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Journal Article

How Drivers Lose Control of the Car

2024-03-06
Abstract After a severe lane change, a wind gust, or another disturbance, the driver might be unable to recover the intended motion. Even though this fact is known by any driver, the scientific investigation and testing on this phenomenon is just at its very beginning, as a literature review, focusing on SAE Mobilus® database, reveals. We have used different mathematical models of car and driver for the basic description of car motion after a disturbance. Theoretical topics such as nonlinear dynamics, bifurcations, and global stability analysis had to be tackled. Since accurate mathematical models of drivers are still unavailable, a couple of driving simulators have been used to assess human driving action. Classic unstable motions such as Hopf bifurcations were found. Such bifurcations seem almost disregarded by automotive engineers, but they are very well-known by mathematicians. Other classic unstable motions that have been found are “unstable limit cycles.”
Research Report

Automated Vehicles and Infrastructure Enablers: Curbs and Curbside Management

2024-03-06
EPR2024005
Curbs are as key to automated driving system (ADS) navigation, operation, and safety as they are for human driven vehicles. The design, maintenance, and management of curbs and adjacent infrastructure can make the difference in whether ADS vehicles can pick up and deliver passengers and goods safely, efficiently, and effectively. Curbs may also be key to integrating ADS services with other forms of active and human-driven transportation. Benefits from accessibility, reduced emissions, and strong supply chains require that ADS vehicles be able to dock curbside in a manner that does not disrupt traffic or impede safe movement of people walking, biking, or using a mobility device. Automated Vehicles and Infrastructure Enablers: Curbs and Curbside Management addresses considerations regarding the curb with respect to pick up and drops for passengers and freight, as well as managing and designing both sides of the curb with respect to automated vehicles and other types of shared mobility.
Standard

Titanium Alloy Bars, Forgings, and Forging Stock, 7.0Al - 4.0Mo, Annealed

2024-03-06
WIP
AMS6915D
This specification covers a titanium alloy in the form of bars up through 6.000 inches (152.40 mm), inclusive, in nominal diameter or least distance between parallel sides, forgings of thickness up through 6.000 inches (152.40 mm), inclusive, and stock for forging of any size (see 8.6).
Standard

Digital Annex of Diagnostic Trouble Code Definitions and Failure Type Byte Definitions

2024-03-06
CURRENT
J2012DA_202403
The J2012 Digital Annex of Diagnostic Trouble Code Definitions Spreadsheet provides DTC information in an excel format for use in your organization's work processes. The column headings include the same information as contained in the J2012 standard. Information in the excel spreadsheet will be updated several times annually and the spreadsheet includes a column heading denoting which DTCs have been updated in the current version.
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