Alpine Helmet Padding With Through Holes For Temperature Stability
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Solution Overview
Problem
Conventional alpine helmets face challenges in maintaining consistent impact protection and energy attenuation across a wide range of temperatures, as impact attenuating materials typically become harder in cold conditions and softer in warm conditions, compromising their effectiveness.
Innovation Solution
The design incorporates a padding assembly with structurally altered layers, including through holes in the inner layer to reduce density and enhance heat transfer, ensuring consistent energy absorption and impact attenuation from -25 °C to body temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impact attenuating materials are used in alpine helmets, then the helmet provides basic impact protection, but the materials become harder in cold temperatures and softer in warm temperatures, compromising consistent energy attenuation across the temperature range
Solution Approach 1:
The padding assembly is divided into multiple layers with different structural characteristics. The first layer contains through-holes creating a porous structure, while the second layer is substantially continuous. This segmentation allows each layer to contribute differently to energy attenuation, with the porous first layer providing better performance at cold temperatures and the continuous second layer maintaining effectiveness at warmer temperatures.
Solution Approach 2:
The padding assembly combines two different foam layer structures (porous first layer and continuous second layer) into a composite system. This composite structure leverages the complementary temperature-dependent properties of each layer type, achieving consistent energy attenuation across the full temperature range from -25°C to body temperature.
2Strength
If the padding material density is increased to improve energy absorption, then impact attenuation is enhanced, but heat transfer from the wearer's head is reduced, causing the helmet to remain cold in warm conditions
Solution Approach 1:
Different regions of the padding assembly have different density and porosity characteristics. The first layer is made porous with through-holes to facilitate heat transfer, while the second layer maintains higher density for energy absorption. This local quality variation allows the padding to simultaneously manage thermal comfort and impact protection.
Solution Approach 2:
The first layer is structured as a porous material with through-holes that extend through its thickness. This porous structure reduces the layer's thermal insulation properties, enabling heat transfer from the wearer's head to pass through the padding, while still maintaining adequate energy absorption capabilities.
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
The padding assembly maintains effective energy absorption and impact attenuation across a broad temperature range, providing continuous protection during alpine activities regardless of ambient conditions.
Implementation Method 1
through holes in the inner layer to reduce density and enhance heat transfer
Data Source
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Figure 3
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AI summary
An alpine helmet for protecting the head of a wearer while the helmet is worn over a broad temperature range includes an outer shell and an energy dissipating internal padding assembly coupled to the outer shell. The padding assembly includes a first pad layer disposed inwardly of a second pad layer which may be adjacent an inner surface of the helmet shell. The first pad layer includes an arrangement of structural alterations that affect the performance of the first layer.