一种工程实用的数值积分方法

A NUMERICAL INTEGRATION METHOD FOR STRUCTURAL ANALYSIS

  • 摘要: 在实际工程结构动力反应分析中,往往由于结构型式十分复杂,常用的两种直接积分方法,即显式积分方法和隐式积分方法,在使用中都存在着一定的局限性,如何将这两种积分方法合理有效地结合起来,是一个十分有意义的研究课题.针对实际工程问题中整体结构计算时间步长的选择往往受局部区域的材料特性、尺寸大小等因素影响的这一现象,提出了一种对结构局部区域进行隐式积分、对其余区域进行显式积分的工程实用的显隐式数值积分方法,这种积分格式相对于显式积分格式而言,能显著提高整体结构的计算速度.最后采用三个数值计算实例对这一方法进行验证.

     

    Abstract: In the dynamic response analysis of practical engineering structures, there are two commonly used direct integration methods, i.e., explicit integration method and implicit integration method. Both have some limitations, especially when structures are complex. How to combine them rationally and effectively is a very interesting topic. In this paper, an explicit-implicit integration method is put forward, in which implicit integration is used in local region of structure, and explicit integration is used in other regions. Because the time step is often influenced by such factors as material characteristics, size of local region, the proposed method can effectively overcome the shortcomings of the conventional explicit or implicit integration method and enhance calculation speed. Three numerical examples are given to demonstrate the proposed method.

     

/

返回文章
返回