Spunbond Particle Damper Pouch for Full-Range Vehicle Panel Noise
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Solution Overview
Problem
Existing noise attenuation systems in vehicles are unable to effectively reduce low-frequency structure-borne noise while also being inefficient in mid-high frequency noise reduction, leading to increased complexity and cost in vehicle assembly.
Innovation Solution
A particle acoustic damper comprising a pouch made of a spunbond polyolefin fiber web filled with loose particles, which effectively transfers vibrational energy to the particles for dissipation, thereby reducing noise across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If two different types of parts (noise attenuating trim parts and vibration damping pads) are combined to achieve satisfactory noise attenuation over full frequency range, then noise reduction performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates multiple noise attenuation functions into a single multi-layered trim part structure, combining particle damping material with foam or fabric substrates, thereby eliminating the need for separate damping pads and trim parts while achieving full frequency range noise reduction
Solution Approach 2:
The composite trim part structure serves multiple noise attenuation functions simultaneously - low-frequency damping through particles, mid-high frequency absorption through porous materials, and structural insulation - replacing multiple specialized components with a single multi-functional part
2Object-affected harmful factors
If two different types of parts (noise attenuating trim parts and vibration damping pads) are combined to achieve satisfactory noise attenuation over full frequency range, then noise reduction performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple noise attenuation materials and functions into a single integrated trim part, reducing the total number of components that need to be manufactured, stored, and assembled, thereby lowering overall manufacturing costs despite using multiple material types
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 particle acoustic damper provides effective noise reduction at local hotspots, capable of replacing traditional damping pads with reduced weight and improved recyclability, while maintaining performance across the frequency range from 100 Hz to 10 KHz.
Implementation Method 1
the loose particles inside the pouch dissipate it, through friction and/or inelastic collisions
Implementation Method 2
the loose particles inside the pouch dissipate it, through friction and/or inelastic collisions
Implementation Method 3
a particle acoustic damper for locally damping vibration of vehicle panels and reducing noise radiated by them
Data Source
AI summary
A particle acoustic damper for locally damping vibration of a vehicle panels and reduce noise radiated by them comprising a pouch sealed to provide an enclosure and loose particles forming a filler inside the enclosure, characterised in that the pouch comprises of at least one layer of a spun bond fiber web