The C.I.T. Mark II electric analog type response spectrum analyzer for earthquake excitation studies
Abstract
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 The new model spectrum analyzer herein described has superseded the model discussed in this preceding report.
Additional Information
revision of a report originally issued in 1954, and deposited in this archiveFiles
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Additional details
- Eprint ID
- 26479
- Resolver ID
- CaltechEERL:1960.EERL.1960.001
- Created
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2008-02-19Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Earthquake Engineering Research Laboratory