The Evaluation of a Stall-Flutter Spring-Damper Pushrod in the Rotating Control System of a CH-54B Helicopter

Abstract

The report describes a program conducted to evaluate the effect of rotating control system damping on stall-induced control loads and on aircraft handling qualities in stall. Such damping was introduced in the CH-54B control system by replacing the standard pushrods by a spring-damper assembly. The CH- 54B helicopter was chosen as the test vehicle because it exhibits stall-induced loads. Dynamic analyses defined pushrod stiffness and damping characteristics required to reduce the high-frequency torsional response of the main rotor blades. Spring-damper pushrods exhibiting the desired characteristics were designed, fabricated, and laboratory tested to assure that design requirements were met. The spring-damper pushrods were installed on a test rotor head and tested on the Sikorsky main rotor whirl tower.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1973
Accession Number
AD0771962

Entities

People

  • David O. Adams

Organizations

  • United Technologies Corporation

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Aircrafts
  • Assembly
  • Control Systems
  • Deflection
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Geometry
  • Helicopter Rotors
  • Manufacturing
  • Mechanics
  • Production
  • Standards
  • Stress Concentration
  • Stresses
  • Test And Evaluation
  • United States

Fields of Study

  • Physics

Readers

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