Disk Vibration Absorber With Adjustable Frequency and Direction
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Solution Overview
Problem
Existing tuned vibration absorbers (TVAs) are limited by fixed resonance frequencies and directions, which do not account for varying structural compliance and vibration directions across different locations, requiring multiple designs and mounting schemes, increasing complexity and cost.
Innovation Solution
A disk-shaped TVA with an adjustable frequency and direction, featuring a rotatable inner frame assembly with a bearing and directional guides, allowing for circumferentially varying elastomer stiffness and mass distribution to align with desired vibration frequencies and directions, enabling on-site tuning without electrical power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed resonance frequency TVAs are used, then the device structure is simple, but the device cannot adapt to varying structural compliance and vibration directions at different locations
Solution Approach 1:
The TVA incorporates a rotatable inner frame assembly that can be manually adjusted to different angular positions, transforming the fixed-frequency device into a dynamically adjustable one. This allows the TVA to adapt its resonance frequency and directional response to match varying structural compliance and vibration characteristics at different installation locations, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The invention enables parameter adjustment by rotating the inner frame assembly, which changes the effective stiffness distribution and mass distribution relative to the outer frame. This parameter change allows tuning of the resonance frequency without requiring multiple different TVA designs, thus improving adaptability while maintaining relatively simple device structure.
2Reliability
If multiple TVA designs are used to accommodate different locations, then the vibration absorption effectiveness is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The TVA is designed as a universal device that can be installed at multiple different locations on the aircraft structure. The rotatable inner frame assembly allows a single TVA design to perform multiple functions by adjusting to different vibration frequencies and directions, eliminating the need to manufacture multiple location-specific TVA variants, thus reducing manufacturing cost while maintaining vibration absorption effectiveness.
Solution Approach 2:
By making the TVA dynamically adjustable through manual rotation of the inner frame, a single design can adapt to different installation requirements, replacing the need for multiple fixed-design TVAs. This dynamic capability ensures reliable vibration absorption across various locations without increasing manufacturing complexity or cost.
3Ease of operation
If manual adjustment methods (spring tension, elastomer compression) are used, then the frequency tuning is achievable, but the adjustment process is complex and requires disassembly
Solution Approach 1:
The invention employs a simple rotational adjustment mechanism where the inner frame assembly can be manually rotated to different positions. This dynamic adjustment method is much simpler than compressing elastomers or adjusting spring tensions, as it requires no disassembly of the TVA from the structure and can be performed by simply rotating the assembly to the desired angular position, thereby improving ease of operation while maintaining low device complexity.
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
This solution allows a single TVA design to effectively absorb vibrations across a range of directions and frequencies, reducing complexity and cost by accommodating varying structural compliance and manufacturing tolerances, while providing adjustable frequency response.
Implementation Method 1
a bearing assembly inside the mass, wherein the bearing assembly is configured to enable rotation of the inner frame assembly within the outer frame
Implementation Method 2
an elastomeric material inside the inner frame; an adjustable frequency vibration reduction apparatus with a circumferentially varying stiffness
Implementation Method 3
at least one directional guide mechanically coupled to the bearing and the outer frame, wherein the outer frame is mounted to a structure, and rotation of the inner frame assembly is configured for adjusting a working frequency
Data Source
AI summary
Motorized aircraft and other mechanical constructs subject to a force vibrate at resonant frequencies, causing parts degradation, unpleasant sensations for occupants, unwanted noise, and other undesirable effects. Tuned vibration absorbers that mitigate these effects typically counteract vibrations at specific frequencies traveling in specific directions at specific locations within a given structure and are not adjustable. The present disclosure details a disk-shaped tuned vibration absorber that may be tuned on-the-spot within a structural mount such that the frequency at which the disk resonates may be varied and such that the working direction of the disk may be varied. The direction of vibration absorption of the disk may be altered by reconfiguring the disk within its mount, and the resonance of the disk may be altered by rotating an inner component of the disk. The inner component comprises a mass and an elastomer of circumferentially varying stiffness.