Vehicle Seat Backrest Tuned Mass Damper With Adjustable Frequency
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Solution Overview
Problem
Vehicle seats with increased mass in the backrest, due to integrated equipment, experience reduced natural frequency leading to intense vibrations and annoying noises, as existing vibration absorbers are typically configured for a single frequency range, failing to optimally adapt to varying seat configurations.
Innovation Solution
A vehicle seat with a multi-stage coupling arrangement in the vibration absorber, allowing the distance between the backrest inclination axis and the absorber mass element to be adjusted, enabling optimal adaptation of damping frequency to the seat's configuration, including equipment like unfoldable tables or monitors, and facilitating easy repositioning for retrofitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backrest mass is increased by integrating equipment (seat belt, work table, monitor), then the seat provides more comfort functions, but the natural frequency of the seat is reduced causing intense vibrations and annoying noises
Solution Approach 1:
The patent adjusts the distance parameter between the backrest inclination axis and the absorber mass element to change the damping frequency. By varying this distance, the vibration absorber can be tuned to different frequency ranges to counteract vibrations caused by different backrest mass configurations and equipment integrations.
2Object-affected harmful factors
If a vibration absorber is provided in the backrest, then vibrations are reduced, but the absorber is typically configured for one frequency range which constitutes a compromise and cannot adapt to varying seat configurations
Solution Approach 1:
The patent makes the vibration absorber adjustable by providing a multi-stage coupling arrangement that allows the distance between the backrest inclination axis and the absorber mass element to be varied. This enables the damping frequency to be dynamically adapted to different seat configurations and equipment arrangements.
Solution Approach 2:
The coupling arrangement is divided into multiple stages with first and second couplers that can be connected at different positions. This segmentation allows the absorber mass element to be positioned at multiple discrete locations along the holding element, providing frequency adaptation without requiring a completely different absorber design.
3Device complexity
If the absorber mass element is fixed in position, then the structure is simple, but the damping frequency cannot be adapted to different vehicle seat configurations or retrofitted with accessories
Solution Approach 1:
The patent introduces adjustability into the otherwise simple structure by providing a holding element with multiple coupling positions. The elastic holding element maintains structural simplicity while the multi-stage coupling arrangement enables frequency adaptation through repositioning the absorber mass element at different distances from the backrest inclination axis.
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 for tailored vibration damping, ensuring optimal comfort and adaptability to changing seat configurations, reducing manufacturing costs and simplifying access for retrospective adjustments, while maintaining effective vibration absorption without a housing.
Implementation Method 1
the vibration absorber has at least one holding element which is connected to the backrest structure of the backrest and is elastic at least in regions
Implementation Method 2
the natural frequency of the seat is reduced, which leads in the driving mode to vibration of the seat, in particular the backrest
Implementation Method 3
vibration absorbers which are provided in the vehicle seat, in particular in the backrest
Data Source
AI summary
A vehicle seat has a tuned mass damper, wherein the vehicle seat has a seat bottom element, which is or can be connected to a vehicle structure, and a seat back that can be tilted on the seat bottom element about a backrest tilt axis. The seat back has a tuned mass damper that is coupled to a backrest structure of the seat back and integrated into the seat back, wherein the tuned mass damper has at least one retaining element that is connected to the backrest structure of the seat back, is elastic at least in some regions and has a first coupler that can be coupled to a second coupler provided on a damper mass element, wherein the first coupler and the second coupler form a multi-stage coupling assembly, by which the distance between the backrest tilt axis and the damper mass element can be varied.