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• W1567004126 abstract "Life cycle assessment (LCA) is one methodology for assessing a product’s impact on the environment. LCA has grown in popularity recently as consumers and governments request more information concerning the environmental consequences of goods and services. In many cases, however, carrying out a complete LCA is prohibitively expensive, demanding large investments of time and money to collect and analyze data. This thesis aims to address the complexity of LCA by highlighting important product parameters, thereby guiding data collection. LCA streamlining is the process of reducing the necessary e↵ort to produce acceptable analyses. Many methods of LCA streamlining are unfortunately vague and rely on engineering intuition. While they can be e↵ective, the reduction in e↵ort is often accompanied by a commensurate increase in the uncertainty of the results. One nascent streamlining method aims to reduce uncertainty by generating random simulations of the target product’s environmental impact. In these random Monte Carlo simulations the product’s attributes are varied, producing a range of impacts. Parameters that contribute significantly to the uncertainty of the overall impact are targeted for resolution. To resolve a parameter, data must be collected to more precisely define its value. This research project performs a streamlined LCA case study in collaboration with a diesel engine manufacturer. A specific engine is selected and a complex model of its production and manufacturing energy use is created. The model, consisting of 184 parameters, is then sampled randomly to determine key parameters for resolution. Parameters are resolved progressively and the resulting decrease in uncertainty is examined. The primary metric for evaluating model uncertainty is False Error Rate (FSR), defined here as the confusion between two engines that di↵er in energy use by 10%. Initially the FSR is 21%, dropping to 6.1% after 20 parameters are resolved, and stabilizing at 5.8% after 39 parameters are resolved. The case study illustrates that, if properly planned, a streamlined LCA can be performed that achieves desired resolution while vastly reducing the data collection burden. Thesis Supervisor: Timothy G. Gutowski Title: Professor of Mechanical Engineering 3" @default.
• W1567004126 created "2016-06-24" @default.
• W1567004126 creator A5036546238 @default.
• W1567004126 date "2013-01-01" @default.
• W1567004126 modified "2023-09-24" @default.
• W1567004126 title "Iterative uncertainty reduction via Monte Carlo simulation : a streamlined life cycle assessment case study" @default.
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