针对软化结构的负刚度问题，提出了一种多维虚加弹簧法。
The multi-assumed-spring method is developed to solve the negative stiffness problem of softening structures.
提出了基于弹簧法的两点改进，以解决边界发生大变形时的非结构网格变形问题。
The article presents two improvements on the spring analogy for unstructured mesh deformation in engineering applications in which large boundary motions are encountered.
为了提高弹簧法的计算效率，引入背景网格和直接插值方法，提出了弹簧-插值法。
The spring-interpolation approach is proposed to improve the efficiency of the spring ana-logy.
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