Computer Code for Interactive Rotorcraft Preliminary Design Using a Harmonic Balance Method for Rotor Trim

Abstract

The Joint Army/Navy Rotorcraft Analysis and Design (JANRAD) computer program was developed to aid in the analysis of helicopter rotor performance, stability and control, and rotor dynamics. JANRAD is an interactive, user friendly program, capable of accurately and quickly solving helicopter design problems at the preliminary design level. The program was written as a collection of MATLAB script and function files (M-files) using the 386-MATLAB version 3.5 programming language. The M-file janrad. in invokes the user interface routines and calls various analysis modules (M-files) which contain the appropriate analysis and output routines. Each of these modules use a common routine, trim.m, which employs blade element theory and a harmonic balance method for rotor trim. The program is limited to conditions of steady flight with no winds and is accurate at a hover and for forward airspeeds greater than or equal to 50 knots.

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Document Details

Document Type
Technical Report
Publication Date
Sep 23, 1993
Accession Number
ADA274924

Entities

People

  • Robert K. Nicholson Jr

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aeronautics
  • Aircraft Equipment
  • Aircraft Wings
  • Aircrafts
  • Airfoils
  • Airframes
  • Computer Programming
  • Computer Programs
  • Computers
  • Helicopter Rotors
  • Helicopters
  • Instructions
  • Mach Number
  • Operating Systems
  • Programming Languages
  • Rotary Wing Aircraft
  • United States

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Computer Science.
  • Database Systems and Applications