Method and apparatus for measuring the damping characteristics of a structure
Abstract
Abstract APPARATUS FOR MEASURING THE DAMPING CHARACTERICS OF A STRUCTURE OR SYSTEM DURING EXCITATION BY RANDOM FORCES OR INFLUENCES. THE "RANDOMDEC" APPARATUS IS COMPRISED OF AT LEAST TWO PARALLEL SAMPLING CIRCUITS WHICH PERFORM TIME SEQENTIAL SAMPLING OPERATIONS ON PREDETERMINED PORTIONS OF A GIVEN INPUT SIGNAL. THE CORRESPONDING OUTPUTS OF EACH SAMPLING CIRCUIT ARE THAN ADDED TOGETHER AT A PLURALITY OF OUTPUT TERMINALS. FROM EACH OUTPUT TERMINAL A SAMPLING TRANSIENT INDICATIVE OF A POINT ON THE DAMPING CHARACTERISTIC OF THE STRUCTURE CAN BE OBTAINED. IN ACCORDANCE WITH THE INVENTION, A SYSTEM IS ALSO DISCLOSED UTILIZING THIS APPARATUS TO PROVIDE AN ONTHE-LINE DAMPING RATIO AND PERIOD DETECTION AND DISPLAY APPARATUS INCLUDING MEANS FOR INSTANTANEOUSLY OBSERVING THE DAMPING CHARACTERISTICS OF THE MONITORED STRUCTURE AND PROVIDING AN OUTPUT CONTROL SIGNAL WHICH CAN BE USED TO INFLUENCE THE CHARACTERISTICS OF THE STRUCTURE OR THE FORCES APPLIED THERETO IN A SELECTED MANNER.
Inventors
- 👤 Henry A Cole Jr
Bibliographic Details
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