Technical Paper
A New Test Method to Characterize the Behaviour of Hydraulic Damper
2010-09-28
2010-32-0101
Typically the velocity dependent hydraulic damper characterization is done using a sinusoidal input to the damper. Damping force vs. displacement and velocity plots are used to represent the damping behaviour. It was observed that the dampers exhibit equal damping characteristics using this conventional method, shows a significant difference in ride comfort levels of the vehicle. This behaviour primarily arises due to the variation in response of the damper with the excitation frequency. On actual riding conditions, apart from harmonic loads, the suspension experiences impact loads that affect the damping generation characteristics. So the damper also needs to be characterized with variation of frequency ranging from 0.5 Hz to 25 Hz. Due to the limitations of damper stroke and input frequency, complete characterization of damper is not possible with sinusoidal input test rig.
