Helicopter Hub Vibration Control via Circular Force Generation
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Solution Overview
Problem
Existing vibration control systems for aircraft with rotating components, such as helicopter rotors, face challenges in effectively minimizing vibrations between the nonrotating body and rotating hub, leading to increased noise and structural stress.
Innovation Solution
A vibration control system that includes a rotating hub-mounted vibration control system, nonrotating body sensors, and circular force generators connected via a distributed data communications network, allowing for the generation of controlled rotating forces with adjustable magnitude and phase to counteract sensed vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration control system is implemented with sensors and force generators, then vibration reduction is achieved, but device complexity increases
Solution Approach 1:
The vibration control system is divided into separate functional modules: hub-mounted vibration control system, nonrotating body force generators, sensors, and communication network. Each module operates independently but coordinates through the network, allowing modular implementation and maintenance while achieving comprehensive vibration control.
Solution Approach 2:
A distributed force generation data communication network serves as an intermediary between the hub-mounted vibration control system and the nonrotating body force generators. This network enables coordinated vibration control by transmitting control data and sensor information without requiring direct mechanical coupling, thus reducing overall system complexity.
2Measurement precision
If multiple sensors and force generators are distributed throughout the aircraft, then measurement precision and control effectiveness improve, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The distributed force generators are designed with universal mounting interfaces and standardized control protocols, allowing the same hardware design to be installed at multiple locations throughout the aircraft. The communication network uses standardized data formats that work across all sensor and actuator types, simplifying manufacturing and assembly while maintaining high measurement precision through multiple distributed sensing points.
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 significantly reduces vibrations sensed by nonrotating body sensors, enhancing structural stability and reducing noise, by generating controlled rotating forces that align with the rotational dynamics of the aircraft components.
Implementation Method 1
at least a first nonrotating body circular force generator, the at least a first nonrotating body circular force generator fixedly coupled with the nonrotating body
Implementation Method 2
a rotating hub mounted vibration control system, the rotating hub mounted vibration control system mounted to the rotating rotary wing hub with the rotating hub mounted vibration control system rotating with the rotating rotary wing hub
Data Source
AI summary
A rotary wing aircraft including a vehicle vibration control system. The vehicle vibration control system includes a rotating hub mounted vibration control system, the rotating hub mounted vibration control system mounted to the rotating rotary wing hub with the rotating hub mounted vibration control system rotating with the rotating rotary wing hub driven to rotate about a rotating hub center Z axis by a gear box transmission. The vehicle vibration control system includes a rotary wing aircraft member sensor for outputting rotary wing aircraft member data correlating to the relative rotation of the rotating rotary wing hub member rotating about the rotating hub center Z axis relative to the nonrotating body, a first nonrotating body vibration sensor outputting first nonrotating body vibration sensor data correlating to vibrations.