Abstract
The practical problems that usually come up during the on-vehicle testing of motor car shock absorbers have been discussed. Results of example tests carried out to the EUSAMA standard procedure were compared to the test results obtained with using newer methods, i.e. the phase angle method and half power bandwidth method (HPBM). The issue of incompatibility of the typical excitation applied by diagnostic suspension testers with one that often occurs in the road conditions has also been raised. It has also been shown that the wear of shock absorbers may affect the value of braking deceleration of cars with ABS (anti-lock braking system) when moving on uneven ground.
 The main objective of the work was to assess usefulness and reliability of various diagnostic methods intended for the on-vehicle testing of car shock absorbers.
Highlights
The technical condition of automotive shock absorbers is essential for vehicle motion safety and occupants’ comfort
Summing up, based on the results shown, in the case of the half power bandwidth method (HPBM) method, we can talk about a slight influence of the tire pressure and a significant influence of sliding friction
One has to be aware of the fact that in the conditions where the EUSAMA test result is good, i.e. the EUSAMA indicator value is higher than 40 %, the amplitude of the viscous damping force only slightly exceeds the value of the force of sliding friction Fts1min/max in the suspension system
Summary
Resume The practical problems that usually come up during the on-vehicle testing of motor car shock absorbers have been discussed. Results of example tests carried out to the EUSAMA standard procedure were compared to the test results obtained with using newer methods, i.e. the phase angle method and half power bandwidth method (HPBM). The issue of incompatibility of the typical excitation applied by diagnostic suspension testers with one that often occurs in the road conditions has been raised. It has been shown that the wear of shock absorbers may affect the value of braking deceleration of cars with ABS (anti-lock braking system) when moving on uneven ground. The main objective of the work was to assess usefulness and reliability of various diagnostic methods intended for the on-vehicle testing of car shock absorbers.
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