Application Study On Domain Decomposition Techique In Strength Analysis Of Aircraft Structures

With the steady development of domestic aviation industry, especially the further research of commercial aircraft engineering, all kinds of large-scale and complex structures are encountered. These structures are not only with huge dimensions,but also with more and more complicated conditions, even related to kinds of geometrical, material, contact nonlinearity problems. For these problems,traditional finite element method running on single PC cann't satisfy the need of engineering practice. So it is in urgent need to adopt new methods. The technology of parallel computing is introduced into finite element analysis to increase the scale of structure analysis, accelerate computing speed, and facilitate the application of finite element in large-scale and complex structures.With the development of the technology of computer and network,the cluster composed of common PC provides a platform for parallel computing. Based on this, making use of great ability of preprocessing in MSC.Patran and nonlinear solving in MSC.Marc, together with one of the most popular domain decomposition methods in the field of engineering——METIS and several common PCs at Civil Aircraft Structure and Strength Comprehensive Laboratory of Shanghai Jiao Tong University, Set up a platform for parallel finite element computing based on domain decomposition. Detailed configuration and maintenance method of the platform is provided.Employing this computing platform, the strength calculation of several typical linear elastic,geometrical, material, contact nonlinear problems and a whole aircraft model with about 2.6 million degrees of freedom (DOF) were realized. Analyze and summarize the effect of different operating system, decomposition methods and numbers of subdomain on computing time and efficiency to offer a reference and cost-effective solution for solving large-scale and complex finite element model.