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Antoine Bouilloux-Lafont & rubén noya pozo
DEVELOPMENT OF ACOUSTIC SIMULATIONS USING PARAMETRIC CAD MODELS IN COMSOL
Title and Content
• Purpose and Goals
• Methodology Flowchart
• Acoustics introduction
• Decomposition Architecture
• Local Optimisation
• Global Optimisation
• Future work
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AGENDA
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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purpose and goals
• Develop a method for automated acoustic simulations in COMSOL
• Evaluate performance of an EATS in terms of acoustics
• Simplify the method currently proposed
• Optimise parameters based on acoustic results
• Documentation of the new method
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title and Content
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methodology flow chart
Thesis Work Documentation
Data Collection
Former WorkPrevious Theses
InterviewsNXDE and NXPS
Literature StudyTheoretical Background
Method Development
Concluding Work
Method FinalisationMethod Validation
DocumentationGuidelines
Case StudyEATS
Risk AnalysisLikelihood, Consequence and Planned action
Model Generation
Parametric CAD
Model Simulation
Acoustics
Model Evaluation
Design Validation
Method Formulation
Model Preparation
Pre-CAD process
10th of May 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo / Master thesis / Half-time Presentation
Title and Content
• Performance of silencers evaluated measuring the transmission loss (TL)
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Acoustics Introduction
Transmission Loss schematicTwo-port schematic of a silencer
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title and Content
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decomposition architecture
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title and Content
• Two major scripts:
− Modify and save the geometry in CATIA V5
− Run acoustic simulation in COMSOL Multiphysics for newly created model
• Other scripts:
− Coordinates for substrates (transfer matrix)
− Capture of model geometry and TL plot for each iteration
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EXCEL – Connecting software
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title and Content
• Fully parametrised geometry based on input parameters
• Acoustic model
• Surface denomination
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CATIA V5 – Modelling software
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title and Content
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CATIA V5 – Modelling software
Study case silencer – in CATIA V5 Acoustic model – in CATIA V5
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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CATIA V5 – Modelling software
• Surface denomination in CATIA V5
– In this case keep track of extrusions at inlet and outlet:
HAR11 to HAR31 and HBR11 to HBR31 in COMSOL
10th of May 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo / Master thesis / Half-time Presentation
Title and Content
• In-built methods (scripts) in Application Builder
− Surface Tracking: allows to keep track of surface names from CATIA V5
− Couplings: links variables to surfaces, functions of interpolation and other operators
− Discretisation: allows to apply a different mesh to a specific surface
− Boundary conditions: applies boundary conditions to all domains and boundaries
− Study and result
• Local Optimisation
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COMSOL – Simulation software
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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local optimisation
• Optimisation over perforated platelength L_test
• Initial L_test value was 0.054 [mm]
Acoustic model – in COMSOL Multiphysics
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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LOCAL OPTIMISATION
• TL increased 2 [dB] withL_test = 0.065 [mm]
• Longer perforated plate Higher TL value
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title and Content
• Settings
− 250 iterations for first case, 14 variables and 3 responses
− 150 iterations for case with local optimisation, same number of variables and responses
− 3 objective functions: difference with fictive maxima for three small frequencyintervals
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HEEDS – Optimisation software
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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HEEDS – Optimisation softwareName Best Value Change
Average_difference 25.5534 −0.42%
Average_difference_2 35.2458 −3%
Average_difference_3 25.0784 −2%
Stage_1_diameter 344.1 −0.55%
Stage_2_diameter 185 3%
Outlet_flange_width 14.7 22%
Inlet_tension_top 1.04 −48%
Mid_section_angle 18.36 −8%
Stage_1_tension_top 0.668 34%
Stage_1_tension_bottom 0.713 −29%
Stage_1_start_length 18.1 −9%
Inner_dispenser_shape_offset 21.5 8%
Blade_curve_angle 14.54 −14%
Outlet_interface_protrusion 6.08 −24%
Upper_in_tension 0.612 22%
Lower_in_tension 2.192 10%
Left_in_tension 2.008 0.40%
• Results:
− Optimisation of transmission loss quite low: less than 5%
− Inter-dependencies amongparameters
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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HEEDS – Optimisation software
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
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future work
• Optimisation of Insertion Loss (IL)
– Determine how to find IL in COMSOL Multiphysics, or
– Include software SIDLAB in proposed method
• Combine work with other master thesis workers at NXD
• Detail investigation on how to optimise (IL)
• Keep contact with support team from HEEDS and COMSOL Multiphysics for connectivity updates
3rd of June 2019 NXDE – NXPS / Antoine Bouilloux-Lafont & Rubén Noya Pozo
Title Slide
questions?
thank you for your attention!
