以欧拉-伯努利梁为模型,推导出基于系统响应梁的模态价值截断准则,其结论可推广到大型柔性火炮系统结构,由于该法考虑了可观性向量、模态增益、结构阻尼系数及模态频率,较简单的频率截断法是一个很大的改进,降阶后的模型能很好地近似原系统性能。最后文章给出一个算例。 Taking Euler-Bernoulli beam as a model, the modal value truncation criterion based on the system response beam is deduced. The conclusion can be extended to the structure of a large flexible gun system. Considering the observability vector, modal gain, structural damping Coefficient and modal frequency, a simpler frequency truncation method is a big improvement, the reduced model can well approximate the original system performance. The last article gives an example.