Abstract
This chapter discusses the power spectral methods of analysis and their application to problems in airplane dynamics. The field of dynamics is largely concerned with the response of systems to various types of disturbances. A number of techniques exist for the analysis of certain types of disturbances, and these have found wide application in many fields. The use of responses to step inputs, pulse inputs, and sinusoidal inputs is already familiar and useful in many aeronautical areas. The chapter describes classical techniques for response determination to arbitrary disturbances. It discusses the concepts of power spectra and the relations between the spectra and time-history characteristics. The chapter highlights the practical problem of measuring power spectra from finite data.
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