Pivotable Trailer Fairing Panels for Drag Reduction
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Solution Overview
Problem
Rear trailer fairings that aim to reduce aerodynamic drag often obstruct the rear doors, requiring users to dismount and reattach them for loading/unloading, which is inconvenient and inefficient.
Innovation Solution
A rear aerodynamic drag reduction system comprising a main wall panel and a secondary wall panel, both pivotably coupled to the rear frame assembly, with a locking mechanism that automatically deploys and stows the panels in sync with the rear swing door, allowing seamless access without the need for manual reattachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rear trailer fairings are installed to reduce aerodynamic drag, then fuel efficiency is improved, but the rear doors become obstructed requiring manual dismounting and reattachment for loading/unloading
Solution Approach 1:
The fairing system is made dynamically adjustable through pivotable coupling mechanisms that allow the main wall panel and secondary wall panel to rotate between different positions. The panels can pivot from a deployed position (providing aerodynamic drag reduction) to a stowed position (clearing the rear doors for loading/unloading operations), resolving the contradiction between fuel efficiency and door accessibility.
Solution Approach 2:
The fairing system is divided into multiple independent panels (main wall panel and secondary wall panel) that can be independently positioned and controlled. This segmentation allows the aerodynamic panels to be separated from the door area when needed, enabling doors to open freely while maintaining the ability to deploy aerodynamic coverage when the panels are in their deployed positions.
2Ease of operation
If manual dismounting and reattachment of fairings is required for loading/unloading, then door access is enabled, but time and labor are lost
Solution Approach 1:
The fairing system incorporates automatic deployment and stowage capabilities through locking mechanisms that engage or disengage based on door position. When the rear doors are closed, the locking mechanism automatically deploys the panels to their aerodynamic positions. When doors are opened for loading/unloading, the locking mechanism automatically stows the panels, eliminating the need for manual intervention and reducing time loss.
Solution Approach 2:
The system uses the door position as feedback to automatically control panel deployment. The locking mechanism detects whether doors are open or closed and相应地 adjusts the panel positions - deployed when doors are closed for aerodynamic efficiency, and stowed when doors are open for loading/unloading operations, thereby minimizing time loss without manual intervention.
3Loss of energy
If aerodynamic fairings are deployed to streamline the rear end, then drag reduction is achieved, but the complexity of the system increases with multiple moving parts
Solution Approach 1:
The fairing system combines multiple functions into integrated components. The main wall panel and secondary wall panel are coupled together through locking mechanisms that simultaneously manage both panels' positions. This merging of functions (aerodynamic coverage, door clearance, and automatic positioning) into unified structural elements reduces overall system complexity despite the multiple moving parts required for aerodynamic performance.
Data Source
AI summary
A rear aerodynamic drag reduction system is configured to be coupled to a rear frame assembly of a trailer including a rear frame and a rear swing door. The rear drag reduction system includes a main wall panel configured to be coupled to the rear frame assembly to extend generally rearwardly of the trailer at least partially along a height of the trailer, and a secondary wall panel configured to be movably coupled to the rear swing door of the trailer to extend along a width of the trailer. The main wall panel and the secondary wall panel are each movable relative to the rear frame assembly between a deployed position and a stowed position. A locking mechanism of the drag reduction system is configured to releasably couple the main wall panel and the secondary wall panel to each other to prevent relative movement between the main wall panel and the secondary wall panel when the main and secondary wall panels are in their deployed positions.