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The C.I.T. Mark II electric analog type response spectrum analyzer for earthquake excitation studies

Caughey, Thomas Kirk and Hudson, Donald E. and Powell, R. V. (1960) The C.I.T. Mark II electric analog type response spectrum analyzer for earthquake excitation studies. California Institute of Technology . (Unpublished)

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The design of a response spectrum analyzer for earthquake excitation studies is described. Electric analog techniques are used, with a series inductance, capacitance, and resistance circuit forming a direct analog to the mechanical structure. The circuit arrangement permits a determination of system response for a sequence of periods at constant damping. Provision is made for obtaining zero damping in the circuit. An arbitrary function generator of the variable width film-photoelectric cell type is described. The results obtained with the function generator-spectrum analyzer system for a half-sine wave pulse are compared with the mathematically obtained exact answers for the zero damping case, and the accuracy of the system is shown to be satisfactory. This is a revision of a report originally issued as the "Sixth Technical Report", Office of Naval Research Contract N6 ONR-244, Task Order 25, Project Designation NR-081-095 by the California Institute of Technology dated July, 1954. The new model spectrum analyzer herein described has superseded the model discussed in this preceding report.

Item Type:Report or Paper (Technical Report)
Additional Information:revision of a report originally issued in 1954, and deposited in this archive
Group:Earthquake Engineering Research Laboratory
Record Number:CaltechEERL:1960.EERL.1960.001
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Usage Policy:You are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format.
ID Code:26479
Deposited By: Imported from CaltechEERL
Deposited On:19 Feb 2008
Last Modified:03 Oct 2019 03:15

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