Estimation of clearances and impact forces of mechanical systems using vibro-impact response.
Item
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Title
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Estimation of clearances and impact forces of mechanical systems using vibro-impact response.
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Identifier
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AAI9207094
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identifier
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9207094
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Creator
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Lin, Shao-Quan.
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Contributor
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Adviser: Charusheel N. Bapat
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Date
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1991
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Mechanical
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Abstract
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Increasing clearances in many mechanical and industrial systems are closely related to wear. Hence accurate estimation of clearances and impact forces is extremely important in system monitoring and preventive maintenance. Three novel approaches are developed in this dissertation to estimate clearances and impact forces in situ by measuring and using vibro-impact responses of these systems. The describing function approach and the optimization approach are developed for a system under a deterministic excitation and the spectral analysis approach is developed for a system under a random excitation. These three approaches are presented and tested using a single degree of freedom impact oscillator model. Extension of these approaches to a continuous beam-stop system is presented to illustrate the applicability to other complex systems with clearances. Computer programs based on these approaches were developed to estimate clearances and impact forces. Both computer simulated experiments and physical experiments were conducted to test these approaches. The estimates obtained using vibroimpact responses from the mechanical analogues of an impact oscillator and a beam-stop system and from a computer program to simulate an impact oscillator agreed will with actual clearances and impact forces. The effects of input amplitude and frequency, stiffness and clearance size, asymmetry, and damping on estimation of clearances are studied and guidelines are developed for practical use.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
