Bridge damping ratio rapid identification method based on stationary detection vehicle

By using a two-degree-of-freedom joint state model of a stationary inspection vehicle and a bridge, along with a dual noise reduction mechanism, the problems of sensor quantity and road surface roughness affecting the damping ratio identification of small and medium-span bridges were solved, achieving efficient and economical bridge damping ratio identification.

CN121720680BActive Publication Date: 2026-05-26CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date
2026-02-13
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies for identifying the damping ratio of small-to-medium span bridges require a large number of sensors, are complex to install and maintain, and are hampered by unknown random excitations introduced by road surface roughness, which affect the identification accuracy and make it difficult to achieve efficient and economical damping ratio identification.

Method used

A stationary inspection vehicle method is adopted. By stopping the inspection vehicle at the mid-span of the bridge and using the acceleration response of the bridge after the passing vehicle excites it and then drives away, a two-degree-of-freedom joint state model of the inspection vehicle and the bridge is established. Combining the dual anti-noise mechanism of adaptive signal-to-noise ratio weight and Huber weight, a two-stage parameter identification strategy of profiled analysis is adopted to identify the first-order frequency, modal mass and damping ratio of the bridge.

Benefits of technology

It eliminates the need to install sensors on the bridge structure, simplifies the operation process, reduces interference from road surface roughness, and improves recognition accuracy and stability, making it particularly suitable for rapid inspection of small and medium-span bridges.

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Abstract

This invention discloses a rapid bridge damping ratio identification method based on a stationary inspection vehicle, belonging to the field of bridge structure vibration testing technology. The method includes: parking the inspection vehicle at the mid-span of the bridge under inspection; exciting the bridge vibration using a passing vehicle and then driving away; collecting the acceleration response of the inspection vehicle in the attenuation segment; establishing a dynamic model of the attenuation segment of the vehicle-bridge coupled system; constructing a two-degree-of-freedom joint state model, internalizing the vehicle-bridge interaction force as a linear combination of system state variables; extracting the effective attenuation segment through signal preprocessing and introducing a dual anti-noise mechanism of adaptive signal-to-noise ratio weights and Huber weights; and employing a profiled two-stage parameter identification strategy, first locking the frequency and modal mass, and then finely scanning and identifying the bridge's first-order damping ratio. This invention requires only a single inspection vehicle and an acceleration sensor, eliminating the need to deploy sensors on the bridge structure. It has strong anti-interference capabilities, high identification accuracy, and is suitable for rapid inspection of small-to-medium span bridges.
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