Shade Device Slat Cross-Section Geometry for Glare and Stability
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Solution Overview
Problem
Existing shading devices with sinusoidal slats lack optimal light guiding properties and stability, leading to inadequate glare protection and uneven illumination, while also being prone to bending and noise issues in winds.
Innovation Solution
The use of slats with a cross-section featuring an odd number of alternately curved partial corrugation sections, where the outer section is concave towards the lower rail and the inner section is convex, providing a monotonically decreasing radius of curvature, which deflects light effectively and enhances stability and noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sinusoidal slats are used for shading devices, then light scattering and glare protection are improved, but light guiding properties and illumination uniformity deteriorate
Solution Approach 1:
The slat cross-section is segmented into multiple alternating convex and concave curved areas instead of a simple sinusoidal shape. This segmentation creates distinct light reflection zones that improve both glare protection and light distribution. The multiple curved surfaces divide incident light into different reflection paths, achieving uniform illumination while maintaining glare reduction.
Solution Approach 2:
Different regions of the slat cross-section are given different curvature radii and orientations. The convex and concave areas have specifically designed local geometries that optimize light reflection angles. This local quality variation ensures that light is scattered appropriately for glare protection while maintaining good light guiding properties and uniform illumination distribution.
2Object-affected harmful factors
If sinusoidal slats are used to scatter direct light, then glare protection is improved, but curtain stability and resistance to bending deteriorate
Solution Approach 1:
The slat cross-section employs multiple alternating convex and concave curved areas with specifically designed curvature radii. These curved geometries provide structural reinforcement while maintaining the light scattering function. The alternating curvature pattern creates a more rigid cross-sectional shape that resists bending and buckling forces from wind loads, improving overall curtain stability.
3Object-affected harmful factors
If slats are positioned close together for effective shading, then shading performance is improved, but noise from wind increases
Solution Approach 1:
The alternating convex and concave curved areas at the slat edges create a streamlined profile that reduces wind turbulence. When slats are positioned close together, these curved surfaces guide wind flow more smoothly across the gap between slats, reducing vortex formation and associated noise. The curved geometry minimizes abrupt flow separations that would otherwise generate significant wind noise.
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 configuration achieves better daylight guiding properties, high stability, and reduced glare, with a uniform illumination intensity distribution, while maintaining a pleasing appearance and minimizing noise from winds.
Implementation Method 1
the slat cross-section which, starting from its side lying on the outside in a horizontal position, has a course with three partial corrugation sections which are curved alternately in opposite directions to one another... the outer partial corrugation section in the fully open position having a concave section towards the lower rail curvature and starts with an outwardly convex area
Implementation Method 2
with good light guiding properties... deflects light effectively... achieves better daylight guiding properties
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
The device has lamellae (1) including uneven-partial wave sections bending alternative to each other in an opposite direction. One of the partial wave sections includes a concave curve for a bottom bar in a completely opened curtain position. The lamellae are arranged at a distance to a closed curtain, such that a minimum elevation height (H) of each lamella is twisted against a curtain lifting direction. External sides of the lamellae rest close to a curved peak (17) of another one of sections of the lamellae in the completely opened curtain position.