一种新型的时域动力无穷单元

A NEW INFINITE DYNAMIC ELEMENT IN TIME DOMAIN

针对频域动力无穷元不便与时域有限元结合的缺陷,采用时域的波传函数,推导出一种新型的时域动力无穷单元,并采用UPFs工具对ANSYS进行二次开发,将其嵌入到ANSYS当中。然后采用经典算例对所提出的新型动力无穷单元进行验证,并将其结果与远置边界、粘性边界、粘弹性边界的结果进行比较。验证结果表明,所提出的新型时域动力无穷单元是成功的,并可方便地实现与时域的有限单元结合。

Considering the inconvenience of combining infinite dynamic elements in frequency domain with those in time domain, a new infinite dynamic element is proposed based on the wave propagation function in time domain. The new infinite dynamic element in time domain is developed in ANSYS with the UPFs tool and registered as an element of ANSYS. At last, the efficiency of the new infinite dynamic element in time domain is verified with a typical example by comparing its results with those produced by far, viscous and elastic-viscous artificial boundary conditions. The verification shows that the new infinite dynamic element proposed in time domain is successful and can be combined with finite element in time domain easily.