Application of a Notch Digital Filter to Elimination of Sinusoidal Disturbances from Helicopter Flight Data.

Abstract

Helicopter flight data, especially measurements of linear accelerations and angular velocities, are typically corrupted by sinusoidal deterministic disturbances, that are associated with the rotor frequency and its harmonics. In an effort to eliminate these disturbances without distorting the underlying trends, a new digital notch filter, developed under a research agreement between Aeronautical Research Laboratories and the University of Newcastle, has been modified and implemented on the ARL ELXSI 6400 computer. In this memo, the filter is described and the frequency and transient response characteristics are summarised. Practical considerations arising out of application of single and cascaded filters to Sea King flight data are discussed, and the performance of the new filter is compared with that of comparable Butterworth filters.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1986
Accession Number
ADA173845

Entities

People

  • R. A. Feik
  • R. H. Perrin

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aeronautical Engineering
  • Air Force
  • Aircraft Maintenance
  • Aircrafts
  • Computers
  • Data Analysis
  • Department Of Defense
  • Digital Filters
  • Distortion
  • Equations
  • Filters
  • Filtration
  • Frequency
  • Frequency Response
  • Notch Filters
  • Phase Shift
  • Power Spectra

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Aerospace Engineering
  • Radar Systems Engineering.