The dynamic responses on critical time can be worked out using Newmark method, and the adjoint vector can be worked out using direct method (the solving of responsesand adjoint vector is separate), then we can get the sensitivity on critical time.

• 可以利用Newmark法求出各时间离散点的动力响应，再利用直接法求解各时间离散点的伴随向量（两者的求解是分离的），从而可得到各临界时间点上的灵敏度。