Vehicle Body Adhesive Distribution for Vibration Damping
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Solution Overview
Problem
Conventional vehicle body structures experience an extreme increase in rigidity when adhesives are uniformly applied, leading to reduced vibration damping performance in specific frequency bands and enhanced vibration transmission.
Innovation Solution
A vehicle body structure is designed with varying adhesive amounts per unit area in different overlapping parts, using adhesives with specific storage elastic moduli and loss factors to maintain rigidity while minimizing vibration transmission and maximizing damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is uniformly placed in joining parts, then joining strength is improved, but vibration damping performance deteriorates due to extreme rigidity increase
Solution Approach 1:
The patent applies different adhesive amounts in different regions: crossing parts (where multiple members overlap) receive reduced adhesive amounts compared to non-crossing parts. This local differentiation maintains sufficient joining strength while preventing excessive rigidity concentration that would harm vibration damping performance.
Solution Approach 2:
The patent changes the adhesive amount parameter spatially - specifically reducing the adhesive amount in crossing parts where multiple members (panel member, first rigid member, second rigid member) overlap. This parameter modification balances the rigidity-damping tradeoff by preventing rigidity extremes in critical overlapping regions.
2Strength
If adhesive amount is increased to improve joining strength, then rigidity increases, but vibration transmission increases and damping performance decreases
Solution Approach 1:
The patent implements local quality control by applying reduced adhesive amounts specifically in crossing parts where vibration transmission is most problematic. This localized approach maintains necessary joining strength while reducing the harmful rigidity-induced vibration transmission in critical regions.
3Strength
If rigid members are joined to panel member faces, then structural strength is improved, but vibration damping performance deteriorates in overlapping regions
Solution Approach 1:
The patent addresses the multi-member overlap problem by reducing adhesive amounts in crossing parts where the panel member, first rigid member, and second rigid member all intersect. This local modification prevents the extreme rigidity that would result from uniform adhesive application across all overlapping members.
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 configuration achieves both high rigidity and high damping performance, improving riding characteristics and noise reduction while ensuring body strength and comfort.
Implementation Method 1
the first joining part includes a first adhesive, with damping performance, that adheres to, and joins together, both the first rigid member and the panel member
Implementation Method 2
the panel joining part includes a panel adhesive, with damping performance, that adheres to, and joins together, both the panel member and the additional panel member
Implementation Method 3
the second joining part includes a second adhesive, with damping performance, that adheres to, and joins together, both the second rigid member and the panel member
Data Source
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AI summary
A vehicle body structure satisfies at least one of the following (A), (B), and (C): (A) an adhesive amount per unit area of a first adhesive in a second adjacent part is smaller than an adhesive amount per unit area of the first adhesive in a first adjacent part; (B) an adhesive amount per unit area of a panel adhesive in a second panel adjacent part is smaller than an adhesive amount per unit area of the panel adhesive in a first panel adjacent part; and (C) an adhesive amount per unit area of a second adhesive in a stacking adjacent part is smaller than an adhesive amount per unit area of the second adhesive in a non-stacking adjacent part.