lec6_7 - MIT OpenCourseWare http:/ocw.mit.edu 1.020 Ecology...

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MIT OpenCourseWare http://ocw.mit.edu 1 .020 Ecology II: Engineering for Sustainability Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Lectures 08_6 & 08_7 Outline: Networks, Traffic Modeling Motivation/Objective Develop a model to compute atmospheric (CO) emissions rates from vehicles on a road network Approach 1. Formulate mathematical description of system (road network: nodes, directed links, paths). 2. Select variables to describe steady-state vehicle movement through the network. Identify unknowns (link flow rates and link travel times ). l x l t 3. Formulate coupled equations that use linear travel-time functions, mass balance conditions, and a user equilibrium condition to relate unknown flows and travel times. 4. Specify network properties, solve equations for unknowns (MATLAB) 5. Relate emissions rate to network variables, examine effect of network properties on emissions Concepts and Definitions: Networks: Represent with nodes, directed links, and paths. Describe connectivity, specify link
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lec6_7 - MIT OpenCourseWare http:/ocw.mit.edu 1.020 Ecology...

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