Ship Skin Damage Detection Using Capacitive Foil and Diode Rectification
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Solution Overview
Problem
Existing methods for detecting damage to a ship's outer skin, such as those described in DE 10 2010 054 754 A1, lack reliability and longevity, particularly in identifying small-calibre projectile damage that may go undetected, and require analysis of current flow to identify damage.
Innovation Solution
A method using a foil arrangement with a first and second conductive foil separated by an insulating foil, where an electrical voltage is applied to detect damage by bridging a test diode when the foils come into contact, allowing for direct attribution of damage through current flow, and including a control and monitoring unit for functionality checks and precise localization of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flow analysis is used to identify damage, then damage detection capability is provided, but reliability and longevity of detection are reduced
Solution Approach 1:
The patent extracts the essential detection signal by eliminating complex current flow analysis and focusing only on the binary state of current presence or absence. This simplifies the detection system while maintaining reliability by directly monitoring whether current flows through the conductive foils, rather than analyzing complex current characteristics.
Solution Approach 2:
The patent replaces complex electrical analysis systems with a simpler diode-based detection system. By using a diode to rectify and simplify the signal, the system substitutes complex measurement equipment with a straightforward current presence/absence detection mechanism, improving reliability while reducing complexity.
2Reliability
If functionality checks are performed frequently, then reliability monitoring is improved, but operational time for damage detection is reduced
Solution Approach 1:
The patent implements periodic functionality checks at predetermined intervals rather than continuous monitoring. This allows the system to maintain high reliability through regular testing while maximizing the operational time available for actual damage detection between check intervals. The diode-based system enables quick checks that minimize disruption to continuous damage detection capability.
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 approach enhances the reliability and longevity of damage detection by eliminating the need for current flow analysis, providing rapid and accurate identification of damage, including small-calibre projectile impacts, and ensuring continuous functionality over time with automated checks.
Implementation Method 1
a test diode connected in parallel to the foil arrangement is operated -- in a detection mode to detect potential damage to the ship's outer skin in the blocking direction or -- in a function control mode to test the detection capability of the foil arrangement in the passing direction
Data Source
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AI summary
The invention relates to a method for detecting damage to an outer skin of a ship, wherein a stress is applied to a capacitor formed by a first conductive film, an insulating film, and a second conductive film. In a detection mode for detecting damage, the stress is polarized in such a way that a test diode connected in parallel with the capacitor is operated in a reverse direction.