The Shock and Vibträon Digest is a monthly publication of the Shock and Vibration Information Center. The god of the Digest is to provide efficient transfer of sound, shock, and vibration technology among researchers and practicing engineers. Subjective and objective analyses of the literature ate provided along with news and editorial material. News items and articles to be considered for publication should be submitted to:

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The vibratory responses of large fan systems continues to be a problem at numerous power plants. This research study has provided further insight concerning methods of analyzing and predicting such responses. Refinement and verification of the total system dynamic analysis procedures was accomplished in the investigation. The equivalencing of experimental measurements taken on existing fan systems with theoretical response results provided one of the bases for this effort. Five large, induced-diaft fans and two smaller, primary air fans were utilized for the comparisons, good agreement being obtained in all cases.