Research on Dynamic Stiffness of Bi-Chambered Shock-Absorber of Helicopter Landing Gear

Mathematical model of a bi-chambered shock-absorber was presented and model parameters were identified based on static test data. Then the static load and dynamic stiffness with shock-absorber static displacement were resolved from above mathematical model. Results demonstrate that the predicted static displacement and dynamic stiffness were correlated well with test data. Nonlinear stiffness performance was shown significantly as static displacement varied. Vibratory frequency had little influence on shock-absorber stiffness, while filled gas press of high and low chambers had a large impact on stiffness.