Details:

Creators:
Wayson, Roger L. ; Kim, Brian
Wayson, Roger L. ; Kim, Brian Less -
Corporate Creators:
University of Central Florida. Dept. of Civil and Environmental Engineering
Subject/TRT Terms:
[+]
Acceleration (Mechanics) Air Quality Emissions Testing Exhaust Gases Ground Vehicles Polluting Gases Simulation
Resource Type:
Tech Report
Geographical Coverage:
United States
Corporate Publisher:
University of South Florida. Dept. of Civil and Environmental Engineering
NTL Classification:
AGR-IMPACTS-Environment;NTL-ENERGY AND ENVIRONMENT-Air Quality;NTL-ENERGY AND ENVIRONMENT-Environment Impacts;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
Abstract:
The Environmental Protection Agency’s (EPA’s) recommended model, MOBILE5a, has been

used extensively to predict emission factors based on average speeds for each fleet type.

Because average speeds are not appropriate in modeling intersections or other scenarios

involving intermittent travel, emission factors that are specific for vehicle operating modes

(acceleration, deceleration, free-flow, and idle) have been studied in the past. Several models

have been developed that use the concept of acceleration-speed products to serve as input

variables to determine multipliers that can be used to modify constant speed emission factors.

Although relatively simplistic, this process provides results that are considered more accurate

than constant speed emission factors. The Comprehensive Modal Emissions Model (CMEM)

developed under sponsorship by the National Cooperative Highway Research Program

(NCHRP) is based on a parameterized physical approach. While anticipated to be more

accurate, the input requirements to the model are necessarily more complicated.

This paper presents a new modal emissions model based on existing emissions data from the

early 1990s revision efforts of the Federal Test Procedure (FTP). The model updates the older

acceleration-speed product models that were based on data from the 1970s. Using secondby-

second emissions data, several different forms of the modeling equations were developed

and statistically analyzed for predicting multiplying factors for CO. A goal in developing this

model is to serve as a comparison basis for the NCHRP model. The second and more

important goal is to use the model as part of a microscale traffic simulation model that predicts air quality near roadways.


Format:
PDF
Collection(s):
Volpe
Main Document Checksum:
[+]
urn:sha256:35f877fe97d753a7038fd3264df31faf8126219abb0fee218352b5f50742dbb2
Download URL:
https://rosap.ntl.bts.gov/view/dot/9819/dot_9819_DS1.pdf
File Type:

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