INVESTIGATION OF ELASTIC COUPLING PHENOMENA OF HIGH SPEED RIGID ROTOR SYSTEMS

reportActive / Technical Report | Accession Number: AD0604030 | Open PDF

Abstract:

The report describes an investigation of the effects of variations in design parameters on the dynamic characteristics of cantilever blade or rigid rotors. Some fundamental concepts of rigid rotor dynamics including decoupling are presented, as well as a 10-degree-of-freedom rotor stability analysis in hovering and a brief study of the static stability of the model. A dynamic helicopter wind tunnel model having a 10-foot rotor diameter was constructed with three sets of blades and a hub which allowed many variations in geometry and stiffness. Seven rotor configurations were tested. The model and rotors and the testing technique are described, and all the data collected are included. A principal focus of the program was the decoupled, or matched blade, type of rigid rotor. It was demonstrated to simulated air speeds on the order of 240 miles per hour that this type of rotor is stable with extremely small values of control gyro inertia. In addition, it was found that blade matching has a major influence on chordwise oscillating blade loads.

Author(s):
Yeates, John E.
Author Organization(s):
LOCKHEED-CALIFORNIA CO BURBANK
Descriptive Note:
Rept. for Apr 1962-Jun 1963
Supplementary Note:
DOI: 10.21236/AD0604030
Pagination:
0303

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release, Document Partially Illegible
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited. Document Partially Illegible.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
LR-17013
Contract/Grant Number(s):
DA-44-177-TC-828
Task Number(s):
1D121401A14302
Monitor Series:
TRECOM
 Subject Terms
Joint Capability Areas:
JCA_3_Force Application; JCA_3.1.1_Maneuver to Engage; JCA_3.1_Maneuver; JCA_5_Command and Control; JCA_5.3_Planning; JCA_3.2_Engagement; JCA_3.2.1_Kinetic Means; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_5.2.3_Share Knowledge and Situational Awareness; JCA_5.2_Understand; JCA_1.2.3_Educating; JCA_1.2.6_Concepts; JCA_5.5.2_Task; JCA_5.5_Direct; JCA_6.1.1_Wired Transmission; JCA_8_Building Partnerships
Modernization Areas:
Directed Energy; Fully Networked C3
Communities of Interest:
Air Platforms
Descriptor(s):
*HELICOPTER ROTORS, *ROTOR BLADES, AERODYNAMIC LOADING, BLADE AIRFOILS, CONTROL SYSTEMS, COUPLINGS, DYNAMICS, ELASTIC PROPERTIES, HOVERING, OSCILLATION, ROTARY WINGS, STABILITY, WIND TUNNEL MODELS
Field(s)/Group(s):
Helicopters
Report Date:
1964 Jun 01