Multiphysics Simulation of Pylon Fluid-Elastomeric Isolators

A coupled fluid-structure interaction (FSI) simulation was developed to evaluate a new design feature in the LIVE® vibration isolation system of the 505 Jet Ranger X. Efficient modeling of fluid and elastomeric characteristics is enabled by simplifying the internal fluid boundaries and adjusting fluid compressibility. The approach provides an accurate analysis of the internal loading within the LIVE structure. Computed results substantiate the LIVE design in terms of strength, durability, and component deflection. The FSI simulation also supports dynamic tuning of the LIVE to achieve the target operating frequency. Validation is demonstrated by comparison to laboratory test measurements. Correlation to test results, in terms of fluid pressure, is within 3.5% and correlation to natural frequency is within 5%.