S-Shaped Bumper Beam Cross Section for Impact Energy Absorption
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Solution Overview
Problem
Vehicle bumper systems face challenges in achieving optimal impact resistance, energy absorption, and pedestrian safety while minimizing weight and cost, with existing solutions often compromising on design flexibility and predictability of energy absorption during impacts.
Innovation Solution
A structural plastic beam with an S-shaped cross section and integrated or separate metal crush cans, featuring stiffening ribs for enhanced strength and attachment to the vehicle frame, which provides improved impact resistance and pedestrian safety by distributing stress and maintaining consistent energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the beam weight is reduced to minimize vehicle weight, then the weight-to-strength ratio improves, but the impact resistance and energy absorption capability deteriorate
Solution Approach 1:
The beam employs an S-shaped cross-section with curved surfaces replacing flat geometries. This curvature distributes stress more effectively throughout the structure, enhancing bending strength and impact resistance while maintaining lightweight construction. The curved profile allows the beam to absorb impact energy through controlled deformation along its length.
Solution Approach 2:
The beam is constructed from composite materials that combine high strength-to-weight ratio properties. This allows the structure to achieve superior impact resistance and energy absorption capabilities without increasing overall weight, directly resolving the contradiction between lightweight design and impact protection.
2Ease of manufacture
If the beam structure is simplified to reduce manufacturing cost and component count, then ease of manufacture improves, but design flexibility and adaptability deteriorate
Solution Approach 1:
The S-shaped beam design serves multiple functions simultaneously: it provides structural support, absorbs impact energy, and adapts to different vehicle configurations. The universal design can be applied across various vehicle types and bumper systems, achieving both manufacturing simplicity through standardization and design flexibility through parameter adjustment.
Solution Approach 2:
The beam design allows for parameter changes in dimensions, material composition, and geometric features to adapt to different application requirements. This enables the same basic S-shaped structure to be optimized for specific vehicle models, impact requirements, or aesthetic preferences without requiring completely different designs.
3Loss of energy
If energy absorption is concentrated in specific zones to maximize efficiency, then energy absorption efficiency improves, but predictability and consistency of resistance level deteriorate due to peaks and valleys in loading
Solution Approach 1:
The beam is segmented into multiple zones along its length, with varying cross-sectional properties that distribute energy absorption throughout the structure. This segmentation creates a progressive deformation pattern that maintains consistent resistance levels during impact, avoiding sudden peaks and valleys in loading while preserving high energy absorption efficiency.
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 S-shaped beam with ribs demonstrates superior bending strength and weight-to-strength ratio, effectively absorbing impact forces and enhancing pedestrian safety by strategically engaging a pedestrian's leg, thus reducing injury and maintaining design adaptability.
Implementation Method 1
a beam's impact strength to weight ratio is important in order to provide optimal beam strength yet minimum vehicle weight. Also, 'efficiency' of the energy absorption is important, where the beam quickly reaches a predetermined value upon being impacted, and then maintains that resistance level for a period of time
Implementation Method 2
The S-shaped beam with ribs demonstrates superior bending strength and weight-to-strength ratio, effectively absorbing impact forces and enhancing pedestrian safety by strategically engaging a pedestrian's leg, thus reducing injury
Implementation Method 3
the cross beam having an S-shaped cross section... at least one of the end portions and center portion including sets of stiffening ribs, with at least one of the sets defining a triangular shape in a concavity of the beam for distributing stress
Data Source
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AI summary
A bumper system includes primary and secondary structural cross beams, at least one having an S-shaped cross section with forwardly-facing (or outwardly-facing) top concavity. The beams include different arrangements of stiffening ribs in concavities formed by the S-shaped cross section for impact and bending strength. In one form, the beams are made of polymeric material. The beams may include integrally formed crush cans for attachment to the vehicle frame, or alternatively can be attached to vehicle frame rail tips by separate metal crush cans and brackets.