Modular Bumper Crossbeam with Segmented Curvature
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Solution Overview
Problem
Current automobile bumper systems face challenges in absorbing and transferring crash energy effectively, particularly in low-overlap crashes, leading to potential damage and unfavorable insurance classifications due to their design constraints and limited flexibility.
Innovation Solution
A modular bumper system with a crossbeam and laterally supported extensions, featuring a V-shaped configuration and various coupling methods, enhances energy absorption and transfer during crashes, utilizing high-strength materials and a multi-component construction for improved rigidity and adaptability across different vehicle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the crossbeam end sections are curved to match vehicle body aerodynamics, then the appearance and aerodynamics are improved, but the flexibility for design is reduced and the barrier may slide off during low-overlap crashes
Solution Approach 1:
The crossbeam end section is divided into multiple segments (first end section, second end section, third end section) with different geometric configurations. The first and third end sections have reduced curvature while the second end section maintains higher curvature for aerodynamics. This segmentation allows each segment to be optimized for its specific function while maintaining overall vehicle appearance requirements.
Solution Approach 2:
Different portions of the crossbeam end sections are given different curvature characteristics tailored to their specific functions. The first end section has reduced curvature for barrier engagement, the second end section has higher curvature for aerodynamics, and the third end section has reduced curvature for structural support. This local differentiation resolves the contradiction between appearance and crash performance.
2Shape
If the crossbeam end sections have high curvature for aerodynamics, then the vehicle appearance and aerodynamics are improved, but the ability to absorb and transfer crash energy is reduced
Solution Approach 1:
The crossbeam is segmented into multiple end sections with different curvature levels. The first end section (with lower curvature) and third end section (with lower curvature) are positioned to engage barriers and absorb crash energy, while the second end section (with higher curvature) maintains aerodynamic performance. This segmentation allows simultaneous optimization of both crash energy absorption and aerodynamics.
Solution Approach 2:
Specific regions of the crossbeam are assigned different geometric properties: the first end section has reduced curvature for energy absorption, the second end section has higher curvature for aerodynamics, and the third end section has reduced curvature for structural support. This local quality differentiation enables the crossbeam to simultaneously achieve both crash performance and aerodynamic efficiency.
3Ease of manufacture
If a single-piece crossbeam design is used, then the manufacturing process is simplified, but the adaptability to different vehicle types and crash scenarios is reduced
Solution Approach 1:
The crossbeam is divided into multiple separable end sections (first end section, second end section, third end section) that can be independently designed and manufactured. These segments can then be assembled in different configurations to suit different vehicle types and crash requirements, providing adaptability while maintaining manufacturing efficiency through standardized component production.
Solution Approach 2:
The modular crossbeam design with separable end sections creates a universal bumper system that can be adapted to different vehicle types (passenger cars, commercial vehicles, etc.) and different crash scenarios (low-overlap, high-speed, offset crashes) by reconfiguring the same basic components, achieving multi-functionality without requiring completely different designs for each application.
4Force
If the bumper system is designed for high-speed crashes, then the crash box energy absorption is optimized, but the performance in low-speed and low-overlap crashes is compromised
Solution Approach 1:
The bumper system is segmented into multiple functional components: crash boxes for high-speed crash energy absorption, and modified crossbeam end sections with reduced curvature for low-overlap crash engagement. This segmentation allows each component to be optimized for its specific crash scenario while working together to provide comprehensive crash protection across different test conditions.
Solution Approach 2:
Different portions of the bumper system are optimized for different crash scenarios: the crash boxes are designed with specific energy absorption characteristics for high-speed crashes, while the crossbeam end sections are designed with reduced curvature and lateral support for low-overlap and low-speed crashes. This local optimization ensures reliable performance across all crash types without compromising either high-speed or low-overlap crash performance.
Data Source
AI summary
An automobile bumper arrangement includes a crossbeam coupled to side rails of an automobile via crash boxes, wherein the crossbeam has extensions disposed at end sections which are laterally supported on a corresponding crash box. A modular bumper system has a crossbeam, an extension and a crash box coupled to a side rail of an automobile, wherein the crossbeam has a standardized length and a vehicle-specific width of a bumper can be attained by varying the length of the extension.