Antenna Mount Bracket for Ice Load Resistance
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Solution Overview
Problem
Large microwave antennas in cold environments suffer from ice accumulation, leading to significant mechanical loads that can cause deformation and permanent damage, particularly in installations where ice shields and sway bars are impractical or undesirable, resulting in costly repairs.
Innovation Solution
A mechanical assembly for antenna mounting featuring a mounting bracket with a circular hole for axis of rotation and a pivot slot for fine adjustment, stabilizing the antenna against vertical loads, reducing torque and eliminating the need for additional components to manage horizontal loads, thereby enhancing reliability in adverse weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional antenna mounting hardware is used without ice shield and sway bar, then device complexity is reduced, but reliability deteriorates due to permanent damage from ice accumulation loads
Solution Approach 1:
The mounting bracket is segmented into multiple functional features: a circular hole for the primary fastener providing rotation axis, and a pivot slot for the second fastener providing fine adjustment and load distribution. This segmentation allows each feature to handle specific aspects of the mounting requirements, improving reliability without adding separate ice shields or sway bars.
Solution Approach 2:
The pivot slot introduces a new dimensional element to the mounting bracket, allowing movement and adjustment in a direction perpendicular to the primary rotation axis. This additional degree of freedom enables the bracket to accommodate thermal expansion, contraction, and ice accumulation loads without compromising the structural integrity or requiring additional support components.
2Reliability
If ice shield and sway bar are added to support ice loads, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The mounting bracket is designed with multi-functionality, serving both as the primary mounting structure and as the load-bearing component for ice accumulation. The combination of the circular hole and pivot slot creates a universal mounting solution that handles rotation, positioning, and load distribution simultaneously, eliminating the need for separate ice shields and sway bars.
Solution Approach 2:
The functions of mounting, rotation, positioning, and load support are merged into a single integrated bracket design. The circular hole and pivot slot work together as a unified system to provide both mechanical support and adjustment capabilities, consolidating what would traditionally require multiple separate components into one compact structure.
3Ease of manufacture
If single fastener mounting is used, then ease of manufacture is improved, but reliability deteriorates under vertical ice loads
Solution Approach 1:
The fastening system is segmented into two fasteners with distinct functions: the first fastener through the circular hole provides the primary rotation axis and structural support, while the second fastener through the pivot slot provides fine adjustment and distributes vertical loads. This segmentation allows each fastener to be optimized for its specific function while maintaining manufacturing simplicity.
4Adaptability or versatility
If pivot slot provides fine adjustment range, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The pivot slot geometry is designed with specific parameters (length, width, curvature radius) that provide a balanced range of motion for fine adjustment. By optimizing these parameters, the bracket achieves adequate adjustment capability for radiation direction while maintaining manufacturability with standard tolerances, avoiding excessive precision requirements.
Data Source
AI summary
A mechanical assembly provides an attachment of an antenna tower to an antenna that includes back ring attached to an antenna reflector. The assembly includes a horizontal beam and a bracket. The bracket includes a first, e.g. planar, portion and a second, e.g. planar, portion that meet at a corner. The first portion is configured to fasten to the antenna back ring and the second portion is configured to attach to the horizontal beam. The second portion includes a pivot slot for receiving a first fastener connecting the bracket to the horizontal beam, and includes a circular hole for receiving a second fastener connecting the bracket to the horizontal beam.