Sonic Response Analysis (SRA) Tool Vibro-Acoustic Capabilities

Transcription

1 Sonic Response Analysis (SRA) Tool Vibro-Acoustic Capabilities Mostafa Rassaian, Ph.D., P.E., Technical Fellow Structural Technology Boeing Research & Technology Tom Arakawa, Program Analyst, Structural Technology Boeing Research & Technology Phoenix, AZ, April 21-22, 2009

2 Outline MSC.Software Confidential Acknowledgements Objectives Background SRA Process Unique Capabilities Pre- and Post-Processing Features Applications Validation Summary Future Work 13/04/2009 2

3 MSC.Software Confidential MSC Acknowledgements MSC Random Mohan Barbela: Manager, Global Technical Support Jim Leedom: Sr. Lead Application Engineer PATRAN Larry Pearce: Sr. Lead Application Engineer Tom Walin: Lead Application Engineer NASTRAN Jack Castro: Global Technical Program Manager Boeing Lance Proctor: Sr. Lead Application Engineer Dean Bellinger: Principal Technical Representative Logistics and Support Keane Barthenheier: Sr. Account Manager Boeing 13/04/2009 3

4 SRA Tool Objectives MSC.Software Confidential MOTIVATION: Provide a common automated process for typical acoustic or vibration analysis using innovative algorithms Enhance current MSC capabilities by embedding innovative unique features into a single-glass toolbox IMPORTANCE: Provide a disciplined and a consistent approach for vibro-acoustic analysis Increase productivity, efficiency and reduce errors Eliminate ad hoc methods and processes POTENTIAL: Provide a best practice common process to be used across the enterprise and industry 13/04/2009 4

5 Correlated Sources FEM/BEM vs. FEM-only MSC.Software Confidential BEM/FEM Analysis NASTRAN + Virtual.Lab Cross-spectra of Pressure Coupled Structural-Acoustic Response Acoustic Loading FEM Analysis SRA+NASTRAN Cross-spectra of Force Uncoupled Structural Response No Acoustic Loading Computational Efficiency Cross-Spectra Decomposition Partition of Aero-acoustic Loading FEM FEM - - Subdivide Subdivide the the structure structure - - Smaller Smaller number number of of partitions partitions BEM/ BEM/ FEM FEM - - Smaller Smaller number number of of elements elements - - Fully Fully coupled coupled model model Diffuse: TBL: sin S12 ( r, ) S11( ) S 12 (,, ) 1 S ( 11 2 S 11 ( ) e kr kr 1 power spectra of the pressure field 1 i1 / U ph e 2 2 e

6 Background MSC.Software Confidential Developed a prototype N-FEARA (NIKE3Dbased) tool as a benchmark Initial implementation of N-FEARA in Nastran/ Patran as a common vibro-acoustic analysis tool for Enterprise (2000) Target customers: JSF and Sonic Cruiser (2001) N-FEARA Process Flow 13/04/2009 6

7 Legend Solution Phase Pre-Process Post-Process Patent Disclosures Structure FEM Base Excitation Point Load Partitioning X-Correlation Define Loading MSC.Software Confidential SRA Process ( ) Reduced Method X-Correlation 7,430,499 Sonic Static Pres. (preload) Thermal (preload) Solution 106 Preload (optional) Shaker Table Link Generate Random RANDPS file Preload Check 6,363, Maneuvering Loads, Raptor Linear NASTRAN Normal Modes Solution 103 Linear NASTRAN Dynamic Response Solution 111 Input Spectrum DaDt Link Lifeworks Life Calc. Modal Strain Energy Mid- Range Frequency Modal Contribution Random Analysis SRA Environment Frequency Response Margin Check Allowables Harmonic Input Static+Thermal (preload) Combined S-n Data Life Prediction

8 Unique Capabilities Shaker table link MSC.Software Confidential Preload (static, thermal or both) Partitioning algorithm for complex load definition Random analysis for mid-range frequency Boeing DADT Lifeworks interface for load spectrum generator Reduced method for cross-correlation Modal strain energy 13/04/2009 8

9 MSC.Software Confidential Shaker Table Link Capabilities Vibro-acoustic Analysis Setup Vibro-acoustic Postprocessing Sound Pressure Level (plane wave) Acceleration PSD Derived Environment SPL (db) Acceleration PSD (g 2 Hz) Frequency (Hz) Frequency (Hz) Shaker table input Rassaian et al. US Patent # 6,363,789

10 Preload Capabilities MSC.Software Confidential Couple Couple thermal thermal exhaust exhaust wash wash effects effects with with high-speed high-speed aerodynamic effects effects in in the the same same structural structural model model Setup/run preload SOL106 (nonlinear) job Notify user if run successful, failed or buckling load exceeded (thermal preload) Thermal Pressure Pressure+ Thermal No thermal effects If SOL106 run okay RESTART with modified shape. Run SOL111 (FRF) OR SOL103(Strain Energy) job With thermal effects Notify user if run failed Rassaian et al. Invention Disclosure #

