Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.
根据变换方程与约束方程显含时间的等价,
了定常约束与定常
统判据的等同表述。
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In fact, the problem with relativity wasn't that it involved a lot of differential equations, Lorentz transformations, and other complicated mathematics (though it did-even Einstein needed help with some of it), but that it was just so thoroughly nonintuitive.
实际上,相对论的问题并在于它涉及许多微分方程、洛伦兹变换和其他复杂的数学(虽然它确实涉及——有的方面连爱因斯坦也需要别人帮忙),而是在于它
是凭
觉所能完全搞懂的。
Using the corrected reaction coefficient of the foundation bed, the differential equation of tunnel deformation was established, and the solution matrix of the longitudinal displacement of the tunnel was obtained by using the finite difference method.
利用修正后的基床反作用系数,建立隧道变形微分方程,采用有限差分法得到隧道纵向位移的解矩阵。
First, the additional load at the existing tunnel position caused by ground overloading is calculated; then, the calculated external load is applied to the existing tunnel, and the differential equation of longitudinal deformation of the existing tunnel is established.
首先,计算地面超载引起的有隧道位置的附加荷载;然后,将计算出的外荷载施加到既有隧道中,建立既有隧道纵向变形微分方程。