但这一偏微分方程不能直接积分，所以通常用纳维法、瑞利-里兹法、有限差分方法等方法求解。
But this partial differential equation can not be directly integral, so usually use Navier method, Rayleigh Ritz method and finite difference method and other methods.
双积分是一种常用的转换技术，具有精度高，抗干扰能力强等优点。
Double integral is a kind of common conversion technology, with high precision, strong anti-jamming capability, etc.
与传统的有限单元法和常用的时间积分法相比，时空有限元在精度和稳定性方面具有一定的优越性。
Compare to the conventional finite element method and common-used time integration methods, the space-time finite element method has some advantages in precision and stability.
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