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- THETA BSM NVH ISSUES -

- THETA BSM NVH ISSUES -. 2004. 07. 29. POWER-TRAIN NVH TEAM. ▣ AGENDA. HMC VEHICLE AUDIT RESULT - HMC STATUS OF BSM NVH ISSUES – HMC BSM NVH IMPROVEMENT MASTER PLAN – METALDYNE BSM NVH IMPROVEMENT PROPOSAL - HMC. ▣ I. HMC VEHICLE AUDIT RESULT - HMC.

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- THETA BSM NVH ISSUES -

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  1. - THETA BSM NVH ISSUES - 2004. 07. 29. POWER-TRAIN NVH TEAM

  2. ▣ AGENDA • HMC VEHICLE AUDIT RESULT - HMC • STATUS OF BSM NVH ISSUES – HMC • BSM NVH IMPROVEMENT MASTER PLAN – METALDYNE • BSM NVH IMPROVEMENT PROPOSAL - HMC

  3. ▣ I. HMC VEHICLE AUDIT RESULT - HMC • HMC`s audit result has revealed that BSM gear whine noise is unacceptable for some modules, regarding the interior sound quality of NF vehicle. • Now the BSM whine issue is one of the top HMC’s quality problem items. • From recent engine and vehicle test, it can be concluded that MD`s EOL test criteria is not adequate. - Having good correlation of EOL test and whine noise is important. • Root cause analysis and improvements should be followed.

  4. ▣ II. STATUS OF BSM NVH ISSUES – HMC • Whine Noise. • Quality problem – module to module variation is large. • Ground gear effect It reduces the whine noise (Recent modules have 70th order whine.) Break-in effect –no reduction of whine noise on engine test. • Rattle Noise. • Sound quality problem especially out of cabin

  5. ▣ III. BSM NVH IMPROVEMENT MASTER PLAN – METALDYNE • BSM NVH Improvement master plan

  6. ▣ IV. BSM NVH IMPROVEMENT PROPASAL - HMC • Whine Improvement • HMC Rig test result shows a reasonable correlation between BSM vibration and noise. From this rig test result, good correlated EOL test will be increase production capability. • Necessity of Sweep test • Root cause analysis and countermeasures. • Rattle Improvement • Reasonable Rig test method • Necessity of Sound Quality Analysis • Root cause analysis and countermeasures.

  7. ▣ II. STATUS OF BSM NVH ISSUES – HMC • Stand Break-in effect FLJ, Averaged level ( RH, LH, Front ) After BI Before BI Before BI After BI

  8. ▣ II. STATUS OF BSM NVH ISSUES – HMC • Ground gear effect – Transfer gear set, PDG, PCW Averaged level ( RH, LH, Front ) FLJ PCW PDG 96th 70th 70th

  9. BSM SPEC. Sound Quality level. Kurtosis presents a impulsiveness of signals ▣ II. STATUS OF BSM NVH ISSUES – HMC • Sound Quality Analysis results shows backlash effect .

  10. ▣ IV. BSM NVH IMPROVEMENT PROPASAL - HMC • HMC Proposal

  11. ▣ IV. BSM NVH IMPROVEMENT PROPASAL - HMC • HMC Proposal

  12. Correlation Between Rig and Whine • - 2000~3200 RPM Sweep • Correlation Between MD EOL and Whine • - Steady 1200rpm Meshing NG O.K 4 SET O.K 6 SET Meshing OK 0.65G 1.25G Correlated Rig Noise level ▣ IV. BSM NVH IMPROVEMENT PROPASAL – Whine #3 Comparison of MD EOL with HMC RIG Test Correlation • MD EOL has correlation only below 0.65g because of poor correlation below 1.25g that has 3 NG module. • Rig Test using rpm sweep data has good correlation than EOL test and will increase OK sample. Engine Noise level

  13. Overall Noise Level Sound Quality Level FKX Modified FKX Modified ▣ IV. BSM NVH IMPROVEMENT PROPASAL – RATTLE #4 Rattle Improving Case • Provide large Hole on BSM lower case • Supply oil in BSM to get the sufficient drag torque on B/Shaft  less impacting energy, less rattle.

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