A Phase-Locked Frequency Multiplier for the Signal Averaging of the Vibration of the Wessex Helicopter Input Spiral Bevel Pinion.

Abstract

This Australian report provides details of the design of a phase-locked frequency multiplier for the conversion of a signal derived from the alternator of the Wessex helicopter into a pulse train suitable for controlling the sampling and signal averaging by a computer of the vibration of the input spiral bevel pinion in the Wessex main rotor gearbox. The frequency multiplier is implemented as a series of four phase-locked loops, and features an oscillator which maintains the loops at approximately the correct frequency in standby mode thereby reducing the time to lock when the input signal is applied. Keywords: Gearboxes; Signal averaging; Condition monitoring.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1985
Accession Number
ADA154914

Entities

People

  • P. D. Mcfadden

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircraft Maintenance
  • Aircrafts
  • Circuits
  • Conversion
  • Detectors
  • Diagrams
  • Frequency
  • Frequency Multipliers
  • Helicopters
  • Impedance
  • Leading Edges
  • Materials Laboratories
  • Oscillators
  • Phase Detectors
  • Power Supplies
  • Vibration

Fields of Study

  • Engineering

Readers

  • Control Systems Engineering.
  • Electrical Engineering
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).