Integrated AVL EXCITE - OptiStruct Software Solution Platform for NVH and Acoustics
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  • 1. 02.07.2014 7th European ATC, Munich June 24th – 26th, 2014 Integrated AVL EXCITE - OptiStruct Software Solution Platform for NVH and Acoustics Bernhard Loibnegger AVL List GmbH Hans-List-Platz 1, 8042 Graz, Austria bernhard.loibnegger@avl.com
  • 2. 27th European ATC, Munich, June 24th – 26th, 2014 AVL EXCITE AVL EXCITE INTRODUCTION AVL EXCITE is a multi-body dynamic software tool, calculating transient in time domain. Bodies can be: Rigid  large systems, short analysis time Flexible  consider body deformation and calculate component stresses AVL EXCITE initially was developed for acoustic analysis in high frequency domain. Therefore it has the following important and basic characteristics:  Consider large number of condensed DOFs (several thousands) per body with feasible analysis time  Detailed EHD contact representation including local deformation. AVL EXCITE covers all important excitation mechanisms in the drive line system with high accuracy, including crank train, valve train, chain and belt drives, gear trains and piston secondary motion This is ensured by various specific and advanced non-linear connectors (joints).
  • 3. 37th European ATC, Munich, June 24th – 26th, 2014 AVL EXCITE INTRODUCTION AVL EXCITE covers the dynamic behaviour of the power unit, the transmission and the entire drive line including vehicle integration. AVL EXCITE works on system and sub-system level. AVL EXCITE has 3 main application fields: NVH from system dynamics to acoustics (structure and air borne noise) EHD contact investigations (bearing evaluation, failure mechanisms and friction) Durability and Strength of components
  • 4. 47th European ATC, Munich, June 24th – 26th, 2014 Integrated AVL EXCITE - OptiStruct Software Solution Platform for NVH and Acoustics From CAD to Air Borne Noise EXCITE Acoustics EXCITE OptiStruct SimLab, OptiStruct
  • 5. 57th European ATC, Munich, June 24th – 26th, 2014 Workflow for Structure Borne Noise Generation of Meshes & Condensation HyperMesh SimLab OptiStruct
  • 6. 67th European ATC, Munich, June 24th – 26th, 2014 Model Preparation & Condensation Tools: HyperMesh, SimLab and OptiStruct  OptiStruct for condensation  provides ease-of-use interface to output EXCITE body property files (.OUT2, .OUT4)  PARAM, EXCOUT  SimLab provides special plugins fulfilling EXCITE mesh requirements  inserting RBE2/RBE3 couplings at journal/pin center nodes  defining retained nodes at predefined areas (e.g. bearings, liner, cylinder head, etc.)  OptiStruct 13.0 will output (.exb) directly (FIRST FE Code!)  PARAM, EXCEXB  OptiStruct 13.0 will generate the inertia invariants for flexible bodies, which perform a global motion
  • 7. 77th European ATC, Munich, June 24th – 26th, 2014 Workflow for Structure Borne Noise Generation of Meshes & Condensation HyperMesh SimLab OptiStruct Creation of EXCITE Model Run EXCITE Simulation
  • 8. 87th European ATC, Munich, June 24th – 26th, 2014 Creation of EXCITE Model Tool: AWS  Setup EXCITE Model  define bodies  define joints (non-linear)  assign external forces  perform kinetic model check  define load cases  speed sweep  run-up  Run EXCITE Simulation  define simulation control parameters  submit jobs using job management system  support of LSF, PBS Pro, etc.
  • 9. 97th European ATC, Munich, June 24th – 26th, 2014 Workflow for Structure Borne Noise Generation of Meshes & Condensation HyperMesh SimLab OptiStruct Creation of EXCITE Model Run EXCITE Simulation Data Recovery OptiStruct
  • 10. 107th European ATC, Munich, June 24th – 26th, 2014 Data Recovery Tool: OptiStruct, EXCITE FE Interface  Data Recovery using OptiStruct  EXCITE generates .INP4 file containing either motion quantities for selected time steps or complex displacements for selected frequency steps  All that is required in OptiStruct :  assign .INP4 file and HyperWorks .h3d file (super element matrices) to the analysis  define subcases (modal or transient frequency response)  request output  Store results in Nastran .op2 file  No DMAP, scripts or macros are required ASSIGN,H3DDMI,AX,name.h3d ASSIGN,EXCINP,10,model.INP4 VELOCITY = ALL SUBCASE 10 LABEL = FREQUENCY RESPONSE METHOD = 10103 DLOAD = 10111 FREQUENCY = 10122
  • 11. 117th European ATC, Munich, June 24th – 26th, 2014 Workflow for Structure Borne Noise Generation of Meshes & Condensation HyperMesh SimLab OptiStruct Creation of EXCITE Model Run EXCITE Simulation Data Recovery OptiStruct Structure Borne Noise Post- Processing
  • 12. 127th European ATC, Munich, June 24th – 26th, 2014 Structure Borne Noise Post-Processing Tool: IMPRESS Chart / 3D, HyperView  Special Structure Borne Noise EXCITE Evaluation Tool  Generation of surface velocity levels  Surface normal levels  Maximum levels  3D color plot for 1/3 octave, octave bands, single frequencies or user defined frequency range  Integral levels of structure parts (selection by material / element property or direct)  Integral levels of structure parts versus engine speed or any other parameter Integral Surface Normal Levels Oil Pan IntegrsalLevel[dB] 630 800 1000 1250 1600 2000 1/3 Octave Centre Frequency [Hz] EHD2 NONL 10 dB
  • 13. 137th European ATC, Munich, June 24th – 26th, 2014 Structure Borne Noise Validation Target Correlation: +/- 3dB Measurement Simulation
  • 14. 147th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Sound Radiation Analysis Workflow Generation of Acoustic WBT Mesh
