Acoustic Vehicle Component Using Foam Particles for Faster Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing acoustically effective components for motor vehicles face challenges in production efficiency and acoustic performance due to time-consuming and costly methods for producing complex-shaped foam blocks, as well as the acoustically disadvantageous effect of closed plastic covers.
Innovation Solution
The use of a component with a bag formed from at least one plastic film, containing a filling of open-cell and/or mixed-cell foam particles, where the filling is a mixture of non-viscoelastic and viscoelastic foam particles, improving acoustic properties and simplifying assembly by allowing compression and re-expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If three-dimensionally shaped foam blocks are produced using moulded foams, then complex shapes can be achieved, but production cycle time increases to 120 seconds or more
Solution Approach 1:
The foam block is segmented into numerous individual foam particles that are filled into the bag, replacing the monolithic moulded foam structure. This segmentation allows rapid filling without lengthy moulding cycles while achieving complex final shapes through the flexible bag containment.
Solution Approach 2:
The invention changes the physical state and form of the foam material from solid moulded blocks to loose particles, and changes the containment from rigid moulds to flexible bags. This parameter change enables rapid production while maintaining complex geometries through the bag's flexibility rather than mould constraints.
2Stability of the object's composition
If a closed plastic cover is used to enclose the foam filling, then the filler structure is complete, but acoustic absorption performance deteriorates due to sound reflection
Solution Approach 1:
The closed plastic cover is replaced with a flexible bag made of textile material that is acoustically permeable. This flexible shell maintains structural integrity and containment while allowing sound waves to penetrate and be absorbed by the foam particles inside, eliminating the harmful sound reflection effect.
Solution Approach 2:
The acoustically disadvantageous solid plastic cover is replaced with a porous, acoustically permeable textile material. This porous structure allows sound transmission while maintaining the filler's structural integrity, enabling both containment and acoustic absorption functions.
3Object-affected harmful factors
If foam particles from viscoelastic foam are used in the filling, then acoustic absorption capacity increases, but production cost increases
Solution Approach 1:
The invention uses composite foam particles comprising both viscoelastic and non-viscoelastic foam materials in specific proportions. This composite approach optimizes acoustic absorption performance while controlling production costs by combining the beneficial properties of different foam types rather than using expensive viscoelastic foam exclusively.
4Reliability
If the plastic film is made impermeable to media, then the filler is gas-tight and can be evacuated, but additional processing steps (evacuation and perforation) are required
Solution Approach 1:
The invention extracts and removes the complex evacuation and perforation processing steps by using a permeable textile bag instead of an impermeable plastic film. The gas-tight sealing function is eliminated in favor of direct acoustic permeability, simplifying the overall process while maintaining the essential containment function.
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 proposed solution significantly enhances the acoustic absorption and insulation properties of the components, allowing for improved sound management in motor vehicles, while also simplifying the assembly process by providing more time for placement and reducing the need for complex evacuation and perforation procedures.
Implementation Method 1
The filling is a mixture of foam particles, wherein the mixture comprises a first portion of non-viscoelastic foam and a second portion of viscoelastic foam
Implementation Method 2
significantly enhances the acoustic absorption and insulation properties of the components
Implementation Method 3
containing a filling of open-cell and/or mixed-cell foam particles
Implementation Method 4
allowing for compression and re-expansion
Data Source
AI summary
An acoustically active component for a motor vehicle, to a method for producing an acoustically active component for a motor vehicle, and to a method for using a component according to the invention in a motor vehicle in an intended manner. The components are particularly suitable for use as acoustically active interior or exterior components.