Bond graph concepts applied to an aircraft brake system

Abstract

© 2020 Proceedings of ISMA 2020 - International Conference on Noise and Vibration Engineering and USD 2020 - International Conference on Uncertainty in Structural Dynamics. All rights reserved.A Bond Graph model for a light business aircraft and its brake system has been developed. The dynamic response of the aircraft is analyzed with two degrees of freedom considering it as a rigid body. Dual stage servo-valves, the hydraulic tubing and hoses, and brake assemblies behavior are considered on the analysis. The simulations are run using 20-Sim® software. Braking performance efficiency is assessed considering three different methods: Torque Method (AC 25-7D), Stopping Distance Efficiency and Developed μ Efficiency Methods (SAE AIR1739B). For each method, an On-Off pressure and slip control technique is implemented. The analysis of the results provides key insights for a better correlation between aircraft braking performance top level requirements and brake system specification. Therefore, this paper supports system and performance engineers on the definition of more accurate requirements on the aircraft early design phases.