Aircraft Resonator Anti-Resonance Vibration Absorption
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Solution Overview
Problem
Existing resonators for aircraft, particularly rotorcraft, face challenges in efficiently absorbing vibrations due to issues with translational guidance of seismic masses, leading to premature wear and friction problems, and are difficult to arrange in cramped spaces with limited adjustment capabilities.
Innovation Solution
A resonator design featuring a heavy member with a casing and an elastic blade, utilizing a worm screw and sliding nut mechanism for translational movement, along with pressure means using split rings and elastic members to guide the mass assembly without play, allowing for efficient vibration absorption and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the translation guidance of the seismic mass is done with assembly clearance, then the resonator can accommodate movements, but the resonator can deteriorate rapidly due to wear
Solution Approach 1:
The patent introduces an intermediary mechanism (the guidance system with controlled clearances and damping elements) between the seismic mass and the casing to mediate the interaction. This intermediary allows movement accommodation while distributing wear and reducing direct contact damage, thereby resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating damping elements and carefully designed clearances that absorb shocks and reduce impact forces before they can cause damage to the resonator components. This preemptive cushioning protects the system while allowing necessary movements.
2Reliability
If the translational guidance of the seismic mass is done with no assembly play, then wear is reduced, but the resonator may prove to be unusable because of friction
Solution Approach 1:
The patent applies parameter changes by carefully controlling the magnitude of assembly clearances and the properties of damping elements. By optimizing these parameters, the system achieves minimal friction while maintaining necessary mobility, resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The damping elements act as intermediaries that reduce friction between the seismic mass and guidance structures while allowing controlled movement. This intermediary mechanism enables the system to maintain both low friction and necessary mobility.
3Strength
If three columns are used to guide the mobile mass, then structural support is provided, but the arrangement becomes hyperstatic and clearances are difficult to control
Solution Approach 1:
The patent extracts the hyperstatic constraint by using a reduced number of guidance columns (two instead of three), thereby eliminating the complexity of controlling clearances in a hyperstatic system while maintaining sufficient structural support through alternative design features.
Solution Approach 2:
The patent changes the structural configuration parameters by reducing the number of columns and adjusting the placement and properties of remaining support elements. This parameter change simplifies the guidance system while maintaining adequate structural support.
4Volume of stationary object
If a resonator is arranged in a space cluttered with various organs, then space utilization is achieved, but the arrangement of the seismic mass becomes difficult
Solution Approach 1:
The patent applies the nested doll principle by integrating the seismic mass and its guidance mechanisms within a compact casing that can be nested within the available space among other aircraft organs. This nesting approach maximizes space utilization while keeping the internal arrangement manageable.
Solution Approach 2:
The patent utilizes another dimension by arranging components in three-dimensional space efficiently, allowing the seismic mass to be positioned and guided in ways that optimize the use of available volume while simplifying the arrangement complexity through spatial optimization.
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 resonator effectively absorbs strong vertical accelerations and vibrations, preventing damage to parts and reducing friction, while allowing for simple and efficient adjustment and maintenance, optimizing the bulk and weight distribution within the aircraft.
Implementation Method 1
A resonator conventionally comprises a member referred to as a 'seismic mass' or 'beating mass' connected to a support by a means of mobility, such as an elastic blade
Implementation Method 2
A resonator produces an anti-resonance effect at a predetermined frequency called the 'anti-resonance frequency'
Implementation Method 3
the resonator comprising a worm screw engaged in a sliding nut of the mass assembly
Implementation Method 4
each pressure means comprising at least one elastic disposed in said groove and a split ring pressed against said inner face by said at least one elastic member of the pressure means
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
The present invention relates to a resonator equipped with a weight (20) comprising a housing (25) attached to an elastic blade. The weight (20) comprises a mass assembly (40) which is free to translate within said housing (25) along a longitudinal direction (D1). A worm gear (80) driven by a drive means (90) is engaged in a sliding nut of said mass assembly (40). The mass assembly (40) comprises two masses (50) sliding respectively in two cylindrical spaces (31) of the housing. Each mass (50) has at least two pressure means (60) interposed between this mass (50) and the housing, each pressure means (60) comprising a groove formed in a circumference of a mass (50), each pressure means (60) comprising at least one elastic element disposed in said groove and a split ring pressed against the housing by said at least one elastic element of the pressure means (60).