Non-Contact Bridge Vibration Testing via Digital Image Recognition
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Solution Overview
Problem
Traditional bridge vibration testing methods require numerous sensors and complex wiring, leading to high costs, long data acquisition cycles, and synchronization challenges, making them inefficient and damaging to the bridge structure.
Innovation Solution
A non-contact system and method using digital image recognition, which employs a camera, targets, and acceleration sensors to capture and analyze bridge vibrations, reducing the need for extensive sensor arrangements and wiring, while enabling precise and cost-effective vibration testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact measurement with multiple sensors is used to fully grasp bridge vibration characteristics, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the traditional mechanical contact measurement system (multiple physical sensors attached to the bridge) with an optical non-contact measurement system. A camera captures images of targets attached to the bridge, and image processing algorithms extract vibration information. This substitution eliminates the need for complex sensor wiring and installation while maintaining measurement capability.
Solution Approach 2:
The patent uses visual targets (markers) attached to the bridge that serve as optical copies or representations of the measurement points. Instead of directly measuring physical displacement with sensors, the system captures images of these targets and processes the visual information to derive vibration characteristics. This copying approach simplifies the measurement system while preserving the essential vibration data.
2Measurement precision
If multiple sensors are arranged on the bridge structure to capture comprehensive vibration data, then measurement precision is improved, but loss of time increases due to complex installation and data processing
Solution Approach 1:
The patent replaces the time-consuming process of installing and calibrating multiple physical sensors with a rapid image-based measurement approach. Targets are quickly attached to the bridge, and vibration data is captured through continuous imaging. This eliminates the lengthy sensor installation and synchronization calibration processes, significantly reducing the data acquisition cycle.
3Measurement precision
If contact measurement sensors are installed on the bridge to detect vibration, then measurement precision is improved, but object-affected harmful factors increase due to potential damage to the bridge structure
Solution Approach 1:
The patent replaces contact-based mechanical sensors that require physical attachment to the bridge structure with a non-contact optical measurement system. The camera and image processing system measure bridge vibration by tracking the position of visual targets without physically attaching measurement devices to critical structural components, thereby eliminating the risk of installation-induced damage.
4Measurement precision
If numerous sensors and complex wiring are used for bridge vibration testing, then measurement precision is improved, but ease of operation deteriorates due to complicated setup and synchronization requirements
Solution Approach 1:
The patent replaces the operationally complex system of multiple sensors requiring synchronization and wiring management with a simplified camera-based system. The camera naturally captures all targets simultaneously in each frame, eliminating synchronization issues. Image processing automatically extracts position information from multiple targets without requiring complex data coordination, greatly simplifying system operation.
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
This approach allows for high-precision, cost-effective, and non-damaging bridge vibration testing, reducing the number of sensors required and eliminating synchronization issues, thus enhancing the efficiency and applicability of bridge vibration analysis.
Implementation Method 1
the camera captures images containing all targets in real time
Implementation Method 2
the vertical acceleration sensor and the lateral acceleration sensor monitor the vibration of the camera itself in real time
Data Source
AI summary
Disclosed is a system and method for testing a structure mode of vibration based on digital image recognition, which comprises a camera, targets, a bridge, a vertical acceleration sensor and a lateral acceleration sensor; the camera is arranged near the bridge head of the bridge; the bridge is equipped with a plurality of targets equidistantly inside guardrails on both sides; and the vertical acceleration sensor and the lateral acceleration sensor are fixedly arranged on the camera. The present application avoids the arrangement of a large number of sensors and complicated wiring in the bridge vibration detection, saves time and reduces economic cost, is convenient to operate, has relatively high precision, and has broad application prospects.