"Randomdec" is the name the author gave to the random decrement technique which he invented in 1968 while working at NASA/Ames on transonic buffeting of rocket launch vehicles. The book shows how this was first done with simple hand calculations and later with special purpose computers and finally with general purpose computers. Randomdec is a fast converging method for extracting meaningful information from random data. When applied to the random output of a transducer placed on an object which is subjected to random excitation, a signature is obtained which can be used to measure damping...