Automotive Display Housing Crashworthy Structure for Lower HIC
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Solution Overview
Problem
Existing automotive display devices fail to meet safety regulations by causing excessive head injuries during a car accident due to inadequate impact resistance, necessitating a solution to reduce the Head Injury Criterion (HIC) number.
Innovation Solution
Incorporating a crashworthy structure in the expected impact area of the display device, which is designed to deform and absorb impact energy by connecting the center point of impact with fixed ends, utilizing local thinning, perforation, or filling with materials to extend impact duration and redistribute force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional rigid housing structure is used, then structural strength is maintained, but impact energy is not absorbed effectively causing high HIC values
Solution Approach 1:
The housing structure transitions from uniform rigidity to localized properties: rigid in non-impact areas to maintain structural strength, and compliant/crushworthy in impact-prone areas (front surface, corners, edges) to absorb impact energy and reduce HIC values
Solution Approach 2:
Crushworthy structures are pre-designed and positioned in the housing at locations expected to experience impact during accidents. These structures are prepared in advance to deform and absorb impact energy, thereby reducing the HIC number before actual impact occurs
2Object-affected harmful factors
If a compliant crashworthy structure is introduced, then impact energy absorption is improved, but device complexity increases
Solution Approach 1:
The housing is segmented into distinct functional zones: rigid structural portions for strength and compliant crushworthy portions for energy absorption. This segmentation allows each region to be optimized for its specific function without compromising the other
Solution Approach 2:
The housing employs composite construction combining rigid materials (for structural integrity) and compliant materials (for impact absorption). This composite approach enables simultaneous achievement of strength and energy absorption without requiring entirely separate components
3Duration of action of moving object
If the housing is made more compliant for safety, then impact duration is extended, but structural integrity under static load may be compromised
Solution Approach 1:
The housing structure exhibits dynamic characteristics: rigid under normal static conditions to maintain structural integrity, but compliant during impact events to extend impact duration. The crushworthy structures are designed to activate only under dynamic impact loads
Solution Approach 2:
The structural parameters of the housing are optimized to achieve different mechanical responses under different loading conditions. The crushworthy structures have specific geometric parameters (thickness, curvature, material properties) that enable them to deform in a controlled manner during impact while maintaining rigidity during static use
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 crashworthy structure effectively reduces the HIC number by preferentially collapsing and absorbing kinetic energy, ensuring compliance with safety regulations by extending impact duration and maintaining structural integrity under static testing.
Implementation Method 1
the cushioning structure fills the dished region... the crashworthy structure deforms and absorbs the impact energy
Implementation Method 2
the crashworthy structure deforms and absorbs the impact energy, thereby increasing collision time
Data Source
AI summary
A display device includes a housing. The housing includes a main body, a first fixed end, a second fixed end, a third fixed end, a fourth fixed end, and an opening area. The opening area is disposed at a lower half portion of the main body. The opening area has a first opening, a second opening, and a third opening. The first opening has an axis extending along a first direction substantially perpendicular to a bottom side of the main body. The second opening is disposed on a first side of the first opening and has an axis extending along a second direction having a first angle with respect to the first direction. The third opening is disposed on a second side of the first opening opposite to the first side and has an axis along a third direction having a second angle with respect to the first direction.