2021-03-252021-03-252019-04-30http://hdl.handle.net/10919/102838A characteristic of a component having an engineered internal space can be analyzed by recording acoustic signals produced by fluid flow through the internal space at controlled flow rates, and determining one or more acoustic frequencies and acoustic intensities that are indicative of the characteristic of the component. A state and/or a source of the component can be predicted based on the results of such analysis.application/pdfPatenthttp://pimg-fpiw.uspto.gov/fdd/64/743/102/0.pdf14153579B05B12/082B05B15/18G01H13/00G01N29/14G01N29/222G01N29/4454G01N29/46G01H3/08G01H3/1010274364