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Truck and Bus Aerodynamic Device and Concept Terminology

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J2971_201908
  • Current
Published 2019-08-02 by SAE International in United States
This SAE J2971 Recommended Practice describes a standard naming convention of aerodynamic devices and technologies used to control aerodynamic forces on truck and buses weighing more than 10000 pounds (including trailers).
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Guidelines for Aerodynamic Assessment of Medium and Heavy Commercial Ground Vehicles Using Computational Fluid Dynamics

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J2966_201704
  • Current
Published 2017-04-18 by SAE International in United States
This document outlines general requirements for the use of CFD methods for aerodynamic simulation of medium and heavy commercial ground vehicles weighing more than 10 000lbs. The document provides guidance for aerodynamic simulation with CFD methods to support current vehicle characterization, vehicle development, vehicle concept development and vehicle component development. The guidelines presented in the document are related to Navier-Stokes and Lattice-Boltzmann based solvers. This document is only valid for the classes of CFD methods and applications mentioned. Other classes of methods and applications may or may not be appropriate to simulate the aerodynamics of medium and heavy commercial ground vehicle weighing more than 10 000lbs.
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SAE Fuel Consumption Test Procedure (Engineering Method)

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J1526_201509
  • Current
Published 2015-09-17 by SAE International in United States
This document describes a fuel-consumption test procedure that utilizes industry accepted data collection and statistical analysis methods to determine the difference in fuel consumption between vehicles with a gross vehicle weight of more than 10,000 pounds. This test procedure can be used for an evaluation of two or more different vehicles but is not to be used to evaluate a component change. Although on-road testing is allowed, track testing is the preferred method because it has the greatest opportunity to minimize weather and traffic influences on the variability of the results. All tests shall be conducted in accordance with the weather constraints described within this procedure and shall be supported by collected data and analysis. This document provides information that may be used in concert with SAE Recommended Practices J1264, J1252, J1321, and J2966 as well as additional current and future aerodynamic and vehicle performance SAE standards.
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Guidelines for Aerodynamic Assessment of Medium and Heavy Commercial Ground Vehicles Using Computational Fluid Dynamics

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J2966_201309
  • Historical
Published 2013-09-17 by SAE International in United States
This document outlines general requirements for the use of CFD methods for aerodynamic simulation of medium and heavy commercial ground vehicles weighing more than 10 000lbs. The document provides guidance for aerodynamic simulation with CFD methods to support current vehicle characterization, vehicle development, vehicle concept development and vehicle component development. The guidelines presented in the document are related to Navier-Stokes and Lattice-Boltzmann based solvers. This document is only valid for the classes of CFD methods and applications mentioned. Other classes of methods and applications may or may not be appropriate to simulate the aerodynamics of medium and heavy commercial ground vehicle weighing more than 10 000lbs.
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Truck and Bus Aerodynamic Device and Concept Terminology

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J2971_201304
  • Historical
Published 2013-04-09 by SAE International in United States
This SAE J2971 Recommended Practice Truck and Bus Aerodynamic Device Terminology document describes a standard naming convention of aerodynamic devices and technologies used to control aerodynamic forces on truck and buses weighing more than 10,000 pounds (including trailers).
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Test Method for Measuring Power Consumption of Hydraulic Pumps for Trucks and Buses

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J1341_201211
  • Current
Published 2012-11-19 by SAE International in United States
This document covers evaluation techniques for determining the power consumption characteristics of engine driven hydraulic pumps used on heavy-duty trucks and buses. The testing technique outlined in this SAE Recommended Practice was developed as part of an overall program for testing and evaluating fuel consumption of heavy-duty trucks and buses. The technique outlined in this document provides a description of the test to be run to determine power consumption of these engine driven components, the type of equipment and facilities which are generally required to perform these tests are discussed in SAE J745. It is recommended that the specific operating conditions suggested throughout the test be carefully reviewed on the basis of actual data obtained on the specific vehicle operation.
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SAE Wind Tunnel Test Procedure for Trucks and Buses

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J1252_201207
  • Current
Published 2012-07-16 by SAE International in United States
The scope of this SAE Recommended Practice is sufficiently broad that it encompasses the full range of full-scale medium and heavy duty vehicles represented as either full-scale or reduced-scale wind tunnel models. The document provides guidance for wind tunnel testing to support current vehicle characterization, vehicle development, vehicle concept development, and vehicle component development.
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Fuel Consumption Test Procedure - Type II

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J1321_201202
  • Current
Published 2012-02-06 by SAE International in United States
This document describes a rigorous-engineering fuel-consumption test procedure that utilizes industry accepted data collection and statistical analysis methods to determine the change in fuel consumption for trucks and buses with GVWR of more than 10,000 pounds. The test procedure may be conducted on a test track or on a public road under controlled conditions and supported by extensive data collection and data analysis constraints. The on-road test procedure is offered as a lower cost alternative to on-track testing but the user is cautioned that on-road test may result in lower resolution (or precision) data due to a lack of control over the test environment. Test results that do not rigorously follow the method described herein are not intended for public use and dissemination and shall not be represented as a J1321-Type II test result.
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Test Method for Measuring Power Consumption of Air Conditioning and Brake Compressors for Trucks and Buses

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J1340_201109
  • Current
Published 2011-09-12 by SAE International in United States
The testing techniques outlined in this SAE Recommended Practice were developed as part of an overall program tor testing and evaluating fuel consumption of heavy duty trucks and buses. The technique outlined in this document provides a general description of the type of equipment and facility which is necessary to determine the power consumption of these engine-driven components. It is recommended that the specific operating conditions suggested throughout the test be carefully reviewed on the basis of actual data obtained on the specific vehicle operation. If specific vehicle application is not known, see SAE J1343.
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Joint RCCC/SAE Fuel Consumption Test Procedure (Short Term In-Service Vehicle) Type 1

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J1264_201105
  • Current
Published 2011-05-10 by SAE International in United States
This recommended practice provides minimum requirements for testing components or systems of the type which can be switched from one truck to another with relative ease; i.e., aerodynamic devices, clutch fans, radial tires, and the like. The test utilizes in-service fleet vehicles, operated over representative routes. The relative fuel effectiveness of the component or system under test is determined as a percentage improvement factor. This factor is calculated using the relative fuel usage of like vehicles operating with and without the specific component or system under evaluation. Accuracy capability employing this test technique is either ±1% or ±2%, depending upon the method of fuel measured. (See paragraph 7.4.)
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