What is reported to the EDR during high speed yaw events?
Kineticorp Accident Reconstructionist, Will Bortles, discusses our latest research “Event Data Recorder Performance during High Speed Yaw Testing Subsequent to a Simulated Tire Tread Separation Event.” Will presented the findings at SAE International’s 2019 World Congress Event (WCX). A special thanks to Daniel Koch, Gray Beauchamp, David Pentecost, George Rayburn, and Ryan Hostetler for their involvement with the project.
Publication Introduction:
This paper presents event data from the Sensing and Diagnostic Module (SDM) of a 2004 Chevrolet Malibu during high speed yaw testing. Yaw tests were performed using tires that were intact and tires that had the tread removed. The tires that had the tread removed were placed at various wheel positions on the vehicle (e.g. leading side – front, leading side -rear, trailing side – rear). This testing simulates the loss of control phase subsequent to a tread separation. Speeds up to 117 km/h (72.9 mph) were achieved. A simple electro-mechanical device was incorporated to the dynamic testing to simulate a low-severity non-deployment event that triggered the recording of pre-crash data by the SDM. The SDM data from the tests was imaged and compared to reference data from vehicle-mounted instrumentation recording wheel speed, steering angle, measured vehicle sideslip angle and GPS calculated over the ground speed. This paper examines the dynamic effect of high sideslip angles and changes to tire rolling radius, as a result of a tread separation, as it pertains to the accuracy of EDR reported vehicle speed.. ….. Purchase Full Publication
Full Publication:
Authors:
William Bortles, Daniel Koch, Gray Beauchamp, David Pentecost, George Rayburn, Ryan Hostetler
Related Case Studies, Content & Research:
SAE 2019-01-0430 – Low Speed Override of Passenger Vehicles with Heavy Trucks
SAE 2019-01-0418 – Speed Analysis of Yawing Passenger Vehicles Following a Tire Tread Detachment
SAE 2019-01-0413 – Braking and Swerving Capabilities of Three-wheeled Motorcycles
SAE 2019-01-0411 – Two Phase Heavy Truck Acceleration Model
Collision Magazine, Volume 12, Issue 1, 2017 – Fracture Energy Calculations for Wooden Utility Poles
SAE 2017-01-1427 – Deceleration Rates of Vehicles with Disabled Tires
SAE 2016-01-1470 – Post-Impact Dynamics for Vehicles with a High Yaw Velocity
SAE 2016-01-1468 – Tire Mark Striations: Sensitivity and Uncertainty Analysis
SAE 2016-01-1479 – The Relationship Between Tire Mark Striations and Tire Forces
SAE 2009-01-0092 – Determining Vehicle Steering and Braking from Yaw Mark Striations
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