Light Bar Wind Shield Design for Noise Reduction
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Solution Overview
Problem
Light bars mounted on vehicles often produce undesirable sounds due to wind interaction, particularly when oriented or positioned in certain ways, leading to noise issues for users.
Innovation Solution
A light bar assembly design featuring a housing with fins and fin gaps, where a wind shield covers some but not all fin gaps, particularly those closer to the bottom side, to reduce wind noise, and includes a clamping mechanism for secure attachment using ridge and fin catches, with end caps allowing axial airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the light bar housing includes fins with fin gaps for heat dissipation, then the cooling efficiency is improved, but wind noise is generated when the vehicle is in motion
Solution Approach 1:
The wind shield is selectively positioned to cover only certain fin gaps (specifically those more closely spaced) while leaving other fin gaps (more widely spaced) uncovered. This local differentiation allows the design to block wind noise paths in critical areas while maintaining heat dissipation through uncovered gaps, resolving the contradiction between noise reduction and cooling efficiency
2Object-affected harmful factors
If the wind shield covers all fin gaps to eliminate wind noise, then wind noise is reduced, but heat dissipation is compromised
Solution Approach 1:
Rather than uniformly covering all fin gaps or leaving them all uncovered, the wind shield selectively covers only certain fin gaps based on their spacing characteristics. This localized approach allows the system to achieve wind noise reduction in critical areas while preserving heat dissipation pathways in other areas, thus resolving the contradiction between noise reduction and thermal management
3Reliability
If the light bar housing is designed with a secure attachment mechanism using ridge and fin catches, then the reliability of mounting is improved, but the device complexity increases
Solution Approach 1:
The attachment mechanism utilizes the existing structural features of the light bar housing (ridges and fins) as integral components of the mounting system. The ridge catch engages with the ridge and the fin catch engages with the fin, allowing the structure to serve its own mounting function without requiring separate fastening components, thus achieving reliable mounting while minimizing added complexity
Data Source
AI summary
A light bar assembly may include a light bar housing having a bar length. The light bar housing may include a plurality of fins projecting from the light bar housing. The light bar housing may further include a plurality of fin gaps. Each fin gap may be disposed between adjacent respective fins. Each fin gap may also have a gap length running longitudinally along a majority of the bar length of the light bar housing. The light bar assembly may also include a wind shield disposed on the light bar housing. The wind shield may cover some, but not all, of the fin gaps along a majority of each respective gap length.