Accession Number:

ADA390276

Title:

Numerically Efficient Rotorcraft Trim and Transient Response

Descriptive Note:

Final rept. 1 Feb-30 Aug 1996, Phase 1

Corporate Author:

ADVANCED ROTORCRAFT TECHNOLOGY INC MOUNTAIN VIEW CA

Personal Author(s):

Report Date:

1996-08-29

Pagination or Media Count:

23.0

Abstract:

Comprehensive rotorcraft analysis systems are valuable tools in the design and analysis of rotorcraft. To make rotorcraft analyses a more practical tool for routine use, the long runtimes of analyses must be reduced. A central computational issue is the problem of solving for the rotorcraft trim and transient response. As a result of this limitation in the analysis of systems with a large number of degrees of freedom, the goal of this phase I effort is to develop a prototype for numerical algorithms for efficient trim and transient response. The effort includes three steps to reduce the runtime 1 Using the periodicity of a multibladed rotor to develop an identical blade algorithm to reduce the number of trim calculations 2 Creating a reformulated element for 2GCHAS to allow efficient modal reduction and the use of the identical blade algorithm and 3 Utilizing modal reduction to reduce the order of the model, thus reducing the runtime of the trim and transient response calculations. Algorithms for these steps have been successfully developed and enable systems such as 2GCHAS to perform analyses more efficiently. This efficient trim and transient response analysis broadens the scope of rotorcraft problems that can be analyzed in a reasonable amount of time.

Subject Categories:

  • Aerodynamics
  • Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE