Weighted Lever Arm Vibration Filter for Aircraft Equipment
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Solution Overview
Problem
Aircraft equipment is subjected to severe high-frequency vibrations during flight, which are not effectively filtered by existing suspension systems, leading to discomfort for passengers and potential equipment malfunction, and existing solutions are either inadequate or overly complex and expensive.
Innovation Solution
A vibration filtering mechanism using weighted lever arms with deformable means is interposed between the aircraft fuselage and equipment, allowing relative movement and amplifying forces to absorb and filter vibrations, effectively reducing transmission of high-frequency vibrations across various orientations without increasing equipment size or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing suspension means are used to damp large amplitude movements, then comfort for large movements is improved, but filtering of low-amplitude high-frequency vibration is insufficient
Solution Approach 1:
The suspension system is segmented into two distinct functional components: conventional suspension means for handling large amplitude movements and a filter mechanism with deformable means for filtering low-amplitude high-frequency vibrations. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The filter mechanism acts as an intermediary element inserted between the seat and the aircraft floor. This intermediary component specifically targets and filters high-frequency vibrations while allowing the conventional suspension to continue handling large amplitude movements, thus resolving the contradiction without increasing overall system complexity.
2Object-affected harmful factors
If deformable means are used to absorb vibration through elasticity, then vibration filtering is improved, but the solution is not completely satisfactory for varying equipment weights
Solution Approach 1:
The filter mechanism incorporates a dynamic structure with a lever arm that can pivot and adjust its configuration based on the equipment weight. The deformable means are positioned to work in conjunction with the lever arm, allowing the system to adapt its mechanical advantage and filtering characteristics according to the actual load, thus maintaining effectiveness across varying weights.
3Object-affected harmful factors
If a mechanism with weighted lever arm and deformable means is used, then vibration filtering is effective, but device complexity and cost increase
Solution Approach 1:
The filter mechanism is designed with multi-functionality: the lever arm serves both as a structural support element and as a vibration amplification element, while the deformable means simultaneously provide structural flexibility and vibration filtering. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity despite the enhanced filtering capability.
4Object-affected harmful factors
If filter mechanism is interposed between fuselage and equipment, then vibration transmission is reduced, but relative movement capability is constrained
Solution Approach 1:
The deformable means in the filter mechanism are designed with specific mechanical properties that allow them to change their effective stiffness parameter based on the type of movement. For high-frequency vibrations, they provide strong resistance, while for low-frequency relative movements, they maintain sufficient flexibility. This parameter change capability allows the system to simultaneously achieve vibration filtering and preserve relative movement capability.
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 mechanism provides effective filtering of vibrations in pitching, sliding, and rolling movements while maintaining compactness and simplicity, ensuring equipment protection without hindering movement or increasing size, making it suitable for various aircraft equipment like seats.
Implementation Method 1
use is made of the elasticity of the deformable means to absorb relative movements at high frequency and of low amplitude between the fuselage and the equipment
Implementation Method 2
a mechanism that associates a weighted lever with deformable means that oppose transmission of the forces generated by the vibration towards the equipment
Data Source
AI summary
The invention provides a vibration filter mechanism for aircraft equipment. A weighted lever arm (5) is hinged via bearings (22, 23) associated respectively with a first structure connected to a fuselage and with a second structure connected to the equipment (12). Deformable means (7) oppose pivoting movement of the lever arm. The lever arm (5) is arranged as a one-piece fork that comprises a pair of branches (19, 20) that are interconnected by a crossbar (21) and that are hinged to the bearings (22, 23) about spaced-apart parallel pivot axes (A1, A2). The fork carries a torsion shaft (24) that extends between the branches (19, 20) at their free ends (9), the torsion shaft (24) constituting the weight weighting the lever arm (5) and the deformable means (7) of the mechanism.