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Summary of Services Performed:

Enhanced ship airwake integration with ship model and flight dynamics model

All previous shipboard rotorcraft analyses were based on the ship airwake variation generated from a steady ship forward motion. This research focused on investigating the effects of unsteady ship motion and the ship airwake generated from that motion on the shipboard rotorcraft flight dynamics.  The study showed remarkable effects of the ship motion on the shipboard rotorcraft flight dynamics. An advanced turbulent ship airwake model was derived that reflects the effects of the ship motion. This research also developed modeling technology for the rotor/ship aerodynamic interaction that addresses the unique aerodynamic phenomena under shipboard operational conditions, including partial and dynamic ship deck effects and the interaction of the rotor downwash with the ship airwake. The development of shipboard rotorcraft flight control options can greatly benefit from these advanced modeling features.

Project 21: Generation of Consistent Rotorcraft Dynamic Models for Life Cycle Simulation Support

Summary of Services Performed: Utilize simulation models traceable to a common comprehensive simulation model for all stages of flight vehicle life cycle; Conceptual design to pilot training.

Recent advances in simulation technology have increased the emphasis on the use of simulation throughout a vehicle's life cycle. Simulation models are currently used to support design, operational analysis, test and evaluation, and training, but these models have been independently generated and are not subject to compliance with any standards. As a result the simulation models currently in use are inconsistent, difficult to maintain and upgrade, and vary greatly in their ability to support these applications.

This SBIR accomplished the rotorcraft simulation model standardization by focusing on rotorcraft conceptual design and the handling quality analysis process. ART's comprehensive rotorcraft modeling and simulation program, FLIGHTLAB, has been used to develop specialized blade element dynamic models to support rotorcraft both conceptual design and flying qualities evaluation.

The Phase I of this SBIR successfully accomplished the development of high fidelity rotorcraft simulation model for generating design database for rotorcraft conceptual design. The Phase II accomplishments include:

(1) Development of functional requirements for specialized rotorcraft dynamic models for use in handling qualities analysis;

(2) Development of a comprehensive plan for verification, validation, and accreditation (VV&A) of the rotorcraft handling qualities dynamic models;

(3) Development of blade element models in FLIGHTLAB for the three example helicopters for handling qualities applications.

(4) Performance of validation testing of the blade element models for performance, stability, and control response prediction against measured data to demonstrate the model VV&A process.

Advanced Rotorcraft Technology, Inc.

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