A mesh partition based explicit integration method for dynamic structure FEA is proposed in this article. With this method, the whole finite element mesh is partitioned into several zones according to the elements increment feature size, and then variable time increments are applied to the mesh zones for explicit integration while the parameter transfer and interpolation is performed over the interfaces to ensure the continuity. This method has the capability of boost the analysis efficiency without much precision loss to the analysis results of interested zones, which is proven by some 2D analysis examples.
An improved algorithm of the discrete orthogonal polynomial to identify the modal parameters is stated and a modal analysis system is designed and developed by object-oriented programming language Visual C++ here. Then proper experiment device is setup to collect signal data. Finally, compare the algorithm’s result with the ME’scopeVES’s and exam the algorithm’s correctness.
Data type recovery is required for in-depth analysis of binary code. In this paper, a constraint-based type recovery algorithm(CBTR) was studied first. The CBTR algorithm does not make use of control flow information in the type recovery process. To make up for CBTR's deficiency, an enhanced data flow based type recovery algorithm(DBTR) is proposed. DBTR builds control flow graph and data flow graph upon the disassembly of binary code. Empirical study shows that with dataflow information, DBTR is superior to CBTR in the precision of type recovery.
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