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HVE-related Papers at the SAE 2012 World Congress

At the SAE 2012 World Congress, several papers contained HVE-related content. The following publications are now available to purchase on the SAE website by clicking on the paper number:

Potential for Hydroplaning Behavior during Transient Maneuvers
L. Daniel Metz - Metz Engineering & Racing, LLC

Recent research on the effects of tire hydroplaning has examined the hydroplaning phenomenon and its potential effects on vehicle maneuvering from (1) geometric, (2) straight line braking/acceleration and (3) steady-state cornering maneuver points of view. In this work, we focus on the potential for hydroplaning during a transient maneuver: a standardized double lane change maneuver (ISO3888-1). Using both closed-form calculations and the HVE software suite, it is shown that partial hydroplaning has only a small-to- moderate potential to occur during portions of such maneuvers, but is not likely throughout the entire duration of the maneuver.

A Comparison of 3D Model Dynamic Simulation Results with Low-Speed Crash Test Data
Daniel Fittanto, Kathleen Allen Rodowicz - Exponent Inc

Evaluation of vehicle impacts may involve the use of computer simulations. While simulation programs with two-dimensional impact models have been used for decades, more recent three-dimensional impact models have been developed. This research compares DyMESH, the three-dimensional vehicle impact model in HVE-SIMON, with full-scale vehicle crash tests involving low-speed rear impacts. Exponent Failure Analysis Associates (Phoenix, Arizona) conducted rear impact research involving two virtually identical 1983 Nissan Pulsar NX 2-door vehicles. One vehicle was stationary, while the second vehicle impacted the rear of the first vehicle in an aligned configuration. Tests were run at impact speeds ranging from 5 to 20 MPH. Tri-axial accelerometers were positioned in both vehicles and vehicle acceleration and velocity responses were recorded. SIMON-DyMESH was used to simulate these impact tests. DyMESH utilizes a mesh shell determined by the three-dimensional geometry of the vehicle. Crush stiffness coefficients used by DyMESH may not directly translate from A and B stiffness values used in two-dimensional impact simulation programs. Therefore, a method for calculating crush stiffness coefficients for use in three-dimensional impact models using barrier crash test data was applied. SIMON-DyMESH simulated acceleration pulses and velocity changes were compared to the crash test data. The effect of adjusting a simulation input parameter related to the coefficient of restitution was evaluated.

Empirical Testing of Vehicular Rotational Motion
Duane R. Meyers, Thomas W. Parrott, Timothy P. Austin - Wisconsin State Patrol

Vehicles often rotate during traffic collisions due to impact forces or excessive steering maneuvers. In analyzing these situations, accident reconstructionists need to apply accurate deceleration rates for vehicles that are both rotating and translating to a final resting position. Determining a proper rate of deceleration is a challenging but critical step in calculating energy or momentum-based solutions for analytical purposes.

Simulating Moving Motorcycle to Moving Car Crashes
Todd A. Frank, James W. Smith, Graeme F. Fowler, Kelly Bosch - Exponent Inc
Jarrod W. Carter - Origin Engineering, LLC

There has been little published research into simulating two-moving motorcycle-to-car collisions for the purpose of accident reconstruction. In this paper a series of two-moving crash tests were conducted to study collisions of this type. These tests used a range of speeds for the cars and the motorcycles involved, with perpendicular and oblique intersection collision impact configurations. The tests were then simulated with two popular crash simulation packages which were not designed to simulate motorcycles. The purpose of this study was to evaluate existing techniques and develop new techniques for simulating motorcycles in these software packages and then to examine the ability of each package to simulate a two-moving motorcycle-to-car crash. The results demonstrate that it is indeed possible to simulate a motorcycle in these packages and that both packages can simulate two-moving motorcycle-to-car crashes reasonably well. Obviously, as with any simulation of a physical event, there are limitations, and they are thoroughly discussed.

For an additional listing of papers containing case studies, validations and other HVE-related content, please visit the Library section of the EDC website. To learn more about the capabilities of HVE, HVE-2D and HVE-CSI, contact EDC at 888.768.6216.

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