Aerodynamic Underbody Structures for Heavy Truck Drag Reduction
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Solution Overview
Problem
Large vehicles with heavy loads face challenges in maximizing fuel efficiency due to increased aerodynamic drag, which existing aerodynamic structures on exterior surfaces do not adequately address.
Innovation Solution
Aerodynamic underbody structures comprising elongated panels and mounting structures that attach to the chassis, extending inward from the chassis frame rails, reducing turbulent flow and enhancing laminar flow, and are formed from materials with varying stiffness to accommodate airflow and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If aerodynamic structures are added to exterior vehicle surfaces, then aerodynamic performance is improved, but device complexity increases
Solution Approach 1:
The underbody is divided into multiple zones with dedicated aerodynamic structures for each zone (e.g., front bumper area, wheel well areas, rear bumper area). Each zone has specific panels and fairings tailored to its airflow characteristics, allowing targeted aerodynamic optimization without requiring complete redesign of the entire underbody.
Solution Approach 2:
The invention transitions from two-dimensional exterior surface modifications to three-dimensional underbody structures that extend downward from the chassis. This vertical dimension allows the aerodynamic panels to be positioned in the airflow path beneath the vehicle, creating effective flow control without adding lateral complexity to the vehicle profile.
2Loss of energy
If elongated panels extend downward from the chassis, then aerodynamic performance is improved by reducing turbulent flow, but manufacturing complexity increases
Solution Approach 1:
The underbody aerodynamic structure is segmented into multiple independent panels and fairings that can be manufactured separately and then assembled. Each panel is designed as a discrete component with standardized mounting interfaces, allowing modular manufacturing and assembly rather than requiring a single complex monolithic structure.
Solution Approach 2:
The mounting structures incorporate adjustable and movable components that allow the panels to be positioned and secured in various configurations. This dynamic mounting system provides flexibility in assembly and adjustment during manufacturing and installation, simplifying the overall manufacturing process while maintaining aerodynamic effectiveness.
3Device complexity
If mounting structures are integrated with elongated panels, then assembly complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The mounting structures are integrated with the elongated panels by incorporating mounting features directly into the panel design. The panels include built-in mounting elements such as tabs, flanges, and attachment points that are formed as part of the panel structure itself, eliminating the need for separate mounting components and simplifying assembly.
Solution Approach 2:
The mounting structures are pre-formed and pre-positioned during the panel manufacturing process rather than being added as separate steps. This preliminary integration of mounting features during panel fabrication ensures precise alignment and positioning, reducing the precision requirements during final assembly while maintaining strong structural attachment.
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
Improves aerodynamic performance by reducing drag, increasing laminar flow, and limiting cross-flow, while maintaining structural integrity and flexibility, thus enhancing fuel efficiency.
Implementation Method 1
The aforementioned components and configurations, in addition to others described herein, have been demonstrated to improve aerodynamic performance, e.g., by reducing turbulent flow, increasing laminar flow
Implementation Method 2
reducing turbulent flow, increasing laminar flow
Implementation Method 3
limiting or impeding aerodynamically penalizing cross-flow at a vehicle underbody
Data Source
AI summary
Aerodynamic underbody structures, assemblies with the same, and methods of manufacturing, integrating, and using the same. To improve the aerodynamic performance of a vehicle, e.g., a truck, such as a tractor-trailer, one or more aerodynamic underbody structures are integrated thereon. The aerodynamic underbody structures can each include an elongated panel (22) that attaches to a mounting structure (18) that attaches to a vehicle underbody, thereby allowing each elongated panel to extend downward into a flow path beneath the vehicle. The elongated panels may extend substantially in parallel, being spaced inward from outer chassis structures, wheels, and/or fairings, or can be angled relative to each other. The configurations and implementations of the aerodynamic components described herein can improve aerodynamic performance of vehicles.