TM FFT: Solution Brief - Actran SOLUTION BRIEF

Acoustic Simulation for Spacecraft Launch Modeling & Simulating Random Excitations

Design Challenge Key Software Features At lift-off, payload components like satellites or antennas are exposed • Acoustic Finite Elements for cavity to intense acoustic excitations that can damage their structures. and exterior acoustics modeling • Acoustic Infinite Elements or Adaptive Excitations to the Model Perfectly Match Layers (APML) for modeling the far field anechoic condition Excitations to the model can include Diffuse Sound Field (DSF) • Structure elements library: solids, shells, or Turbulent Boundary Layer (TBL) directly on the structure, or composites, laminated structures, randomized plane waves applied to air around the spacecraft membranes, beams, springs, rigid or launch vehicle, which in turn applies the DSF to the structure. connections,­ etc. Internal air volumes and acoustic blankets can also be modeled for a • Poro-elastic element library based on the more accurate simulation. A hybrid frequency response solution is BIOT theory for modeling bulk reacting possible where modal frequency response will be solved on the structure materials and direct frequency response will be solved for the fluid and blanket, • Nastran to Actran translator (NAS2ACT) or anywhere that damping is frequency dependent. to convert Nastran structure models into Results can include acoustic quantities like Sound Power, Sound Actran models Pressure, or directivity, as well as quantities calculated on the • Import of structure modes calculated by structure like stress and deflection. Nastran • Acoustic dissipation mechanisms such as Excitation Types: visco-thermal losses, acoustic absorption • Distributed random excitations: • Random excitations on structure including diffuse sound field, turbulent boundary • Diffuse Sound Field layer and more • Turbulent Boundary Layer • Plane, spherical and cylindrical wave • Local Random Excitations (dynamic) sources • Global diffuse environment • Acoustic pressure, velocity and admittance boundary conditions • Mechanical and kinematic excitations • Full support of non-congruent meshes • Piezo-electric element libraries for modeling active structures • Use vibration results from most FEA structural analysis solvers for acoustic radiation modeling • MUMPS and Krylov solvers for fast frequency response analysis • Rich post-processing capabilities: frequency response plots, maps, sound directivity, directive microphones, animations and more... TM SOLUTION BRIEF FFT: Solution Brief - Actran

Workflow & FEA Interoperability Actran Software Suite Actran can model spacecraft launch acoustics in Actran is a complete acoustic, vibro- the low and mid frequency range for typical sized acoustic and aero-acoustic CAE soft- spacecraft. ware suite. Empowered by the technolo- MSC Nastran structural models can be imported gies of finite/infinite element methods into Actran and converted to Actran models. (FE/IFE), as well as the Discontinuous MSC Nastran, Ansys or Abaqus modal results can Galerkin Method (DGM), Actran provides be imported into Actran, or they can be calculated a rich library of materials, elements, inside Actran. Structural and fluid meshes can be boundary conditions, solution schemes imported into Actran in Nastran, Ansys or Abaqus and solvers. Actran is a high accuracy, high performance and high productivity formats. modeling tool suiting the needs of the most demanding engineers, researchers, Studying Acoustic Excitation teachers and students for solving the Actran offers a unique solution to accurately most challenging acoustic problems. and quickly study the influence of the acoustic excitation on the component structure. Free Field Technologies (FFT) Solutions include: Free Field Technologies is focused • Complete material library: on three main areas: • Developing Actran software for acous- • Structural elements including composites tic, aero-acoustic and vibro-acoustic • Fluid elements simulation; • Porous materials • Providing technical services, sup- • Visco-thermal fluid elements port, training and delivering acoustic engineering projects; • Handling of acoustic treatments • Researching innovative technologies and methods of acoustic analysis in Analyzing System Response - Outputs order to remain the leader in acoustic modeling. Actran can output all the required quantities to perform a complete analysis of the system Free Field Technologies has more response: than 250 customers around the • Structural Results world active in the Automotive, Aerospace, Shipbuilding, • Displacement / Acceleration / Velocity Electronic and Heavy Equipment • Mean Square Velocity industries as well as in the • Stress ( ) σx, σy, σz, τxy, τyz, τzx, σVon Mises Educational and Research sectors. • Energy Levels (Kinetic, Potential) / Injected Power • Acoustic Results FFT is a wholly owned subsidiary • Fluid Pressure of MSC Software Corporation. • Mean Square Pressure FREE FIELD TECHNOLOGIES SA (HQ) • Energy Levels Rue Emile Francqui 9 1435 Mont-Saint-Guibert • FRFs and Maps Belgium Telephone +32 10 45 12 26 • Means, envelopes, standard deviations of any stochastic quantity Fax +32 10 45 46 26 www.fft.be Trusted Solution for the Spacecraft Industry Actran is a commercial finite element code designed specifically for simulating acoustics, vibro acoustics and aero acoustics. It can be used to accurately model structural vibrations, fluid-structure interactions, and turbulence noise propagation. Actran has been relied upon by engineers for 16 years and is used by more than 350 companies and research institutions around the world.

Corporate Europe, Middle East, Japan Asia-Pacific MSC Software Corporation Africa MSC Software LTD. MSC Software (S) Pte. Ltd. 4675 MacArthur Court MSC Software GmbH Shinjuku First West 8F 100 Beach Road The MSC Software corporate logo, MSC, and the names of the Suite 900 Am Moosfeld 13 23-7 Nishi Shinjuku #16-05 Shaw Towers MSC Software products and services referenced herein are trademarks Newport Beach, CA 92660 81829 Munich, Germany 1-Chome, Shinjuku-Ku Singapore 189702 or registered trademarks of the MSC.Software Corporation in the United Telephone 714.540.8900 Telephone 49.89.431.98.70 Tokyo, Japan 160-0023 Telephone 65.6272.0082 States and/or other countries. All other trademarks belong to their www.mscsoftware.com Telephone 81.3.6911.1200 respective owners. © 2014 MSC.Software Corporation. All rights reserved. ACTRANSPACE*2014MAY*SB