Integration of Hydraulic Lag-Damper Models with Helicopter Rotor Simulations

摘要

This paper describes the design and integration of a generic hydraulic lag-damper model into an industrialnhelicopter rotor simulation code. The paper explains the details of an implementation of a computational platformnintegrating the rotor simulation code with a damper model.Aparametric physical damper model is developed here innorder to allow physically consistent improvements to helicopter performance studies. Further, this model enablesninvestigating novel uses of lag dampers, such as for vibration reduction. The physical consistency of this work isndemonstrated in two case studies. In the first instance, the damper laboratory experimental data are used for ancorrelation and validation study illustrating the capability of the modeling methodology to generate the model withnrefined response predictions. The second case study considers a physics-based lag-damper model with an active flownrestrictor based on a modified version of the validated passive damper model. This realistic model is shown to be ablento induce physically consistent changes in the nonrotating rotor-hub responses. A parametric study with harmonicnthree-per-revolution flow-restrictor activity suggests that significant load changes are possible in the nonrotating inplanenhub forces and moment. The study also shows possible tradeoffs such as high damper peak forcesncorresponding to the reduced in-plane forces. Therefore, the presence of these tradeoffs will require the use ofnconstrained optimization formulation to address more complex problem configurations.