Vehicle Cowl Unit Reinforcement Plates Noise Isolation
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Solution Overview
Problem
Current cowl top panels in vehicles fail to effectively block both low-frequency load noise from tires and high-frequency acceleration permeation noise from engines, as they either allow low-frequency vibrations to pass through or permit high-frequency noise to be transmitted via air.
Innovation Solution
A cowl unit design incorporating first and second reinforcement plates that form closed space portions between the cowl top panel and the dash panel, and between the cowl top upper panel and the first reinforcement plate, respectively, to block low-frequency vibrations and high-frequency noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cowl top panel is made stiffer to prevent engine room components from being pushed to the vehicle room during collision, then structural safety is improved, but noise sensitivity increases
Solution Approach 1:
The cowl top panel is designed with non-uniform thickness to achieve local quality optimization. The thickness varies from 3mm to 5mm across different regions of the panel, allowing certain areas to provide enhanced stiffness for structural safety while other areas maintain lower stiffness to reduce noise sensitivity
Solution Approach 2:
The reinforcement plate serves as an intermediary element between the cowl top panel and the cowl top upper panel. This intermediary structure provides additional stiffness support for structural safety while creating acoustic isolation that reduces noise transmission into the vehicle room
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
Simultaneously reduces low-frequency noise from tires and high-frequency noise from engines by minimizing vibration transfer through the cowl unit, thereby reducing noise introduction into the vehicle cabin.
Implementation Method 1
a first reinforcement plate including one end bonded to a front surface of the cowl top panel, bent downward at one side of the first reinforcement plate
Implementation Method 2
an opposite end of the first reinforcement plate bonded to one side of the bending line so that a first closed space portion is formed between the first reinforcement plate and the cowl top panel
Data Source
AI summary
A cowl unit includes a cowl top panel connected with a dash panel by forming a bending line in a vehicle width direction, a cowl top upper panel bonded in the vehicle width direction along a top end of the cowl top panel, a first reinforcement plate, and a second reinforcement plate. The cowl top upper panel is assembled to a front glass. The first reinforcement plate includes a first end bonded to a front surface of the cowl top panel. The cowl top panel is bent downward at the first end of the first reinforcement plate. A second end of the first reinforcement plate is bonded to one side of the bending line. A first closed space portion is formed between the first reinforcement plate and the cowl top panel. The second reinforcement plate includes a first end bonded to a front end of the cowl top upper panel.