Joseph Todd Messer

Washington, District of Columbia, United States Contact Info
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    Brand Design, Graphic Design, Illustration, Logo Design, UX Research, User Experience Design (UED), Web Design, Web Development, Custom Software Development, and User Experience Writing

About

I am the Director of UX for a federal contracting company currently working as Program…

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Volunteer Experience

  • Creative Director

    Aplastic Anemia & MDS International Foundation

    - 4 years 3 months

    Health

    I help this small nonprofit with all of its UI and graphic design.
    Most recently I redesigned their logo, website and began working through all their print material.

Publications

  • Measurement Delays and Modal Analysis for a Heavy Duty Transportable Emissions Testing Laboratory

    http://papers.sae.org/950218/

    Concern over atmospheric pollution has led to the development of testing procedures to evaluate the hydrocarbon, carbon dioxide, carbon monoxide and oxides of nitrogen emissions from internal combustion engines. In order to perform emissions testing on vehicles, a chassis dynamometer capable of simulating expected driving conditions must be employed. West Virginia University has developed a Heavy Duty Transportable Emissions Testing Laboratory to perform chassis testing on trucks and buses…

    Concern over atmospheric pollution has led to the development of testing procedures to evaluate the hydrocarbon, carbon dioxide, carbon monoxide and oxides of nitrogen emissions from internal combustion engines. In order to perform emissions testing on vehicles, a chassis dynamometer capable of simulating expected driving conditions must be employed. West Virginia University has developed a Heavy Duty Transportable Emissions Testing Laboratory to perform chassis testing on trucks and buses. Emissions from the vehicle are monitored and recorded over the duration of a testing schedule. Usually the vehicle emissions from the whole test are reported as mass of emissions per unit distance driven. However, there is interest in relating the instantaneous emissions to the immediate conditions at specific points in the test, and in determining the emissions for discrete segments of the test (modal analysis). Unfortunately, there is significant delay between the point in time when the vehicle experiences a certain operating condition, and the point in time at which the emissions related to that operating condition are measured and recorded. This measurement delay results from a combination of the time due to the transport of exhaust gases from the engine to the appropriate gas analyzers and the response time of the analyzers. During emissions testing, the vehicle exhaust is connected via insulated pipe to the intake of a full size dilution tunnel where fresh air is mixed with the exhaust stream to simulate atmospheric conditions. Sample probes withdraw diluted exhaust gas from the tunnel and this gas is then transported to the gas analyzers via heated lines.

    Each of these components leads to measurement delays, and the sum of these delays should reflect the shift between expected and measured emissions transients. A mathematical model was developed using analyzer response times and appropriate fluid flow and heat transfer equations to predict the time delay between an engine

    Other authors
    • Clark, N., and Lyons, D
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