A New Helicopter Transmission Model for Condition-Based Maintenance Technologies Using First Principles

This report presents a new helicopter transmission model in support of condition-based maintenance (CBM) initiatives. The model uses the first principles approach to analyze the rotating shafts and gear couplings using rotor dynamic analysis techniques. The helicopter transmission is presented, foll...

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Bibliographic Details
Main Authors: Stringer, David B, Sheth, Pradip N, Allaire, Paul E
Format: Report
Language:English
Subjects:
AIRCRAFT MAINTENANCE
AIRCRAFT MODELS
CBM(CONDITION BASED MAINTENANCE)
FINITE ELEMENT ANALYSIS
FREQUENCY DOMAIN
GEAR TEETH
Helicopters
Machinery and Tools
MATHEMATICAL MODELS
METHODOLOGY
SHAFTS(MACHINE ELEMENTS)
SILICON CARBIDES
Terminal Flight Facilities
TRANSMISSIONS(MECHANICAL)
VIBRATION
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Summary:This report presents a new helicopter transmission model in support of condition-based maintenance (CBM) initiatives. The model uses the first principles approach to analyze the rotating shafts and gear couplings using rotor dynamic analysis techniques. The helicopter transmission is presented, followed by a discussion of the finite element formulation to include gear mesh modeling methodologies. System natural frequencies and mode shapes are discussed, along with the model's validation procedure. The model's primary purpose is to simulate multiple operating conditions to include faults. One such fault condition simulates the wear of gear tooth contact surfaces. The nature of the fault and its modeling techniques are discussed. Simulation results are presented in the time domain using a conventional vibration diagnostic parameter. A new diagnostic parameter, the FE2, is also introduced for detecting faults in the frequency domain. Additional considerations and further research points are also discussed. The results demonstrate the potential of physics-based, mathematical models in providing a key technology enabler for improving health monitoring and prediction capabilities of CBM strategies. The original document contains color images. Prepared in collaboration with Virginia Univ., Charlottesville, VA.