D-Pillar Garnish Labyrinth Gap Design for Rear Wind Noise
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Solution Overview
Problem
High-speed air flowing over a small gap between a vehicle's rear spoiler and garnish creates a negative pressure differential, causing air from the cabin to vent through the gap and produce wind noise, disturbing passengers.
Innovation Solution
A vehicle garnish assembly featuring a chamfered design and curvy, labyrinth flow path defined by the D-pillar and rear spoiler garnishes, which slows air speed and directs it through a convoluted path to reduce wind noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a small gap is maintained between the rear spoiler and garnish for aesthetic purposes, then the appearance is improved, but wind noise increases due to high-speed air flow through the gap
Solution Approach 1:
The garnish incorporates curved and convoluted flow paths instead of straight gaps, directing air flow in a meandering pattern that reduces velocity and minimizes wind noise while preserving the visual appearance of the gap
Solution Approach 2:
The garnish is divided into multiple sections with varying curvature profiles, creating a segmented flow path that progressively reduces air speed through the gap while maintaining aesthetic continuity
2Object-affected harmful factors
If the garnish design includes complex curved flow paths to reduce wind noise, then wind noise is reduced, but manufacturing complexity increases
Solution Approach 1:
The curvature parameters of the garnish flow path are optimized to achieve effective noise reduction while remaining within manufacturable limits, balancing aerodynamic performance with production feasibility
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 combination of a chamfered design and labyrinth flow path significantly reduces wind noise by impeding air flow through the gap, minimizing turbulence and enhancing passenger comfort.
Implementation Method 1
High-speed air flowing over a small gap between the spoiler and the garnish may cause air from the open cavity behind the garnish to vent through the small gap due to a negative pressure differential created between the stagnant air behind the garnish and the high-speed air on the outside of the garnish
Data Source
AI summary
A vehicle comprising having a vehicle body including a lower side, a rear quarter window and a rear spoiler garnish, the vehicle defining an inner passenger compartment; a D-pillar garnish configured to be mounted on the vehicle body between the rear spoiler garnish and the lower side of the vehicle, the D-pillar garnish including an outer garnish body having a first predetermined curvature portion; and an inner garnish body. The rear spoiler garnish includes an outer rear spoiler garnish and an inner rear spoiler garnish, the inner rear spoiler garnish having a second predetermined curvature portion. A gap is defined between a rear edge of the outer garnish body and a lower edge of the rear spoiler garnish, and the first predetermined curvature portion and the second predetermined curvature portion defining a convoluted flow path through the gap.