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Study on Mathematical Models of Optimization Design for Vibration Rreduction of Hybrid Steel-composite Structure

YANG De-qing;CHEN Jing;GUO Wan-tao;LUO Fang

2011, 31 (3): 24-28. DOI: 10.3969/j.issn.1006-1355-2011.03.006

Abstract （1530）

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Composite materials are widely used in engineering structures for its excellent performances of high damping loss factor, low density, high special strength, high special stiffness etc. Design of composite structure is a combination process of the mechanical performance with the materials design. For quite a few design parameters and complex influencing factors in the process, the optimal design becomes very important. Based on the different vibration reduction evaluation criterions, various structural dynamic optimization design models can be formulated. And their effects for vibration reduction can be quite different. In this paper, a synthetic evaluation method, considering vibration level difference and power flow level difference with structure’s weight or power flow at the evaluation points as objective functions, is presented. Taking the structural dynamic optimization design of the steel-composite mounting as an example, the corresponding mathematical model is established. By introducing multi-island genetic method, the optimization problems are solved. Computational results show that using this model for composite structure optimization, more feasible solution than that using conventional optimization model can be obtained.

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《Power Flow Level Difference Finite Element Analysis》

YANG De-qing;LUO Fang;CHEN Jing

2009, 29 (6): 127-131. DOI: 10.3969/j.issn.1006-1355.2009.06.127

Abstract （2869）

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Formulas on calculating power flow level difference by finite element method are presented for mechanical structures like isolator, beam, plate and combined parts. Through the computations on finite element power flow level difference and vibration level difference for the combined structure, the merits of these two kinds of evaluation methods arecompared. Computational results show that synthetic considering of vibration level difference and power flow level difference in design can get more feasible reduction effects.