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Open Access Publications from the University of California

Scholarly Works (4 results)

  • Article
Research Reports (1997)

This report outlines the development of a novel model for a single vehicle. The model uses a theory of a deformable medium which is known as a Cosserat point to model the deformation of the body of the vehicle. This theory is supplemented with various developments from vehicle system dynamics. The complete set of ordinary differential equations governing the vehicle's motion are presented and numerical simulations of the model under various operating conditions are discussed.

    Cover page: Models Of Vehicular Collision: Development And Simulation With Emphasis On Safety I: Development of a Model for a Single Vehicle
    • Article
    Research Reports (1997)
    In this report, an algorithm for the detection of collision between two vehicles is presented. The mechanical models used for the vehicles are based on the theory of a Cosscrat point. Here, we find it convenient to establish the corresponding models using the theory of a psuedo-rigid body. This theory facilitates the development of our collision-detection algorithm. The report concludes with four examples of vehicular impact scenarios in order to illustrate the applicability of the proposed algorithm.
      Cover page: Models of Vehicular Collision: Development and Simulation with Emphasison Safety II: On the Modeling of Collision between Vehicles in a Platoon System
      • Article
      Research Reports (1998)

      This report describes a procedure for detecting the geometry of the contact interface between vehicles. This technique uses a better approximation of the vehicle's shape and also preserves the advantage of the ellipsoidal model. This new model for the low relative velocity vehicular collision is based on a box model for the outer surface of the vehicle and is referred to as BM.

        Cover page: Models Of Vehicular Collision: Development And Simulation With Emphasis On Safety IV: An Improved Algorithm For Detecting Contact Between Vehicles
        • Article
        Research Reports (1999)

        This document constitutes a final report for MOU 39. It contains a User's Manual, Programmer's Guide, source code and underlying theory for the program MEDUSA. This program is capable of simulating both the normative driving dynamics and collision dynamics of an arbitrary number of vehicles. Its range of validity lies in the assumed nature of the vehicular collision, and it is recommended for use in studying low relative velocity impact scenarios at large time-scales. Keywords: IVHS America, Vehicle Dynamics, Collision Dynamics, Safety, computer Simluation, Animal and Simulation; A significant portion of this report is devoted to the vehicle and road models, the former composed of tire, collision, suspension and sprung mass models, augmented by a collision detector algorithm. The road model is sufficiently general to encompass variations in banking and sloping of highways. The report also contains the simulation results of several representative vehicular collision scenarios. These results are supplemented by the input files for MEDUSA and the visualization program SMARTPATH. Several features of these examples are also discussed in light of the improvements to MEDUSA that they motivated.

          Cover page: Models of Vehicular Collision: Development and Simulation with Emphasis on Safety V: MEDUSA: Theory, Examples, User's Manual, Programmer's Guide and Code
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