11 MSC.Software Confidential Partitioning Capabilities 3 partitions Standard Partition Method 5 partitions Rassaian et al. Invention Disclosure # Advanced Partition Method Coarse Mesh Elements (partition cells) Fine Mesh Elements (to be partitioned) Partitioned Fine Mesh Elements

12 MSC.Software Confidential Modal Strain Energy Capabilities Damping Estimation Modal Modal Strain Strain Energy Energy evaluation evaluation --Elements Elements groups: groups: Skin, Skin, frame, frame, and and stringer stringer --Cases: Cases: Unpressurized and and pressurized pressurized --A high high level level of of of of modal modal strain strain energy energy high high levels levels of of modal modal displacement effective effective damping damping treatment treatment * s = s i i x SE i SE i Modal Response (SOL 103) Rassaian et. al, Disclosure # Detailed FEM Sol 106 Pre-Load Modal Strain Energy Material Loss Factor System Damping (Modal) For preload, an approximate and accurate MSE: (Proctor s and Harder s methods)

13 MSC.Software Confidential Pre-Processing Features Menu: Menu: Setup Setup FRF FRF & Run Run Analysis Analysis Purpose: Purpose: Setup Setup analysis analysis job job for for one one of of the the following: following: Acoustic Acoustic Random Random Vibration Vibration Vibration Vibration and and Acoustic Acoustic (for (for Shaker Shaker Table Table Link) Link) Optional GRAV Load Large mass Plane Wave (In Phase) Progressive Wave Turbulent Boundary Layer Uncorrelated Reverberant Wave

14 MSC.Software Confidential Post-Process Features PSD XY Plot RMS Fringe Plot Miles Equation Modal Contribution View Mode Shapes Check Preload Modal SE table/plot Threshold Criteria

15 MSC.Software Confidential Applications

16 MSC.Software Confidential MSE: Response to Turbulent Boundary Layer Adam A700 Full Door Model Emergency Door Replaced with Composite Test Panel 1.E Ac c e le ratio n P S D a t N o d e Acceleration PSD, (in/s^2)^2/hz 1.E E E P F 1 P F 2 P F 3 P F 4 1.E F re q u e n c y, H z

17 Noise Control Design MSC.Software Confidential Environment TBL Source Field SRA/ NFEARA Validation Against Flight Data Test vs. Analysis Random Acoustic Ambient Environment p i Pressure Random Random Acoustic Acoustic Analysis Analysis TBL Results show good agreement between test & analysis Shockcell

18 MSC.Software Confidential CMC Material for Hot Structures Preload + Plane Wave Analysis Hot day idle condition Coupled thermalacoustic response Sound Pressure Level Von Mises Stress eff Integrated Integrated approach approach to to heat heat transfer, transfer, thermal thermal stress stress and and acoustics acoustics

19 Tool Validation Progressive Wave N-FEARA MSC.Software Confidential TBL N-FEARA vs SYSNOISE DTV10 Pathfinder Acoustic Test Predictions: RMS Hz 1.E+02 1.E+01 Accel PSD (G 2 /Hz) 1.E+00 1.E-01 1.E-02 Test 607N, Bay 7, last 15 sec., 61.9 Grms SRA 0dB, Adv RevA SRA, 607N, 61.9 Grms 1.E Frequency (Hz) Progressive Wave SRA TBL N-FEARA vs SRA Strain PSD ( 2 /Hz) 1.E+03 1.E+02 1.E+01 1.E+00 Diffused SRA vs Test Data DTV10 Pathfinder Acoustic Test Predictions: RMS Hz 1.E-01 1.E-02 Test 617S, Fwd LL Radial Rib, above cut-out, A1-1, last 15 sec., 62.3 microstrain-rms SRA 0dB, Adv RevA SRA, 617S, 75.7 microstrain-rms Frequency (Hz) Verification Verification for for pre-load pre-load using using SYSNOISE, SYSNOISE, N-FEARA, N-FEARA, NASTRAN, NASTRAN, ATLAS ATLAS

20 MSC.Software Confidential Summary SRA is a Boeing standard analysis tool used for cert by analysis Validated for a variety of platforms Automates set up of random loads in a single Patran menu system SRA is primary for noise control design: Damping, Isolators Evaluation of complex structure Complex source fields SRA historical uses: Pressure and temperature pre-load Modal strain energy Aero-acoustic source in structural response.

21 2015 Vision Next Generation MSC.Software Confidential Utilization MSC SimXpert * SYSNOISE/ VL (LMS) Interface using SimMgr Simplified damage assessment of composite structures Deploy as an Enterprise Standard Tool Deploy as a Standard Tool across Industry Composite Durability Tool Nonlinear Reduced Order BEM/ FEM Coupling * Engage MSC to incorporate SRA in SimX (MSC Random)

22 MSC.Software Confidential Contact Details: For further information please contact Mostafa Rassaian Boeing Company P.O. Box 3707 M/S Seattle, WA USA Telephone Number Address: 13/04/