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The coupled rotorcraft/sling load modeling tool developed was applied for simulating the sling load operation of UH-60L and CH-47D helicopter. The simulation results were compared with measured sling load flight test data and a very satisfied agreement was obtained. The simulation model was also integrated with ART's HeliFlight simulator and a pilot-in-the-loop evaluation was conducted that further validated the simulation.

Project 14: HeliQuiet

Summary of Services Performed: Couple RCAS with CFD codes to provide a design environment for quieter rotor blades

Helicopter Quieting Program (University of Maryland/Stanford University)

As a part of DARPA’s Helicopter Quieting Program (HPQ), ART supported the integration of RCAS with the CFD code from Stanford University (SUmb).  This activity involved the development of UH-60 aeroelastic rotor model and analysis of the model in high speed, low speed and high thrust conditions. The results of the coupled code compared well with flight test results.

Helicopter Quieting Program

As a part of DARPA’s Helicopter Quieting Program (HPQ), ART supported the integration of RCAS with the Rockwell Scientific CFD code WINDUS. This activity involved the development of UH-60 aeroelastic rotor model and analysis of the model in high speed, low speed and high thrust conditions. The results of the coupled code compared well with flight test results. In addition, ART developed an aeroelastic rotor model of HART II and completed the required initial runs prior to the coupled CFD-RCAS runs.

Project 15: Advanced Multi-Aircraft Shipboard Landing Model

Summary of Services Performed:  Model aerodynamic interaction of multiple aircraft in a shipboard environment

The goal of this SBIR was to develop physically based advanced aircraft/ship dynamic and aerodynamic interaction models to support multi-aircraft shipboard landing simulation. The work emphasized the development of critical modeling components for the multi-aircraft interaction including an advanced horseshoe vortex model for wing interference and an advanced finite state dynamic wake module and time-accurate distorted vortex model for rotor wake solution. To fully address the complicated multi-aircraft/ship interaction, efforts were also made toward a comprehensive integration of each modeling aspect including ship dynamics, ship airwake, high fidelity rotorcraft blade element model, accurate landing gear modeling, rotor wake/ship deck aerodynamic interaction, and rotor wake interference.

The development of multi-aircraft interference modeling and simulation will strongly benefit aircraft shipboard operations and support the process of design, training, and planning. It will also benefit commercial airlines for take-off and landing safety and improvement of terminal area operation efficiency.

The following is additional reference information:

Advanced Rotorcraft Technology, Inc.

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