Hose Fatigue Evaluation via Strain and Image Data
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Solution Overview
Problem
Current methods for evaluating hose fatigue resistance do not effectively determine changes in deformation over time due to repeated internal pressure applications, lacking the ability to assess how deformation progresses during fatigue.
Innovation Solution
A hose fatigue resistance evaluation system that includes a fixing frame, a pressurization mechanism, strain gauges, markers, a camera device, and a calculation unit to quantify deformation changes by analyzing strain and image data over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If impact pressure test method (JIS K 6330-8) is used to evaluate hose fatigue resistance, then the evaluation process is simple and straightforward, but the ability to determine how the hose is deformed during fatigue and how deformation progresses is lost
Solution Approach 1:
The patent introduces markers as intermediary objects attached to the hose surface and a camera device as an intermediary measurement tool. The markers serve as visual references that capture deformation information, while the camera acts as a non-contact intermediary to record the hose's shape changes during fatigue testing, thereby preserving deformation progression data without complicating the test procedure
Solution Approach 2:
The patent replaces traditional mechanical contact-based deformation measurement methods with an optical measurement system. Instead of using mechanical gauges that physically contact the hose, the system uses a camera to capture images of markers on the hose surface, substituting mechanical measurement with optical field-based measurement to obtain deformation information
2Loss of time
If traditional fatigue testing without deformation monitoring is used, then the testing time and resources are reduced, but the understanding of hose deformation characteristics and fatigue progression is insufficient
Solution Approach 1:
The patent implements continuous deformation monitoring throughout the fatigue testing process. The camera device continuously captures images of the hose at various pressure cycles, maintaining continuous measurement of deformation characteristics without interrupting the fatigue test, thereby obtaining comprehensive deformation data throughout the entire testing duration
Solution Approach 2:
The patent creates visual copies of the hose's deformation state through camera imaging. By capturing images of markers on the hose surface at different time points and pressure levels, the system creates a visual record (copy) of the deformation progression, allowing analysis of deformation characteristics without physically interfering with the test
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
Enables accurate determination of deformation changes in hoses under repeated pressure, identifying areas of significant deformation and progression of damage, thereby improving fatigue resistance assessment and potential improvements.
Implementation Method 1
a strain gauge and a marker attached to a surface of the hose; a camera device capturing an image of an external shape of the hose
Implementation Method 2
a pressurization mechanism repeatedly applying predetermined internal pressure to the hose
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 system can determine changes in the degree of deformation of a hose over time due to repeated application of internal pressure.