Rotary Wing Structural Dynamics and Aeroelasticity, Second Edition

Chapter 18: Concluding Thoughts

18.1 Key Historical Milestones

This text was written in part by gleaning many of the contributions of other researchers and dynamists. A complete perspective of all significant contributions in the field, however, would surely create information overload and obscure those contributions that can truly be called seminal, and without which this text would have been impossible to write. These contributions are briefly described and presented in approximate chronological order.

18.1.1 High-Level Languages

The first high-level language to be created was FORTRAN, invented by John Backus and released commercially in 1957. This language allowed the direct usage of actual syntactical formulas and human sounding words. This freed the dynamist not only to formulate his equations, but also to combine the definition of the dynamic problem along with the mathematical solution to produce engineering relevant results. The use of high-level languages spawned the many (at times quite comprehensive) analyses that constitute the present literature of this technology. Following the success of FORTRAN, other high-level languages that emerged were Ada, Algol, BASIC, COBOL, C, C++, LISP, Pascal, PL-1, and Prolog.

18.1.2 Early Key Analyses

The complete literature of rotary wing structural dynamics and aeroelastic analyses is now well beyond what is presentable in any one book's bibliography. Indeed, many well-formulated contributions currently exist and more continue to find their way into the literature. However, two analyses especially, that addressed actual catastrophic instabilities observed in full-scale aircraft need to be put into historical perspective: ground resonance and propeller-nacelle flutter. The basic dynamic equations describing...

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