Modeling and Analysis of Helicopter Ground Resonance Utilizing Symbolic Processing and Dynamic Simulation Software

reportActive / Technical Report | Accession Number: ADA331773 | Open PDF

Abstract:

This thesis develops a technique for formulating the full nonlinear equations of motion for a coupled rotor-fuselage system utilizing the symbolic processing software MAPLEregistered. The symbolic software is further utilized to automatically convert the equations of motion into C, Fortran or MATLABregistered source code formatted specifically for numerical integration. The compiled source code can be accessed and numerically integrated by the dynamic simulation software SIMULINKregistered. SIMULINKregistered is utilized to generate time history plots of blade and fuselage motion. These time traces can be used to explore the effects of damping nonlinearities, structural nonlinearities, active control, individual blade control, and damper failure on ground resonance. In addition, a MATLABregistered program was developed to apply the Moving Block Technique for determining modal damping of the rotor-fuselage system from the time marching solutions.

Author(s):
Robinson, Christopher S.
Author Organization(s):
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Descriptive Note:
Master's thesis
Pagination:
0137

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
NPS
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.1.1_Establish and Maintain Unity of Effort with Mission Partners; JCA_5.1_Organize; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_6.3.3_Spectrum Management; JCA_1.4.2_Health Service Delivery; JCA_1.4_Force Support; JCA_6_Net Centric; JCA_1_Force Support; JCA_6.3_Net Management; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_1.2.5_Lessons Learned; JCA_1.2_Force Preparation; JCA_8_Building Partnerships
Modernization Areas:
Fully Networked C3
Communities of Interest:
Air Platforms
Descriptor(s):
*ROTOR BLADES(ROTARY WINGS), *HELICOPTERS, COMPUTERIZED SIMULATION, SOFTWARE ENGINEERING, EQUATIONS OF MOTION, AERODYNAMIC STABILITY, STRUCTURAL MECHANICS, DAMPING, THESES, NONLINEAR SYSTEMS, NUMERICAL INTEGRATION, FUSELAGES, AIRCRAFT MODELS, SYMBOLIC PROGRAMMING
Field(s)/Group(s):
Helicopters, Aerodynamics
Keyword(s):
GROUND RESONANCE, MECHANICAL INSTABILITIES
Report Date:
1997 Mar 01
Creation Date:
1997 Dec 03