Aircraft Crew Seat Active Vibration Control With Fluid-Cavity Actuation
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Solution Overview
Problem
Aircraft vibrations generated by propellers and rotors cause fatigue and decreased performance in occupants due to complex vibration profiles, affecting mental and physical well-being and aviation safety.
Innovation Solution
A vibration canceling system with a cavity filled with incompressible fluid and a force generator controlled by a sensor and controller to move the occupant-facing surface out of phase with the sensed motion, using a vibration canceling structure with the sensed motion, a vibration-canceling structure with a cavity filled with incompressible fluid and a force generator controlled by a sensor and controller to move the occupant-facing surface out of phase with the sensed motion, effectively canceling vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional vibration isolation methods are used, then some vibration reduction is achieved, but the complexity of the system increases and effectiveness is limited
Solution Approach 1:
The patent extracts the harmful vibration frequencies from the complex vibration profile by using sensors to detect specific frequency components and then applying canceling forces only at those frequencies, rather than attempting to cancel the entire complex vibration spectrum. This selective approach reduces system complexity while maintaining effectiveness.
Solution Approach 2:
The invention applies different canceling strategies to different frequency components of the vibration spectrum. Each frequency component is treated with localized quality control, using specific canceling forces tailored to that frequency's characteristics, rather than applying a uniform approach to all vibrations.
2Object-affected harmful factors
If active vibration cancellation is applied across the entire vibration spectrum, then comprehensive vibration reduction is achieved, but the energy consumption and system complexity increase significantly
Solution Approach 1:
The patent applies partial action by targeting only the harmful frequency components of the vibration spectrum for cancellation, rather than applying energy-intensive cancellation across the entire spectrum. This selective partial action reduces energy consumption while still achieving comprehensive protection against harmful vibrations.
Solution Approach 2:
The system uses sensors to continuously monitor the vibration profile and provides feedback to the control system, which then adjusts the canceling forces in real-time. This feedback mechanism allows the system to energy-efficiently target only the currently harmful frequency components rather than continuously applying full-spectrum cancellation.
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 cancels vibrations at the occupant-facing surface, reducing fatigue and improving performance by providing precise and instantaneous vibration cancellation, enhancing aviation safety and operational efficiency.
Implementation Method 1
The cavity contains a substantially incompressible fluid
Implementation Method 2
The sensor is configured to sense a motion of the first surface
Implementation Method 3
a force generator configured to transmit forces to the substantially incompressible fluid to move the first surface relative to the second surface
Data Source
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AI summary
A vibration canceling system for an aircraft includes a vibration canceling structure having a first surface opposite a second surface and a cavity between the first surface and the second surface. The cavity contains a substantially incompressible fluid. The system includes a force generator configured to transmit forces to the substantially incompressible fluid to move the first surface relative to the second surface and a sensor positioned at the first surface. The sensor is configured to sense a motion of the first surface. The system includes a controller configured to control the force generator to transmit a first force to the substantially incompressible fluid to move the first surface out of phase with the sensed motion.