Experimental measurement of the mechanical impedance of a cantilever beam.
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Authors
Hoover, Richard M.
Subjects
Advisors
Gatcombe, Ernest K.
Date of Issue
1962
Date
1962
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
In order to gain facility with mechanical impedance
methods, and to determine the feasibility of using
theoretical impedance functions in the design of machinery
foundations, the mechanical impedance of a tip-driven cantilever beam of uniform cross section was determined experimentally.
This experimental impedance function is compared
with a theoretical impedance function. Correlation
between the two impedance functions is good at the first
resonant and the first antiresonant frequencies. Attachment
of the means of driving the cantilever beam and
measuring Its resulting motion appears to modify the
nature of the structure and its response to an exciting
force. The accuracy of the experimental impedance
function is limited by the accuracy of the phase angle
determinations. A clamping jig for achieving experimentally
the clamped end condition is described. The
validity of the assumptions of linearity and negligible
damping is established qualitatively. A method of
checking theoretical relations, experimental procedures
and proper functioning of instruments is also described.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.