Hose Fatigue Evaluation via Strain and Image Data
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Solution Overview
Problem
Current methods for evaluating hose fatigue resistance fail to determine the degree of deformation over time due to repeated internal pressure applications, lacking the ability to assess how deformation progresses during fatigue testing.
Innovation Solution
A hose fatigue resistance evaluation method that uses strain gauges and markers attached to the hose surface, combined with camera imaging, to acquire and analyze strain and image data, allowing for the determination of shape changes between multiple time points at identical internal pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hose is repeatedly subjected to high internal pressure during use, then the hose experiences fatigue and deformation, but the ability to determine and monitor the degree of deformation over time is insufficient
Solution Approach 1:
The patent introduces markers as intermediary elements attached to the hose surface, which serve as reference points for measuring deformation. These markers enable the camera to capture and quantify shape changes by tracking their displacement between images, thus solving the problem of insufficient deformation measurement capability without interfering with the hose's structural integrity or fatigue behavior.
Solution Approach 2:
The patent replaces traditional mechanical measurement systems with an optical measurement system using a camera and image processing. Instead of using mechanical extensometers or contact-based sensors that may interfere with the hose or be difficult to apply, the system uses non-contact optical imaging to capture hose deformation, thereby improving measurement precision while avoiding the limitations of mechanical approaches.
2Productivity
If traditional impact pressure test methods are used, then the evaluation process is simple, but the ability to determine how the hose deforms during fatigue and how deformation progresses is lost
Solution Approach 1:
The patent implements continuous or periodic imaging during the pressure testing process, capturing the hose's shape at multiple time points throughout the fatigue test. This continuous monitoring approach maintains evaluation efficiency by using automated image capture and processing, while simultaneously preserving deformation characteristics data that would be lost in traditional single-point or post-test inspection methods.
Solution Approach 2:
The patent establishes a feedback loop where images of the hose under pressure are captured, processed to determine shape changes, and analyzed to assess fatigue resistance. This feedback mechanism provides real-time or near-real-time information about deformation progression, enabling researchers to monitor how the hose responds to repeated pressurization and make informed decisions about test termination or design improvements, thus recovering the deformation characteristics information without significantly reducing evaluation efficiency.
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 effectively determines changes in hose deformation over time, identifying areas of significant deformation and the degree of damage, enabling improved fatigue resistance assessment and potential enhancements.
Implementation Method 1
acquiring strain data by using the strain gauge
Implementation Method 2
acquiring image data by capturing an image of an external shape of the hose using a camera device
Data Source
AI summary
A hose to be evaluated is installed on a fixing frame in a preset shape, and a strain gauge and markers are attached to a surface of the hose. During a course of application of predetermined internal pressure to the hose, strain data is acquired using the strain gauge and an image of an external shape of the hose is captured using a camera device to acquire image data. Based on the strain data and the image data acquired, a change in the shape of the hose between a plurality of time points at identical internal pressure is determined. Such hose fatigue resistance evaluation method can determine changes in the degree of deformation of a hose over time due to repeated application of internal pressure.