Dual-phase damping in a landing gear at touch-down

Simulation of non-linear variable dampers using energy similarity

Abstract: A local equivalent linearization methodology is proposed to simulate non‐linear shock absorbers and dual‐phase dampers in the convenient frequency domain The methodology based on principle of energy similarity, characterizes the non‐linear dual‐phase dampers via an array of local damping constants as function of local excitation frequency and amplitude, response, and type of non‐linearity The non‐linear behaviour of the dual‐phase dampers can thus be predicted quite accurately in the entire frequency range The frequency response characteristics of a vehicle model employing non‐linear dual‐phase dampers, evaluated using local linearization algorithm, are compared to those of the non‐linear system, established via numerical integration, to demonstrate the effectiveness of the algorithm An error analysis is performed to quantify the maximum error between the damping forces generated by non‐linear and locally linear simulations The influence of damper parameters on the ride improvement potentials of dual‐phase dampers is further evaluated using the proposed methodology and discussed