Spring Boot Damping for Mobile Antenna Impact
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Solution Overview
Problem
Whip antennas in mobile vehicles face failures due to impact forces, as the spring and dielectric core absorb excessive energy, leading to deformation or damage, especially when the antenna is rigid and cannot bend without overstressing the spring.
Innovation Solution
A spring boot with a main body, interior chamber, and washer configuration that constrains the spring, providing additional damping and absorbing impact forces without overstressing the spring, formed from ethylene propylene diene monomer (EPDM) rubber with optional fins and water tunnels for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the antenna is made rigid to maintain structural integrity, then the antenna can support larger diameters and longer lengths for lower frequency reception, but the spring must absorb more impact energy leading to failure
Solution Approach 1:
The spring boot acts as an intermediary component between the spring and the antenna assembly. It distributes impact forces across a larger area of the spring, preventing localized overstressing while maintaining the rigid antenna structure needed for lower frequency reception. The boot material (ethylene propylene diene monomer) provides cushioning and force distribution.
Solution Approach 2:
The invention changes the physical parameters of the spring system by adding the spring boot, which modifies how impact forces are transmitted. The boot alters the stress distribution pattern, contact area, and force magnitude transmitted to the spring, allowing the same spring to handle higher impact energies without failure.
2Reliability
If the spring wire is made larger to increase elasticity and energy absorption, then the spring can absorb more impact energy, but the spring becomes less elastic and absorbs less energy
Solution Approach 1:
The spring system is segmented into two functional components: the spring itself (providing elasticity and rebound) and the spring boot (providing impact cushioning and force distribution). This segmentation allows each component to be optimized for its specific function without compromise - the spring remains highly elastic with thinner wire while the boot compensates for impact energy absorption.
3Reliability
If the spring is made too limp to absorb impact energy, then the spring can cushion impacts better, but the antenna over-rotates when hitting obstructions
Solution Approach 1:
The spring boot modifies the mechanical parameters of the spring system by providing distributed support and friction contact along the spring's length. This changes the rotational dynamics, providing enough resistance to prevent over-rotation while still allowing vertical compression for impact absorption. The boot's contact friction and geometric constraint alter the spring's rotational freedom.
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 spring boot design enhances the antenna's ability to absorb impact forces, preventing spring deformation and antenna damage by distributing the force and providing additional damping during both impact and recoil, thus increasing the antenna's survivability and extending its lifespan.
Implementation Method 1
a spring boot having an upper rim, a lower portion, and an interior chamber... This structure will enhance the ability of the antenna to absorb an impact without overstressing the spring and provide additional damping to the spring
Implementation Method 2
provide additional damping to the spring
Implementation Method 3
the spring boot can be formed of ethylene propylene diene monomer
Data Source
AI summary
A spring boot for use with an antenna comprises a cylindrical main body having an annular flange at the lower end thereof, and an annular rim at the upper end thereof. The flange has a plurality of mounting holes therethrough. The interior of the spring boot is hollow and is configured to match the shape of the antenna spring. When installed, the spring boot is fitted over the spring, and seated on an antenna mount, encircling the spring. Fasteners are installed through the mounting holes on the flange to affix the spring boot to corresponding bores in the mount. A washer is positioned atop the rim and is fixed between the antenna core and the spring. This configuration effectively constrains the spring boot between the core and the mount, so as to provide added damping to the antenna spring.