. However, this approach is more...

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  2. 4174. MIMO Room Impulse Response Analysis and Synthesis through a Modal-Domain Approach: Application to a Reverberation Chamber (FA2026/244)
    Giulia Fratoni (University of Bologna)
    09/09/2026, 10:40
    A12 Numerical, Computational, and Theoretical Acoustics

    A computational pipeline for modal analysis and synthesis of room impulse responses (RIRs) is presented, with application to a reverberation chamber. Modal frequencies and damping coefficients are estimated from measured RIRs using a sub-band least-squares complex frequency-domain (LSCF) algorithm. Synthesis is performed as a direct modal sum in the time domain. The method extends previous...

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  3. 4175. Towards a Hybrid Numerical Wave Method for Rooms with Extended Reaction Materials (FA2026/646)
    Albert Prinn (International Audio Laboratories Erlangen)
    09/09/2026, 11:00
    A12 Numerical, Computational, and Theoretical Acoustics

    Sound fields in rooms containing extended reaction materials can be predicted using numerical wave methods, such as finite difference or finite element methods. To describe the material's acoustic behaviour, an equivalent fluid model is often employed. This model typically includes complex-valued, frequency-dependent descriptions of the material's effective density and effective sound speed....

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  4. 4176. Secondary source method for polygonal scattering objects with cavities (FA2026/862)
    Peter Svensson
    09/09/2026, 11:20
    A12 Numerical, Computational, and Theoretical Acoustics

    A tube ending in an infinite baffle is a classical radiation problem and has been studied extensively, with closed-form or semi-analytical results for radiation impedance, directivity, and end correction. In contrast, an unflanged tube introduces additional physics, such as edge diffraction, making analytical treatment more challenging. This problem is highly relevant for simulating musical...

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  5. 4177. JAX-BEM: Gradient-Based Acoustic Shape Optimisation via a Differentiable Boundary Element Method (FA2026/191)
    James Hipperson (Acoustics Research Centre)
    09/09/2026, 11:40
    A12 Numerical, Computational, and Theoretical Acoustics

    Engineering structures are increasingly designed using numerical optimisation. However, traditional optimisation methods can be challenging with multiple objectives and many parameters. In machine learning, stable training of artificial neural networks with millions or billions of parameters is achieved using automatic differentiation frameworks such as JAX and Pytorch. Because these...

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