NDLI: Apparatus and method for determining the mass density of a filament (Document No: 19950014200)

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Apparatus and method for determining the mass density of a filament (Document No: 19950014200)

Content Provider	NASA Technical Reports Server (NTRS)
Organization	The National Aeronautics and Space Administration (NASA)
Copyright Year	1994
Description	A method and apparatus for determining the mass density of a moving filament is provided. The method includes the steps of providing a filament across two supports, tensioning the filament, inducing a vibration into the filament segment between the supports, reinforcing the vibration using an amplified feedback signal, detecting the vibrational frequency data, processing the data using a fast-fourier transform analysis, and then displaying the frequency. The use of the feedback signal results in a self-tuning resonant loop. Open loop versions may also be used. The apparatus includes a base supporting a fixed support and a transducer which in turn supports a moveable support. The transducer vibrates the moveable support transversely to the direction of travel of the filament, thereby inducing a transverse vibrational mode. The output of the transducer is amplified and used to drive a second amplifier to produce a self-tuning resonant loop. In the open loop version a signal generator is used to drive the transducer through a frequency range, during which the amplitude peak is identified.
File Size	364678
File Format	PDF
Alternate Webpage(s)	http://www.archive.org/details/nasa_techdoc_19950014200
Archival Resource Key	ark:/13960/t87h2g631
Language	English
Publisher Date	1994-09-29
Publisher Institution	Langley Research Center
Access Restriction	Open
Subject Keyword	Aerodynamic Interference Angular Resolution Noise Intensity Turbofans Wind Tunnel Walls Anechoic Chambers Background Noise Holders Low Speed Wind Tunnels Microphones Noise Measurement Noise Reduction Acoustic Properties Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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