Designing of minimum mass airframes under several loadings

Abstract

We discuss the features of optimal force transfer in a thin-walled structure and use them to develop a method for defining the distribution of material over the structure elements for minimizing its volume. The suggested method works with one or several external loadings and allows one to determine the optimal structure and to recognize the phenomenon of Razani in which a structure with unequal stresses due to several loadings is more light-weight than a fully- stressed one. Using the developed method, we solved the original Razani problem and applied it for the optimization of the wing structure of a novel hypersonic airplane. It is shown that the determined material distribution is 8.78% lighter than that in a conventionally fully-stressed structure.

About the authors

A. I. Danilin

Samara National Research University

Author for correspondence.
Email: alexdan@ssau.ru
ORCID iD: 0000-0002-8062-9364

Doctor of Science (Engineering), Full Professor of the Department of Aircraft Maintenance

Russian Federation

References

  1. Danilin A.I. Thermodynamic analogy in optimal design of elastic systems. VINITI no. 1230-В88Dep. 1988. 36p. (In Russ.)
  2. Razani R. Behavior of fully stressed design of structures and its relationship to minimum-weight design. AIAA Journal. 1965. V. 3, Iss. 12. P. 2262-2268. doi: 10.2514/3.3355
  3. Danilin A.I. The new optimality criteria for structural design with constraining elastic displacements (non-composite forward swept wing without divergence). Proceedings of the 28th Congress of the International Council of the Aeronautical Sciences, ICAS-2012 (23-28 September, 2012, Brisbane, Australia). V. 3. P. 2275-2280.
  4. Danilin A.I. Energy optimality criteria. Vestnik of the Samara State Aerospace University. 2010. No. 4 (24). P. 74-79. (In Russ.). doi: 10.18287/2541-7533-2010-0-4(24)-74-79

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