Curb Impacts

Question on 3D Simulation/msmac3D/HVOSM and other 3D Simulation models
MSI
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Curb Impacts

Post by MSI »

Q: Looking for some references in determining take off angle of a vehicle striking a curb. I seem to remember at one time having a reference that stated the rise would be the curb height and the run would be the vehicle's wheelbase. Any help would be greatly appreciated.
A: here's 4 papers on the subject of curb impacts...(SAE papers available at http://www.sae.org. Site down for maintenance so couldn't provide direct links...)
  • SAE 2002-01-0557 "Curb Impacts A Continuing Study In Energy Loss and Occupant Kinematics"
    • Steven E. Meyer, Joshua Hayden, Brian Herbst, Davis Hock and Stephen Forrest
      ABSTACT: Accident reconstruction analysis of both pre- and postimpact vehicle trajectory wherein an involved vehicle has collided with or traversed a roadside curb often leaves the analyst with uncertainty associated with the speed loss and accelerations attributable to these impacts. A review of available published data reveals very few studies considering the energy dissipated and transferred to the vehicle’s occupants. This paper quantifies the changes in vehicle velocity (delta-v) for various vehicles traversing a typical roadside curb at various approach angles and impact speeds. Vehicle accelerations are recorded in the vertical, longitudinal, and lateral directions. Resulting three-point belted driver movements are observed via an interior mounted video camera and general occupant motions are described.
      Curb impacts were conducted with four different passenger vehicles ranging in size from a small compact car to a large full-size sport utility vehicle. Additionally, residual vehicle damage is discussed as a function of impact speed and angle.
    2005-01-1175 "Vehicle Speed Changes and Accelerations Associated with Curb Impacts and a Comparison to HVE SIMON"
    • F. P. Bayan, A. L. Cipriani, A. D. Cornetto and T. A. Timbario
      This study was conducted to compare vehicle speed change and acceleration data from full scale testing to results generated by the SImulation MOdel Non-linear (SIMON) vehicle dynamic simulation model (version 2.0) within the Human Vehicle Environment (HVE) software. The study also sought to expand the body of existing curb impact tests and compare the present results to data from published literature.
      The results of the full scale testing of a 1996 Dodge Ram 1500 pickup are presented. Instrumented tests were performed at speeds up to approximately 6.7 m/s (15.0 mph) and at approach angles of 90„aƒnand 45„a. SIMON was used to simulate the full scale testing conducted by the authors. The simulation results, including primarily vehicle speed change (delta-v), and accelerations are compared to the results of full scale testing. The appropriate method for modeling curb profile within SIMON version 2.0 was studied and is presented in this paper. A comparison between available published literature and the test results from this study is also presented.
    2008-01-0158 Vehicle Speed Change and Acceleration Associated with Curb Impacts and a Comparison to Computer Simulation with a Multi-Point Radial Spring Tire Model
    • Bayan, Cornetto, R. E. Wahba, J. W. Higgins, J. A. Edwards and A. L. Cipriani
      Full-scale testing of a 1996 Dodge Ram 1500 Pickup and a 1990 Ford Escort was performed at two approach angles (of 45„aƒnand 90„a) into a 15 cm (6 in) concrete curb at speeds ranging between approximately 8 and 37 kmh (5 and 23 mph). These tests expanded upon results published by others, especially in the previously less-tested category of full-size pickup trucks.
    2006-01-0722 Simple Models for Analysis of Curb- and Soil-trip Rollover Events
    • Yibing Shi and Guy S. Nusholtz
      Abstract Simple rigid body dynamics models are related to analyze the curb- and soil-trip types of rollover events and experimental methods that are used to simulate these events. Equations for the models are given, and they are integrated numerically to obtain the solution. Solutions of the models provide a break down of the energy during these events, which exposes the importance of energy absorption, unloading, and friction during the impact-and-roll process.
      Furthermore, the models are used to derive the critical sliding velocity under different test parameters. They are also used to understand near-critical state
      responses of the vehicle, and the corresponding characteristics of the signals in the phase space.

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