Affiliation:
1. Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, MS 0219, Blacksburg, VA 24061
2. Department of Aerospace Engineering and Mechanics, The University of Alabama, Tuscaloosa, AL 35487-0280
Abstract
Abstract
A variety of aerospace structures, such as missiles, spacecraft, aircraft, and helicopters, can be modeled as unrestrained flexible bodies. The state equations of motion of such systems tend to be quite involved. Because some of these formulations were carried out decades ago when computers were inadequate, the emphasis was on analytical solutions. This, in turn, prompted some investigators to simplify the formulations beyond all reasons, a practice continuing to this date. In particular, the concept of mean axes has often been used without regard to the negative implications. The allure of the mean axes lies in the fact that in some cases they can help decouple the system inertially. Whereas in the case of some space structures this may mean complete decoupling, in the case of missiles, aircraft, and helicopters the systems remain coupled through the aerodynamic forces. In fact, in the latter case the use of mean axes only complicates matters. With the development of powerful computers and software capable of producing numerical solutions to very complex problems, such as MATLAB and MATHEMATICA, there is no compelling reason to insist on closed-form solutions, particularly when undue simplifications can lead to erroneous results.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference14 articles.
1. On the High-Spin Motion of a Satellite Containing Elastic Parts;Meirovitch;J. Spacecr. Rockets
2. Floating Reference Frames for Flexible Spacecraft;Canavin;J. Spacecr. Rockets
3. Dusto, A. R., Brune, G. W., Dornfield, G. M., Mercer, J. E., Pilet, S. C.Rubbert, P. E., Schwanz, R. C., Smutney, P., Tinoco, E. N., and Weber, J. A., 1974, “A Method for Predicting the Stability Characteristics of an Elastic Airplane,” Vol. 1-FLEXSTAB Theoretical Description,” NASA CR-114712.
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献