Design Manual for Vertical Gusts Based on Power Spectral Techniques
Final rept. 2 Jan 1969-1 Jul 1970
AERONAUTICAL RESEARCH ASSOCIATES OF PRINCETON INC NJ
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Recommended procedures, based on power spectral methods, are given for the design of aircraft for vertical atmospheric turbulence encounter. Four procedures are outlined. The first is a direct preliminary design type, based on specified rigid body results. The second is more detailed and makes use of composite response values, computed either from the rigid body results, or by specific frequency response analysis. A third procedure is based on comparison with a previous successful design. In the fourth procedure specific loads exceedance curves are derived in accordance with assumed missions. Recommended gust intensity values, proportion of time in turbulence, and scale values are given. For ease in application, detailed step-by-step procedures are listed throughout the manual. The philosophy and basis for deriving the recommended design values are reviewed in part. Special sections are included throughout which summarize the basic equations that apply to gust analysis, give the means for treating structural interaction effects, and show how the problem of nonuniform spanwise gusts is treated. Appendices are included which give useful conversion and data charts, and which review various means for establishing the frequency response function.