Helicopter Rotor Damper Elastomeric Torsional Vibration Control
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Solution Overview
Problem
Current helicopter rotor damper systems face challenges in effectively damping the motion of helicopter blades relative to the rotor, particularly in managing lead lag motion, which can lead to vibrations and instability.
Innovation Solution
A helicopter rotor damper system incorporating a torsional damper with elastomeric torsional dampers and a damper link, where the torsional dampers have elastomers bonded between nonelastomeric surfaces, and a damper link connected between the helicopter blade and rotor, allowing for rotational motion about a center of rotation axis, thereby damping the lead lag motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a torsional damper with elastomeric torsional dampers is used to damping lead lag motion, then vibration reduction and stability enhancement are achieved, but device complexity increases due to multiple bonded components and rotation mechanism
Solution Approach 1:
The torsional damper is divided into multiple elastomeric torsional dampers (first, second, third, and fourth dampers) arranged at different angular positions around the rotation axis. Each damper independently dampens vibrations in its specific direction, allowing the system to handle multi-directional lead lag motion more effectively while maintaining manageable complexity through modular segmentation.
Solution Approach 2:
The invention uses composite construction by bonding elastomeric materials to nonelastomeric surfaces, creating a hybrid structure that combines the vibration-damping properties of elastomers with the structural integrity of nonelastomeric materials. This composite approach enables effective vibration reduction while maintaining the mechanical strength required for rotor application.
2Object-affected harmful factors
If elastomeric torsional dampers with bonded surfaces are used, then damping effectiveness is improved, but manufacturing precision requirements increase due to bonding alignment
Solution Approach 1:
The segmentation of the damping system into multiple independent elastomeric torsional dampers allows each component to be manufactured and bonded separately with standardized interfaces. This modular approach reduces the cumulative precision requirements compared to a single complex bonded structure, as each damper unit can be assembled and tested independently before integration into the complete rotor damper system.
Solution Approach 2:
Each elastomeric torsional damper is designed with specific bonding surfaces optimized for its particular location and loading conditions. The bonding surfaces, elastomeric material properties, and geometric configurations are locally tailored to match the specific vibration characteristics and stress states at each position around the rotation axis, thereby reducing the need for extremely high global bonding precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively dampens the lead lag motion of helicopter blades, reducing vibrations and enhancing stability by utilizing elastomeric torsional dampers and a damper link to manage rotational motion, improving the overall performance of the helicopter rotor system.
Implementation Method 1
a first elastomeric torsional damper, the first elastomeric torsional damper having a first elastomeric torsional damper torsional elastomer bonded between a first elastomeric torsional damper first torsional damper nonelastomeric bonding surface and a first elastomeric torsional damper second torsional damper nonelastomeric bonding surface
Implementation Method 2
The system effectively dampens the lead lag motion of helicopter blades, reducing vibrations and enhancing stability by utilizing elastomeric torsional dampers
Implementation Method 3
a damper centering bearing providing a damper center of rotation axis
Data Source
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AI summary
A helicopter rotor damper system (20) including a torsional damper (26) with a damper centering bearing (28) providing a damper center of rotation axis (30), a first elastomeric torsional damper with a first elastomeric torsional damper torsional elastomer (34) bonded between a first elastomeric torsional damper first torsional damper nonelastomeric bonding surface (36) and a first elastomeric torsional damper second torsional damper nonelastomeric bonding surface (38), and a second elastomeric torsional damper with a second elastomeric torsional damper torsional elastomer (34) bonded between a second elastomeric torsional damper first torsional damper nonelastomeric bonding surface and a second elastomeric torsional damper second torsional damper nonelastomeric bonding surface. The helicopter rotor damper system includes a damper link (40) linked with the torsional damper, with the torsional damper and the damper link connected between a helicopter blade (22) and a helicopter rotor (24) with the elastomeric torsional damper nonelastomeric bonding surfaces relatively rotating.