Composite Member Damage Assessment via Pressure Differential Monitoring
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Solution Overview
Problem
Existing methods for assessing damage to composite members, such as those in vehicles, are cumbersome and costly, requiring sensors and pressure differentials that add weight and complexity, and can potentially cause damage, especially in delicate components.
Innovation Solution
A method involving creating a pressure differential in a composite member's cavity, monitoring the rate of change over a period, storing this as a reference value, and comparing subsequent measurements to determine if the member is defective, without maintaining prolonged pressure differentials, which reduces stress on the composite and accounts for initial leakage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor and monitoring instrument are attached to the composite panel to monitor pressure differential, then damage assessment capability is improved, but weight and device complexity increase
Solution Approach 1:
The patent extracts the monitoring function from a permanent sensor system and implements it through a temporary, removable monitoring instrument that connects to the composite panel only during assessment. This allows damage assessment capability while avoiding the weight and complexity of permanently attached sensors and their plumbing infrastructure.
Solution Approach 2:
The monitoring is performed periodically or on-demand rather than continuously. The pressure differential is established temporarily, monitored for a specific duration, and then released. This periodic approach provides necessary damage assessment data without requiring continuous sensor attachment, thereby reducing overall device complexity and weight.
2Measurement precision
If differential pressure is applied to the composite panel surface to detect damage, then measurement precision is improved, but harmful effects on the composite member increase
Solution Approach 1:
The patent establishes a baseline reference pressure differential measurement on an undamaged composite panel before assessing damaged panels. This preliminary action allows for comparison that improves measurement precision while using minimal pressure differentials that do not risk causing additional damage to delicate composite structures.
Solution Approach 2:
The patent applies only the minimum necessary pressure differential required to detect damage, rather than using excessive pressure. By establishing a reference value with a moderate pressure differential and comparing subsequent measurements against this reference, the method achieves sufficient measurement precision while minimizing harmful effects on the composite member.
3Reliability
If pressure differential monitoring is performed continuously, then damage detection reliability is improved, but energy consumption and time required increase
Solution Approach 1:
The patent performs a preliminary monitoring step to establish a reference value for the composite panel's pressure differential characteristics. This reference value is stored and used for subsequent comparisons, eliminating the need for continuous monitoring while maintaining damage detection reliability through efficient reference-based assessment.
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 assesses damage by comparing rate of change in pressure differentials, reducing the risk of causing damage and accounting for initial leakage variations, thereby providing a reliable and stress-reduced assessment of composite member integrity.
Implementation Method 1
establishing a first pressure differential between the at least one cavity and the surrounding ambient pressure
Data Source
AI summary
A method of assessing damage to a composite member requires the formation of a composite member comprising at least one cavity. A first pressure differential is then established between the cavity and the surrounding ambient pressure. The rate of change of the pressure differential over a first predetermined period is monitored and then the pressure differential is allowed to subside. The result of the monitoring step is stored as a reference value, so that after the composite member is damaged, or after it has been in service for a predetermined time, the test can be repeated and compared with the reference value. If the result of the repeated monitoring differs from the reference value by more than a predetermined amount, it is determined that the composite member is defective.