Life Cycle Cost Model For Transit Bus Fleets, Connor Andrew Jack

Graduate Theses, Dissertations, and Problem Reports

Abstract

Life Cycle Cost Model for Transit Buses

Connor Jack

Transit agencies battle with reducing emissions while trying to be cost effective. In 2009, the Transit Cooperative Research Program Report (TCRP) 132 presented a life cycle cost model to aid in procurement evaluation [1]. The model is a life cycle cost analysis tool to estimate the overall costs of procurement and compare alternative technologies [2]. The model concentrates on pre-2007 conventional diesel, diesel hybrid with first generation diesel particulate filters, gasoline hybrid, and compressed natural gas transit buses.

The objectives of this work are to implement battery electric technology into …

Minimizing Run Time Of Finite Element Analyses: Applications In Conformable Cng Tank Modeling, Paul M. Roehm

Dissertations, Master's Theses and Master's Reports

REL Inc. has proposed a CNG tank that deviates from typical cylindrical storage methods. The goal of REL working with Michigan Tech is to minimize mass and meet NGV2 safety standards for pressure and drop testing for this tank.

The model has undulated outer surfaces and Schwarz P-surface internal geometry. To accurately mesh this, a small element size is necessary; this creates a model with millions of elements. In explicit analyses, this requires a large amount of computational resources to run.

This report focuses on methods to reduce model run time without reducing accuracy. Methods covered include creating symmetric building …

Analysis Of Flow Of Compressed Natural Gas Through A Fuel Injector, Erin E. Eldridge

Honors College

The purpose of this thesis is to discuss the determination of the mass flow rate of compressed natural gas through a Delphi Multec CNG Injector. Three methods are used to find the mass flow rates at various pressures. First, SolidWorks Flow Simulation is employed to calculate the mass flow rate with computational fluid dynamics. An analytical solution to the problem is also presented. Finally, experimental results from a previous year’s Capstone team are presented. Fuel flow curves are provided to compare the results from each methodology. The results from the SolidWorks Flow Simulation and analytical calculation agree at the extrema …