Transcription of AN INTRODUCTION TO FREQUENCY RESPONSE FUNCTIONS …
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AN INTRODUCTION TO FREQUENCY RESPONSE FUNCTIONS …
1AN INTRODUCTION TO FREQUENCY RESPONSE FUNCTIONSBy Tom IrvineEmail: 11, 2000_____IntroductionThe purpose of this report is to discuss FREQUENCY RESPONSE FUNCTIONS . These functionsare used in vibration analysis and modal testing. The purpose of modal testing is toidentify the natural frequencies, damping ratios, and mode shapes of a FrequenciesBridges, aircraft wings, machine tools, and all other physical structures have naturalfrequencies. A natural FREQUENCY is the FREQUENCY at which the structure would oscillateif it were disturbed from its rest position and then allowed to vibrate freely.
2 The natural frequencies can be calculated via analytical methods during the design stage. The frequencies may also be measured after the structure, or a prototype, is built.
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