CaltechAUTHORS
  A Caltech Library Service

Comments on: Covariance–Invariant Digital Filtering–A Better Digital Processing Technique for Ground Motion Studies; by J. E. Ehrenberg and E. N. Hernandez

Beck, James L. (1982) Comments on: Covariance–Invariant Digital Filtering–A Better Digital Processing Technique for Ground Motion Studies; by J. E. Ehrenberg and E. N. Hernandez. Bulletin of the Seismological Society of America, 72 (4). pp. 1445-1446. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20121029-101759863

[img]
Preview
PDF - Published Version
See Usage Policy.

95Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20121029-101759863

Abstract

Ehrenberg and Hernandez (1981) have presented a novel recursive digital algorithm for computing the relative displacement of a single degree-of-freedom linear oscillator subjected to a digitized ground motion record. Their stated aim is to achieve an accurate and numerically efficient algorithm which will allow the displacement response spectrum at several oscillator frequencies to be computed in real time by a microprocessor system. They compare their algorithm, the "covariance-invariant filter" with the "bilinear z filter" proposed by Stagner and Hart (1970), and show that the new algorithm gives better accuracy for a given ratio fs/fn, where fs and fn are the sample and oscillator frequencies, respectively, and that the improvement in relative accuracy becomes greater as f~/fn is decreased. Alternatively, for a given accuracy and oscillator frequency, the ground motion can be sampled at a lower rate for their algorithm, thereby ensuring it is more efficient computationally than the bilinear z filter.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://bssa.geoscienceworld.org/content/72/4/1445.full.pdf+htmlPublisherUNSPECIFIED
Additional Information:Copyright © 1982 by the Seismological Society of America. Manuscript received 2 February 1982.
Record Number:CaltechAUTHORS:20121029-101759863
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121029-101759863
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35147
Collection:CaltechAUTHORS
Deposited By: Carmen Nemer-Sirois
Deposited On:29 Oct 2012 21:40
Last Modified:23 Aug 2016 00:15

Repository Staff Only: item control page