NDLI: Stress Wave Measurements in an Electromagnetic Launcher

Content Provider	IEEE Xplore Digital Library
Author	Johnson, A.J. Haran, T. Moon, F.C. Robinson, W.
Copyright Year	2008
Description	Author affiliation: Sch. of Appl. & Eng. Phys., Cornell Univ., Cornell, NY (Johnson, A.J.)
Abstract	This paper discusses strain measurements that were conducted on the electromagnetic rail launcher at the Georgia Institute of Technology. The dynamic strain in the rails of the launcher was measured using fiber Bragg grating strain sensors with an interrogation system developed by micron optics. The fiber optic sensors are immune to the large pulsed electromagnetic fields in the bore of the launcher. The immunity of this system to electromagnetic interference allowed for dynamic strain measurements to be made during launch. These measurements show changes in the dynamic strain that are indicative of a critical velocity of the rails. These changes include wave radiation, wave reflection and strain amplification above the critical velocity. The magnitude of the stress waves are large enough for plastic deformation of the rails to occur. This plastic deformation could directly affect the lifetime of the rails in the electromagnetic launcher. The apparent critical velocity seen in these experiments is lower than the value from the Bernoulli-Euler beam theory. This is believed to be caused by a combination of the nonlinear load-deflection curve and effective mass of the containment. In addition to these phenomena, jerk effect waves and asymmetries between the two different rails were also observed.
Starting Page	1
Ending Page	6
File Size	1366314
Page Count	6
File Format	PDF
ISBN	9781424418329
DOI	10.1109/ELT.2008.77
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-10
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Rails Maximum likelihood detection Nonlinear filters Strain measurement Sensors Optical fiber filters Strain
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in