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1 Free Field Technologies SFA Conference Toulouse the 25 th of November 2010 Copyright Free Field Technologies
2 Free Field Technologies Free Field Technologies is a technical leader in the field of acoustic, vibro-acoustic and aero-acoustic CAE The company has three main activities: Development of the ACTRAN software suite Provision of related services: training, consulting, technology transfer, methodology development, installation and performance tuning, custom developments, CAE process automation Research in acoustic CAE and related fields Headquarters - Mont-Saint-Guibert near Brussels, Local offices - Toulouse, Tokyo, and Troy. ACTRAN is used by over 250 industrial customers worldwide. 2 Copyright Free Field Technologies
3 FFT s Engineering Services FFT Engineering Services are offered from FFT s headquarters in Belgium FFT s French office in Toulouse FFT s local office in Tokyo Human Resources: 15 highly skilled staff with thorough acoustics and structural dynamics background Deep experience in numerical acoustics, vibro-acoustics and aeroacoustics consultancy projects for the automotive and aerospace industry such as intake and exhaust noise, NVH of trimmed body, engine noise radiation, HVAC noise, Side Mirror Noise, windows transparency, Also skilled in using other CAE software and high-performance computing resources 3 Copyright Free Field Technologies
4 The ACTRAN software suite ACTRAN for NASTRAN ACTRAN DGM ACTRAN Vibro-Acoustics ACTRAN Aero-Acoustics ACTRAN TM ACTRAN Acoustics ACTRAN VI 4 Copyright Free Field Technologies
5 ACTRAN Acoustics General purpose acoustic modelling tool Target applications Sound propagation in ducts Sound diffraction by rigid obstacles Sound radiation by vibrating structures High-performance solvers and parallel processing Exhaust Muffler HVAC Module Gearbox Radiation 5 Copyright Free Field Technologies
6 PowerTrain Radiation 1. PWT Skin Mesh with Panels 2. Finite element mesh 4. Post-process in ACTRAN 3. ACTRAN model building COMPUTATION Mechanical results for excitation 6 Copyright Free Field Technologies
7 ACTRAN VibroAcoustics General purpose vibro-acoustic modelling tool Large finite element and material library: acoustic finite and infinite elements incl. pyras and pentas visco-elastic elements for beams, shells and solids Composite elements allowing also the handling pre-stress effects (new) Porous and poro-elastic finite elements Piezo-electric elements for modelling active structures (new) Realistic excitation mechanisms: acoustical, kinematical and dynamical excitations turbulent boundary layer diffuse sound field Loudspeaker Side window transmission Muffler Radiation 7 Copyright Free Field Technologies
8 VibroAcoustics Target Applications Complex Intake & exhaust system Transparency computation Trim analysis component or global level Random vibro-acoustics Side window or windshield submitted to a random aerodynamic excitation. Satellite and/or its embarked components (antennas, solar array panels ), rocket nozzle, rocket fairing during launch process TBL noise on the aircraft fuselage transmitted to the cabin Radiating structures with strong couplings Ship building... See applications in dedicated presentations 8 Copyright Free Field Technologies
9 ACTRAN AeroAcoustics Broadband aero-acoustics modelling tool (vortex noise) Key features Direct link to most CFD codes Validated by experiments for fans, side window noise and simplified Air Conditioning systems References: Daimler, BMW, VW, Delphi, Visteon, John Deere, Brothers, PSA... Fan noise Air conditioning duct Correlation to test 9 Copyright Free Field Technologies
10 Automotive HVAC Experimental Set-Up ACTRAN Results 906 mm 415 mm CFD Results - Fluent A better agreement could be reached : A longer CFD input would provide a better frequency resolution, A finer CFD mesh would increase the accuracy of the levels (current = 600k FV) 10 Copyright Free Field Technologies
11 Turbulent Wall Pressure Fluctuations (TWPF) Unsteady CFD Computation icfd excitation generation Integration / Projection DFT time domain pressure field frequency domain distributed load ACTRAN vibro-acoustic model ACTRAN/VI post-processing 11 Copyright Free Field Technologies
12 ACTRAN TM Exclusive tool for the modelling of noise radiation by aircraft engine and other turbomachines Key features: excitation defined in terms of duct modes propagation in a non-uniform background flow accurate modelling of liners References: Airbus, Rolls-Royce, SNECMA, General Electric, MTU, Honeywell, Liebherr, Turbomeca, Aermacchi,... Aermacchi Airbus Airbus 12 Copyright Free Field Technologies
13 Case Study: APU Intake ACTRAN Model Infinite elements Results Admittance BC Modal basis Mean flow computed by Fluent 13 Copyright Free Field Technologies
14 ACTRAN/DGM Objective: solve exhaust turbine noise Key features Linearized Euler Equations (LEE) DGM scheme in the time domain Non-structured mesh Import the RANS-based mean flow from most standard CFD codes Each best element chooses its best order (1 to 16) Complex Exhaust Flow Acoustic field TURNEX Project 14 Copyright Free Field Technologies
15 3D Effects Bifurcations and pylon AIAA_2009 : Exhaust noise prediction of realistic 3D lined turbofans submitted to strong shear layers, R. Leneveu, B. Schiltz, Y. Druon, A. Mosson, Airbus France, FFT The devices modify the propagation in the far field Must be taken into account Such a model is very large (200 m³ of fluid) and a DGM approach is required Geometry of realistic 3D exhaust with its devices Shear layers Mean velocity at flight sideline condition 5 db Effect of the bifurcations - Far field directivity - Mode (13,1) 1 st BPF 15 Copyright Free Field Technologies Unstructured 3D mesh
ACTRAN Modules. Products overview. Copyright Free Field Technologies
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