GNSS Structural Safety Diagnosis via Absolute Displacement
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Solution Overview
Problem
Conventional safety diagnosis systems for structures rely on acceleration sensors, which require second-order integration to measure displacement, leading to accuracy deterioration and inability to directly measure displacement, making it difficult to assess post-earthquake residual deformations and long-term variations.
Innovation Solution
A safety diagnosis system utilizing a GNSS receiver to directly measure absolute displacement, calculating maximum inter-layer displacement and deformation angles, and providing a comprehensive evaluation display for structural safety, allowing for accurate and timely assessment of structural conditions without the need for synchronization of multiple receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration sensors are used to measure structural safety, then the system can diagnose safety based on acceleration data, but the displacement amount cannot be directly measured and requires second-order integration which accumulates errors and deteriorates accuracy
Solution Approach 1:
The patent replaces the mechanical acceleration sensor system with a GNSS receiver system that directly measures displacement. Instead of using acceleration sensors that require complex second-order integration processing, the GNSS receiver directly provides displacement data, eliminating the error accumulation problem and simplifying the measurement processing while improving accuracy.
2Measurement precision
If second-order integration is applied to acceleration data to obtain displacement, then displacement can be calculated, but errors accumulate during integration and measurement accuracy deteriorates
Solution Approach 1:
The patent substitutes the acceleration sensor-based integrated measurement system with a GNSS receiver that directly measures displacement. This replacement eliminates the second-order integration process entirely, thereby removing the source of error accumulation and improving both measurement accuracy and reliability.
3Measurement precision
If high-pass filter passage processing is used to avoid drift, then displacement measurement can be stabilized, but measurements requiring long time such as position difference before and after earthquake become impossible
Solution Approach 1:
The patent replaces the acceleration sensor system with a GNSS receiver system that directly measures displacement without requiring high-pass filter processing. This substitution allows the system to capture both immediate displacement during earthquakes and long-term position changes before and after earthquakes, eliminating the time window limitation imposed by filter processing.
4Measurement precision
If multiple GNSS receivers are installed to measure displacement at different positions, then comprehensive structural displacement can be measured, but system complexity and cost increase due to synchronization requirements
Solution Approach 1:
The patent applies segmentation by installing GNSS receivers at specific key positions (upper floor and foundation part) rather than requiring comprehensive coverage at all positions. This selective placement achieves sufficient measurement accuracy for safety diagnosis while avoiding the complexity and cost of deploying receivers throughout the entire structure.
Solution Approach 2:
The patent extracts only the essential measurement function from a potential multi-receiver system. By carefully selecting the minimum number of GNSS receivers needed to obtain accurate displacement data at critical locations, the system achieves the required measurement precision without the synchronization complexity and additional cost of deploying multiple receivers.
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
The system achieves high accuracy in structural safety diagnosis by directly measuring displacement, enabling the detection of post-earthquake residual deformations and long-term variations, and simplifies the system while reducing costs.
Implementation Method 1
one GNSS receiver installed on an upper floor of a structure... an absolute coordinate measured by the GNSS receiver
Data Source
AI summary
The invention provides a safety diagnosis system for structure, which comprises one GNSS receiver installed on an upper floor of a structure, a control device having a storage unit for storing a program which prepares an absolute displacement curve of the structure based on an absolute coordinate measured by the GNSS receiver and a displacement of the absolute coordinate, calculates a maximum inter-layer displacement and a maximum inter-layer deformation angle per each floor based on the absolute displacement curve and prepares an inter-layer deformation angle curve and a judging unit for performing a diagnosis of the safety of the structure based on the maximum inter-layer displacement and the maximum inter-layer deformation angle, and a display unit, wherein the control device calculates the maximum inter-layer displacement and the maximum inter-layer deformation angle per each floor and the inter-layer deformation angle curve based on a displacement of the absolute coordinate and the program and makes the display unit display a diagnosis result of the structure as evaluated by the judging unit based on at least one of the maximum inter-layer displacement and the maximum inter-layer deformation angle or the inter-layer deformation angle curve.