Foamed Multi-Wall Noise Reduction Member for Vehicle Fenders
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Solution Overview
Problem
Current noise reduction solutions for vehicle cabins are inadequate in achieving high sound absorption and insulation while minimizing vehicle weight, with existing materials and structures either failing to effectively absorb noise or increasing the vehicle's weight significantly.
Innovation Solution
A noise reduction member with a multi-wall structure made of foamed material, featuring a solid skin layer and pleated design, is attached to the fender inner space surfaces to enhance sound absorption and insulation, and includes a rear noise reduction member extending vertically to further reduce noise leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound absorption or sound insulation material is provided in the fender inner space, then noise reduction performance is improved, but vehicle weight increases
Solution Approach 1:
The patent applies porous foamed material to create the noise reduction member. The foamed structure provides numerous pores and cavities that effectively absorb sound waves and reduce noise transmission, while the cellular structure keeps the material lightweight. This resolves the contradiction by using the inherent properties of porous foamed materials to achieve both noise reduction and weight reduction simultaneously.
Solution Approach 2:
The noise reduction member is divided into multiple wall portions (first wall portion, second wall portion, third wall portion) that are arranged in a segmented manner within the fender inner space. This segmentation creates multiple interfaces for sound reflection and absorption, improving noise reduction performance while using less material overall, thus maintaining lightweight characteristics.
2Object-affected harmful factors
If a solid skin layer is added to the foamed material, then sound insulation performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent creates a composite material structure by combining foamed material with a solid skin layer. The foamed material provides sound absorption through its porous structure, while the solid skin layer enhances sound insulation by blocking sound transmission. These two materials are integrated into a single composite noise reduction member that can be manufactured as one piece, resolving the contradiction by achieving enhanced performance without proportionally increasing manufacturing complexity.
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 and insulates noise within the fender inner space, reducing noise leakage into the vehicle cabin while maintaining a lightweight structure, thus improving cabin quietness without increasing vehicle weight.
Implementation Method 1
the wall portions form a multi-wall structure by extending in the fender inner space... the noise reduction member has a lightweight structure, and has the noise in the fender inner space absorbed into both of the first and second wall portions
Implementation Method 2
the first and second wall portions form a multi-wall structure... effectively absorbs and insulates noise within the fender inner space, reducing noise leakage into the vehicle cabin
Data Source
AI summary
Disclosed herein is a technique for further improving the quietness in a vehicle cabin while reducing an increase in the weight of a motor vehicle. A noise reduction member, arranged in a fender inner space defined between a fender panel serving as an exterior panel for a motor vehicle and an inner fender forming a wheelhouse, includes a pair of wall portions which are made of a foamed material and arranged to be spaced apart from each other.