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Modeling and Validation of an Oleo-Pneumatic Damper with Mechatronic Subsystems for CS-23 General Aviation Aircraft

This paper deals with common modeling methods of an oil-pneumatic damper for CS-23 general aviation aircraft with extended mechatronic subsystems and shows their as-sumptions and physical transferability. Based on this, a generic thermodynamic damper model for a wide operating range is derived, allowing the use of more precise thermal equations, such as the Peng-Robinson equation. In particular, the most commonly used damper without separator is modeled, taking into account the heat loss from the gas during compression. This effect is assumed to be major cause for the hysteresis in the pressure-volume relation of such dampers. Parameterization and validation are done using a damper prototype tested on a drop test bench. For the existing assumptions and different scenarios, the model results show high agreement for all experiments.