Vibroacoustic Plate With Shape Memory Cells for Multi-Frequency Damping
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Solution Overview
Problem
Existing vibroacoustic materials for air vehicles are inefficient in damping multiple frequencies and often require complex structures, are not cost-effective, and lack durability and lightness.
Innovation Solution
A vibroacoustic structure system comprising a plate with regularly structured unit cells and irregularly structured intermediate cells made of shape memory alloy, connected via additive manufacturing, which adapts to different frequencies through actuation by a sensor and control unit, allowing simultaneous damping of vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vibroacoustic materials are used to dampen vibrations, then vibration damping is achieved, but the structure becomes heavy and complex
Solution Approach 1:
The plate is divided into multiple unit cells with different geometries (circular, square, triangular, hexagonal) that are distributed across the structure. Each unit cell type targets specific frequency ranges, allowing the system to dampen multiple frequencies simultaneously without requiring a single heavy complex structure
Solution Approach 2:
The plate combines different materials with distinct properties: shape memory alloy for intermediate cells (providing flexibility and adaptability), polymer material for unit cells (providing structural stability), and aluminum alloy for the base plate (providing lightness and strength). This composite approach achieves effective vibration damping while maintaining light weight
2Adaptability or versatility
If complex vibroacoustic structures are designed to dampen multiple frequencies, then vibration damping coverage is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The plate structure serves multiple functions simultaneously: it provides structural support for the air vehicle, acts as a vibration damping system across multiple frequency ranges, and enables adaptive response to different vibration conditions. The same plate structure with its array of unit cells handles all these functions without requiring separate dedicated components for each function
Solution Approach 2:
The intermediate cells made of shape memory alloy can dynamically change their shape and stiffness in response to applied stress or temperature changes. This dynamic capability allows the structure to adapt its damping characteristics to match different vibration frequencies and intensities in real-time, enhancing versatility without increasing static structural complexity
3Adaptability or versatility
If shape memory alloy is used in all cells, then adaptability to different frequencies is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The shape memory alloy is selectively applied only to the intermediate cells that require adaptability for frequency tuning, while the unit cells are made from simpler polymer materials. This localized use of expensive and complex materials optimizes performance where needed while maintaining ease of manufacture and cost-effectiveness in other areas
Solution Approach 2:
The shape memory alloy intermediate cells can change their physical parameters (shape, stiffness, volume) in response to environmental conditions or applied fields. This parameter change capability allows a single structural element to provide multiple damping frequencies, reducing the need for numerous different cell types and simplifying the overall manufacturing process
4Reliability
If intermediate cells are made flexible for deformation, then vibration damping effectiveness is improved, but structural strength and durability may decrease
Solution Approach 1:
The plate combines shape memory alloy intermediate cells (flexible and adaptive) with polymer unit cells and aluminum alloy base structure (strong and durable). The composite construction allows the flexible intermediate cells to dampen vibrations while the stronger surrounding structures provide overall structural integrity and prevent failure
Solution Approach 2:
The plate is segmented into multiple independent unit cells distributed across the structure. This segmentation allows localized deformation of individual intermediate cells during vibration damping without compromising the overall structural strength, as the load is distributed across many cells and the rigid unit cells provide structural support
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 dampens vibrations at multiple frequencies by deforming intermediate cells, ensuring durability and lightness while preventing separation, thus providing efficient and cost-effective acoustic vibration damping.
Implementation Method 1
at least one intermediate cell (5) located on the plate (4) and between the unit cells (3), containing shape memory alloy material
Implementation Method 2
an actuator (6) located on the body (2), which energizes the intermediate cells (5), thereby enabling the intermediate cells (5) to change shape and/or form
Implementation Method 3
the plate (4) having a first position (I) in which at least two unit cells (3) move away from each other due to the intermediate cells (5) changing shape and/or form... thereby allowing that vibrations at multiple types of frequencies reaching thereon simultaneously are absorbed
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a body (2) in an air vehicle, which is subjected to vibration; a plurality of unit cells (3) located on the body (2); a plate (4) which is located on the body (2) and has a plurality of unit cells (3); at least one vibration source (V) which creates vibration on the body (2); unit cells (3) that almost completely absorb the vibration created on the body (2); unit cells (3) located on the plate (4) with an almost completely fixed form.