Methods and procedures in order to measure the wear/aging in automotive shock absorbers in real time on the vehicle. What values and parameters can be used for this aim.
Once the shock absorber seal gets damaged due to longer usage of shock absorber, the oil will come out. Otherwise the shock absorber will have maximum age
There are only two possible ways:
1) Visual inspection as suggested by Karikalan Loganathan.
2) For real time performance monitoring, load cell and displacement sensors needs to be mounted to measure real time force, displacement and velocity. Any deviation in the force-displ and force-velocity diagram will indicate the wear/aging.
Another alternative with reduced sensor requirements is to measure the RMS suspension displacement, and compare left to right (or compare with historical data). If the displacement begins to increase on one side compared to the other, the damper must be worn.
For longer term use, you could compare the suspension displacement with historical data (I say for longer term, as driving down a bumpy road would cause larger displacement in the very short term).
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