A Comparison of Main Rotor Smoothing Adjustments Using Linear and Neural Network Algorithms

Abstract

Helicopter main rotor smoothing is a maintenance procedure that is routinely performed to minimize airframe vibrations induced by non-uniform mass and/or aerodynamic distributions in the main rotor system. This important task is both time consuming and expensive, so improvements to the process have long been sought. Traditionally, vibrations have been minimized by calculating adjustments based on an assumed linear relationship between adjustments and vibration response. In recent years, artificial neural networks have been trained to recognize non-linear mappings between adjustments and vibration response. This research was conducted in order observe the character of the adjustment mapping of the Vibration Management Enhancement Program's PC-Ground Base System (PC-GBS). Flight data from the UH-60, AH-64A, and AH-64D were utilized during the course of this study. What has been determined is that the neural networks of PC-GBS produce adjustments that can be reproduced by a linear algorithm, thus implying that the shape of the mapping is in fact linear.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2006
Accession Number
ADA446788

Entities

People

  • Nathan Miller

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aircraft Industry
  • Aircrafts
  • Airframes
  • Algorithms
  • Complex Numbers
  • Computer Programs
  • Computers
  • Data Acquisition
  • Databases
  • Engineering
  • Measurement
  • Neural Networks
  • Spreadsheet Software
  • Statistical Analysis
  • Training
  • User Interface

Readers

  • Aerospace Engineering
  • Neural Network Machine Learning.
  • Systems Analysis and Design

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference
  • AI & ML - Machine Learning Algorithms
  • AI & ML - Neural Networks