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Case 2.4

Automobile Warranty Data. Case 2.4. Reliability Analysis Performed By: Carl Harding. Agenda. Background Information Data Description Failure Analysis Cost Analysis Recommendations. Background Information. Warranty data – prediction of future warranty costs Data Collection

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Case 2.4

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  1. Automobile Warranty Data Case 2.4 Reliability Analysis Performed By: Carl Harding

  2. Agenda Background Information Data Description Failure Analysis Cost Analysis Recommendations

  3. Background Information • Warranty data – prediction of future warranty costs • Data Collection • Distributor of 4-wheel vehicles imported into Australia • Single model year with 5000 units sold • Driving conditions were not recorded

  4. Data Decription • 40,000 km Warranty • Incomplete (n = 329 vehicles) • 297 experience no engine problem during warranty period • 32 experience at least one engine failure • incomplete

  5. Failure Analysis • Minitab Analysis • Distribution ID Plot • Censoring @ 40,000 • Fitness • Lognormal

  6. Failure Analysis • Minitab Analysis • Distribution Overview Plot • Censoring @ 40,000

  7. Failure Analysis

  8. Failure Analysis

  9. Failure Probability Density Reliability/Survival Function Cumulative Failure Probability Density Hazard/Failure Rate Failure Analysis Maple Analysis

  10. Monte Carlo Simulation Maple MTTF

  11. Cost Analysis Minitab Regression Analysis

  12. Recommendations • Design • Manufacture engines to last longer than 40K km • Data collection • Obtain real time maintenance data

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