Acceleration Sensor for Bridge Vehicle Motion Analysis
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Solution Overview
Problem
Existing measurement systems for vehicle weight and speed on bridges require multiple sensors, leading to high installation costs and efforts, as they need to detect speed, wheel axis locations, and deformation amounts.
Innovation Solution
A measurement instrument that uses a single acceleration sensor to acquire width-direction acceleration and vertical-direction acceleration, analyzing the motion of moving objects on structures to compute passing duration, stoppage, path changes, and entering direction, reducing the need for multiple sensors and simplifying installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors (speed detection sensors, wheel axis detection sensors, deformation amount measurement units) are installed to measure vehicle speed, wheel axis locations, and deformation amounts, then measurement precision is improved, but device complexity and installation costs increase
Solution Approach 1:
The patent combines multiple measurement functions (speed detection, wheel axis detection, deformation measurement) into a single acceleration sensor that measures acceleration in multiple directions. This merging of functions reduces the number of sensors from multiple separate devices to one integrated sensor, thereby reducing device complexity while maintaining measurement precision through multi-axis detection capabilities
Solution Approach 2:
The acceleration sensor is designed to perform multiple measurement functions simultaneously - detecting speed through acceleration integration, determining wheel axis locations through directional acceleration patterns, and measuring deformation amounts through structural response analysis. This multi-functionality allows a single sensor to replace multiple specialized sensors, reducing overall system complexity
2Measurement precision
If multiple sensors are installed to detect speed, wheel axis locations, and deformation amounts, then measurement precision is improved, but installation efforts and costs increase
Solution Approach 1:
By merging multiple measurement capabilities into a single acceleration sensor installation, the patent reduces installation efforts from coordinating multiple sensor installations to one unified sensor deployment. This significantly simplifies the installation process while maintaining the ability to extract multiple measurement parameters (speed, position, deformation) from the single sensor's multi-directional acceleration data
3Device complexity
If a single acceleration sensor is used to analyze motion of moving objects, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent utilizes width-direction acceleration (lateral dimension) in addition to conventional vertical-direction acceleration measurements. By incorporating acceleration data from another dimension (width direction), the system maintains measurement precision for analyzing moving object motion while using a single sensor, as the multi-dimensional acceleration data provides comprehensive information about the object's movement characteristics
Data Source
AI summary
An acquisition unit acquires at least one of the vertical-direction acceleration and the width-direction acceleration of a surface of a structure on which a moving object moves from an acceleration sensor provided in the structure on which the moving object moves. An analysis unit analyzes the motion of the moving object moving on the structure on the basis of at least one of the vertical-direction acceleration and the width-direction acceleration.