在现代设计中设计原始信号的分析愈来愈细,刚性运动体的弹性信号是客观存在,但在传统设计中无人问津。弹性信号的考虑与分析使设计更接近真值。本文只是简介原理,实际上弹性信号是随机的,如何进一步探讨这一随机信号,以便使设计更符合实际,这是解决柔性设计问题中的重要一环。“柔性”就是指要考虑变化的信号,我们希望学术界在这方面有更多的研究。 In the modern design, the original signal analysis is more and more detailed. The elastic signal of the rigid body is an objective one, but nobody cares about the traditional design. Consideration and analysis of elastic signals make the design closer to true value. This article is only an introduction to the principle. In fact, the elastic signal is random. How to further explore this stochastic signal to make the design more practical is an important part of the solution to the problem of flexible design. “Flexibility” refers to the signal of changes to be considered. We hope that there will be more academic research in this area.