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Suspension Tester for Damping Efficiency Assessment in Field Tests

This suspension tester field test survey focuses on determining and assessing the damping efficiency of vehicle axles using the Lehr Damping Ratio. The survey analyzes the test results of conditioned dampers and compares them for different vehicle classes. The analysis includes the survey of 1521 vehicles, identifying absolute defects based on mileage and axle load. The overall median value of the damping ratio is calculated, and the failure rates for absolute and relative limits are presented. The survey also explores the relative difference in damping ratio based on the Lehr method.

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Suspension Tester for Damping Efficiency Assessment in Field Tests

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Presentation Transcript

  1. Suspension tester field test survey(Damping ratio)(Translated by Frank Beaujean)

  2. Sites of the field test equipment

  3. Definition of limit values To determine and assess the damping efficiency of the axle of a vehicle the system uses the physical value „Damping ratio according to Lehr“ These are the assumptions for the good/bad assesment of damping efficiency: Relative limit value : A shock absorber is considered as defective if its dampiong ratio is relative 40% less then the other vehicle side of the tested axle Absolute limit value : A shock absorber is considered as defective if he looses 80% of its damping efficiency. („20%-Dämpfer“)

  4. Comparison of test results of conditioned dampers (20%; 50% and 100%) using two different vehicle classes. The damping ratio of 0.1 is the median value of conditioned 20% dampers

  5. Analysis of the survey

  6. Fieldtest survey of 1521 vehicles – 63 vehicles (4,1%) show absolute defect. Mileage in km

  7. Fieldtest survey of 1521 vehicles – 63 vehicles (4,1%) show absolute defect. Axle load in kg

  8. Analysis of the 63 vehicles with absolute defect Mileage in km

  9. Analysis of the 63 vehicles with absolute defect Mileage in km

  10. Overall median value „damping ratio“ of all tested vehicles Front axle Rear axle Left side Right side

  11. Overall median value „damping ratio“ of all tested vehicles Red = rear axle Blue = front axle Manufacturer‘s

  12. Overall number of tested vehicles Manufacturer‘s

  13. Absolute and relative failure rate (if more then 30 vehicles have been tested of this manufacturer) Red = absolute / Blue = relative Manufacturer‘s Manufacturer‘s

  14. Statistic distribution of the milage of all tested vehicles

  15. Overall median value of the damping ratio to milage Blue: Front axle Red: Rear axle Mileage in km

  16. Overview: How much vehicles (in percent) would fail on the relative difference Result: At 40% difference about 5.26% of all vehicles would fail on relative difference Relative limit value (difference)

  17. Comparison on relative and absolute limt values of all tested vehicles: Yellow: Relative limit (40%) => 5,26% failure rate Blue: Absolute limit (0,1) => 4,1% failure rate Intersection: Relative and Absolute => 5,8% failure rate Relative difference Damping ratio (Lehr)

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