Reconstruction and Analysis of Rollover Crashes of Light Vehicles
For automotive engineers involved in crash reconstruction and analysis, a knowledge of basic accident reconstruction principles and techniques is essential, but often insufficient to answer all of the questions posed by design engineers, regulators, and lawyers. This seminar takes participants beyond the basics of accident reconstruction to physical models and analysis techniques that are unique to the reconstruction of single-vehicle rollover crashes.
The seminar begins by discussing the common characteristics and phases of single-vehicle rollover crashes and giving an overview of the test procedures and data available for developing analysis techniques. The seminar then introduces participants to common types of physical evidence deposited on the roadway and the vehicle during a rollover crash. Participants then learn how to use this physical evidence to reconstruct the motion the vehicle experienced during the crash. Finally, the course introduces the techniques and methods available for analyzing each phase of a single-vehicle rollover crash. This course draws heavily on rollover testing from the literature that has utilized automated steering control and uses these tests to determine the rate of error of common rollover reconstruction techniques. Students will receive a 200-page book on rollover reconstruction that includes a table summarizing the rate of error of the techniques. Students will receive a copy of the SAE book, Rollover Crash Reconstruction, R-475 , which was co-authored by the instructor and includes a table summarizing the rate of error of the techniques.
This course has been approved by the Accreditation Commission for Traffic Accident Reconstruction (ACTAR) for 7 Continuing Education Units (CEUs). Upon completion of this seminar, accredited reconstructionists should mail a copy of their course certificate and the $5 student CEU fee to ACTAR, PO Box 1493, North Platte, NE 69103.
This course also qualifies as an elective credit in SAE's Accident Reconstruction certificate program.
What Will You Learn
- Name common characteristics and phases of rollover crashes
- Describe common rollover test procedures and the data they offer for reconstruction
- Identify and document common types of physical evidence from rollover crashes
- Use physical evidence to reconstruct the motion of a vehicle involved in a rollover crash
- Estimate the rate at which a vehicle will decelerate during each phase of a rollover crash
- Calculate the speed a vehicle was traveling during each phase of a rollover crash
- Determine what steering and braking inputs a driver utilized before a rollover
- Quantify the forces applied to a vehicle when it impacts the ground during a rollover
- Analyze the trajectory of an occupant that was ejected during a rollover
- Quantify the rate of error of common reconstruction techniques for rollover
Is This Course For You
- Types of Rollover Crashes and Rollover Statistics
- General Characteristics of Rollover Crashes
- Test Methods and characteristics; field relevance
- Physical Evidence from Rollover Crashes
- Scene evidence and documentation - photogrammetry to locate evidence
- Vehicle evidence and documentation
- Analysis Methods - Rollover Phase
- Average deceleration rates - dependence on surface and vehicle type?
- Non-constant deceleration models
- Evaluating roll motion from physical evidence - glass; scratch patterns; rim gouges
- Typical rollover characteristics - # of rolls v. rollover distance; typical roll velocity curves
- Roof-to-ground impact model - testing and validation
- Simulation - PC-crash; HVE; validation considerations of simulation software
- Analysis Methods - Trip Phase
- Physical evidence
- Analytical models: equations - static stability factor, increasing the complexity and accuracy; estimating the center of gravity height; estimating the roll moment of inertia; trip duration
- Simulation: PC-crash; HVE; validation considerations of simulation software
- Analysis Methods - Pre-Trip Phase (Loss-of-Control)
- Tire marks
- Striations and their meaning - uncertainty and sensitivity analysis
- Calculating speed loss
- Is the critical speed equation applicable?
- Testing - validation of striation analysis; validation of speed loss equations