Frequency-Aimed Structural Optimal Design of Stiffened Plate

Abstract:

Optimal structural design of stiffened plate structure with multi order modal frequencies objective is discussed. It is a structural reverse design problem for the first several order modal frequencies to reach a set of given value. A new method based on bi-directional evolutionary structural optimization (BESO) and size optimization is presented. To solve the porous and irregular shape problem in the optimized structure, a regular shaped grid-like frame structure optimization model is established. The bars in the frame structure are regarded as basic unites of structure modification. The bars’ sensitivity is discussed, and applied to optimization process based on frequency sensitivity. The structural optimal design process can be described as follows: the frequencies are used as the target, the volume is considered as constraint, adjacent sensitivity redistribution method is adopted to suppress numerical instability. Then size optimization method is adopted to conduct detailed design. Finally this method is applied to a stiffened plate structure. Results show that the proposed approach is feasible to achieve given multi order modal frequencies. The optimized structure consists of regular bars, so a clear structure is obtained.

• Periodical: Advanced Materials Research (Volumes 452-453)
• Pages: 1475-1480
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.452-453.1475
• Online since: January 2012
• Authors: Da Hai Mi, Rui Yang, Liang Zhou, Yang Liu, Dong Ming Guo
• Keywords: BESO, Frequency Optimization, Stiffened Plate, Structural Design

References

[1] Q. L. Yun: Wind Tunnel Testing (National Defense Industry Press, Beijing 2000).

[2] Y. M. Xie, G. P. Steven: Computers and Structures. J. Vol. 49 (5)(1993), p.885.

[3] Y. M. Xie, G. P. Steven: Computers & Structures. J. Vol. 58 (6)(1999), p.1067.

[4] O. M. Querin, V. Young, G. P. Steven: Computer methods in applied mechanics and engineering. J. Vol. 189(2000), p.559.

[5] X. Huang, Y. M. Xie, M. C. BURRY: Advances in Structural Engineering. J. Vol. 10(2007), p.727.

[6] Zh Z Guo: Doctoral thesis. Chinese Academy of Engineering Physics, (2008).

[7] X. Y. Yang: Master thesis. Dalian University of Technology, (2009).

[8] M. P. Bendsoe, O. Sigmund: Topology Optimization: Theory, Methods and Applications (Springer Verlag, Germany 2003).

[9] Z. D. Xu, L. W. Ma: Structural Dynamics (Science Press, Beijing 2007).

[10] R. A. Lopes, F. V. Stump, E. Carlos and N. Silva, in: 6th World Congress of Structural and Multidisciplinary Optimization， Rio de Janeiro, Brazil, 2005, p.5.