  • 15. 157th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Automated Generation of the Acoustic Mesh  Interactive 3D viewer for control and optional adjustment of results of each meshing step Model Preparation within Minutes  Starts from unmodified FE mesh used for the calculation of structural vibrations  3D visualization of the stepwise acoustic mesh generation:  3 – detection of inside / outside acoustic mesh elements  1 – based on predefined layer distances a regular mesh of the complete domain is set up Step 1 Patent-pending meshing procedure  2 – refinement of elements which intersect the structure skin Step 2 + 3  4 – all outside elements are merged to reduce the number of elements of the final WBT acoustic mesh Step 4 – final acoustic WBT mesh (blue) and inside elements (red)
  • 16. 167th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Sound Radiation Analysis Workflow Generation of Acoustic WBT Mesh Generation of Acoustic WBT Mesh Creation of Field Point Meshes
  • 17. 177th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Field Point Meshes for Result Evaluation Two Options to Define Field Point Meshes  1 - import of arbitrary predefined meshes (FE format)  2 - use of the integrated field point mesh generator  supported types: sphere and plane  Results with v2014: sound pressure levels in dB or dB(A,B,C)  single frequencies  third octave /octave bands  average / overall levels
  • 18. 187th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Sound Radiation Analysis Workflow Generation of Acoustic WBT Mesh Generation of Acoustic WBT Mesh Creation of Field Point Meshes Generation of Acoustic WBT Mesh Creation of Field Point Meshes Boundary Conditions and Settings
  • 19. 197th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Boundary Conditions and Simulation Settings Simulation Control  Basic settings:  frequency type (single, range or from imported BC), fluid properties, microphone positions etc.  simulation task: check data, sound radiation calculation, result creation  Type and amount of results to be evaluated: 2D/3D, average/overall, 3rd octave or/and octave bands Microphone positions – default or user defined  Boundary conditions:  import of structural surface velocities and mapping to Multi Local Velocities boundary condition Structural surface velocities  optional pressure, velocity or impedance BC (const. or freq. dependent) on selections of the acoustic mesh (MLV surfaces) Boundary conditions on selections
  • 20. 207th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Dynamic and Fully Automated Velocity Mapping Procedure Multi Local Velocity (MLV) Mapping  Mapping – transfer of vibrations from FE Mesh to Gauss Points on closest acoustic mesh surfaces (MLV surfaces)  Number of Gauss Points depends on:  frequency  size of the MLV surface  kind of boundary condition  Indirect Distance Weighting (IDW) method:  resultant complex vector at Gauss Points is a linear combination of the 4 closest FE nodes Benefit Due to fine Gauss Point distributions local effects are considered even with rough acoustic meshes Example: surface velocity amplitudes at 806Hz on structure surface (left) and MLV surfaces (right) MLV surfaces Gauss Points on a MLV surface
  • 21. 217th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics Sound Radiation Analysis Workflow Generation of Acoustic WBT Mesh Generation of Acoustic WBT Mesh Creation of Field Point Meshes Generation of Acoustic WBT Mesh Creation of Field Point Meshes Generation of Acoustic WBT Mesh Creation of Field Point Meshes  Check Data  Sound Radiation  Create Results Simulation Run 2D/3D Post- processing Boundary Conditions and Settings Boundary Conditions and Settings
  • 22. 227th European ATC, Munich, June 24th – 26th, 2014 EXCITE Acoustics 2D and 3D Acoustic Post-processing Fast and Subsequent Definable Result Evaluation on Arbitrary Positions and Field Point Meshes
  • 23. 237th European ATC, Munich, June 24th – 26th, 2014 2D Results: EXCITE Acoustics versus IBEM EXCITE Acoustics v2014 Comparison with IBEM: Example I4 Demo – 3000rpm, 3rd Gear 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 0 500 1000 1500 2000 2500 3000 InputPower[W] Frequency [Hz] IBEM EXCITE Acoustics IBEM EXCITE Acoustics 0 10 20 30 40 50 60 70 80 Mic1 Mic2 Mic3 Mic4 Mic5 Mic6 AverageLevel[dB] IBEM EXCITE Acoustics IBEM EXCITE Acoustics Mic1 Mic2Mic3 Mic4 Mic6 Mic5
  • 24. 247th European ATC, Munich, June 24th – 26th, 2014 Integrated AVL EXCITE - OptiStruct Software Solution Platform for NVH and Acoustics – Conclusion (1) Customer Benefits  Shorter project turn-around times by simplified integrated work flows  Enhanced reliability by less risk for errors due to seamless data transfer between EXCITE and OptiStruct  Increased usability by functionalities enabled through the integrated EXCITE – OptiStruct solution platform
  • 25. 257th European ATC, Munich, June 24th – 26th, 2014 Integrated AVL EXCITE - OptiStruct Software Solution Platform for NVH and Acoustics – Conclusion (2) Sound Radiation in Free Field with Wave Based Technique  Starts from unmodified structural FE mesh  direct use of FE model from structural vibration analysis (no need to close smaller openings, to change element types …)  Automated generation of acoustic mesh  preparation of calculation model with a few clicks  One model for the whole frequency range  no manual or automated mesh modification necessary to achieve an optimal balance between accuracy and calculation time  Subsequent definable post-processing  fast evaluation of results at additional arbitrary positions and field point meshes, no recalculation necessary  Significant short analysis lead time for calculation of airborne noise
  • 26. 02.07.2014 7th European ATC, Munich June 24th – 26th, 2014 Integrated AVL EXCITE - OptiStruct Software Solution Platform for NVH and Acoustics Bernhard Loibnegger AVL List GmbH Hans-List-Platz 1, 8042 Graz, Austria bernhard.loibnegger@avl.com