Helmet Damage Detection Using a Threshold-Severed Conductor
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Solution Overview
Problem
Detecting damage to helmet interiors, especially in multi-layered helmets, is difficult without disassembling them, and existing methods require complex components or monitoring equipment.
Innovation Solution
A device comprising an electrical conductor element and a movable trigger element that alters its conducting state based on a predefined force threshold, allowing damage detection without complex components, using a mechanical switch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection is used to detect helmet damage, then the detection method is simple, but interior damage and invisible damage cannot be detected
Solution Approach 1:
The patent replaces complex monitoring equipment with a simple electrical conductor element that changes its electrical state in response to mechanical deformation. The conductor element is embedded in the helmet's energy-absorbing layer, and when the layer deforms beyond a threshold, the conductor element's electrical conductivity changes, providing a reliable indicator of damage without requiring sophisticated monitoring systems.
2Measurement precision
If the helmet is disassembled to inspect interior damage, then interior damage can be detected, but the inspection process becomes complex and time-consuming
Solution Approach 1:
The helmet's energy-absorbing layer performs a dual function: it absorbs impact energy and simultaneously serves as the mounting structure for the conductor element. The layer's deformation directly actuates the conductor element, eliminating the need for separate inspection mechanisms or disassembly procedures. The system is self-monitoring through the intrinsic mechanical behavior of the energy-absorbing material.
3Measurement precision
If expensive monitoring equipment is used to detect helmet damage, then detection accuracy improves, but the device cost increases
Solution Approach 1:
The patent employs a simple electrical conductor element that can be manufactured at low cost using conventional techniques. The conductor element is designed to be replaced with each helmet, and its function is to provide reliable damage indication through electrical state changes. This approach eliminates the need for expensive, complex monitoring equipment while maintaining adequate detection accuracy for safety applications.
4Reliability
If complex components are used in the detection device, then detection capability improves, but the device becomes more complex and harder to manufacture
Solution Approach 1:
The patent merges the damage detection function with the helmet's existing energy-absorbing structure. The conductor element is embedded within or attached to the energy-absorbing layer, combining the structural component with the sensing function. This integration eliminates the need for separate, complex monitoring systems and simplifies both the device architecture and manufacturing processes.
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 reliable, cost-effective, and simple detection of helmet damage, including interior parts, without the need for sophisticated equipment, providing fail-safe results and minimizing power usage.
Implementation Method 1
an electrical conductor element, the electrical conductor element having a conducting state in which an electrical signal is conductable through the electrical conductor element, and a non-conducting state in which an electrical signal is not conductable through the electrical conductor element
Data Source
Figure 1~2
Figure 3
Figure 4~4a
AI summary
A helmet (1) comprises a shell element (4), a trigger element (5), an electrical conductor element (6), an energy absorbing element (7), and an indicator (3). The electrical conductor element (6) has a conducting state in which an electrical signal is conductable through the electrical conductor element (6), and a non-conducting state in which an electrical signal is not conductable through the electrical conductor element (6). The trigger element (5) is movable relative to the electrical conductor element (6) to sever at least part of the electrical conductor element (6). When the electrical conductor element (6) has been severed, it is no longer possible for the electrical conductor element (6) to conduct the electrical signal. The trigger element (5) is calibrated to move relative to the electrical conductor element (6) when a force greater than or equal to a pre-defined threshold impinges on the shell element (4) of the helmet (1). The threshold is equal to the force sufficient to permanently deform the energy absorbing element (7) of the helmet (1).