PATH

Models of Vehicular Collision: Development and Simulation with Emphasis on Safety I: Development of a Model for a Single Vehicle

O'reilly, Oliver M.
Papadopoulos, Panayiotis
Lo, Gwo-jeng
Varadi, Peter C.
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.

Models of Commuters' Information Use and Route Choice: Initial Results Based on a Southern California Commuter Route Choice Survey

Abdel-aty, Mohamed A.
Vaughn, Kenneth M.
Kitamura, Ryuichi
Jovanis, Paul P.
Mannering, Fred L.
1993

This paper presents a statistical analysis of commuters' route choice behavior and the influence of traffic information. The analysis is based on a 1992 computer-aided telephone interview survey of Los Angeles area morning commuters. The results underscore the important relationship between the use of traffic information and the propensity to change routes. In addition, important relationships are uncovered relating the influence that commuters' socioeconomic characteristics and the level of traffic congestion they face have on traffic information use and route- change frequency. The...

Modeling The Santa Monica Freeway Corridor: Simulation Experiments

Skabardonis, Alexander
2002

The report describes the findings of a study to develop a simulation testbed for the Santa Monica freeway corridor. The study created one of the largest freeway corridor networks coded for the CORSIM microscopic simulation model. The coded network consists of about 10 miles of I-10 freeway and a surface street network with 75 signalized intersections. The results from the simulation experiments indicate that several CORSIM model parameters need to be adjusted in order to accurately simulate freeway facilities for California conditions. The calibrated CORSIM model produced reasonable and...

Modeling IVHS Emission Impacts. Volume 1: Background Issues and Modeling Capabilities

Guensler, Randall
Washington, Simon
Sperling, Daniel
1994

This paper examines the potential air quality impacts of Intelligent Vehicle Highway Systems (IVHS) upon important emission-producing vehicle activities and those parameters that affect emission rates. Important emission relationships are identified, a framework for comparative analysis is developed, and the general relationships between IVHS technology bundle characteristics and vehicle emission impacts are examined. The primary IVHS emission-related impacts that this project addresses are associated with changes in the average speed and operating mode (acceleration, deceleration, cruise...

Modeling IVHS Emission Impacts Volume II: Assessment of the Caline 4 Line Source Dispersion Model

Washington, Simon
Guensler, Randall
Sperling, Daniel
1994

This report assesses the ability of the emission estimating algorithms contained in version 4 of the CALINE line source dispersion model developed by Caltrans (CALINE 4) to accurately predict carbon monoxide emissions from a fleet of motor vehicles. The CALINE 4 model contains algorithms that predict carbon monoxide emissions from discrete modal events of idle, cruise, acceleration, and deceleration. The modified CALINE 4 model algorithms are used to predict CO impacts of an applied intelligent vehicle and highway system concept, automatic vehicle identification applied to electronic...

Modeling the Behavior of Traffic Information Providers

Malchow, M.
Kanafani, A.
Varaiya, P.
1997

This paper discusses two primary models which might be used to represent the locational behavior of traffic information providers. The characteristics which make traffic information unique as a service good are discussed and exploited in the models to show how the behavior of information providers might differ from that of firms in a traditional market. Questions are addressed regarding the clustering of competing providers and the efficiency of resulting output. The purpose of this paper is to contribute to a study regarding the future of the traffic information industry and the role of...

Modeling and Control of Articulated Vehicles

Chen, Chieh
Tomizuka, Masayoshi
1997

This report focuses on dynamic modeling and lateral control of commercial heavy-duty vehicles for highway automation. Two types of dynamic models are developed in the study of lateral control of tractor-semitrailer vehicles in an Automated Highway System (AHS): a complex simulation model and two simplified control models. Two control algorithms for lateral guidance are designed. The first is a baseline steering control algorithm and the second is a coordinated steering and independent braking control algorithm.

Modeling and Control Design for a Computer Controlled Brake System

Raza, H.
Xu, Z.
Ioannou, P.
Yang, B.
1995

In this paper, the problem of modeling and control design of a computer controlled brake system is addressed. A nonlinear model for the brake system is developed by analyzing the input-output data obtained from the test bench. A controller for the brake system is designed by applying feedback linearization techniques along with intuitive modifications to meet the closed loop specifications.

Modeling & Control of Human Actuated Systems

Bae, Sangjae
Han, Sang Min
Moura, Scott
2019

This paper investigates a Cyber-Physical & Human System (CPHS) comprised of a deterministic dynamical system plant model and a human actuator model. Namely, human decisions are stochastic inputs to the plant model. We examine a framework where human decisions cannot be directly controlled, but can be influenced via incentive control signals. Specifically, we use the framework of discrete choice models (DCMs) to capture human decision making, and then design optimal controllers for these human actuated dynamical systems. Existing literature on CPHS often treats human inputs as...

Model Selection and Initial Application of CONTRAM Model for Evaluating In-Vehicle Information Systems

Gardes, Yonnel
Haldors, Bruce
May, Adolf D.
1991

The objectives of this study were to select a traffic assignment and simulation model, apply that model to an integrated freeway/arterial network such as the Smart Corridor in Los Angeles, California, and, using the model, make an initial evaluation of in-vehicle information systems and the applicability of the model.