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SAE J1594 (OCT2025)

Vehicle Aerodynamics Terminology
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This terminology document is intended to provide a common nomenclature for use in publishing road vehicle aerodynamics data and reports.

The purpose of SAE J1594 (OCT2025) is to provide a common nomenclature (set of terms and definitions) for use in the automotive and mobility industries, specifically when dealing with vehicle aerodynamics.

This standard ensures that engineers, researchers, and manufacturers around the world use the same language and conventions when communicating data, publishing reports, and performing tests related to how air interacts with a road vehicle.


Typical Usage

The standard is primarily used by vehicle aerodynamicists, design engineers, and testing facilities, including wind tunnels. It establishes a uniform way to describe and report key measurements, forces, and components, which is critical for **aerodynamic development** and research aimed at improving vehicle performance and efficiency.

Key areas and conventions covered typically include:

  • Aerodynamic Forces and Moments: Defining terms like drag, lift, side force, pitching moment, yawing moment, and rolling moment.
  • Axes System: Specifying the orientation of the vehicle's coordinate system (e.g., establishing that the x-axis is positive rearward and the z-axis is positive upward) to ensure forces and moments are consistently referenced.
  • Coefficients: Defining how aerodynamic force and moment coefficients are calculated.
  • Component Naming: Providing a suggested naming convention for typical aerodynamic components used on passenger cars and light trucks (a feature added in a recent revision).

By using this standardized terminology, the industry ensures that aerodynamic data is **clear, comparable, and consistent** across different tests, companies, and international publications.

SDO SAE: SAE International
Document Number J1594
Publication Date Oct. 2, 2025
Language en - English
Page Count 13
Revision Level 202510
Supercedes
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