Method of analyzing dynamic data characterized by a time-varying frequency spectrum
A. D. Brenza · NASA Technical Reports Server (NASA) · 1967
Many research areas are generating dynamic data whose frequency spectrum changes as a function of time, as is characterized by the data generated in the rocket-engine combustion instability program.specific times during the test must be determined.these data were unsatisfactory; therefore, a different reduction method was required.A system was developed that produces a series of time history records from which the instantaneous frequency spectrum is determined., From these data the instantaneous frequency spectrum at Previous methods used in reducing