Laminated Seat Back Panel Material for Premium Sound and Rigidity
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Solution Overview
Problem
Existing vehicle interior materials struggle to balance high rigidity for a luxurious appearance with low-pitched, high-quality hitting sounds, as increasing rigidity typically results in high-pitched sounds.
Innovation Solution
A laminated vehicle interior material structure with specific thicknesses and Young's moduli relationships between layers, ensuring a balance of rigidity and mass ratio to produce a luxurious appearance and low-pitched hitting sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of a material is increased to ensure a luxurious appearance, then the luxurious feeling in appearance is improved, but the hitting sound becomes high-pitched and lacks high-quality feeling
Solution Approach 1:
The patent applies composite materials by creating a laminated structure consisting of multiple layers (base material layer and cover layer) with different material properties. The base material layer provides structural rigidity while the cover layer contributes to mass and sound characteristics, achieving both luxurious appearance and high-quality hitting sound through the synergistic combination of different materials
Solution Approach 2:
The patent employs parameter changes by precisely controlling the thickness, Young's modulus, and density parameters of each layer in the laminated structure. By adjusting these parameters and establishing specific mathematical relationships between them, the material achieves the optimal balance between rigidity for appearance and mass for producing low-pitched, high-quality hitting sounds
2Ease of manufacture
If a press-molded body structure is used to ensure ease of sewing and strength, then ease of manufacture and strength are improved, but no consideration is given to the hitting sound from the press-molded body
Solution Approach 1:
The patent transitions from a single press-molded body to a laminated composite structure where the base material layer can be easily manufactured and sewn while the cover layer is specifically designed to improve hitting sound quality, thus addressing both manufacturing ease and sound quality requirements
Data Source
AI summary
This vehicular interior finishing material has a layered structure including n layers (where n is a natural number equal to or greater than 2), and at least includes a substrate that is a first layer and a skin layer that is an nth layer. The vehicular interior finishing material is configured such that formula (1) is satisfied, where di (mm) is the thickness of an i-th layer, Ei (MPa) is the Young's modulus, and ρ (g/cm3) is the density of the entire vehicular interior finishing material. In addition, this seat back panel is formed using the vehicular interior finishing material.94<∑i=1n(Ei×di)2<1000×(∑i=1ndi)×ρ(1)