Mechanical Engineering Faculty Research
Title
Mass Point Leak Rate Technique with Uncertainty Analysis
Document Type
Article
Publication Date
Spring 4-2014
Abstract
The mass point leak rate technique is often the methodology of choice for quantifying leak rates as it uses simple elementary measurements, applies to gas systems of low mass, proves effective for low leak rates, and does not rely on test-gas conversions. In this methodology, a number of instantaneous mass measurements are calculated through samples of volume, pressure, gas composition, and temperature measurements over time. A regression analysis of the corresponding mass-time sample set yields the leak rate of the system. A detailed uncertainty analysis is paramount for a complete, experimental characterization of the leak rate and previously was not fully implemented in the mass point leak rate method. Recent advancements in regression uncertainty analysis by propagation of errors afford the ability to quantify the uncertainty with estimates of covariance in the regression results. The mass point leak rate technique with the associated detailed measurement uncertainty analysis offers the ability to quantify both the leak rate and the uncertainty associated with the leak rate value. Detailed herein is the development of the methodology and a detailed uncertainty analysis that includes both precision (repeatability) and bias (systematic) error. Alternative leak rate methods are also discussed for comparison purposes. An example in the methodology is presented.
Publication Title
Research in Nondestructive Evaluation
Volume
25
Issue
2
First Page
125
Last Page
149
Recommended Citation
Garafolo, Nicholas G. and Daniels, Christopher C., "Mass Point Leak Rate Technique with Uncertainty Analysis" (2014). Mechanical Engineering Faculty Research. 38.
https://ideaexchange.uakron.edu/mechanical_ideas/38