Experimental Evaluation of the Attenuation Effect of a Passive Damper on a Road Vehicle Bumper
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Summary
This study investigates the potential of passive friction dampers to enhance the impact energy attenuation capabilities of road vehicle bumpers. Motivated by the significant economic and human costs of road traffic accidents, particularly low-speed collisions that cause Whiplash Associated Disorders (WAD), the authors sought to determine if adding a passive control system could improve bumper performance. Passive systems were selected for their simplicity, stability, and low cost compared to active systems. Specifically, friction dampers were chosen over viscous alternatives due to their robustness and lack of leakage risk. The researchers conducted destructive impact tests using a pendulum hammer impact test machine. Specimens were taken from two different vehicle bumpers, designated B and C. Bumper B specimens were tested without a damper to establish a baseline trend, while Bumper C specimens were tested both with and without a friction damper constructed from springs with a stiffness of 44 kN/m. The hammer was released from four different heights to generate varying impact forces. Angles of the pendulum swing and resulting deformations were measured. Impact forces were calculated using derived equations based on the pendulum’s moment of inertia, mass, and swing angles. Results indicated that deformation increased linearly with impact load for Bumper B. For Bumper C, deformation was higher than Bumper B for equivalent forces, likely due to material differences. When the friction damper was added to Bumper C, the deformation response changed from linear to exponential, with a drastic increase in deformation at the highest impact force (9078.95 N). Energy absorption was calculated by integrating the area under the force-deformation curves. At a deformation of 2.5 cm, the bumper alone absorbed 119.42 J of energy, whereas the bumper-damper system absorbed 158.22 J. This represents an additional 38.8 J of energy absorption, or a 32.5% increase in attenuation capacity. The study concludes that integrating a passive friction damper into a vehicle bumper significantly improves its ability to absorb kinetic energy during collisions. This enhancement suggests that such systems could effectively mitigate damage and potentially reduce injury severity in low-speed impacts. The findings support the use of simple, low-cost passive friction elements as viable upgrades to standard bumper designs for better crashworthiness.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-25 |
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| extract | success | cached | — | — | 2 | 2026-06-26 |
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| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-26 |
| enrich | success | openalex | — | — | 1 | 2026-06-26 |
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| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-26 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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