Headrest Lattice Matrix with Tunable Mass Damper
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Solution Overview
Problem
Existing headrest assemblies fail to effectively mitigate vibrations, particularly in vehicle seating, due to inadequate damping mechanisms.
Innovation Solution
A headrest assembly incorporating a lattice matrix with a stiffness gradient and a removable insert within a receptacle, where the lattice matrix is integrated with an attachment bracket and receptacle to form a monolithic structure, providing a dynamic mass damper effect by absorbing vibrations through the deflectable nature of the lattice matrix and the insert's weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional solid support structure is used in the headrest, then structural strength is maintained, but vibration damping effectiveness deteriorates
Solution Approach 1:
The patent employs a lattice matrix structure with interconnected struts forming a porous framework. This lattice structure provides both mechanical strength through its geometric configuration and vibration damping through the controlled porosity, allowing energy dissipation while maintaining structural integrity. The porous architecture enables the support member to deform in a controlled manner to absorb vibrations.
Solution Approach 2:
The support member combines the lattice matrix structure with a removable insert material to create a composite system. The lattice framework provides structural strength and geometric stability, while the insert material (such as foam or gel) provides additional vibration absorption and comfort. This composite approach allows optimization of both strength and damping characteristics.
2Adaptability or versatility
If a fixed damping structure is used in the headrest, then manufacturing simplicity is maintained, but adaptability to different vibration frequencies deteriorates
Solution Approach 1:
The patent incorporates a removable insert that can be exchanged to adjust the damping characteristics of the support member. By replacing the insert with different materials or configurations, the resonant frequency and damping properties can be tuned to match different vibration profiles. This dynamic adjustability allows the same lattice framework to serve multiple vibration mitigation purposes.
Solution Approach 2:
The support member's damping parameters can be modified by changing the insert material properties (density, viscosity, elasticity) or the lattice matrix geometry (strut thickness, cell size, connectivity). These parameter adjustments enable optimization of the damping performance for specific vibration frequencies without redesigning the entire structure.
3Ease of repair
If a monolithic lattice structure is used, then manufacturing precision is improved, but ease of repair and adjustment deteriorates
Solution Approach 1:
The support member is divided into distinct segments: the lattice matrix framework and the removable insert. This segmentation allows the insert to be independently replaced or adjusted without affecting the lattice structure. The lattice matrix itself is integrated with the headrest bun and support armature, providing structural stability, while the separable insert enables easy maintenance and customization.
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 solution effectively absorbs vibrations, providing a comfortable and stable headrest experience by tuning the resonators to specific frequencies, reducing movement and enhancing the overall damping effect within the headrest assembly.
Implementation Method 1
providing a dynamic mass damper effect by absorbing vibrations through the deflectable nature of the lattice matrix
Implementation Method 2
tuning the resonators to specific frequencies
Implementation Method 3
providing a dynamic mass damper effect by absorbing vibrations through the deflectable nature of the lattice matrix and the insert's weight
Data Source
AI summary
A headrest assembly includes a headrest bun having an interior portion. A support armature includes a portion thereof disposed within the interior portion of the headrest bun. A support member includes a lattice matrix comprised of a plurality of interconnected links. The support member is supported within the interior portion of the headrest bun by the support armature. A receptacle is operably coupled to the lattice matrix of the support member within the interior portion of the headrest bun and includes an interior cavity. A weighted insert is removeably received within the interior cavity of the receptacle.