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Romax Simulation of FRO-16210C Noise

CAViDS Consortium. Romax Noise Simulation. Romax Simulation of FRO-16210C Noise. A CAViDS Consortium Project. Advisory Board Report November 11, 2009. CAViDS Consortium. Romax Noise Simulation. Project Objective.

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Romax Simulation of FRO-16210C Noise

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  1. CAViDS Consortium Romax Noise Simulation Romax Simulation of FRO-16210C Noise A CAViDS Consortium Project Advisory Board Report November 11, 2009

  2. CAViDS Consortium Romax Noise Simulation Project Objective • Simulate vibration and noise generated by FRO-16210C transmission in selected gears and loads over the operating speed range and compare to experimental results

  3. Romax Noise Simulation CAViDS Consortium Approach • Phase 1: Obtain software, hardware and training • Phase 2: Model FRO-16210C transmission and predict: • Gear/shaft/bearing mode shapes • Housing vibration at select conditions • Acoustic noise at same conditions

  4. Romax Noise Simulation CAViDS Consortium Process to Date • Built gear/shaft/bearing model for each of 6 gear ratios • Determined key modes for each • Added housing to each • Added micro-geometry for each gear and optimized • Ran order track response for 3 mesh harmonics and 3 accelerometer positions for 6 gear ratios • Since last meeting • Focused on comparing to Eaton data in 6th gear • Added measured gear profile to model • Compared full model to loaded gear model • Developing plan to close gaps

  5. Romax Noise Simulation CAViDS Consortium Models All gears 10th gear 10th gear with housing

  6. CAViDS Consortium Romax Noise Simulation Eaton Data First Gear Excitation Countershaft Bounce Countershaft Rock

  7. CAViDS Consortium Romax Noise Simulation Eaton Data Drive Gear Excitation Countershaft Rock

  8. CAViDS Consortium Romax Noise Simulation Correlation Plot 1

  9. CAViDS Consortium Romax Noise Simulation Correlation Plot 2

  10. CAViDS Consortium Romax Noise Simulation Correlation Plot 3

  11. CAViDS Consortium Romax Noise Simulation Correlation Plot 4

  12. Romax Noise Simulation CAViDS Consortium Modified Modal Damping

  13. CAViDS Consortium Romax Noise Simulation Profile Modification Check

  14. Romax Noise Simulation CAViDS Consortium Comparison of Models

  15. CAViDS Consortium Romax Noise Simulation Next Actions • Determine why 400 Hz mode dominates • Mostly output shaft rock • Shouldn’t get excited – verify with test • Examine Romax logic • Tune rock mode • Mode shape looks good without housing • Without housing predicts low • With housing predicts lower • With housing mode shape looks more like bender • Look at housing model • Look at actual bearing stiffness vs. predicted

  16. CAViDS Consortium Romax Noise Simulation Next Actions • Fix Bounce • Without housing • Frequency good • Mode shape good • With housing • Frequency OK at 500 LB-FT • Shape changes to rock – why? • Torque stiffening too high –why?

  17. Romax Noise Simulation CAViDS Consortium Romax NVH Capabilities • Gear Optimization for Noise • Helical/Spur • Profile Optimization • Manufacturing Limits • Structural Optimization • Mass Distribution • Stiffness Improvement • Damping Studies • Bearing Geometry Selection • Case Design for Noise • Material Selection • Geometry Optimization

  18. Romax Noise Simulation CAViDS Consortium Romax Assessment • Strengths • Ease of Modeling • Graphics • Support • Modal Visualization/Animation • Gear Geometry Modeling Flexibility/Power • Lessons Learned/Challenges • Prefers NASTRAN FE Housing Importation • Modal screening without housing • Data manipulation for correlation • Link to COUSTYX

  19. Romax Noise Simulation CAViDS Consortium Future Plans Tune gear/shaft model for experimental correlation Tune modal damping selection for experimental correlation Assess Coustyx link to predict noise

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