FBG Sensor Bolt Joint Surface Pressure Detection
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Solution Overview
Problem
Current methods for detecting joint surface pressure in bolt connections, such as ultrasonic testing and thin film sensors, face challenges with low precision and practicality, especially in high-precision equipment assembly, where accurate and uniform pressure control is crucial for equipment performance.
Innovation Solution
An FBG sensor-based method that detects joint surface pressure by converting strain data from embedded sensors, determining the size and position of the FBG sensor embedding slot based on strain transfer theory and single bolt connection joint surface pressure distribution, allowing for precise and real-time measurement without affecting the joint surface connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic testing is used to detect joint surface pressure, then nondestructive testing can be performed, but detection precision is low due to noise and external factors
Solution Approach 1:
The patent replaces ultrasonic testing with a strain-based detection method using FBG sensors. Instead of using acoustic waves that are susceptible to noise, the invention embeds sensors that directly measure strain on the joint surface, converting the detection mechanism from acoustic to mechanical/electrical measurement, thereby achieving higher precision while maintaining nondestructive testing capability
Solution Approach 2:
The patent introduces an FBG sensor as an intermediary element embedded in the joint surface. This sensor acts as a mediator that directly experiences and measures the strain caused by joint surface pressure, providing a more accurate measurement pathway compared to external ultrasonic testing
2Measurement precision
If thin film sensors are embedded in the joint surface to detect pressure in real time, then real-time detection is achieved, but the sensor cannot be removed which may impact connection and cause calibration failure
Solution Approach 1:
The patent divides the detection system into separable components: the FBG sensor is embedded in a removable sensor assembly rather than being permanently fixed in the joint surface. This segmentation allows the sensor to be installed for calibration and measurement, then removed without compromising the permanent integrity of the joint surface connection
Solution Approach 2:
The patent performs calibration using the embedded FBG sensor before final assembly and operation. The preliminary calibration action establishes the relationship between sensor output and actual joint surface pressure, ensuring accurate measurement capability while allowing the sensor to be removed afterward without affecting the permanent connection
3Measurement precision
If direct pressure sensor embedding is performed on the joint surface, then accurate pressure detection can be achieved, but the joint surface connection is affected and damaged
Solution Approach 1:
The patent uses the FBG sensor as an intermediary that measures strain rather than directly measuring pressure. This indirect measurement approach allows accurate detection of joint surface pressure through strain correlation without requiring direct pressure sensor embedding that would damage the joint surface connection
Solution Approach 2:
The patent replaces direct pressure sensing with strain-based sensing using FBG technology. By measuring the strain on the joint surface and correlating it to pressure through calibration, the system achieves accurate pressure detection without the need for invasive pressure sensor embedding that would compromise joint integrity
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 method enhances measurement precision and reliability, enabling accurate detection of joint surface pressure with minimal damage, overcoming limitations of existing detection methods by reducing noise impact and avoiding direct pressure sensor embedding.
Implementation Method 1
detecting the strain capacity of connected pieces by an embedded FBG sensor
Implementation Method 2
On the basis of the strain transfer theory of the embedded FBG sensor
Data Source
AI summary
The present invention belongs to the technical field of joint surface pressure detection of connecting pieces, and provides an FBG sensor-based bolt fastening joint surface pressure detection method, comprising the steps of determining the size and the position of an FBG sensor; and determining the pressure of a joint surface measuring position on the basis of the single bolt connection joint surface pressure distribution theory, and completing calibration in real-time correspondence to the strain and pressure values to realize precise detection of the joint surface pressure. Determining the size and the position of the FBG sensor embedding slot according to the above method can ensure the reliability and accuracy of strain information; and an accurate strain-joint surface pressure curve can be obtained in combination with the determination of the joint surface pressure, which provides a practical and feasible method for the research on the bolt connection joint surface pressure.