人工邊界在大型軟件中的應(yīng)用
[Abstract]:Artificial boundary is the artificial boundary introduced to simulate the radiation damping effect of continuous medium when the infinite domain is dealt with in a finite way. It is an unavoidable problem in site seismic response analysis and soil-structure dynamic interaction analysis. Viscous boundary and viscoelastic boundary are most convenient to be used in large general finite element software. In this paper, the application of viscous and viscoelastic boundary in ANSYS and ANSYS/LS-DYNA software is introduced, and its precision is explained. In addition, the method of realizing the transmission boundary with higher precision in ANSYS is also introduced. The main contents of this paper are as follows: 1. The application method of viscous boundary and viscoelastic boundary in ANSYS is introduced in detail. By adding spring element, the intrinsic viscous boundary in LS-DYNA software is improved to viscoelastic boundary. 2. The energy absorption effects of viscous boundary and viscoelastic boundary in solving different problems are compared by a large number of examples. The results show that the viscoelastic boundary is superior to the viscous boundary for two-dimensional and three-dimensional wave source problems. In particular, the viscoelastic boundary solution to drift is obvious. For scattering problems, the accuracy of viscoelastic boundary is higher than that of viscous boundary. In addition, it should be noted that when the scattering problem is analyzed directly by using the viscous boundary in LS-DYNA, if the program's default time step 螖 t is used, the result may appear drift phenomenon. It can be solved by reducing 螖 t or adding spring (that is viscoelastic boundary). This paper introduces the secondary development method of transmission boundary in ANSYS and compares the accuracy of several kinds of boundary by wave source example and scattering example. The results show that the accuracy of the second order transmission boundary is higher than that of viscoelastic boundary and viscous boundary. Finally, the paper summarizes the work and puts forward the contents that need further study in the future.
【學(xué)位授予單位】:蘇州科技學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TU435;TP319
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