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dc.contributor.advisorDeVoe, Donen_US
dc.contributor.authorLiu, Jingen_US
dc.date.accessioned2005-08-03T13:30:48Z
dc.date.available2005-08-03T13:30:48Z
dc.date.issued2005-03-01en_US
dc.identifier.urihttp://hdl.handle.net/1903/2350
dc.description.abstractMicromechanical sequential-leaf time delay mechanisms based on SOI/DRIE technology have been designed, fabricated, and characterized. The devices were designed as elements of a larger fuzing system for rifled munitions, in which a passive timing mechanism triggers at a predetermined rotational speed, followed by a desired delay time before the next element of the munition fuzing train is activated. Analytical models for the micromechanical timing mechanisms have been developed and a variety of designs was simulated from the linear and nonlinear models, and using dynamics simulation software. Fabricated mechanism arrays designed to initiate switching at centripetal accelerations from 44 to 263 g were characterized using a high-speed camera, with delay times of between 0.67 and 0.95 ms achieved for single elements within the arrays. Measured delay times and switching accelerations follow predicted trends based on analytical and numerical models. Runaway escapement mechanism was coupled with the sequential-leaf time delay mechanisms to increase the delay time of each mechanism element. Mechanism switching at 2,000 g have been designed and simulated. The predicted delay time of each mechanism element was approximately doubled with the coupled runaway escapement mechanism. Two types of locking mechanisms were developed to increase reliability of operation of the sequential-leaf time delay mechanisms. The fish-bone type locking mechanism had been successfully demonstrated. A generic testing method for rotational dynamics that could image small displacement of object with high-speed off axis rotation was developed, which demonstrated for the first time of real time monitoring for rotational time delay mechanism. Image processing technology was used to improve image quality of high-speed images and extend the capability of high-speed camera to adapt to high rotation speed tests and to assist in post image analyses.en_US
dc.format.extent7410918 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.titleDesign, Fabrication, and Testing of Time Delay Micromechanisms for Fuzing Systemsen_US
dc.typeDissertationen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentMechanical Engineeringen_US
dc.subject.pqcontrolledEngineering, Mechanicalen_US
dc.subject.pquncontrolledMEMSen_US
dc.subject.pquncontrolledTime Delayen_US
dc.subject.pquncontrolledFuzeen_US
dc.subject.pquncontrolledMicromechanismen_US


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